The route for people who knew, and did nothing about it

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

Most people who have not filed an American return from Britain genuinely did not know they had to. For them the streamlined route exists, and it works well.

Some people did know. They read something years ago and chose to leave it, and the file has grown heavier every year since.

Streamlined filing asks you to sign that your conduct was not wilful, under penalty of perjury. Voluntary disclosure is the route for anyone who cannot sign that.

Key takeaways

• Streamlined filing requires a signed certification of non-wilful conduct.
• Where conduct was wilful, that certification cannot honestly be made.
• The voluntary disclosure practice runs through the criminal investigation function.
• It offers protection from prosecution rather than a reduced penalty regime.
• The financial cost is considerably higher than the streamlined route.
• Timing matters, because the door closes once an enquiry begins.

What is the voluntary disclosure practice?

It is a formal route for people whose failure to file was wilful. The criminal side of the IRS runs it, not the ordinary compliance teams. Per IRS guidance, it offers a way to settle the past while you remain eligible. It does not promise immunity.

It exists because the alternative for these cases is prosecution.

So the benefit is not a discount. It is a different category of outcome.

What does wilful actually mean?

It means you knew about the duty and chose to ignore it. That is not the same as being careless. You need no clever scheme and no offshore trust. Someone who read about the rule, saw that it applied, and did nothing can meet the test.

Wilful blindness counts too, where somebody deliberately avoided finding out.

The line is genuinely difficult, and it is where the real advice sits.

How does it differ from streamlined filing?

Almost entirely. Streamlined filing has a fixed penalty and a signed statement about your conduct. Voluntary disclosure is a case you negotiate with the criminal side. It looks back further, and the penalty reflects what you did.

One is a form-filling exercise with a narrative. The other is a case.

Our guide to streamlined filing explained covers the simpler route.

The two routes compared

A worked example

The figures below are illustrative and use round numbers to show the mechanics.

David, an American in London, learned about his filing obligation in 2014 from a colleague. He looked into it once, decided the risk was low, and filed nothing for a decade while building a portfolio worth £900,000.

He cannot certify non-wilful conduct, because he knew. Streamlined filing is closed to him however attractive its terms look.

The voluntary disclosure route means six years of returns and reports, a substantial penalty on the highest account balance, and a professional engagement that runs for months rather than weeks.

What does it cost?

Much more than the streamlined route. Expect tax and interest on six years, plus a penalty based on your highest total account value across that window, which for most people is the largest single number in the whole exercise.

Expect penalties on the tax as well. Fees run high, because the work is heavier and it lasts longer.

You negotiate the figure inside a set framework.

It still beats the outcome it exists to prevent.

What are the stages?

First comes a preclearance request, asking whether you qualify at all. If they accept it, you make a full disclosure. An examiner then works through the years and agrees the numbers. The whole thing runs for months.

Preclearance is a filter rather than a formality.

Nothing is final until the closing agreement is signed at the end.

Nobody should start the process without advice already in place.

Can anyone be turned away?

Yes, which is why timing matters so much. You cannot use it once an audit has begun. Nor can you use it after a criminal referral, or where the money came from crime. An open enquiry shuts the door.

Information arriving from a foreign bank can also end eligibility before you act.

British banks report American account holders automatically now, so the clock is not yours.

British banks report American account holders automatically now.

What about the quiet route?

Filing back returns outside a programme is the worst option of all. It gives you no cover. It flags the years clearly. And it can turn a fixable case into a hard one.

Our guide to quiet disclosure risks sets out why.

It also wastes the one advantage you still hold, which is coming forward first.

We see it attempted most by people hoping to avoid a difficult conversation.

How do you decide which route applies?

Honestly, with advice, before you file a thing. The question is what you knew and when. An adviser usually sees that more clearly than you do. Neither hope nor guilt is a good guide here.

Many people who fear they were wilful genuinely were not.

Others assume they are safe, and the facts say otherwise.

How long does the whole thing take?

Months, and often more than a year. Preclearance alone can take several weeks. The full disclosure follows that, and then an examiner works through six years of figures with you before anything is agreed.

Plan the cash as well as the time.

The bill lands at the end, not the start.

Can you stay in Britain throughout?

Yes. The whole process runs on paper and by post, so nobody needs to fly anywhere at all. Your adviser deals with the IRS on your behalf from here, and most clients never speak to an examiner.

Most clients never speak to an examiner.

That is one of the few easy parts of this.

What if the amounts are small?

Then the choice matters even more. A small account with wilful conduct still bars you from the streamlined route. But the penalty base is small too, so the gap between the two routes narrows.

Get the conduct question answered anyway.

Guessing is the expensive part here.

How to approach it

1. Say nothing to the authorities until you have taken advice.
2. Gather the account statements and tax records you still hold.
3. Write down what you knew about the obligation and when.
4. Have an adviser assess whether the conduct was wilful.
5. Confirm nothing has already started that would end eligibility.
6. Choose the route and submit the preclearance request if applicable.
7. Budget for a process measured in months rather than weeks.

Does legal privilege matter here?

It can matter a great deal. What you tell an accountant has far weaker cover than what you tell a lawyer. In a case that might turn criminal, that gap is not academic.

Many advisers work under instruction from a lawyer for exactly this reason.

Raise it at the first meeting rather than the third.

Ask about the arrangement at the first meeting rather than the third.

What happens to the British side?

It runs on its own track. British returns may need fixing too, if income went unreported here. HMRC has its own disclosure routes. The two systems do not talk to each other.

Most people in this position were tax compliant in Britain all along.

Where they were not, both need handling together.

Is it ever better to do nothing?

Almost never, and waiting gets worse each year. Account data now flows between the two countries by default, so the information reaches America whether you file or not. Serious tax debt can also reach your passport.

Our guide to renouncing US citizenship explains why renunciation does not clear past years either.

The years do not improve while they sit there.

Who should be in the room?

A cross-border tax adviser who has run these cases, and usually a lawyer alongside. The lawyer protects the conversation, and the adviser builds the numbers and the narrative that go with it.

One person rarely covers both jobs well.

Ask how many of these they have actually completed.

What does the narrative need to say?

The truth, set out plainly and in order. When you learned about the duty, what you did next, what you told advisers, and why the years went unfiled. Vagueness reads badly here.

Documents matter more than adjectives.

Write it once, carefully, with the documents beside you. Rewriting it later looks like a change of story.

A dated email from 2015 carries more weight than a paragraph of regret.

Can you change route part way?

Not easily, and you should not plan on it. Entering one programme and switching to the other looks poor, and a certification you have already signed cannot be unsigned afterwards.

So the first decision is the important one.

Take the second opinion before you file, not after.

Spend the time there rather than on the forms.

Does it clear the British position too?

No. It settles the American years only, and HMRC neither sees the outcome nor takes it into account. If British income went unreported, that needs its own disclosure on its own timetable.

Most people in this position filed correctly in Britain throughout.

Where they did not, run the two together rather than one after the other.

What happens to your future filings?

You join the system properly and file every year from then on. That is the point of the exercise, and a lapse afterwards undoes much of the goodwill the disclosure earned you.

Build the annual filing into your routine straight away.

Our guide to US tax deadlines for expats sets out the dates.

Does it affect your green card or passport?

It can help rather than hurt. Coming forward and settling removes the compliance problem that sits behind most immigration and passport questions, and a resolved file reads very differently from an open one.

An unresolved debt is the version that causes trouble.

So the disclosure usually improves that position rather than damaging it.

Take immigration advice separately, since the two systems follow different rules.

Mistakes and penalties we see with voluntary disclosure

The first is choosing the streamlined route because the terms are better. The certification is the gate, not the cost.

The second is filing something before taking advice. It can close options that were open that morning.

The third is waiting for a letter. A letter ends eligibility rather than starting a conversation.

The fourth is under-documenting the narrative. The account of what happened carries real weight.

How US UK Tax Accountants helps

We assess the conduct question first, because it decides everything that follows, and we work alongside a lawyer where privilege matters. Then we prepare the years, build the narrative, and handle the process through to agreement.

Where the facts genuinely support the simpler route, we say so. Our streamlined filing service covers that work.

If you have years outstanding and you knew about them, get in touch. The conversation is confidential and the position only narrows with time.

Last reviewed 30 September 2026. This article is general information and not personal tax advice. Every case turns on its own facts, so take advice on yours before filing anything.