Paying tax in the UK does not automatically replace your US tax filing requirements. Many Americans living abroad still need to file a US return each year, even if they already pay British taxes through PAYE and owe the IRS nothing extra.

That disconnect catches people off guard. Quite a few Americans move to the UK, settle into work, start paying HMRC, and slowly assume the US side faded into the background somewhere. Then a friend mentions FBARs over coffee, or they stumble across a Reddit thread at midnight, and suddenly they are deep into Google searching.

Sarah, an American living in Manchester, went through exactly that. She moved to Britain in 2022 for work, earns around £68,000 annually from a UK employer, and assumed her taxes were automatically handled through PAYE. Honestly, that is not an unreasonable assumption. The US system just happens to work differently. 

“Wait, I still have to file?”

In most cases, yes. The US taxes citizens based on citizenship rather than residency, which means Americans abroad still usually file annual US tax returns even while living permanently overseas.

Americans in the UK commonly still need to file if they:

• work for a British employer
• Freelance or run a side business
• earn above IRS filing thresholds
• hold UK savings or investment accounts

For the 2025 tax year filed in 2026, many single filers under 65 generally need to file once income reaches at least US$14,600. Self-employed Americans often have lower filing thresholds, as income above US$400 can trigger filing requirements.

That said, filing does not automatically mean paying tax twice. People mix those up constantly. 

The UK Already Taxed Me. So, Why Is America Still Involved?

Fortunately, the IRS does provide ways to reduce or eliminate double taxation. For Americans in Britain, the two most common tools are:

• the Foreign Tax Credit
• the Foreign Earned Income Exclusion

Sarah already pays relatively high UK income taxes, so in her case, the Foreign Tax Credit often makes more sense. Many Americans in the UK end up in a similar position because British tax rates can already offset most or all US tax liability.

The Foreign Earned Income Exclusion is often discussed online as a universal solution, though in practice, it isn’t always the best fit. Sometimes it limits later planning opportunities. A lot depends on your income source, future plans, and whether you have investments or retirement accounts.

For many Americans in Britain:

• The IRS still expects a return even if no tax is due
• UK taxes often reduce or eliminate additional US tax
• Choosing FEIE vs FTC is not always straightforward
• Filing incorrectly can create issues later, especially after years abroad

The Forms That Tend to Catch People Off Guard

This is usually where people start realizing cross-border taxes are more complicated than they first assumed.

Sarah has:

• a Barclays current account
• a Monzo savings account
• a Stocks and Shares ISA

At one point during the year, the combined balance exceeded US$10,000. That may trigger FBAR reporting requirements.

FBAR is not a tax form. It’s a reporting form.

That distinction matters because many Americans panic and assume they suddenly owe tax on their UK bank accounts. Usually, that is not what is happening.

Some of the forms Americans in the UK commonly run into include:

• Form 1040 for the main US tax return
• Form 1116 for foreign tax credits
• Form 2555 for foreign earned income exclusion claims
• FBAR for foreign account reporting
• Form 8938 in certain higher-value situations

The paperwork itself is not always the hardest part. Often, it is figuring out which forms actually apply to you.

Where Things Start Getting Messy for Americans in Britain

The genuinely confusing part tends to involve UK investments.

Sarah assumed her ISA was tax-free everywhere because, well, that is largely how ISAs are marketed in Britain. From a UK perspective, they are incredibly useful accounts. The IRS, however, does not necessarily treat them the same way.

Common trouble spots include:

• Stocks and Shares ISAs
• UK mutual funds
• PFIC reporting rules
• currency conversion requirements
• overlapping UK and US tax years

This is where online advice sometimes becomes frustratingly oversimplified. People hear “you probably won’t owe tax,” which may be true, but complicated reporting rules can still apply even if no additional tax is due.

Interestingly, many of the same issues come up for Americans elsewhere, too. Expat Tax Online has a separate guide for Americans filing from Australia, and the themes overlap quite a bit: local taxes are already being paid, yet US reporting obligations still continue quietly in the background.

Getting Help Before Things Spiral Into a Tax Headache

Some expat tax returns stay fairly straightforward. Others, especially once ISAs, pensions, self-employment income, or multiple UK accounts enter the picture, become confusing much faster than people expect.

Sarah realized that for herself. At first, she thought filing from Britain would just mean entering her UK salary into a few forms and moving on. Then came FBAR questions, exchange rates, and the realization that her ISA was not viewed the same way by the IRS.

That does not mean people should panic, though. Most filing issues can be corrected, even for Americans who missed filing returns for years while living abroad. In many cases, streamlined filing procedures are available for taxpayers who simply did not realize they still had US obligations overseas.

For Americans trying to untangle the process, Expat Tax Online offers a complete guide focused on filing US taxes while living in the UK, covering common reporting issues, filing requirements, and situations that tend to trip people up after moving abroad.

Honestly, most Americans overseas are not worried about taxes every single day. What tends to wear people down is the uncertainty. Not knowing whether they filed correctly. Not knowing whether they missed a form. That lingering “hopefully I did this right” feeling is usually the hardest part.