When a UK company pays interest, royalties, or certain other payments to a non-resident, UK withholding tax can apply at a default rate of 20%. The default rate is then often reduced or eliminated by double tax treaty, by specific UK exemptions, or — pre-Brexit — by the EU Interest and Royalties Directive. The mechanics have shifted since Brexit and the system still trips up smaller groups that are not used to thinking about source-state withholding.
The default UK withholding regime
Under ITA 2007 Part 15, certain payments from UK persons to non-residents are subject to UK withholding tax. The main categories are annual interest on loans, royalties, and certain other annual payments. The basic rate is 20%, which is the UK basic income tax rate, even when the underlying recipient is a company.
The withholding tax is the UK source state's claim on the payment, irrespective of whether the recipient owes tax in their residence state. The withholding is creditable against the recipient's home-country tax liability, subject to the rules of that country and the relevant treaty.
The interest withholding rules
UK withholding tax on interest applies to "yearly interest" — interest on debts that are capable of lasting more than one year. Interest on short-term commercial debts (trade debts, current account interest) is generally not yearly interest and falls outside the withholding regime.
Exemptions and reductions are the norm rather than the exception. The main reliefs include payments to UK companies (no withholding on interest paid to UK corporate recipients within the corporation tax net), payments to qualifying private placement (QPP) lenders that meet specific UK rules, payments to recognised banks that are not actually banking the interest as principal, and payments under double tax treaty articles that reduce or eliminate the rate.
The QPP exemption was introduced in 2015 to attract private placement debt to the UK and allows UK borrowers to pay interest gross to qualifying institutional lenders, even where treaty relief would otherwise impose a residual rate.
Royalties and the wider definition
Royalty withholding applies to payments for the use of intellectual property — patents, copyrights, trademarks, designs, and certain know-how. The UK definition is broader than the OECD treaty definition in some respects, particularly around software royalties and rights over digital content.
Treaty rates on royalties commonly run from 0% (some EU member state treaties, the UK/US treaty for most royalty types) up to 10% or 15% (some emerging market treaties). The UK/India treaty, for example, has a 10% or 15% withholding rate on royalties depending on the type, and the UK/UAE treaty exempts royalties from UK withholding entirely.
How treaty relief is claimed
Treaty relief is not automatic. The UK payer must hold a treaty clearance from HMRC (or be confident in the recipient's entitlement) before paying gross or at the reduced rate. The mechanism is via Double Taxation Treaty Passport for repeat-eligible lenders or via DT-Company forms for one-off claims.
Without prior clearance, the UK payer must withhold at the full 20% rate and the recipient must reclaim the over-withheld amount via HMRC. The reclaim can take months or years. Most treasury teams obtain clearance before the first payment to avoid the cash drag.
The post-Brexit position on the Interest and Royalties Directive
Before Brexit, the EU Interest and Royalties Directive eliminated withholding tax on qualifying payments between associated companies in different EU member states. The UK left the Directive at the end of the transition period (31 December 2020), and from 1 June 2021 the UK applied its domestic rules and treaties without the Directive overlay.
For payments from the UK to EU recipients, the position now depends on the relevant UK/EU member state treaty. Most UK treaties with EU members eliminate or substantially reduce withholding on interest and royalties between associated companies, so the practical effect of losing the Directive was modest. But for some categories and some member states, the residual rate is higher than under the Directive.
The corporation tax exemption
The most commonly relied-on exemption is that UK withholding does not apply to interest paid to UK corporates within the UK corporation tax net. This makes intra-group loans between UK companies free of withholding, although they remain within transfer pricing rules and the corporate interest restriction.
Interest paid to UK PEs of non-resident companies generally also benefits from this exemption, on the basis that the interest is within the UK corporation tax net through the PE.
Common compliance points
UK payers must operate withholding correctly under the CT61 procedure: pay the gross interest or royalty, withhold the applicable amount, and remit it to HMRC quarterly via Form CT61. The CT61 due dates are 14 January, 14 April, 14 July, and 14 October for each calendar quarter.
Penalties for failing to withhold or under-withholding fall on the UK payer, not the recipient. We see groups that have not operated withholding for years because they assumed treaty relief applied — only to find that without holding the clearance, the relief is provisional.
The wider picture: beneficial ownership and anti-abuse
Treaty access requires the recipient to be the beneficial owner of the income. Conduit companies that pass income on to a tax-haven parent without retaining real economic interest in the receipts can be challenged. The UK applies a general anti-abuse principal-purpose-test under MLI-amended treaties, and HMRC has used it in dispute cases.
How PushDigits supports cross-border payment flows
Our tax planning team reviews intra-group financing arrangements, structures treaty clearances for interest and royalty flows, and ensures CT61 compliance is in place. Our business advisory team works with groups expanding into or out of the UK on the structural questions about where IP and financing functions should sit.
If you have cross-border interest or royalty payments that you have not stress-tested against withholding rules, book a withholding review or visit our contact page.