Your UK company and the streamlined procedures: Form 5471, GILTI and the 2017 lookback

Figures relate to tax year 2023-2025 streamlined window · 2026-27 (UK)

Yes. If you own a UK limited company and never filed Form 5471, the missing forms go inside your streamlined filing Form 5471 package, attached to each of the three returns you file. So the company is not a separate problem. It is part of the same catch-up.

But a company changes the shape of that catch-up. Profits left in the business at the end of 2017 may need reporting, signing on the business bank account as a director usually puts it on your FBAR, and UK corporation tax at 19% or 25% decides how much American tax the retained profit draws. Also, each missing form carries its own $10,000 penalty.

This guide is for an American in Britain who runs a trading company, owns most or all of the shares, and has only just heard of Form 5471. It draws on the IRS instructions for Form 5471 dated December 2025 and the current streamlined pages on irs.gov.

Key takeaways

• If the company held untaxed profits at the end of 2017, the submission must reach back for the section 965 transition tax.
• Profits from years before the window do not become previously taxed just because you file now.
• Six years of FBARs should list the company's business accounts you can sign on as a director.
• UK profits taxed at 25% clear the 18.9% high-tax line for GILTI; the 19% small profits rate only just does.
• A streamlined filing Form 5471 submission removes the $10,000 per company per year penalty, but only if your failure was non-willful.
• A missing Form 5471 can leave the period for assessment open under section 6501(c)(8).
• If you reported all your income, a different IRS route usually fits better.

Does the 2017 transition tax pull in older years?

Yes, if the company held untaxed profits at the end of 2017. The IRS page on streamlined filing and section 965 says the submission must include the year the transition tax arose, generally 2017 and/or 2018, even outside the usual three years. You then file every year from then to the present.

For a submission in late 2026, that could turn a three-year case into one covering 2017 to 2025. The IRS also says streamlined filers cannot choose to pay section 965 tax in instalments. So you pay the full amount, with interest, alongside the submission.

Also, the returns need a second red heading. The IRS asks for "Section 965" after the streamlined heading on each return and each information return. That helps the IRS route the files, and it signals the reason for the longer lookback.

What about profits from years before the submission?

Earlier untaxed profits do not become tax-free just because they fall outside the window. The IRS says a streamlined submission does not automatically give you previously taxed earnings and profits, known as PTEP, for earlier years. Only amounts you have actually included in income count.

For example, suppose your company earned Subpart F income in 2015 that nobody reported. That income is not PTEP. So if the company later pays those profits out to you, they may count as a taxable dividend, even though nobody reopens the older year.

Most generic streamlined guides skip this detail. For a company owner, though, it shapes how and when you take money out after the catch-up. Schedule P of Form 5471 tracks these balances, so it needs care from the first year you file.

Do the company's bank accounts need FBARs?

Often, yes. According to FinCEN, an American with a financial interest in, or signature authority over, foreign accounts must file an FBAR when the total exceeds $10,000 at any time in the year. As a director who can sign on the business account, you usually hold signature authority even though the money belongs to the company.

The IRS example on section 965 makes this point directly. Its illustrative owner had never reported her signature authority over accounts, including those of her own company. So your six years of FBARs should list the company accounts alongside your personal ones.

When you file, choose "Other" as the reason for filing late and enter "Streamlined Filing Compliance Procedures" in the box. Our guide to signature authority rules explains the edge cases.

What goes on Schedule I-1, and why does GILTI matter?

Schedule I-1 reports the figures behind your global intangible low-taxed income, known as GILTI. It covers the company's tested income, tested loss and qualified business asset investment. Those figures then pass to Form 8992, which works out how much of the company's profit you include in your own income.

For a UK trading company that pays out little in dividends, GILTI is often the item that creates American tax. Your return picks up the profit even if it stays in the company. Our article on GILTI for UK company owners works through the calculation.

There is some relief built in. The Form 5471 instructions refer to income taxed above 90% of the top rate in section 11, which is 21% for corporations, so 18.9%. UK profits taxed at the 25% main rate for 2026-27 clear that line, while the 19% small profits rate only just does. The high-tax exclusion is an election, so you need to make it properly in the late returns.

Do delinquent Forms 5471 go into the streamlined package?

Yes. According to the IRS instructions for the Streamlined Foreign Offshore Procedures, you file each of the three returns together with all required information returns, and the IRS names Form 5471 as an example. You attach them to the Form 1040 or 1040-X, just as you would have done on time.

In practice, you file one Form 5471 per company for each of the three years. If you own two UK companies, that means six forms. Each one carries the red heading "Streamlined Foreign Offshore" at the top, in the same way as the returns themselves.

Then you attach a copy of your signed Form 14653 to each return and each information return. So a three-year case with one company has at least six documents carrying that certificate. Our guide to Form 14653 certification covers how to write the narrative.

Which years and forms make up the package?

For a submission in late 2026, the three tax years are usually 2023, 2024 and 2025, because the due date for 2025 has passed. FBARs cover the six most recent years whose due date has passed, so normally 2020 to 2025. A section 965 case reaches back further.

Also, the package goes by post. The IRS says you must send the returns and payment on paper to its Austin address for streamlined foreign offshore cases. It does not accept this part electronically.

What does Form 14653 need to say about the company?

It must certify that you are eligible, that you have filed all FBARs, and that your failures were non-willful. The IRS defines that as negligence, inadvertence, mistake or a good faith misunderstanding of the law. For a company owner, the narrative should name Form 5471 and explain why you did not file it.

Company owners face a harder test than people with a single savings account. You may have had a UK accountant, filed company accounts and dealt with Companies House each year. So the IRS can ask why nobody raised the American side. Our guide to non-willful conduct covers the factors in more depth.

In our practice, the strongest statements give dates: when you formed the company, who prepared its accounts, what advice you had, and how you found out. Then sign the original and attach copies to every return and every Form 5471, but not to the FBARs.

How does streamlined filing Form 5471 penalty relief work?

If you are eligible and follow every instruction, the IRS page says you will not face failure-to-file, failure-to-pay, accuracy-related, information return or FBAR penalties. That covers the $10,000 section 6038 penalty. The relief holds even if a later audit picks up the return, unless the IRS finds fraud or a willful FBAR violation.

However, there are limits. The IRS will not reverse any penalty it has already assessed for those years. So if you already have a Form 5471 penalty on your account, streamlined will not remove it, and you would need to argue reasonable cause separately.

Also, the relief only covers what you submit. If an audit later finds more tax due on a streamlined return, normal penalties can apply to that new amount. So the forms need to be complete, not just present.

What is the $10,000 penalty for a missing Form 5471?

Under section 6038, the penalty is $10,000 for each annual accounting period of each foreign corporation you fail to report. If the IRS then mails a notice and you do not file within 90 days, it adds $10,000 for each further 30 days the failure continues, up to $50,000 more for each failure.

There is a second penalty that people often miss. The Form 5471 instructions say a late or incomplete form also cuts your foreign tax credits by 10%, with a further 5% for each three months after a 90-day notice. So the cost can land on your credits as well as your cash.

Also, the IRS manual explains that the IRS can assess these penalties directly, without the usual 30-day letter. In other words, the bill can arrive before you have had a chance to explain. That is why the route you choose for the late forms matters so much.

Illustrative example: what three missing years could cost

This example is illustrative only, with round numbers. Imagine you own all of a UK consultancy and have never filed Form 5471 for the three years in your streamlined window.

1. Basic penalty: 3 years × $10,000 = $30,000.
2. Continuation penalty if you then ignore an IRS notice: up to $50,000 per year, so 3 × $50,000 = $150,000.
3. Worst case before credit reductions: $30,000 + $150,000 = $180,000.
4. Foreign tax credit cut: 10% of any credits linked to the company, plus 5% steps after notice.
5. Under a valid streamlined filing Form 5471 submission, the information return penalty is $0, because the procedures waive it for non-willful filers.

So the comparison is stark. The tax owed on a small consultancy may be modest, but the penalty exposure is not. Streamlined does not reduce the tax, but it does take the penalty off the table when the facts support it.

Why does a missing Form 5471 keep the statute open?

Because section 6501(c)(8) says the period for assessment does not close until three years after you give the IRS the required information. The IRS manual adds that a missing or incomplete information return can also extend the time to assess tax on the underlying return, not just the penalty.

Normally the IRS has three years from filing to assess more tax. But if you never filed a Form 5471 for a year, the clock for that year may never start. So a year from a decade ago can, in theory, stay open for as long as the form is missing.

Still, the procedures centre on three years of returns and six years of FBARs. Complete forms for those years start the clock for them. Published IRS guidance does not ask streamlined filers to go further back unless section 965 applies.

Where do Subpart F income and Forms 8992 and 1118 fit?

Subpart F income is mainly passive income, such as interest and some dividends, earned inside the company. It goes on Schedule I and you include it in the year the company earns it. For most UK trading companies it is small, but a company with spare cash on deposit can produce some.

Form 8992 then pulls together the GILTI figures from each company's Schedule I-1. Next comes the foreign tax credit. As an individual, you normally use Form 1116. Form 1118 is the corporate version, so you will see it named in the instructions, but it rarely applies to a personal streamlined case.

So the order of work matters. First convert the company accounts, then complete Schedules I and I-1, then Form 8992, and only then the credit forms. A mistake early in that chain carries through every later form.

Which Form 5471 category is a UK company owner usually?

Usually Category 4 and Category 5 at once. Category 4 applies when an American person controls the company, meaning more than 50% of the votes or value. Category 5 applies when you are a US shareholder, with at least 10%, of a controlled foreign corporation that Americans own more than 50% of in total.

For example, if you own all the shares, you meet both tests. You file one Form 5471, tick both boxes, and complete the schedules each category requires. Our guide to Form 5471 categories goes through each box in more detail.

When do the delinquent information return procedures fit better?

When you reported all your income and paid the tax, but left Form 5471 off. The Streamlined Foreign Offshore Procedures require a failure to report income and pay tax. So if nothing is missing except the forms, streamlined is not the fit, and the delinquent international information return route usually is.

Under that route, you attach the late Forms 5471 to amended returns and may include a reasonable cause statement. However, the IRS page warns that it may assess penalties without first reading that statement. So you may need to answer a notice and argue reasonable cause afterwards.

Neither route is open if the IRS has started a civil examination of any year. Our guide to the delinquent information returns procedure compares the two routes in more detail.

How should you convert the UK accounts for Form 5471?

The instructions set out a specific method. For example, amounts on Schedule E, which covers foreign taxes, generally use the average exchange rate for the year. Whatever the method, you show every rate as pounds per dollar, rounded to at least four decimal places, which the instructions call the divide-by convention.

So you cannot simply copy figures from the UK accounts. Many UK companies use a year end such as 31 March, while your return runs to 31 December. Form 5471 reports the company's own accounting period that ends within your tax year, and American rules adjust items such as depreciation.

Steps to prepare a streamlined filing with Form 5471

1. Confirm you meet the non-residency test: at least 330 full days outside the US and no US abode in one of the three years.
2. Check whether the company held untaxed profits at the end of 2017, which brings in section 965.
3. Collect UK statutory accounts and corporation tax returns for every year in the window.
4. Convert the accounts to dollars and adjust them to US tax principles.
5. Complete each Form 5471, then Schedule I-1, Form 8992 and the credit forms.
6. Prepare the three returns, mark each one in red and attach the forms and copies of Form 14653.
7. File six years of FBARs online, including company accounts you can sign on.
8. Post the package to the Austin address with payment of all tax and interest.

What are the common mistakes with a streamlined filing and Form 5471?

The most common mistakes come from treating the company as a side issue. Each one below can turn a clean submission into one the IRS processes in the normal way, without the penalty relief. So it pays to check the full package against this list before you post it.

• Leaving Form 5471 out of the streamlined filing Form 5471 package and reporting only the bank accounts.
• Missing the section 965 lookback when the company held profits in 2017.
• Forgetting the company's bank accounts on the FBARs.
• Using UK year-end figures without the right exchange rate.
• Writing a Form 14653 narrative that never mentions the company.
• Using streamlined when you reported all your income.
• Assuming old untaxed profits have become previously taxed.

How US UK Tax Accountants helps

We prepare streamlined submissions for Americans in Britain who own UK companies, including every Form 5471, Schedule I-1, Form 8992 and the section 965 lookback where it applies. We work from your UK accounts and corporation tax returns. Our streamlined filing service explains how a case runs from start to finish.

After the catch-up, you will need a Form 5471 every year for as long as you own the shares. Our guide for an American who owns a UK limited company covers that ongoing picture, including how salary and dividends interact with GILTI.

If you own a UK company and have never filed Form 5471, contact us for a review. We will tell you whether streamlined, the delinquent information return route or another option fits your facts before you file anything.

This article is general information, not personal tax advice. Take advice on your own facts before you file.

Last reviewed: 12 November 2026.