Buried in your AdSense settings is a tax form that decides whether the United States takes a slice of every pound your American viewers generate. Filed correctly, a UK creator pays 0% US withholding on AdSense royalties. Filed badly, Google withholds 30% of the US-source share. Not filed at all, and the rate is 24% of your total earnings worldwide — including the views from Manchester.
And over-withheld US tax is genuinely hard to get back, for a reason almost no creator hears in time: HMRC will not give you credit for US tax you were never required to pay.
Why the 30% exists
The United States charges a flat 30% on income paid from US sources to foreign persons — interest, dividends, rents and royalties — deducted at source before you see it. Because YouTube treats ad revenue earned from US viewers as US-source copyright royalties, a UK channel is inside those rules whether or not it has ever had anything to do with America.
The UK–US double taxation convention overrides the default. Article 12 covers royalties, and the rate the treaty permits the United States to charge a UK resident is 0%. The W-8BEN is simply you certifying, on the IRS’s own form, that you are UK resident and claiming that treaty rate. You submit it inside AdSense rather than to the IRS.
The same channel, three form states
1. Approved W-8BEN with a valid UK treaty claim. The treaty rate on royalties is 0%, so US tax withheld is £0. The full £60,000 reaches the bank — and all of it is taxable in the UK.
2. A form on file, but no valid treaty claim — wrong country, missing tax number, or simply expired. Withholding applies at 30% of the US-source portion: £6,300 gone, deducted before payout, with nothing in your bank statement to explain the shortfall.
3. No US tax information submitted at all. Google may apply backup withholding at 24% of total earnings worldwide, not just the US slice: £14,400 on £60,000 of revenue, most of it charged on views that never went near the United States.
Between the first line and the third, £14,400 on identical earnings — for a form that takes ten minutes to file.
The part that costs people twice
Creators assume over-withheld US tax comes back through their UK return. It does not. Foreign Tax Credit Relief is limited to the amount of foreign tax the treaty allows the other country to charge. For a UK creator’s AdSense royalties, that allowance is 0% — so where £6,300 was withheld and the treaty permitted nothing, the credit HMRC gives against your UK tax is nil. The excess is not written off in principle: it is recoverable from the IRS by filing a US non-resident return to claim a refund. In practice that is slow, paid work, and for a few hundred pounds it routinely costs more than it recovers.
Where foreign tax genuinely was withheld at a rate the treaty permits, relief is claimed on the foreign pages — SA106 — of your Self Assessment return. For AdSense royalties, a correctly-formed UK claim means there should be nothing there to relieve.
The ten-minute health check
- Open AdSense, then Payments, Manage settings, United States tax info.
- Confirm a form exists and that its status is approved — not pending, not invalid.
- Check it names the United Kingdom as your country of tax residence and carries a foreign tax identification number. For a UK individual that is your National Insurance number or your Unique Taxpayer Reference; without one the treaty claim fails and you drop back to 30%.
- Read the withholding rate the tool shows against each income type. For AdSense royalties, a UK creator should see 0%.
- Diarise the expiry. A W-8BEN lasts for the remainder of the calendar year you sign it plus the three following calendar years — sign it on 30 September 2026 and it lapses on 31 December 2029. Nothing announces it; the withholding simply restarts.
Streamers, sellers and everyone else
Twitch runs the equivalent process through Amazon’s tax interview, and the same treaty logic applies. Patreon, Substack and the app stores each have their own version of the same request. The rule of thumb: any US-headquartered platform paying you royalties or ad revenue will ask for a W-8BEN sooner or later, and the cost of ignoring the request is always higher than the cost of answering it.
One distinction worth holding on to. This is about royalties, not services. If a US brand pays you directly for a sponsored video, that is business profits under the treaty rather than royalty income, and the analysis — and the form — can differ. Worth asking before the invoice goes out rather than after the payment lands short.
The UK side does not go away
Every pound of AdSense income is taxable in the UK regardless of what the United States did or did not take. The treaty stops the same income being taxed twice; it does not make anything tax-free. Record it gross, in sterling, with any withholding shown as a separate line rather than netted off — otherwise your turnover is understated, and turnover is what the £90,000 VAT registration threshold and the Making Tax Digital thresholds are tested against. Our post on keeping one set of books across five platforms covers how to record it, and what the platforms report to HMRC covers the other side of the same coin.
What to do this week
- Open your AdSense tax info and screenshot the status and the withholding rates. Two minutes, and it tells you which of the three states above you are in.
- Pull the last twelve payment statements and search them for withheld US tax. If any is there, you have found money that should not have left.
- If the form is missing, expired or carries no treaty claim, submit a new one now. It applies going forward, not backwards, so every week of delay is a week of withholding you cannot undo.
- Repeat the check on every other US platform that pays you — Twitch, Patreon, the app stores, print-on-demand.
We check W-8BEN status for every YouTuber and streamer who joins us. It is the fastest money-finder in creator accounting, and the only fix in this article that costs nothing. Get started from £19 + VAT a month.
