Reporting a UK SIPP: Form 8938, the FBAR and What Each One Wants

Reporting a UK SIPP is a Form 8938 question first: a self-invested personal pension is a foreign pension plan, and the IRS says to report your interest in it if your specified foreign assets exceed the threshold. The FBAR position is less settled, and most advisers report the pension there too. US tax on UK pensions starts here.

The confusion is understandable. The two forms overlap without matching, they are filed with different agencies on different systems, and the IRS comparison table does not answer the pension question at all — which is precisely why so many returns get it wrong in one direction or the other.

Reporting a SIPP on Form 8938

The Form 8938 instructions are direct about pensions: report your interest in a foreign pension plan or foreign deferred compensation plan in Part VI, and do not separately report the assets held inside the plan. One line covers the whole SIPP, however many funds sit within it.

Valuation follows the same logic. The maximum value is the fair market value of your beneficial interest in the plan assets on the last day of the tax year. Where that value is genuinely not knowable from readily accessible information, you may use the value of distributions received during the year, or zero if there were none.

The thresholds for people living abroad are generous: more than $200,000 at year end or $300,000 at any point for an unmarried filer, and $400,000 or $600,000 for a joint return. They are far lower for Americans living in the United States, which catches people in the year they move home.

The FBAR question nobody answers cleanly

The FBAR threshold is much lower — more than $10,000 aggregated across all foreign accounts at any point in the year — and the IRS's own comparison of Form 8938 and FBAR requirements lists many asset types without listing foreign pensions among them. The filing mechanics are on the IRS's FBAR page.

What is clear is that FinCEN's definition of a reportable financial account is broad, and a SIPP is an account in your name with a UK financial institution over which you choose the investments. Most cross-border practitioners therefore include it, on the basis that the cost of reporting an account that did not need reporting is nothing, while the cost of omitting one that did is a penalty.

What goes on which form

Filing one does not excuse the other. Form 8938 is attached to the tax return and follows its extended due date; the FBAR goes to FinCEN and is due 15 April with an automatic extension to 15 October. The wider differences are set out in FBAR versus Form 8938.

Reporting is not the same as being taxed

Neither form taxes anything. What happens to growth inside the SIPP is a treaty question, and Article 18(1) of the US–UK treaty is the provision that defers US tax on income accruing in a UK pension scheme until it is paid out.

Employer and employee contributions are a separate matter again, handled under Article 18(5) and explained in UK pension contributions and US tax. The point to hold on to is that a correctly reported SIPP is not a taxed SIPP.

What about the funds inside it?

UK collective funds held in an ordinary account are passive foreign investment companies, with the punitive regime and Form 8621 that goes with them — see PFIC rules for Americans. The analysis is different for funds held inside a pension, and it is fact-specific enough that it should be looked at rather than assumed.

Either way, Form 8938 does not want them listed. You report the pension, not its contents.

If you have missed years

Unreported pensions are one of the most common reasons Americans in Britain end up behind. Where the failure was non-willful, the Streamlined Foreign Offshore Procedures allow three years of returns and six years of FBARs to be filed with the penalties waived, covered in the Streamlined Foreign Offshore Procedures.

• List every UK pension you hold, including small pots from old employers.
• Get the year-end value in sterling, then translate it at a consistent rate.
• Record the peak balance for every other account for the FBAR.
• Report the pension as one interest, not fund by fund.
• Check the threshold that applies to you — it changes the year you move back to the US.

Tranzesta files the pension reporting alongside the treaty positions, so the SIPP is disclosed without being taxed. Book a consultation if your pensions have never appeared on a US return. The reporting rules sit within FBAR and FATCA reporting.

Frequently Asked Questions

Do I have to report a UK SIPP on Form 8938?

Yes, if your specified foreign financial assets exceed the threshold that applies to you. The Form 8938 instructions tell you to report an interest in a foreign pension plan in Part VI and not to separately report the assets held inside it, so the whole SIPP is a single entry regardless of how many funds it holds.

Should a UK pension go on the FBAR?

The IRS comparison table does not address foreign pensions, so the position is not free from doubt. Most cross-border practitioners report a SIPP or personal pension where it is an identifiable account with a UK provider, because including it creates no tax and no downside, while omitting a reportable account risks a penalty.

How do I value a SIPP for Form 8938?

Use the fair market value of your beneficial interest in the plan assets on the last day of the tax year. If that value is genuinely not knowable from readily accessible information, the instructions allow you to use the value of distributions received during the year, or zero where you received none.

Does reporting my pension mean the US will tax it?

No. Form 8938 and the FBAR are information returns and impose no tax. US tax on growth inside a UK pension is deferred under Article 18(1) of the US–UK treaty until benefits are paid, and distributions are then taxed under the treaty and domestic rules that apply at that time.

What is the penalty for leaving a pension off these forms?

Failure to file Form 8938 carries a penalty of $10,000, rising with continued failure after IRS notice. A non-willful FBAR violation can attract a penalty of up to $10,000 per violation, adjusted for inflation, with far higher penalties where the failure was willful.

Do UAE end-of-service benefits work the same way?

Broadly, they raise the same question in a different setting. An end-of-service gratuity or a UAE workplace savings scheme is generally a foreign deferred compensation arrangement for Form 8938 purposes, but with no US–UAE income tax treaty there is no equivalent of Article 18 to defer the US tax on growth.