UK withholding tax

Withholding tax (WHT) has long been a key consideration for UK borrowers in cross-border financings. However, recent developments — in particular HMRC’s pause of its longstanding administrative concession — have significantly increased the financial and execution risk associated with getting it wrong.

For many borrowers, WHT is no longer a technical afterthought. It is a structural issue that can directly affect cost, timelines and deal certainty.

When does UK withholding tax apply?

As a starting point, UK WHT at 20% applies to payments of UK source “yearly interest” to non-UK lenders. Interest is generally treated as "yearly" where it arises on a debt that is capable of lasting 12 months or more — as distinct from "short" interest, which falls outside the WHT regime.

In practice, this means that most commercial lending arrangements will give rise to yearly interest including:

• Syndicated facilities;
• Intra-group loans; and
• Longer-term or revolving debt.

Unless an exemption or treaty relief applies, the borrower is required to withhold income tax at source.

How do borrowers typically manage withholding tax?

Borrowers will usually seek to eliminate or reduce WHT through:

HMRC concession pause – a material shift in risk

Historically, HMRC adopted a pragmatic approach where:

• Interest was paid gross before clearance was obtained; and
• The lender was in fact treaty-entitled.

In these circumstances, HMRC would generally not seek to recover the underlying WHT, instead charging only late payment interest.

That position has now changed.

HMRC has paused this concession while it undertakes a review of the process and relevant legislation, with no confirmed timeline for reinstatement. It is unclear what the outcome of this review may be.

What this means in practice

The impact for borrowers is significant:

Why this matters commercially

WHT has direct consequences under finance documents:

• Gross-up clauses typically place the economic burden on the borrower, although LMA-standard facility agreements include important qualifications — in particular, the "Qualifying Lender" concept, which allocates WHT risk where a lender ceases to be treaty-eligible or where a transfer gives rise to a new WHT liability.
• Lender transfers or syndications can trigger new WHT exposures.
• Treaty eligibility analysis can be complex, particularly for:
  
  • Funds and transparent entities
  • Multi-jurisdictional lender groups.

Without careful structuring, borrowers can face unexpected increases in financing costs.

Key risk areas

Borrowers should be particularly alert to:

• Interest paid before HMRC clearance is obtained;
• Non‑treaty or partially treaty‑eligible lenders;
• Secondary transfers within a syndicate;
• Intra‑group financing arrangements where process discipline may be weaker; and
• Facilities where the Double Taxation Treaty Passport (DTTP) scheme has not been utilised — the DTTP scheme provides a streamlined process for confirming treaty eligibility in syndicated lending and can materially reduce execution risk on lender transfers.

This development is consistent with HMRC’s broader compliance focus, including increased scrutiny of WHT procedures during enquiries and due diligence reviews. HMRC has placed growing emphasis on the quality of contemporaneous documentation and the rigour of internal processes supporting any decision to pay interest gross.

Borrowers should be able to demonstrate:

• A clear analysis of whether WHT applies;
• The legal basis for any exemption or treaty relief; and
• Robust processes to manage lender changes and ongoing compliance.

Key takeaway

The pause of HMRC’s concession shifts WHT from an administrative inconvenience to a material economic and governance risk.

Borrowers can no longer rely on retrospective pragmatism where the correct procedures have not been followed.

Recommendation

UK borrowers should take a proactive approach:

• Do not pay interest gross without HMRC clearance;
• Build WHT analysis into transaction timetables;
• Review finance documents for risk allocation and recovery mechanics; and
• Identify and assess any historic exposure.

The interaction between tax, legal documentation and operational processes in this area is complex, and the consequences of non-compliance are now materially more severe. Borrowers and their treasury and legal teams should ensure that specialist tax and legal advice is embedded at an early stage of any cross‑border financing — not as a final check, but as an integral part of transaction planning and execution.

How can we help?

Our Tax Team has a wealth of experience providing commercial and insightful advice to corporates, national and international banks, building societies, other funders and institutions in the financial services sector.

We offer a tax structuring and advisory service to clients as part of our national reach, as well as tax transactional support on business and real estate transactions.

If you are interested in discussing any of the topics covered in this article, get in touch with our Tax specialists below.

This publication is intended for general guidance and represents our understanding of the relevant law and practice as at June 2026.  For more information see our terms & conditions.