September 21, 2026
For Jersey corporate service providers and directors, the economics of a UK property structure may have changed materially over the last few years. Refinancing, higher floating rates and shareholder funding can turn a previously manageable interest bill into a significant UK tax issue.
The question is whether the Corporate Interest Restriction (CIR) rules apply. Although the regime is often associated with large UK-headed groups, it can affect offshore groups, including Jersey structures with UK property businesses, if their net UK tax-interest expense exceeds the relevant threshold, potentially restricting deductions that would otherwise be available in computing UK taxable profits.
This is not something to leave until the tax return is being prepared. The answer will depend on the group’s make-up, its funding terms, the available accounts and, in some cases, elections that must be made within set time limits. For directors, early identification is usually much easier than retrospective repair.
The CIR rules are designed to limit a group’s corporation-tax deductions for interest and similar financing costs. Broadly, a group will not face a restriction if its aggregate net tax-interest expense for the relevant period is no more than £2 million.
The £2 million amount is an annual figure and is proportionately adjusted where the group’s period of account is shorter or longer than 12 months. The threshold is frequently misunderstood in property structures because it is not a £2 million allowance for each Jersey company, property or UK special purpose vehicle (SPV). It applies at group level, so a portfolio spread across several companies may reach it sooner than a company-by-company review suggests, particularly where group-level or shareholder financing is involved.
That group-level perspective also explains why rising interest rates can change the analysis quickly. As well as increasing the interest expense itself, they can reduce UK tax EBITDA where rental margins have narrowed, with the result that a group may move from being comfortably below the threshold to being within CIR without a major change to its legal structure.
The first exercise is straightforward, but worth doing carefully: identify the group’s net tax-interest expense for the period, taking account of UK taxable companies and the CIR treatment of relevant financing items. Gross interest expense alone is not necessarily the answer; interest income and the technical definition of tax-interest also matter.
Once the threshold is in view, the pivotal issue for a Jersey structure is which entities belong in the calculation. CIR generally looks to the worldwide group reflected in consolidated accounts, rather than only to companies filing UK corporation tax returns, which means that the ultimate parent and the accounting consolidation analysis can matter as much as the UK property ownership chart.
That result can be counter-intuitive. A UK property company may be the only entity with UK-taxable rental profits, yet the CIR analysis can still extend to the wider consolidated group and its financial statements; nor do separate legal ownership, separate bank finance or separate property SPVs necessarily create separate CIR groups. Joint ventures, partnerships and minority investments may therefore need specific consideration.
The key records are the ownership chart, consolidated financial statements (where available), details of subsidiaries and investments, and the period ends used across the structure. Pull these together before attempting to model any restriction.
Establishing the group perimeter is only the first step, because the funding terms then need equally careful scrutiny. Shareholder loans are common in Jersey property structures: they can provide flexibility, facilitate acquisition funding and allow returns to be extracted differently from third-party bank debt, but they can also increase the structure’s CIR sensitivity.
Interest on shareholder or other related-party debt can form part of the relevant financing expense and may therefore either take the group over the £2 million threshold or increase the amount exposed to restriction. It can also matter to the group-ratio calculation, which compares the group’s UK tax position with its external financing position.
Although shareholder interest is not automatically disallowed, it should not be treated as an afterthought. The commercial terms, interest rate, payment profile, creditor identity, security package, accounting treatment and interaction with the rest of the financing stack all need to be understood.
A CIR review should also run alongside, rather than replace, the separate analysis of transfer pricing, the UK withholding-tax position, the deductibility rules for loan relationships and any hybrid or other mismatch rules. A funding arrangement can be unobjectionable for one purpose yet still create a CIR restriction, or vice versa.
Once the £2 million threshold is exceeded, the available deduction is not simply capped at £2 million; instead, the group’s interest capacity must be calculated. Under the default approach, that capacity is broadly linked to 30% of UK tax-EBITDA, subject to a further cap based on the group’s net interest expense in its accounts, although a group-ratio election may produce a more favourable result for a more highly geared worldwide group.
UK property businesses can be exposed where there is substantial debt but modest recurring taxable income. Void periods, deductible repairs, and development or refurbishment phases can all produce a mismatch between finance costs and the group’s tax-EBITDA, even where capital allowances separately reduce the group’s cash-tax liability.
If the available interest capacity is lower than the group’s net tax-interest expense, part of the deduction may be restricted. Carry-forward rules may allow relief in a later period, but this does not remove the immediate cash-tax and reporting implications. The calculation should use tax-adjusted figures, not merely 30% of accounting profit.
The recent CIR changes are primarily about administration and reporting-company appointments, rather than a change to the £2 million threshold or the underlying fixed-ratio and group-ratio calculations. They apply for periods of account ending on or after 31 March 2026.
Previously, appointing or revoking a reporting company required a formal notice to HMRC. That separate notice is no longer required: for the relevant period, an eligible, non-dormant UK group company may be appointed if more than half of the eligible companies authorise the appointment, with the relevant appointment details and confirmations then included in the interest restriction return.
The reforms also provide a correction mechanism where a company files an interest restriction return before it has been formally appointed. The group may subsequently appoint the company and treat that appointment as effective immediately before filing, although the relief is not automatic: an unauthorised filing can attract a £1,000 penalty unless the correction conditions, or another statutory exemption, are met.
For Jersey groups, fewer HMRC notice formalities should not be mistaken for a lighter governance burden. The new rules put greater weight on having an auditable record of the appointment, the required majority authorisation and the identity of each eligible UK group company. The change is made by Finance Act 2026, s 61. Consequential amendments to the electronic-filing rules are made by the Corporate Interest Restriction (Electronic Communications) (Amendment) Regulations 2026, reg 2, which have effect for periods of account ending on or after 31 March 2026 under reg 1(2).
The threshold, group-membership and funding analyses should culminate in a clear compliance plan, because CIR is administered by reference to the group rather than any one UK company. Where elections are needed, a restriction must be allocated or relevant amounts are to be preserved for future periods, the group may need to appoint an appropriate UK company as reporting company and file an interest restriction return; statutory deadlines mean that waiting can narrow the options available.
For periods ending on or after 31 March 2026, reporting-company appointments are period-specific and do not automatically carry forward, so the group should confirm that the required authority is in place for each relevant period. For Jersey directors and corporate service providers, the practical issue is governance: who monitors the threshold, receives refinancing information and updated shareholder-loan balances, and ensures that UK advisers have the ownership information and accounts needed to identify the worldwide group? The group should also retain evidence of the reporting-company appointment and the requisite UK-company authorisation.
For any Jersey group with a UK property business and meaningful borrowing, directors should ask:
The CIR rules do not make UK property borrowing inappropriate, and many structures will remain outside a restriction because of the £2 million threshold. That said, the use of offshore companies or separate SPVs is not, by itself, a reason for a Jersey group to take comfort: as interest costs rise, the real question is whether the wider group’s UK tax-interest position has changed.
A timely health-check can show whether there is no CIR issue, whether a return or election should be considered, or whether a future restriction needs to be reflected in cash-flow and refinancing decisions, which is far preferable to discovering the position only after the UK corporation-tax computation is finalised.
This article is a general overview, not a formal tax report or advice. The CIR analysis is fact-sensitive and should be considered alongside the group’s financing documents, ownership and accounting arrangements, and UK tax position.
Technical reference: the CIR regime is contained in Part 10 of the Taxation (International and Other Provisions) Act 2010, including the rules on interest capacity, group composition, elections and interest restriction returns.
We advise Jersey corporate service providers, property funds and family offices on CIR exposure in UK property structures, including threshold and group analysis, financing reviews, and support with reporting-company appointments, elections and returns. Contact us today.
For Jersey corporate service providers and directors, the economics of a UK property structure may have changed materially over the last few years. Refinancing, higher floating rates and shareholder funding can turn a previously manageable interest bill into a significant UK tax issue.
The question is whether the Corporate Interest Restriction (CIR) rules apply. Although the regime is often associated with large UK-headed groups, it can affect offshore groups, including Jersey structures with UK property businesses, if their net UK tax-interest expense exceeds the relevant threshold, potentially restricting deductions that would otherwise be available in computing UK taxable profits.
This is not something to leave until the tax return is being prepared. The answer will depend on the group’s make-up, its funding terms, the available accounts and, in some cases, elections that must be made within set time limits. For directors, early identification is usually much easier than retrospective repair.
The CIR rules are designed to limit a group’s corporation-tax deductions for interest and similar financing costs. Broadly, a group will not face a restriction if its aggregate net tax-interest expense for the relevant period is no more than £2 million.
The £2 million amount is an annual figure and is proportionately adjusted where the group’s period of account is shorter or longer than 12 months. The threshold is frequently misunderstood in property structures because it is not a £2 million allowance for each Jersey company, property or UK special purpose vehicle (SPV). It applies at group level, so a portfolio spread across several companies may reach it sooner than a company-by-company review suggests, particularly where group-level or shareholder financing is involved.
That group-level perspective also explains why rising interest rates can change the analysis quickly. As well as increasing the interest expense itself, they can reduce UK tax EBITDA where rental margins have narrowed, with the result that a group may move from being comfortably below the threshold to being within CIR without a major change to its legal structure.
The first exercise is straightforward, but worth doing carefully: identify the group’s net tax-interest expense for the period, taking account of UK taxable companies and the CIR treatment of relevant financing items. Gross interest expense alone is not necessarily the answer; interest income and the technical definition of tax-interest also matter.
Once the threshold is in view, the pivotal issue for a Jersey structure is which entities belong in the calculation. CIR generally looks to the worldwide group reflected in consolidated accounts, rather than only to companies filing UK corporation tax returns, which means that the ultimate parent and the accounting consolidation analysis can matter as much as the UK property ownership chart.
That result can be counter-intuitive. A UK property company may be the only entity with UK-taxable rental profits, yet the CIR analysis can still extend to the wider consolidated group and its financial statements; nor do separate legal ownership, separate bank finance or separate property SPVs necessarily create separate CIR groups. Joint ventures, partnerships and minority investments may therefore need specific consideration.
The key records are the ownership chart, consolidated financial statements (where available), details of subsidiaries and investments, and the period ends used across the structure. Pull these together before attempting to model any restriction.
Establishing the group perimeter is only the first step, because the funding terms then need equally careful scrutiny. Shareholder loans are common in Jersey property structures: they can provide flexibility, facilitate acquisition funding and allow returns to be extracted differently from third-party bank debt, but they can also increase the structure’s CIR sensitivity.
Interest on shareholder or other related-party debt can form part of the relevant financing expense and may therefore either take the group over the £2 million threshold or increase the amount exposed to restriction. It can also matter to the group-ratio calculation, which compares the group’s UK tax position with its external financing position.
Although shareholder interest is not automatically disallowed, it should not be treated as an afterthought. The commercial terms, interest rate, payment profile, creditor identity, security package, accounting treatment and interaction with the rest of the financing stack all need to be understood.
A CIR review should also run alongside, rather than replace, the separate analysis of transfer pricing, the UK withholding-tax position, the deductibility rules for loan relationships and any hybrid or other mismatch rules. A funding arrangement can be unobjectionable for one purpose yet still create a CIR restriction, or vice versa.
Once the £2 million threshold is exceeded, the available deduction is not simply capped at £2 million; instead, the group’s interest capacity must be calculated. Under the default approach, that capacity is broadly linked to 30% of UK tax-EBITDA, subject to a further cap based on the group’s net interest expense in its accounts, although a group-ratio election may produce a more favourable result for a more highly geared worldwide group.
UK property businesses can be exposed where there is substantial debt but modest recurring taxable income. Void periods, deductible repairs, and development or refurbishment phases can all produce a mismatch between finance costs and the group’s tax-EBITDA, even where capital allowances separately reduce the group’s cash-tax liability.
If the available interest capacity is lower than the group’s net tax-interest expense, part of the deduction may be restricted. Carry-forward rules may allow relief in a later period, but this does not remove the immediate cash-tax and reporting implications. The calculation should use tax-adjusted figures, not merely 30% of accounting profit.
The recent CIR changes are primarily about administration and reporting-company appointments, rather than a change to the £2 million threshold or the underlying fixed-ratio and group-ratio calculations. They apply for periods of account ending on or after 31 March 2026.
Previously, appointing or revoking a reporting company required a formal notice to HMRC. That separate notice is no longer required: for the relevant period, an eligible, non-dormant UK group company may be appointed if more than half of the eligible companies authorise the appointment, with the relevant appointment details and confirmations then included in the interest restriction return.
The reforms also provide a correction mechanism where a company files an interest restriction return before it has been formally appointed. The group may subsequently appoint the company and treat that appointment as effective immediately before filing, although the relief is not automatic: an unauthorised filing can attract a £1,000 penalty unless the correction conditions, or another statutory exemption, are met.
For Jersey groups, fewer HMRC notice formalities should not be mistaken for a lighter governance burden. The new rules put greater weight on having an auditable record of the appointment, the required majority authorisation and the identity of each eligible UK group company. The change is made by Finance Act 2026, s 61. Consequential amendments to the electronic-filing rules are made by the Corporate Interest Restriction (Electronic Communications) (Amendment) Regulations 2026, reg 2, which have effect for periods of account ending on or after 31 March 2026 under reg 1(2).
The threshold, group-membership and funding analyses should culminate in a clear compliance plan, because CIR is administered by reference to the group rather than any one UK company. Where elections are needed, a restriction must be allocated or relevant amounts are to be preserved for future periods, the group may need to appoint an appropriate UK company as reporting company and file an interest restriction return; statutory deadlines mean that waiting can narrow the options available.
For periods ending on or after 31 March 2026, reporting-company appointments are period-specific and do not automatically carry forward, so the group should confirm that the required authority is in place for each relevant period. For Jersey directors and corporate service providers, the practical issue is governance: who monitors the threshold, receives refinancing information and updated shareholder-loan balances, and ensures that UK advisers have the ownership information and accounts needed to identify the worldwide group? The group should also retain evidence of the reporting-company appointment and the requisite UK-company authorisation.
For any Jersey group with a UK property business and meaningful borrowing, directors should ask:
The CIR rules do not make UK property borrowing inappropriate, and many structures will remain outside a restriction because of the £2 million threshold. That said, the use of offshore companies or separate SPVs is not, by itself, a reason for a Jersey group to take comfort: as interest costs rise, the real question is whether the wider group’s UK tax-interest position has changed.
A timely health-check can show whether there is no CIR issue, whether a return or election should be considered, or whether a future restriction needs to be reflected in cash-flow and refinancing decisions, which is far preferable to discovering the position only after the UK corporation-tax computation is finalised.
This article is a general overview, not a formal tax report or advice. The CIR analysis is fact-sensitive and should be considered alongside the group’s financing documents, ownership and accounting arrangements, and UK tax position.
Technical reference: the CIR regime is contained in Part 10 of the Taxation (International and Other Provisions) Act 2010, including the rules on interest capacity, group composition, elections and interest restriction returns.
We advise Jersey corporate service providers, property funds and family offices on CIR exposure in UK property structures, including threshold and group analysis, financing reviews, and support with reporting-company appointments, elections and returns. Contact us today.
For Jersey corporate service providers and directors, the economics of a UK property structure may have changed materially over the last few years. Refinancing, higher floating rates and shareholder funding can turn a previously manageable interest bill into a significant UK tax issue.
The question is whether the Corporate Interest Restriction (CIR) rules apply. Although the regime is often associated with large UK-headed groups, it can affect offshore groups, including Jersey structures with UK property businesses, if their net UK tax-interest expense exceeds the relevant threshold, potentially restricting deductions that would otherwise be available in computing UK taxable profits.
This is not something to leave until the tax return is being prepared. The answer will depend on the group’s make-up, its funding terms, the available accounts and, in some cases, elections that must be made within set time limits. For directors, early identification is usually much easier than retrospective repair.
The CIR rules are designed to limit a group’s corporation-tax deductions for interest and similar financing costs. Broadly, a group will not face a restriction if its aggregate net tax-interest expense for the relevant period is no more than £2 million.
The £2 million amount is an annual figure and is proportionately adjusted where the group’s period of account is shorter or longer than 12 months. The threshold is frequently misunderstood in property structures because it is not a £2 million allowance for each Jersey company, property or UK special purpose vehicle (SPV). It applies at group level, so a portfolio spread across several companies may reach it sooner than a company-by-company review suggests, particularly where group-level or shareholder financing is involved.
That group-level perspective also explains why rising interest rates can change the analysis quickly. As well as increasing the interest expense itself, they can reduce UK tax EBITDA where rental margins have narrowed, with the result that a group may move from being comfortably below the threshold to being within CIR without a major change to its legal structure.
The first exercise is straightforward, but worth doing carefully: identify the group’s net tax-interest expense for the period, taking account of UK taxable companies and the CIR treatment of relevant financing items. Gross interest expense alone is not necessarily the answer; interest income and the technical definition of tax-interest also matter.
Once the threshold is in view, the pivotal issue for a Jersey structure is which entities belong in the calculation. CIR generally looks to the worldwide group reflected in consolidated accounts, rather than only to companies filing UK corporation tax returns, which means that the ultimate parent and the accounting consolidation analysis can matter as much as the UK property ownership chart.
That result can be counter-intuitive. A UK property company may be the only entity with UK-taxable rental profits, yet the CIR analysis can still extend to the wider consolidated group and its financial statements; nor do separate legal ownership, separate bank finance or separate property SPVs necessarily create separate CIR groups. Joint ventures, partnerships and minority investments may therefore need specific consideration.
The key records are the ownership chart, consolidated financial statements (where available), details of subsidiaries and investments, and the period ends used across the structure. Pull these together before attempting to model any restriction.
Establishing the group perimeter is only the first step, because the funding terms then need equally careful scrutiny. Shareholder loans are common in Jersey property structures: they can provide flexibility, facilitate acquisition funding and allow returns to be extracted differently from third-party bank debt, but they can also increase the structure’s CIR sensitivity.
Interest on shareholder or other related-party debt can form part of the relevant financing expense and may therefore either take the group over the £2 million threshold or increase the amount exposed to restriction. It can also matter to the group-ratio calculation, which compares the group’s UK tax position with its external financing position.
Although shareholder interest is not automatically disallowed, it should not be treated as an afterthought. The commercial terms, interest rate, payment profile, creditor identity, security package, accounting treatment and interaction with the rest of the financing stack all need to be understood.
A CIR review should also run alongside, rather than replace, the separate analysis of transfer pricing, the UK withholding-tax position, the deductibility rules for loan relationships and any hybrid or other mismatch rules. A funding arrangement can be unobjectionable for one purpose yet still create a CIR restriction, or vice versa.
Once the £2 million threshold is exceeded, the available deduction is not simply capped at £2 million; instead, the group’s interest capacity must be calculated. Under the default approach, that capacity is broadly linked to 30% of UK tax-EBITDA, subject to a further cap based on the group’s net interest expense in its accounts, although a group-ratio election may produce a more favourable result for a more highly geared worldwide group.
UK property businesses can be exposed where there is substantial debt but modest recurring taxable income. Void periods, deductible repairs, and development or refurbishment phases can all produce a mismatch between finance costs and the group’s tax-EBITDA, even where capital allowances separately reduce the group’s cash-tax liability.
If the available interest capacity is lower than the group’s net tax-interest expense, part of the deduction may be restricted. Carry-forward rules may allow relief in a later period, but this does not remove the immediate cash-tax and reporting implications. The calculation should use tax-adjusted figures, not merely 30% of accounting profit.
The recent CIR changes are primarily about administration and reporting-company appointments, rather than a change to the £2 million threshold or the underlying fixed-ratio and group-ratio calculations. They apply for periods of account ending on or after 31 March 2026.
Previously, appointing or revoking a reporting company required a formal notice to HMRC. That separate notice is no longer required: for the relevant period, an eligible, non-dormant UK group company may be appointed if more than half of the eligible companies authorise the appointment, with the relevant appointment details and confirmations then included in the interest restriction return.
The reforms also provide a correction mechanism where a company files an interest restriction return before it has been formally appointed. The group may subsequently appoint the company and treat that appointment as effective immediately before filing, although the relief is not automatic: an unauthorised filing can attract a £1,000 penalty unless the correction conditions, or another statutory exemption, are met.
For Jersey groups, fewer HMRC notice formalities should not be mistaken for a lighter governance burden. The new rules put greater weight on having an auditable record of the appointment, the required majority authorisation and the identity of each eligible UK group company. The change is made by Finance Act 2026, s 61. Consequential amendments to the electronic-filing rules are made by the Corporate Interest Restriction (Electronic Communications) (Amendment) Regulations 2026, reg 2, which have effect for periods of account ending on or after 31 March 2026 under reg 1(2).
The threshold, group-membership and funding analyses should culminate in a clear compliance plan, because CIR is administered by reference to the group rather than any one UK company. Where elections are needed, a restriction must be allocated or relevant amounts are to be preserved for future periods, the group may need to appoint an appropriate UK company as reporting company and file an interest restriction return; statutory deadlines mean that waiting can narrow the options available.
For periods ending on or after 31 March 2026, reporting-company appointments are period-specific and do not automatically carry forward, so the group should confirm that the required authority is in place for each relevant period. For Jersey directors and corporate service providers, the practical issue is governance: who monitors the threshold, receives refinancing information and updated shareholder-loan balances, and ensures that UK advisers have the ownership information and accounts needed to identify the worldwide group? The group should also retain evidence of the reporting-company appointment and the requisite UK-company authorisation.
For any Jersey group with a UK property business and meaningful borrowing, directors should ask:
The CIR rules do not make UK property borrowing inappropriate, and many structures will remain outside a restriction because of the £2 million threshold. That said, the use of offshore companies or separate SPVs is not, by itself, a reason for a Jersey group to take comfort: as interest costs rise, the real question is whether the wider group’s UK tax-interest position has changed.
A timely health-check can show whether there is no CIR issue, whether a return or election should be considered, or whether a future restriction needs to be reflected in cash-flow and refinancing decisions, which is far preferable to discovering the position only after the UK corporation-tax computation is finalised.
This article is a general overview, not a formal tax report or advice. The CIR analysis is fact-sensitive and should be considered alongside the group’s financing documents, ownership and accounting arrangements, and UK tax position.
Technical reference: the CIR regime is contained in Part 10 of the Taxation (International and Other Provisions) Act 2010, including the rules on interest capacity, group composition, elections and interest restriction returns.
We advise Jersey corporate service providers, property funds and family offices on CIR exposure in UK property structures, including threshold and group analysis, financing reviews, and support with reporting-company appointments, elections and returns. Contact us today.
For Jersey corporate service providers and directors, the economics of a UK property structure may have changed materially over the last few years. Refinancing, higher floating rates and shareholder funding can turn a previously manageable interest bill into a significant UK tax issue.
The question is whether the Corporate Interest Restriction (CIR) rules apply. Although the regime is often associated with large UK-headed groups, it can affect offshore groups, including Jersey structures with UK property businesses, if their net UK tax-interest expense exceeds the relevant threshold, potentially restricting deductions that would otherwise be available in computing UK taxable profits.
This is not something to leave until the tax return is being prepared. The answer will depend on the group’s make-up, its funding terms, the available accounts and, in some cases, elections that must be made within set time limits. For directors, early identification is usually much easier than retrospective repair.
The CIR rules are designed to limit a group’s corporation-tax deductions for interest and similar financing costs. Broadly, a group will not face a restriction if its aggregate net tax-interest expense for the relevant period is no more than £2 million.
The £2 million amount is an annual figure and is proportionately adjusted where the group’s period of account is shorter or longer than 12 months. The threshold is frequently misunderstood in property structures because it is not a £2 million allowance for each Jersey company, property or UK special purpose vehicle (SPV). It applies at group level, so a portfolio spread across several companies may reach it sooner than a company-by-company review suggests, particularly where group-level or shareholder financing is involved.
That group-level perspective also explains why rising interest rates can change the analysis quickly. As well as increasing the interest expense itself, they can reduce UK tax EBITDA where rental margins have narrowed, with the result that a group may move from being comfortably below the threshold to being within CIR without a major change to its legal structure.
The first exercise is straightforward, but worth doing carefully: identify the group’s net tax-interest expense for the period, taking account of UK taxable companies and the CIR treatment of relevant financing items. Gross interest expense alone is not necessarily the answer; interest income and the technical definition of tax-interest also matter.
Once the threshold is in view, the pivotal issue for a Jersey structure is which entities belong in the calculation. CIR generally looks to the worldwide group reflected in consolidated accounts, rather than only to companies filing UK corporation tax returns, which means that the ultimate parent and the accounting consolidation analysis can matter as much as the UK property ownership chart.
That result can be counter-intuitive. A UK property company may be the only entity with UK-taxable rental profits, yet the CIR analysis can still extend to the wider consolidated group and its financial statements; nor do separate legal ownership, separate bank finance or separate property SPVs necessarily create separate CIR groups. Joint ventures, partnerships and minority investments may therefore need specific consideration.
The key records are the ownership chart, consolidated financial statements (where available), details of subsidiaries and investments, and the period ends used across the structure. Pull these together before attempting to model any restriction.
Establishing the group perimeter is only the first step, because the funding terms then need equally careful scrutiny. Shareholder loans are common in Jersey property structures: they can provide flexibility, facilitate acquisition funding and allow returns to be extracted differently from third-party bank debt, but they can also increase the structure’s CIR sensitivity.
Interest on shareholder or other related-party debt can form part of the relevant financing expense and may therefore either take the group over the £2 million threshold or increase the amount exposed to restriction. It can also matter to the group-ratio calculation, which compares the group’s UK tax position with its external financing position.
Although shareholder interest is not automatically disallowed, it should not be treated as an afterthought. The commercial terms, interest rate, payment profile, creditor identity, security package, accounting treatment and interaction with the rest of the financing stack all need to be understood.
A CIR review should also run alongside, rather than replace, the separate analysis of transfer pricing, the UK withholding-tax position, the deductibility rules for loan relationships and any hybrid or other mismatch rules. A funding arrangement can be unobjectionable for one purpose yet still create a CIR restriction, or vice versa.
Once the £2 million threshold is exceeded, the available deduction is not simply capped at £2 million; instead, the group’s interest capacity must be calculated. Under the default approach, that capacity is broadly linked to 30% of UK tax-EBITDA, subject to a further cap based on the group’s net interest expense in its accounts, although a group-ratio election may produce a more favourable result for a more highly geared worldwide group.
UK property businesses can be exposed where there is substantial debt but modest recurring taxable income. Void periods, deductible repairs, and development or refurbishment phases can all produce a mismatch between finance costs and the group’s tax-EBITDA, even where capital allowances separately reduce the group’s cash-tax liability.
If the available interest capacity is lower than the group’s net tax-interest expense, part of the deduction may be restricted. Carry-forward rules may allow relief in a later period, but this does not remove the immediate cash-tax and reporting implications. The calculation should use tax-adjusted figures, not merely 30% of accounting profit.
The recent CIR changes are primarily about administration and reporting-company appointments, rather than a change to the £2 million threshold or the underlying fixed-ratio and group-ratio calculations. They apply for periods of account ending on or after 31 March 2026.
Previously, appointing or revoking a reporting company required a formal notice to HMRC. That separate notice is no longer required: for the relevant period, an eligible, non-dormant UK group company may be appointed if more than half of the eligible companies authorise the appointment, with the relevant appointment details and confirmations then included in the interest restriction return.
The reforms also provide a correction mechanism where a company files an interest restriction return before it has been formally appointed. The group may subsequently appoint the company and treat that appointment as effective immediately before filing, although the relief is not automatic: an unauthorised filing can attract a £1,000 penalty unless the correction conditions, or another statutory exemption, are met.
For Jersey groups, fewer HMRC notice formalities should not be mistaken for a lighter governance burden. The new rules put greater weight on having an auditable record of the appointment, the required majority authorisation and the identity of each eligible UK group company. The change is made by Finance Act 2026, s 61. Consequential amendments to the electronic-filing rules are made by the Corporate Interest Restriction (Electronic Communications) (Amendment) Regulations 2026, reg 2, which have effect for periods of account ending on or after 31 March 2026 under reg 1(2).
The threshold, group-membership and funding analyses should culminate in a clear compliance plan, because CIR is administered by reference to the group rather than any one UK company. Where elections are needed, a restriction must be allocated or relevant amounts are to be preserved for future periods, the group may need to appoint an appropriate UK company as reporting company and file an interest restriction return; statutory deadlines mean that waiting can narrow the options available.
For periods ending on or after 31 March 2026, reporting-company appointments are period-specific and do not automatically carry forward, so the group should confirm that the required authority is in place for each relevant period. For Jersey directors and corporate service providers, the practical issue is governance: who monitors the threshold, receives refinancing information and updated shareholder-loan balances, and ensures that UK advisers have the ownership information and accounts needed to identify the worldwide group? The group should also retain evidence of the reporting-company appointment and the requisite UK-company authorisation.
For any Jersey group with a UK property business and meaningful borrowing, directors should ask:
The CIR rules do not make UK property borrowing inappropriate, and many structures will remain outside a restriction because of the £2 million threshold. That said, the use of offshore companies or separate SPVs is not, by itself, a reason for a Jersey group to take comfort: as interest costs rise, the real question is whether the wider group’s UK tax-interest position has changed.
A timely health-check can show whether there is no CIR issue, whether a return or election should be considered, or whether a future restriction needs to be reflected in cash-flow and refinancing decisions, which is far preferable to discovering the position only after the UK corporation-tax computation is finalised.
This article is a general overview, not a formal tax report or advice. The CIR analysis is fact-sensitive and should be considered alongside the group’s financing documents, ownership and accounting arrangements, and UK tax position.
Technical reference: the CIR regime is contained in Part 10 of the Taxation (International and Other Provisions) Act 2010, including the rules on interest capacity, group composition, elections and interest restriction returns.
We advise Jersey corporate service providers, property funds and family offices on CIR exposure in UK property structures, including threshold and group analysis, financing reviews, and support with reporting-company appointments, elections and returns. Contact us today.