Why Intercompany Loans Attract Scrutiny
Multi-entity corporate structures in the fintech and technology sector regularly involve intercompany lending. Parent companies lend to subsidiaries to fund operations, group treasury entities lend to operating companies to centralise funding, and offshore entities may hold intellectual property that is funded by intercompany debt. In each case, the economic structure is legitimate and often the most efficient way to deploy capital within a group.
The problem is that intercompany loans are one of the most commonly used mechanisms for profit shifting in multinational groups. HMRC is well aware of this, and both the transfer pricing rules (Part 7 TIOPA 2010) and the Corporate Interest Restriction (Finance Act 2017) exist specifically to address it. These rules apply to groups that are not trying to shift profits as well as those that are: the rules are mechanical, and a group that has not analysed its intercompany loans against these rules may be inadvertently non-compliant.
Transfer Pricing Rules for Intercompany Loans
The fundamental rule for intercompany loans under UK transfer pricing legislation (Part 7 TIOPA 2010, which incorporates OECD guidelines) is the arm's length principle: the interest rate on an intercompany loan must be the rate that independent parties, dealing at arm's length, would agree given the specific terms and circumstances of the loan.
This sounds straightforward. It is not, for several reasons that are specific to intercompany lending:
The implicit support question
One of the most contentious issues in intercompany loan pricing is whether the borrowing entity should be priced as a standalone entity or with the implicit support of its parent group. The OECD guidelines (revised in 2020 and incorporated into HMRC's own guidance) establish that an entity borrowing within a group benefits from passive association with the group, and that the arm's length price should reflect this. In practice, this means HMRC will not accept an interest rate that is priced as if the subsidiary were a completely independent, unsupported borrower.
Setting an arm's length interest rate
The most reliable method for setting an arm's length interest rate on an intercompany loan is the Comparable Uncontrolled Price (CUP) method, using publicly traded debt of comparable entities as a benchmark. The steps are: determine an internal credit rating for the borrowing entity (reflecting its leverage, coverage ratios, business risk, and the implicit group support described above); identify publicly traded bonds or loans from entities with a similar credit profile; use the yield on those instruments as the benchmark for the intercompany rate, adjusted for any differences in terms (maturity, currency, security).
Internal credit rating analysis is typically done using a rating methodology that mirrors the approaches used by Moody's, S&P, or Fitch, applied to the specific financial metrics of the borrowing entity. This analysis must be documented contemporaneously and updated when the loan terms change or when material changes occur in the borrower's financial position.
Thin Capitalisation: When HMRC Can Restrict Your Deductions
Thin capitalisation is a specific application of the arm's length principle to the quantum of debt, not just its pricing. The question is: would an independent lender have provided this amount of debt to this borrower on these terms? If the answer is no, HMRC can restrict the interest deduction to the amount of interest on the debt that an independent lender would have provided.
The practical scenario where thin capitalisation arises is a UK subsidiary funded by a large intercompany loan from its parent, with the result that the UK subsidiary has a very high debt-to-equity ratio relative to comparable standalone businesses. An independent bank would not lend on those terms; the subsidiary is only able to carry that debt because the parent is providing it. HMRC's position is that the excess interest (on the debt above what an independent lender would have provided) is not deductible.
The UK does not have a statutory thin capitalisation safe harbour (unlike some jurisdictions). The analysis must be done case by case. The starting point is typically a credit analysis of the borrowing entity as if it were a standalone entity, followed by an assessment of how much debt a bank would have lent on that basis, with appropriate adjustments for implicit group support.
The Corporate Interest Restriction: A Separate, Mechanical Cap
The Corporate Interest Restriction (CIR), introduced by the Finance Act 2017 and based on OECD BEPS Action 4, operates independently of the transfer pricing rules. It is a mechanical cap on the total amount of net interest deductions available to a UK group, regardless of whether individual intercompany loans are priced at arm's length.
The CIR applies to UK groups (broadly, two or more connected companies) with aggregate net interest expense above £2,000,000 per annum. Below this threshold, the CIR does not apply. Above it, the rules limit UK net interest deductions to the lower of:
- 30% of UK tax-EBITDA (the "fixed ratio rule"), or
- The group ratio, which is the group's actual interest/EBITDA ratio as reported in its consolidated accounts (the "group ratio rule")
The group ratio rule is available where the group's actual interest-to-EBITDA ratio (calculated on a modified basis from the consolidated accounts) is higher than 30%, which provides some relief for highly leveraged groups. However, for most growth-stage fintech and technology groups, the fixed ratio rule (30% of tax-EBITDA) is the operative cap.
Worked CIR Calculation
In this example, £2,000,000 of the £10,000,000 net interest expense is disallowed under the CIR fixed ratio rule. The restricted amount is carried forward (not permanently lost) and can be deducted in future periods when capacity becomes available. However, the carry-forward position must be tracked meticulously, and its value depends on future tax capacity that is not guaranteed.
Tax-EBITDA for CIR purposes is not the same as IFRS or management accounts EBITDA. It starts with UK taxable profit and adds back specific items including tax depreciation and amortisation (rather than accounting depreciation), interest, and loss relief brought forward. Groups with significant UK losses or large capital allowances claims will find that their tax-EBITDA differs materially from their management accounts EBITDA.
"The CIR restriction creates a carry-forward, not a permanent disallowance, but that is cold comfort if the deferred deduction is worth 30p in the pound less in a future period when the group has reorganised its structure or tax rates have changed."
Setting Arm's Length Interest Rates in Practice
For a fintech group with a multi-entity structure, the practical approach to setting arm's length intercompany interest rates involves the following steps, which should be completed before any new intercompany loan is put in place and reviewed annually:
- Assess the borrower's credit quality: Apply a credit rating methodology to the borrowing entity's financials. Consider revenue, profitability, leverage (net debt to EBITDA), interest coverage (EBIT to interest), free cash flow, and qualitative factors such as market position and management quality. For a loss-making growth company, this analysis will often produce a speculative grade rating (below investment grade).
- Assess the implicit group support benefit: Adjust the standalone rating upward to reflect the benefit of being part of the group. The OECD guidance sets out a framework for this adjustment; the extent of the uplift depends on the group's own credit quality and the likelihood of support being provided.
- Benchmark against comparable market instruments: Identify publicly traded bonds, syndicated loans, or Bloomberg loan data for entities with a comparable credit profile. The yield on these instruments (adjusted for any differences in maturity, security, or currency) provides the arm's length benchmark.
- Document the analysis contemporaneously: The rate, the credit analysis, and the benchmarking must be documented at the time the loan is made. Retrospective justification of an interest rate is less credible and may attract penalty loading if HMRC challenges it.
Documentation Requirements
HMRC requires contemporaneous transfer pricing documentation for larger groups. The obligation applies where the UK entity is not a small company (broadly, fewer than 50 employees and either turnover below £10m or balance sheet total below £10m). For larger groups, the documentation must be in place before the tax return is filed for the relevant year.
Key Takeaways
- Intercompany loan interest rates must satisfy the arm's length principle under Part 7 TIOPA 2010. A rate that is commercially familiar but has not been economically justified by credit analysis and benchmarking is non-compliant.
- The implicit group support question requires analysis of whether the borrower benefits from being part of the group, and the arm's length rate should reflect this benefit.
- Thin capitalisation is a separate issue from the rate: it addresses whether the quantum of debt itself would have been provided by an independent lender. There is no statutory safe harbour in the UK.
- The Corporate Interest Restriction (CIR) caps UK net interest deductions at 30% of tax-EBITDA where net interest expense exceeds £2m. This is a mechanical rule that applies regardless of arm's length compliance.
- In the worked example, a company with £10m of net interest expense and £20m of tax-EBITDA faces a CIR restriction of £2m and a consequent tax cost of £500,000 at 25%.
- Tax-EBITDA for CIR purposes differs from management accounts EBITDA; the calculation requires careful preparation.
- Contemporaneous transfer pricing documentation (Master File and Local File) is a legal requirement for non-small groups. It must be in place before the tax return is filed, not assembled retrospectively in response to an enquiry.
