Withholding Tax on Loan Interest: A Guide for UK Borrowers

Under ITA 2007 s874, UK payers must generally deduct basic rate income tax from yearly interest arising in the UK before it reaches the lender. Statutory exemptions and treaty clearance can permit gross payment, but only once the formal conditions are met, not before.

TL;DR:

• Non-resident lenders cannot rely solely on UK domestic exemptions when cross-border facilities trigger withholding obligations, especially for offshore interest payments.
• Listing status for Eurobonds must be confirmed at each payment date, not only at issuance, to avoid retrospective withholding liabilities.
• Treaty relief is only effective from the date HMRC issues a formal direction, so withholding at the full rate is necessary before clearance is received; early gross payments can lead to penalties and repayment claims.
• Payers must precisely reconcile CT61 returns with loan accounts and monitor the timing of interest payments to prevent late deductions and accrue interest penalties.
• Structuring debt and sequencing payments should incorporate withholding considerations upfront to prevent delays and unexpected tax liabilities in property finance transactions.

Table of Contents

• Who must withhold and what rate applies
• What counts as yearly interest and how UK source is decided
• Statutory exemptions that allow gross interest payments
• Treaty relief, the passport scheme and HMRC clearance
• The CT61 return: accounting for deducted tax on time
• What happens when a payer gets it wrong
• A practical checklist for corporate borrowers and advisers
• What this means for structured property finance deals
• How James William & Co Capital can help with your funding structure
• Sources
• FAQ

Who must withhold and what rate applies

Section 874 of the Income Tax Act 2007 places the deduction duty on UK companies, local authorities and certain partnerships that pay yearly interest with a UK source. It captures far more than bank lending: shareholder loans, intercompany facilities and private credit arrangements common in structured property finance all fall within scope unless an exemption applies.

That change matters for anyone modelling long-dated facilities now, since a loan agreed today may cross the rate boundary before maturity.

• Corporate borrowers, including special purpose vehicles used in development finance, are payers for these purposes.
• The obligation applies regardless of whether the lender is UK resident or overseas, though the consequences differ sharply.
• Cross-border facilities are the most common trigger point, because non-resident lenders cannot rely on UK domestic exemptions alone.

What counts as yearly interest and how UK source is decided

‘Yearly interest’ under Part 15 covers interest on loans capable of lasting, or actually lasting, more than a year, along with certain manufactured payments and alternative finance returns treated as interest for tax purposes. Short-term facilities can still be caught if the underlying arrangement is intended to run longer.

Determining UK source is a factual exercise, not a single test. HMRC and the courts look at where the debtor resides, where the loan is secured, the currency and governing law, and where enforcement would take place.

1. A loan from an offshore family office secured against a UK development site typically has a UK source.
2. Interest paid by a UK special purpose vehicle to its offshore parent on an intercompany facility is usually UK sourced, even when funds are advanced from abroad.
3. Interest on a facility secured entirely against overseas assets and paid to a UK lender may fall outside UK source rules entirely.

Related-party loans in multi-layered debt stacks deserve particular care, since the presence of a UK borrower is often enough to establish source regardless of where the ultimate lender sits.

Statutory exemptions that allow gross interest payments

Several exemptions let a payer make interest payments without deduction, but each has conditions that must be checked before, not after, the payment is made.

• The banking exemption covers interest paid by banks in the ordinary course of their business, as set out in ITA 2007 s878.
• The UK resident corporate exemption allows gross payment where both payer and recipient are UK companies within charge to corporation tax on the interest.
• The quoted Eurobond exemption applies where the debt instrument is listed or admitted to trading on a recognised stock exchange, as explained in HMRC’s CTM35218 guidance.
• Narrower reliefs exist for specific categories such as certain qualifying private placements, though these apply less often in typical property finance structures.

The Eurobond exemption is the one that catches people out most. Listing status must exist at the date of each payment, not merely at issuance, and gaps in admission to trading can create a retrospective withholding liability across a whole coupon period.

Pro Tip: Confirm and document exchange admission on or before every coupon date, not once at drawdown, since listing status is tested payment by payment.

Treaty relief, the passport scheme and HMRC clearance

Double taxation agreements can reduce or eliminate UK withholding for overseas lenders, but treaty relief is never automatic. A lender must either apply for certified relief or, where eligible, use the Double Taxation Treaty Passport Scheme, under which HMRC issues the borrower a formal direction once the lender’s passport application is approved.

• The lender applies for a treaty passport and, once granted, the borrower registers the loan against that passport with HMRC.
• HMRC then issues a direction authorising reduced or nil withholding, typically taking effect from the date specified in that direction, not from the date of the loan itself.
• Until that direction arrives, the borrower must continue deducting at the full basic rate, regardless of how confident the parties are that relief will ultimately be granted.

This is the single most common trap in cross-border property lending: treating an in-progress passport application as if it already permits gross payment. As HMRC’s INTM413220 guidance makes clear, borrowers who pay gross before receiving a direction remain liable for the unpaid tax and late payment interest even if clearance is granted shortly afterwards. Any relief for earlier periods must then be recovered through a separate repayment claim, subject to its own time limits, rather than simply corrected on the next return.

The CT61 return: accounting for deducted tax on time

Any company that has deducted income tax from interest payments during a return period must account for it using the CT61 return, covered in HMRC’s published CT61 notes.

1. Return periods normally run in calendar quarters, and the return together with payment of tax deducted is due within 14 days of the quarter end.
2. Each return should reconcile precisely with the interest figures in the company’s accounts and loan relationship schedules, since HMRC frequently checks this cross-reference during enquiries.
3. Where treaty relief is granted after tax has already been withheld and paid over, the lender or borrower must submit a separate repayment claim rather than adjusting a future CT61 return.

Getting the return period boundaries wrong is a frequent, avoidable error, particularly where a facility completes close to a quarter end and the first interest payment straddles two periods.

What happens when a payer gets it wrong

HMRC can assess unpaid tax where a payer fails to deduct correctly, and late payment interest accrues under TMA70 s87 from the date the tax should have been paid, regardless of the reason for the shortfall. Penalties can follow on top of that where returns are late or incorrect, as set out in the CT61 guidance notes.

• Paying gross while a treaty passport or clearance application is still pending is the most common and most expensive mistake.
• Assuming Eurobond listing continues automatically, without checking admission to trading at each payment date, creates unexpected liabilities.
• Poor reconciliation between CT61 filings and statutory accounts tends to trigger the enquiries that then uncover the earlier two problems.

A CT61 return and its payment are due within 14 days of the end of the relevant quarter, leaving little room to correct a missed deduction before interest starts accruing.

A practical checklist for corporate borrowers and advisers

Before any interest payment leaves the business, run through a short sequence of checks rather than relying on assumptions carried over from the last deal.

1. Classify the payment: confirm it is yearly interest with a UK source before assuming deduction is required.
2. Check the recipient’s status: UK company, bank, or overseas lender with or without a treaty passport in place.
3. Confirm whether HMRC has issued a direction permitting reduced or nil withholding, and keep that direction on file.
4. Where an exemption is claimed, retain the supporting evidence, including exchange listing confirmation for quoted Eurobonds.
5. If treaty relief is pending, withhold at the full rate and prepare the repayment claim documents in parallel, rather than waiting for clearance to arrive first.
6. Reconcile every CT61 entry against the loan relationship accounts before filing, not after.

Pro Tip: Build the withholding check into the completion checklist for every facility, not as a separate tax task, so it happens before funds move rather than after a query lands from HMRC.

What this means for structured property finance deals

Withholding rules shape how we sequence a debt stack from the outset, not as an afterthought once terms are agreed. We check lender status and treaty position before introducing offshore capital into a structure, so gross-up exposure is priced in rather than discovered mid-transaction. That discipline keeps completion dates intact.

— James William Dawes

How James William & Co Capital can help with your funding structure

Withholding obligations rarely sit in isolation. They interact with covenant packages, gross-up clauses and lender selection across layered debt stacks, and getting the sequencing wrong can delay completion on a time-sensitive deal.

James William & Co Capital arranges bridging finance, development finance, joint venture equity and mezzanine finance, and commercial mortgages for property developers and investors, working alongside your tax advisers to structure facilities that account for withholding and cross-border lender issues from the outset. Our access to specialist lenders and private credit funds beyond mainstream banks means we can often move quickly once terms are agreed. Get in touch to discuss your next transaction.

Sources

• Income Tax Act 2007 (Part 15, Chapter 3, s874)
• Notes on completing your CT61 Return (HMRC PDF)

FAQ

Do you pay withholding tax on interest?

UK payers generally must deduct basic rate income tax from yearly interest with a UK source before paying it out, under ITA 2007 s874. Exemptions such as the banking exemption, the UK corporate exemption or the quoted Eurobond exemption can permit gross payment where their conditions are met.

What is the resident withholding tax on interest in the UK?

The UK does not operate a separate “resident withholding tax” regime for interest. Instead, the same basic rate deduction under section 874 applies to yearly interest paid to UK and overseas recipients alike, subject to the statutory exemptions and treaty relief described above.

Is there a withholding tax in the UK?

Yes, the UK requires deduction of income tax at the basic rate from yearly interest arising in the UK under ITA 2007 s874. It applies to corporate borrowers, local authorities and qualifying partnerships, with relief available through domestic exemptions or double taxation treaties.

What is the rate of withholding tax on interest?

The rate applies unless a statutory exemption or a formal treaty direction from HMRC permits a reduced rate or gross payment.