Never filed a US tax return? The streamlined route back

Figures relate to tax year 2025 (US) · 2025-26 (UK)

A recurring conversation: someone born in the US who left as a child, or an American who moved to London a decade ago and assumed paying UK tax was the end of it, discovers they have been required to file with the IRS all along. The fear that follows is usually worse than the actual position.

What the programme offers

The Streamlined Foreign Offshore Procedures are the IRS's route back for people living abroad whose failure to file was non-wilful. The package is fixed: the three most recent years of federal tax returns, six years of FBARs, and a signed certification explaining why the failure was not wilful.

In exchange, the penalties that would otherwise apply — failure to file, failure to pay, and the FBAR penalties that can otherwise reach into eye-watering territory — are waived entirely. You pay any tax actually due plus interest, which for most people in the UK is little or nothing once foreign tax credits are applied.

The word that matters: non-wilful

Non-wilful means negligence, inadvertence, mistake, or a good-faith misunderstanding of the law. Most people qualify comfortably. But the certification is a sworn statement, not a formality, and it is the part of the submission that deserves the most care.

It should be specific and honest: when you left, what you understood, what prompted you to look into it. Vague or boilerplate certifications draw scrutiny. Untrue ones are a different category of problem altogether — where the facts suggest wilfulness, streamlined is the wrong programme and a different route is needed.

Streamlined is only available before the IRS contacts you. That is the whole clock.

Why waiting is the risk

Under FATCA, UK banks and investment platforms identify US-person account holders and report them, via HMRC, to the IRS. That information exchange already runs. If a letter arrives before your submission does, the streamlined door closes and the remaining options are markedly worse.

What the process actually looks like

• A scoping review first: how many years, what assets, whether streamlined is even the right route.
• Document gathering — UK payslips, P60s, bank and pension statements for the relevant years.
• Three years of returns prepared with foreign tax credits or the exclusion applied.
• Six years of FBARs filed electronically.
• The certification drafted with you, not for you.

Most cases run six to ten weeks end to end, and the majority finish with no US tax to pay. What people describe afterwards is not relief about money. It is relief about not having to think about it anymore.