What are the Form 8938 valuation rules in simple terms?

They require you to report each specified foreign financial asset at its maximum value during the tax year, which the regulations define as a reasonable estimate of the maximum fair market value of the asset during the taxable year. Financial accounts can be valued from periodic statements. Non-account assets may generally use the last-day value. Every sterling figure is then converted to US dollars using the exchange rate on the last day of the tax year.

What exchange rate do I use for Form 8938 on a UK asset?

The Form 8938 instructions direct you to the US Treasury Bureau of the Fiscal Service foreign currency exchange rate for purchasing US dollars, applied as at the last day of the tax year, even if you disposed of the asset earlier in the year. Another publicly available rate may be used only where no Treasury rate exists, and the source must then be disclosed on the form. HMRC and Bank of England rates are not the reporting convention here.

Do I need an appraisal to value UK private company shares for Form 8938?

No. The IRS states in both the Form 8938 instructions and its published questions and answers that an appraisal by a third party is not necessary to reasonably estimate the maximum value of an asset during the tax year. You still need a reasonable estimate supported by something verifiable: filed accounts, net asset backing, a recent arm's length transaction price, or a funding round price. Any priced event during the year displaces the year-end figure.

How do I report a UK defined benefit pension if I have no transfer value?

The maximum value is the fair market value of your beneficial interest in the plan assets at year end. Where you do not know that value and have no reason to know it from readily accessible information, the maximum value is the cash and other property distributed to you during the year. Where there were no distributions either, the IRS says the value is zero and you should still report the plan showing a maximum value of zero.

Can I use my UK provider 5 April statement for Form 8938?

Not as your reporting figure. GOV.UK confirms the UK tax year runs to 5 April, while Form 8938 works to the US calendar year for individual filers. A 5 April closing value is neither the 31 December position nor the calendar-year high. Request a 31 December valuation from each UK provider, and where only 5 April packs are issued, build the calendar-year maximum from interim quarterly or monthly statements.

How do I fix a year where I missed or mis-valued a Form 8938 asset?

Form 8938 cannot be filed on its own, so the correction is a Form 1040-X with a complete or corrected Form 8938 attached. Where nothing but reporting failed, the IRS Delinquent International Information Return Submission Procedures apply if you are not under examination or investigation and have not been contacted. Where income also went unreported, the Streamlined Foreign Offshore Procedures require three years of returns, six years of FBARs and Form 14653.

Form 8938 Valuation Rules for UK Assets Explained

The Form 8938 valuation rules require you to report, for each specified foreign financial asset, the maximum value of that asset during the tax year, expressed in US dollars. Maximum value means a reasonable estimate of the maximum fair market value of the asset during the taxable year, and the conversion into dollars is made at the exchange rate on the last day of the tax year, not at the rate that applied on the day the asset peaked. The IRS does not require a formal valuation: the Instructions for Form 8938 on IRS.gov state that an appraisal by a third party is not necessary to estimate the maximum fair market value during the year. What the IRS does expect is a defensible figure, supported by statements or verifiable market information, and a working file that shows how every number on the form was built.

What do the Form 8938 valuation rules actually require?

Form 8938 is the annual statement of specified foreign financial assets required by section 6038D. The valuation standard itself sits in the regulations at 26 CFR 1.6038D-5, which sets out three propositions that drive everything else. First, the value of a specified foreign financial asset is its fair market value. Second, the maximum value of a specified foreign financial asset means a reasonable estimate of the maximum fair market value of the asset during the taxable year. Third, for an asset that is not a financial account, the value as of the last day of the taxable year may be used as the maximum value unless the filer knows, or has reason to know based on readily accessible information, that this figure does not reflect a reasonable estimate.

Valuation also decides whether you file at all. The IRS Instructions for Form 8938 set the thresholds for a specified individual living abroad at more than $200,000 on the last day of the tax year or more than $300,000 at any time during the tax year if you are unmarried or married filing separately, and more than $400,000 on the last day of the tax year or more than $600,000 at any time during the tax year for a married couple filing jointly. For a high-net-worth filer in London, those figures are usually crossed by a single pension or a single investment platform. The test that catches people is the any-time-during-the-year limb: a sterling account that was drained in November to fund a property completion still counts at its June high point.

Two mechanical points are easy to miss. If the maximum value of a specified foreign financial asset is less than zero, the instructions direct you to use a value of zero as the maximum value. And once you meet the applicable threshold, you report all of your specified foreign financial assets, including those with a de minimis maximum value during the tax year, which is why a dormant building society account holding a few hundred pounds still earns its own line on the form.

Which UK assets are you valuing, and which sit outside the exercise?

The valuation exercise only bites on assets that are specified foreign financial assets, so classification comes before measurement. In a typical UK holding pattern for an American in the UK, the reportable population usually includes the following.

Current, savings and building society accounts held with UK banks, reported as foreign deposit accounts.
Cash ISAs and stocks and shares ISAs held with UK providers. The UK tax exemption on an ISA changes nothing about either the reporting obligation or the valuation method.
General investment accounts and dealing accounts on UK platforms, reported as custodial accounts.
Interests in UK pension arrangements, including self-invested personal pensions, workplace defined contribution pots and defined benefit entitlements.
Shares in a UK private company held directly rather than inside a UK account, including founder shares and shares acquired under an employee share plan.
Deferred cash and share awards from a UK employer that represent an interest in a foreign deferred compensation plan.
Non-US life assurance and annuity contracts with a cash value.

Equally important is what drops out before you value anything. The IRS confirms that foreign real property is not a specified foreign financial asset required to be reported on Form 8938, and that directly held tangible assets such as art, antiques, jewellery, cars and other collectibles are not specified foreign financial assets. Foreign currency itself is not a specified foreign financial asset and is not reportable. But the IRS is equally explicit that where property is held through a non-US entity such as a corporation or a partnership, the interest in that entity is a specified foreign financial asset that is reported on Form 8938. A Kensington flat owned personally is therefore outside the form, while shares in the UK company that owns the same flat are inside it and have to be valued.

How do you work out the maximum value during the tax year?

Maximum value is a high-water-mark concept, not a year-end snapshot, and the IRS instructions make the point with a worked example. Take publicly traded foreign stock not held in a financial account with a fair market value as of the last day of the tax year of $100,000, where daily price information that is readily available shows a 52-week high trading price producing a maximum value during the tax year of $150,000. The IRS states that the maximum value of the foreign stock to be reported is $150,000, based on readily available information of the maximum value of the stock during the tax year.

The practical consequence for UK holdings is that the quality of the information available to you determines the answer you are required to give. Where the asset is quoted, daily pricing is readily available, so a year-end figure will not do. Where the asset is not quoted and no periodic pricing exists, the regulations allow the last-day value to stand as the maximum value. That asymmetry is deliberate, and it is why a portfolio of London-listed shares held directly is a harder preparation job than an unquoted shareholding of the same size.

For assets that are not held in a financial account, the IRS permits fair market value to be determined from information publicly available from reliable financial information sources or from other verifiable sources. In UK terms that reaches London Stock Exchange pricing, fund manager published prices, platform valuations and provider statements, and it reaches company records where nothing else exists.

Can you rely on periodic statements from a UK provider?

Yes, within limits. The instructions permit you to rely on periodic account statements for the tax year to report the maximum value of a financial account unless you know, or have reason to know based on readily accessible information, that the statements do not reflect a reasonable estimate of the maximum account value during the tax year. The regulations extend the same reliance to the currency conversions shown on statements issued at least annually by the financial institution, which is a useful fallback where a UK provider reports in sterling and dollars.

The reliance is not unconditional, and the condition is where UK filers get into difficulty. Reason to know based on readily accessible information is a low bar when you hold the online banking credentials. If your UK platform issues quarterly valuations and you personally moved 400,000 pounds through the account in the seven weeks between two statement dates, the statements plainly do not reflect the maximum value and cannot be hidden behind. The same applies to a UK employer share plan that reports once a year while the underlying shares repriced twice inside that year.

The reliable preparation habit is to pull statements at the highest frequency the provider offers, and to treat any large in-year movement you already know about as a trigger to obtain a mid-period figure rather than as a reason to accept the statement figure.

Which exchange rate converts a sterling asset into US dollars?

The rule is narrower than most filers expect. The Form 8938 instructions direct you to use the US Treasury Bureau of the Fiscal Service foreign currency exchange rate for purchasing US dollars, and to use the currency exchange rate on the last day of the tax year, even if you sold, closed or disposed of the asset before the last day. The regulations permit another publicly available foreign currency exchange rate only where a Treasury rate is not available, in which case the source of the rate has to be disclosed on the form.

That produces a strict two-step calculation for every sterling asset.

Step one: identify the maximum value in sterling, using the high-water mark during the tax year and the best-frequency evidence available.
Step two: convert that sterling figure to US dollars using the Treasury Reporting Rate of Exchange as of the last day of the tax year, and nothing else.

You do not convert at the rate that applied on the day the asset peaked, and you do not use HMRC or Bank of England rates for this purpose, even though those are the rates sitting behind your UK filings. The Treasury Reporting Rates of Exchange published by the Bureau of the Fiscal Service for 31 December 2025 show the United Kingdom pound at 0.743, expressed as units of sterling per US dollar, so sterling values are divided by that figure: 1,000,000 pounds of maximum value converts to $1,345,895 for a calendar-year 2025 Form 8938. The form itself asks you to state the currency in which the asset is denominated, the exchange rate used, and the source of that rate where it is not the Treasury figure, so an inconsistent or invented rate is visible on the face of the return.

Is an appraisal required for a hard-to-value UK asset?

No. The IRS position appears in two places. The Instructions for Form 8938 state that an appraisal by a third party is not necessary to estimate the maximum fair market value during the year, and the IRS questions and answers on Form 8938 state that you do not need to obtain an appraisal by a third party in order to reasonably estimate the maximum value of the asset during the tax year.

That is a relief provision, not a licence to guess. What replaces the appraisal is the reasonable estimate standard, and a reasonable estimate has to be traceable to something. For a UK asset with no market, the acceptable evidence base is the material a shareholder would use to satisfy themselves of value: filed or audited accounts, the price in the most recent arm's length transaction in the same share class, a subscription price from a funding round, net asset backing, or a formula price set out in the articles of the company or in a shareholders agreement.

The no-appraisal position also cuts the other way in an examination. Because the IRS never asked for an appraisal, a filer cannot argue that valuation was impossible. The question an examiner asks is whether the estimate was reasonable on the information the filer could readily access, which makes contemporaneous documentation the whole exercise.

How do you value a UK defined benefit pension when no transfer value was requested?

This is the single most common valuation gap in UK cases, and the regulations answer it directly. For an interest in a foreign pension plan or a foreign deferred compensation plan, the maximum value is the fair market value of your beneficial interest in the assets of the plan as of the last day of the tax year. If you do not know, and have no reason to know based on readily accessible information, that fair market value, the maximum value is the value of the cash and other property distributed to you during the tax year. And if you neither know the value nor received a distribution, the IRS states that the value of your interest in the plan is zero, and that you should report the plan and indicate that its maximum value is zero.

For a UK defined contribution arrangement none of this is difficult. A self-invested personal pension or a workplace pot produces a statement value, and that figure is the starting point for the high-water-mark test. A UK defined benefit entitlement is a different animal, because the scheme reports an annual pension in payment or a projected pension at normal retirement age, not a fund value attributable to you. Where no cash equivalent transfer value has ever been requested from the scheme administrator, there is no readily accessible fair market value of a beneficial interest in plan assets, which is precisely the fact pattern the regulations contemplate.

The reporting consequence is that the asset is still disclosed. The error that creates real exposure is leaving the scheme off the form entirely on the basis that it has no value you can compute. A defined benefit scheme reported at a zero or distribution-based maximum value, with a contemporaneous note explaining why, is a filed position on the record. An unreported scheme is missed reporting, and it holds the year open.

Valuing illiquid sterling-denominated private company shares

For a founder, an investor or an investment banker holding shares in a UK company outside any account, the regulations give a starting point that is often more generous than expected. The value as of the last day of the taxable year may be used as the maximum value of the asset unless you know, or have reason to know based on readily accessible information, that this does not reflect a reasonable estimate of the maximum value during the year. There is no obligation to reconstruct an in-year high for an asset that was never priced in-year.

What defeats that position is a priced event. If the company completed a funding round in July at a share price well above the December position, or if a secondary sale of the same class took place, that pricing information is readily accessible to a shareholder and the year-end figure stops being a reasonable estimate of the maximum. The same logic applies to an earn-out revaluation, a buy-back at a stated price, or a formal offer for the company made and lapsed inside the year.

Two adjacent points matter here. Sterling denomination does not soften the exchange rate rule: the year-end Treasury rate applies to a shareholding that has not traded all year exactly as it applies to a bank balance. And a controlling or substantial interest in a UK company frequently brings a separate Form 5471 obligation, with its own balance sheet, functional currency and translation conventions, which are not the same conventions as the Form 8938 valuation rules. Filers who lift a figure from Form 5471 and drop it onto Form 8938 usually produce the wrong number. Where the shares sit inside a UK account instead, reporting happens at account level, and HMRC filings such as an employment-related securities annual return can be a useful cross-check on the price you relied on.

Why the FBAR maximum value and the Form 8938 valuation rules are not the same exercise

Both forms ask for a maximum value, and both can be prepared from a single sterling data set, but they are not one exercise and the answers can legitimately differ for the same UK account. The differences that matter in preparation are these.

Different populations. The FBAR reports foreign financial accounts. Form 8938 reports specified foreign financial assets, which includes accounts but also non-account assets such as directly held shares in a UK company and interests in a foreign deferred compensation plan. A private shareholding has no FBAR line at all.
Different filing tests. The IRS states that the FBAR is triggered where the aggregate value of foreign financial accounts exceeded $10,000 at any time during the calendar year reported. Form 8938 uses the much higher thresholds for filers living abroad and is filed with the income tax return rather than separately.
Different deadlines. The IRS states that the FBAR is an annual report due 15 April following the calendar year reported, with an automatic extension to 15 October that does not need to be requested. Form 8938 follows the income tax return and its extensions.
No substitution either way. The IRS is explicit that filing Form 8938 does not relieve you of the separate requirement to file the FBAR if you are otherwise required to do so, and vice versa.

The valuation consequence is that a UK current account can appear on both forms with the same peak sterling balance and still be worked differently, because the Form 8938 line sits inside an aggregate test that also captures pensions, unquoted shares and deferred awards, and because the Form 8938 currency convention is fixed by the instructions to the last day of the tax year regardless of when the account peaked or closed. Preparing both forms from one dataset is efficient. Assuming they ask the same question is how a single mis-valuation propagates across two filings and two penalty regimes.

The 5 April problem: UK statements against a US calendar year

Every UK provider is built around a tax year that GOV.UK describes as running from 6 April to 5 April, with the current UK tax year being 6 April 2026 to 5 April 2027. Form 8938 is built around the US tax year, which for an individual filer is the calendar year. Nothing reconciles the two for you, and no UK provider will do it unprompted.

The failure mode is predictable. A filer collects the annual pension statement or the consolidated tax certificate a UK provider issues for the year to 5 April, reads the closing figure, and reports it as the maximum value for the calendar year. That figure is neither the 31 December value nor the calendar-year high. It is a 5 April number, and in a rising or falling market it can be wrong by a material margin in either direction. Two habits remove the problem.

Request a 31 December valuation from every UK provider as a standing instruction, rather than accepting the 5 April pack as the reporting evidence.
Where a provider will only issue statements to 5 April, obtain the interim quarterly or monthly valuations and build the calendar-year high from those, retaining the printouts in the file.

The same discipline applies to ISA records. GOV.UK confirms that in the 2026 to 2027 tax year the maximum you can save in ISAs is 20,000 pounds. That is a UK tax-year subscription limit and it tells you nothing about the calendar-year maximum value of the account, so it should never be used as a proxy for the reported figure.

Worked example: valuing a UK asset set for one Form 8938

The following is an illustrative example only, using the verified Treasury Reporting Rate of Exchange for 31 December 2025 of 0.743 units of sterling per US dollar. Assume a married couple filing jointly, both US citizens resident in London, preparing a calendar-year 2025 Form 8938 for the following UK assets.

A UK current account: year-end balance 42,000 pounds, peak balance 180,000 pounds in June before a property completion. Maximum value reported is 180,000 pounds, which converts to $242,261.
A stocks and shares ISA on a UK platform: year-end 310,000 pounds, with quarterly statements showing a November high of 335,000 pounds. Maximum value reported is 335,000 pounds, which converts to $450,875.
A self-invested personal pension: provider statements show a high of 1,265,000 pounds against a year-end value of 1,240,000 pounds. Maximum value reported is 1,265,000 pounds, which converts to $1,702,557.
A 12 per cent holding in an unquoted UK trading company held directly: no priced event during the year, with a year-end value of 600,000 pounds supported by filed accounts and net asset backing. Maximum value reported is 600,000 pounds, which converts to $807,537.
An unvested deferred cash award from a UK employer: notional value at 31 December of 250,000 pounds. Maximum value reported is 250,000 pounds, which converts to $336,474.

The aggregate maximum value is approximately $3,539,704, comfortably past the thresholds for filers living abroad, and each of the five assets earns its own detailed line stating the currency, the rate of 0.743 and the fact that the rate came from the Bureau of the Fiscal Service. Change one fact, a July funding round pricing the company shares at 900,000 pounds, and the fourth line has to change, because pricing information for the same share class became readily accessible to the shareholder during the year and the December figure is no longer a reasonable estimate of the maximum.

How do you fix a year where an asset was missed or mis-valued?

There is no standalone amendment route for this form. The IRS states that Form 8938 should not be sent to the IRS unless it is attached to an annual return or an amended return, and that if you omitted Form 8938 when you filed your income tax return you should file Form 1040-X with the Form 8938 attached. A mis-valued asset is corrected the same way, by attaching a corrected Form 8938 to an amended return for the year in question. Which route applies depends on what else went wrong in that year.

Reporting-only failures, with no unreported income and no additional tax. The Delinquent International Information Return Submission Procedures on IRS.gov are available to taxpayers who have identified the need to file delinquent international information returns, who are not under a civil examination or a criminal investigation by the IRS, and who have not already been contacted by the IRS about the returns. The delinquent returns are attached to an amended income tax return, and a reasonable cause statement may be attached to each delinquent return for which reasonable cause is asserted.
Failures accompanied by unreported income. Where UK dividends, ISA income, interest or gains went unreported alongside the missed asset, the Streamlined Foreign Offshore Procedures are the usual route for a non-willful filer who satisfies the non-residency requirement. The IRS requires delinquent or amended returns for each of the most recent 3 years for which the return due date has passed, together with all required information returns including Form 8938 and Form 5471, delinquent FBARs for each of the most recent 6 years for which the FBAR due date has passed, and a signed Form 14653 certifying that the failures resulted from non-willful conduct. The IRS also requires the words Streamlined Foreign Offshore to be written in red at the top of the first page of each return and each information return.

One caution on reasonable cause. The IRS warns on its own page that during the processing of a delinquent information return, penalties may be assessed without considering the attached reasonable cause statement, and that it may be necessary for taxpayers to respond to specific correspondence and to submit or resubmit reasonable cause information. Build the valuation file on the assumption that you will have to produce it twice, and keep the sterling evidence and the rate source with the statement rather than in a separate folder.

What penalties and open years follow a valuation failure?

The instructions set the penalty for failing to file a required Form 8938 on time at $10,000, with an additional $10,000 for each 30-day period, or part of a period, of continued failure after the 90-day mark following IRS notification, subject to a maximum additional penalty of $50,000. No penalty is imposed where the failure is due to reasonable cause and not to willful neglect.

The more expensive consequence for a high-net-worth filer is what happens to the assessment period. The instructions confirm that if you fail to file Form 8938 or fail to report a specified foreign financial asset, the limitation period stays open until 3 years after the date on which you file the form, and that it extends to 6 years where the omitted income is more than $5,000. A single unreported UK pension or shareholding therefore keeps the whole return open, not merely the omitted line, which is exactly why the zero-value defined benefit disclosure discussed above is worth far more than it costs to prepare.

Mis-valuation is treated less mechanically than non-filing, because the governing standard is a reasonable estimate rather than an exact figure. That is precisely why documentation is the defence. A filer who identified a sterling high from quarterly statements, converted at the published Treasury rate for the last day of the year and retained the working papers is defending a reasonable estimate. A filer who typed a year-end figure from memory with no supporting file is defending nothing at all.

A valuation file that survives examination

Preparation quality on this form is almost entirely a records question, and the file can be built once and repeated annually with modest effort. For each UK asset, the working paper should carry the following.

The asset description as it will appear on the form, and whether it is reported as a foreign financial account or as another specified foreign financial asset.
Every statement or valuation obtained for the tax year, at the highest frequency the provider issues, with the 31 December position clearly identified.
The sterling maximum value, the date on which it occurred, and a one-line note of how that date and figure were identified.
The Treasury Reporting Rate of Exchange applied, the source of the rate, and the resulting US dollar figure.
For unquoted holdings, the evidence of value relied on and a positive confirmation of whether any priced event occurred during the year.
For pension interests, whether a fair market value of the beneficial interest was readily accessible, and if not, a record of what distributions, if any, were received.

Assets do not need to be appraised, but they do need to be evidenced, and the evidence has to exist before the IRS asks for it. Filers who maintain this file find that a missed year becomes a mechanical correction rather than a reconstruction project, and that a valuation query from the IRS turns into a document request instead of an argument.