Why did my US payer deduct the full statutory rate on my dividends?
Because the statutory rate on passive payments to foreign persons is what the payer applies by default. The treaty rate is not a right the recipient claims later. It is a rate the payer is permitted to apply only if valid foreign-status certification is in hand at the time of payment. If nothing is on file, or what is on file has lapsed, the payer has no basis to reduce the rate and will not take the risk of doing so. Getting the certification to the payer, and keeping it current, is the only way the reduced rate appears on the payment itself.
My foreign-status certification expired, can the payer still use the treaty rate?
No, and you should expect the deduction to rise without warning. Certification has a life, and once it lapses the payer is back to the statutory default, because the condition for applying the treaty rate is a valid certificate held at the time of payment. The practical consequence is a run of payments withheld at the higher rate, which then has to be recovered through a US return or a refund claim. Diarising the renewal with each payer, and there is usually more than one, costs nothing and avoids the whole exercise.
The income was coded wrongly on my US statement, does that matter?
It matters a great deal, because the coding on the recipient statement is one of the three conditions for the treaty rate to hold. The others are valid foreign-status certification and a treaty article that actually covers the payment. A payment reported under the wrong income type can be taxed at a rate the treaty never intended for it, and a refund claim then has to explain the discrepancy between the statement and the underlying facts. The cleaner fix is upstream. Get the payer to correct the coding, ideally before the statement is issued for the year.
Does the treaty reduce the rate on every payment from a US customer?
No. The article has to cover the payment actually being made, and that is decided by the character of the income rather than by the invoice wording. Dividends, interest, royalties and business profits are dealt with differently, and a payment described loosely in a contract may not fall where either party assumed. This is the condition most often missed, because the certification is in place and the coding looks plausible, so everyone stops checking. If no article covers the payment, the statutory default is correct and there is nothing to recover.
How do I recover US tax that was over-withheld?
Through the US system, not the Canadian one. Where certification, coding or article coverage was missing at the time of payment, recovery is a US return or a refund claim for the year in which the payment was made. The claim has to reconcile what the payer reported against what the treaty permits, which means the recipient statement, the certification history and the character of the income all have to line up. It is slower and more evidential than simply having the right rate applied at source, which is the argument for fixing the payer's file first.
Can I just claim the treaty rate on my own tax return instead?
You can pursue the over-withheld amount through a US return or a refund claim, and that is the route when the rate at source was wrong. It is not a substitute for the payer's file being correct, for two reasons. The amount sits with the US Treasury until the claim is processed, and the claim itself depends on the same three conditions, which are certification, correct coding of the income, and an article that covers the payment. If those were missing when the payment was made, the claim has to establish them retrospectively rather than simply apply them.
What does Form W-8BEN actually do?
It tells a US payer that you are not a US person and, where you are entitled, claims the treaty rate on the income they are about to pay you — so withholding comes off at the reduced rate rather than the statutory one. It goes to the payer or the broker, never to the IRS, and it expires, so a stale form is a common cause of over-withholding. Getting it in before payment is the difference between a lower rate and a refund claim. See Form W-8BEN.
Does the United Kingdom have a tax treaty with the United States?
Yes — the UK and the USA have one, and so do around sixty other jurisdictions including Canada, India, Australia, Mexico, Brazil and most of western Europe. The existence of a treaty is rarely the useful fact, though. Two people in two treaty countries can get opposite answers on the same pension or the same royalty, because what decides the outcome is the specific article for that income type and any limitation-on-benefits condition attached to it. See our country guides.
