How to buy US stocks from the UK and what you need to know about the W-8BEN form
Buying US stocks from the UK is straightforward, but the paperwork and tax treatment differ from trading on the London Stock Exchange. Here are the key steps.
- Choose a broker that offers US share dealing. Most UK brokers give access to NYSE and NASDAQ, but check their currency conversion fees and platform charges.
- Complete a W-8BEN form. This certifies that you are a UK resident for tax purposes and lowers US dividend withholding from 30% to 15% under the UK-US tax treaty.
- Buy in US dollars. Your broker converts GBP to USD at a spread, and you pay that cost again when you sell.
- Expect 15% US dividend tax on any payouts. This is deducted automatically and cannot be avoided inside an ISA or SIPP.
- Declare US dividends on your UK tax return. They are taxable in the UK, but you can claim the 15% as a foreign tax credit and use your annual dividend allowance.
What is a W-8BEN?
The W-8BEN is a US Internal Revenue Service form for non-US residents. It tells the broker and the US tax authorities that you are not a US citizen or US tax resident, and that your home country has a tax treaty with the United States.
For UK investors, that treaty reduces withholding tax on dividends from 30% to 15%. Without the form, your broker must withhold 30%. With it, they apply 15%. The form is valid for three years and your broker should remind you when it expires.
US dividend withholding tax for UK investors
US dividend withholding tax is deducted from the gross dividend before the cash reaches your account. For UK residents with a valid W-8BEN, the rate is 15%. This is a definitional treaty rate, not a personal tax number.
That 15% is a final US tax. You cannot reclaim it from the IRS as a standard individual investor. But you use it as a foreign tax credit on your UK self-assessment tax return.
If your broker does not have your W-8BEN on file, the default rate is 30%. So the form is not optional. It is essential.
UK tax on US dividends
US dividends are treated as normal dividend income by HM Revenue & Customs. They count towards your UK dividend allowance, which resets each tax year. Dividends above the allowance are taxed at your dividend rate, depending on your income band.
Because the US already took 15%, your UK tax bill is reduced by that same 15% via the foreign tax credit. This avoids double taxation. Your UK tax return must include the gross dividend, the US tax withheld, and the net dividend you received.
How an ISA or SIPP changes the picture
Inside a Stocks and Shares ISA, US dividends are free from UK income tax and do not use your dividend allowance. The 15% US withholding still applies, and you cannot reclaim it.
A SIPP works in a similar way. The pension wrapper protects the dividends from UK tax on your contribution or accumulation, but the US 15% withholding is still deducted at source. Some SIPPs may allow a treaty reclaim, but that is rare and depends on your provider.
Neither wrapper avoids the US withholding tax. The key is to get that W-8BEN completed correctly so you pay 15% rather than 30%.
Currency, pence and the 100x trap
On the London Stock Exchange, many UK shares quote in pence, so a price of 100 GBX means £1. A whole market of share prices can mislead someone new to LSE trading. When you buy US stocks, the quotation is in US dollars and cents, so there is no pence conversion trap.
The real trap is the exchange rate. A US stock at $50 costs you roughly £40 depending on the conversion. Brokers charge a spread on the GBP/USD conversion, and you pay that on both buying and selling. That can eat into returns more than the dividend withholding.
Stamp duty and dealing costs
UK stamp duty reserve tax of 0.5% applies to purchases of shares in UK companies trading on the LSE. Buying US stocks on the NYSE or NASDAQ does not trigger that UK stamp duty. You may pay small US exchange fees, but the UK 0.5% is not one of them.
Your broker will still charge a dealing commission and a foreign exchange fee. Those are broker-specific and vary with the platform, so compare them before opening an account.
The bottom line
To buy US stocks from the UK, open a broker with US access, complete the W-8BEN to reduce withholding to 15%, and include US dividends on your UK self-assessment. An ISA or SIPP protects against UK dividend tax, but not the US withholding. This guide is analysis and education, not personalized financial advice.
AlphaTeak scores any stock across eight pillars, estimates fair value, and keeps an honest, public track record. Analysis and education, not advice.
Get AlphaTeak