Behind on US Taxes After Receiving a Foreign Windfall? How Streamlined Filing Works

If you are behind on U.S. taxes, or are receiving a foreign windfall — a UK inheritance, a large gift, a premium-bond win or a business-sale payout — the fix is usually the IRS Streamlined Filing Compliance Procedures: file three years of returns and six years of FBARs, add any missed Form 3520, and, if you qualify as non-wilful and non-resident, pay zero penalty.

A sudden lump sum has a habit of bringing old obligations to light. A relative in Yorkshire dies and leaves you £400,000. A family member gifts you the deposit for a London flat. Premium Bonds finally pay out, a legal claim settles, or you sell a stake in a UK company and the proceeds land in a Barclays account.

For a US citizen or green card holder living in Britain, that money is welcome — but it also raises a question you may have been avoiding: are your US filings actually up to date? Washington taxes its citizens on worldwide income, no matter where they live, and a windfall is often the moment when years of quiet non-compliance become impossible to ignore.

Why is being behind on US taxes, receiving a foreign windfall, surfacing now

Most people who fall behind never made a deliberate choice to do so. They moved abroad, assumed HMRC was the only tax authority that mattered, and never realized the United States expects a return every year regardless of residence. The windfall changes the maths in two ways. First, the money almost always lands in a UK account, which can push your combined balances over reporting thresholds you previously slipped under.

Second, banks now share data: under the Common Reporting Standard and FATCA, UK institutions report US-linked account holders to the IRS. Large, sudden deposits are exactly what trigger a second look. Acting before the money filters through the banking system — rather than after a letter arrives — is what keeps you inside the penalty-free options.

The good news is that, being behind on US taxes, receiving a foreign windfall is one of the most fixable positions in cross-border tax, provided you move first. The IRS built the Streamlined Filing Compliance Procedures for precisely this taxpayer: someone whose failure to file was innocent rather than deliberate. Our guide to the Streamlined Foreign Offshore Procedures walks through the mechanics in detail.

What each type of windfall means for your US return

The single most important distinction is between receiving the money and earning income on it. A gift or inheritance is generally not taxable to you as the recipient in the US — but it can carry a heavy reporting duty. The money the windfall generates, and the gains you realize, are a different story entirely.

Windfall type

US tax on the receipt?

Key US reporting

Foreign inheritance or gift over $100,000

No US tax on the receipt itself

Form 3520 (informational)

UK lottery / Premium Bond win

Yes — taxable as ordinary income in the US

Reported on Form 1040

Business-sale payout

Yes — capital gain

Schedule D / Form 8949

Crypto disposal gain

Yes — capital gain

Digital-asset rules apply

Legal settlement

Depends on what it compensates

Case-by-case

Interest/dividends the windfall earns

Yes — taxable each year

Schedule B

UK Premium Bond prizes and most lottery wins are entirely tax-free under HMRC rules, and a UK inheritance falls under the UK inheritance tax regime, paid by the estate, not by you. Neither fact carries over to the US side. The US does not tax you on receiving an inheritance, but it very much taxes a premium-bond prize as ordinary income and a crypto or business sale profit as a capital gain. Our note on foreign inheritance and US tax unpacks where the two systems diverge.

The reporting of a foreign windfall triggers.

Three information returns do most of the work here, and a windfall can trigger all three in a single year.

Form 3520 — the one that bites hardest

If you receive gifts or bequests from a non-resident foreign person or a foreign estate that together exceed $100,000 in a tax year, you must report them on Form 3520. There is no tax on the receipt — this is purely informational — but the late-filing penalty is severe. Under IRC section 6039F, the IRS can charge 5% of the unreported amount for each month of delay, up to a maximum of 25%.

On a £400,000 inheritance, that is a potential penalty near six figures for a form that carries no actual tax. Reasonable-cause relief exists but is hard to establish after the fact, which is why folding a missed Form 3520 into a Streamlined submission matters so much. Our deeper explainer on Form 3520 for foreign gifts and inheritances covers the mechanics of Part IV.

FBAR and Form 8938 — the account side

The moment your combined foreign account balances top $10,000 at any point in the year, you owe an FBAR (FinCEN Form 114) — and a large windfall almost guarantees you'll cross it. Whether the account earns anything is irrelevant; the balance alone creates the duty. On top of that, Form 8938 reports specified foreign financial assets once you pass higher thresholds — for filers abroad, generally $200,000 at year-end or $300,000 at any point.

The two forms overlap but are not interchangeable, and missing either carries its own penalties. Our breakdown of FBAR penalties shows what is at stake if these lapse.

How Streamlined Filing brings you current

The Streamlined Filing Compliance Procedures come in two flavors, and which one applies to you turns on where you have been living.

SFOP (Foreign)

SDOP (Domestic)

Who qualifies

Meets the non-residency test (broadly, lived abroad)

US residents who fail the residency test

Miscellaneous penalty

0%

5% of the highest aggregate asset value

Certification form

Form 14653

Form 14654

Returns required

3 most recent years

3 most recent years

FBARs required

6 years

6 years

A US citizen living in the UK will usually qualify for SFOP, which carries no penalty. You file the three most recent delinquent or amended returns, six years of FBARs, and a signed Form 14653 certifying that your past failure was non-wilful. Crucially, any missed Form 3520 is filed alongside the package rather than left exposed on its own.

For anyone behind on US taxes who receives a foreign windfall, this is the difference between a clean, penalty-free catch-up and open-ended exposure to stacked information-return fines.

Non-wilfulness is the eligibility crux.

The IRS defines it as conduct arising from negligence, inadvertence, mistake, or good-faith misunderstanding of the law — not a deliberate attempt to hide money.

The March 2025 revision of Form 14653 asks you to explain, under penalty of perjury, exactly why you fell behind. A well-drafted narrative that honestly reflects your circumstances is the single most important part of the filing, and it is where professional help earns its keep.

Gathering the paperwork is the other half of the job. Six years of FBARs mean reconstructing the highest balance on every UK account — current accounts, ISAs, pensions, and the windfall account itself — for each year, often from statements banks no longer keep on hand.

The three tax returns need your UK income, any HMRC tax paid for the Foreign Tax Credit, and a defensible valuation of the inheritance or gift as of the date you received it. Starting this record-gathering early matters because a streamlined package is only as strong as the numbers behind it, and gaps invite exactly the follow-up questions the procedure is meant to avoid.

Foreign tax credits soften the income side.

Where the windfall generates US-taxable income — a premium bond prize, dividends on invested proceeds, or a gain you also reported to HMRC — you are rarely taxed twice. The Foreign Tax Credit on Form 1116 lets you offset US liability with UK tax already paid on the same income. In many cases, that credit wipes out the US bill entirely, leaving only the filing obligation rather than a cash cost. Our walkthrough of the Foreign Tax Credit and Form 1116 explains how the limitation is calculated.

Case study: a Leeds inheritance that woke up five dormant years

Take "James", a dual US-UK citizen who moved to Leeds in 2016 and, like many, stopped thinking about US taxes once he settled into a British job and paid HMRC every year. In 2025, his aunt died and left him £380,000, which landed in his NatWest account. Within weeks,s his bank flagged the deposit under its FATCA due diligence checks. James had not filed a US return in five years and had never heard of an FBAR.

Anyone in James's shoes — behind on U.S. taxes, es receiving a foreign windfall — has a narrow but genuine window. Because he had been resident in the UK throughout and his lapse was plainly non-wilful, he qualified for SFOP. We prepared three years of returns, six years of FBARs, a Form 3520 for the inheritance, and a Form 14653 narrative.

Foreign tax credits covered the modest US tax on his UK investment income, so his out-of-pocket US tax was close to nil. The alternative — waiting until the IRS wrote to him — would have taken SFOP off the table and put a 25% Form 3520 penalty of up to roughly £70,000 back on the menu.

Talk to TaxYork before the money moves.

If a foreign windfall has just landed and your US filings are behind, the sequence matters more than the size of the sum. Get advice before the funds cascade through accounts and before any IRS contact, and the penalty-free route usually stays open. TaxYork specializes in exactly these US-UK catch-ups. Email hello@taxyork.com, call 020 3488 8606, or visit taxyork.com to book a confidential review.