US Expat Tax Services UK Dividends and ISA Reporting |

US Expat Tax Services: UK Dividends and ISA Reporting

US Expat Tax Services for UK Dividend and ISA Income

US expat tax services for Americans in the UK must address two investment income categories that are consistently misunderstood and misreported: UK dividends from shares and all income arising within a UK Individual Savings Account. Both categories are fully taxable in the United States — yet both are commonly omitted from US returns, often because the same income is either tax-free or low-taxed in the UK and the American incorrectly assumes the UK treatment carries over to the US return. Furthermore, the UK ISA is probably the most widely held tax wrapper in the United Kingdom — with millions of Americans holding cash ISAs and stocks and shares ISAs — yet the IRS provides zero recognition of the ISA's tax-free status, meaning every dividend, interest payment, and capital gain arising inside an ISA is US-taxable in the year it arises. Additionally, UK fund investments held within an ISA are typically passive foreign investment companies for US tax purposes, creating Form 8621 election obligations that most non-specialist preparers are entirely unaware of. Consequently, US expat tax services must address ISA income, UK share dividends, and PFIC fund elections as interconnected annual obligations — not as three separate afterthoughts.

UK Dividends: The US Reporting Position

How UK Dividends Are Taxed in the UK

UK dividends from shares held outside an ISA are taxable in the UK above the annual dividend allowance — £500 for the 2025-26 tax year. Furthermore, UK dividend tax rates are 8.75% for basic rate taxpayers, 33.75% for higher rate taxpayers, and 39.35% for additional rate taxpayers. Additionally, dividends within the £500 allowance are not subject to UK income tax — though they must still be disclosed on the UK self-assessment where the total dividend income exceeds £10,000 per year. Consequently, a higher-rate UK taxpayer receiving £8,000 of UK dividends per year pays UK dividend tax of approximately £2,533 — at 33.75% on £7,500 above the allowance. The HMRC dividend tax guidance is at https://www.gov.uk/tax-on-dividends.

How UK Dividends Are Reported on the US Return

UK dividends are reported on Schedule B of Form 1040 as foreign dividend income — converted from sterling to US dollars at the IRS annual average exchange rate for the tax year. Furthermore, dividends from UK companies listed on a recognized stock exchange — including the London Stock Exchange — generally qualify as qualified dividends for US tax purposes, taxed at the preferential rate of 0%, 15%, or 20% rather than the standard ordinary income rate. Additionally, the foreign tax credit for UK dividend tax paid is claimed on Form 1116 in the passive income basket — reducing or eliminating the US income tax on the same dividends where the UK dividend tax rate exceeds the applicable US qualified dividend rate. Consequently, US expat tax services must confirm whether each UK dividend qualifies as a qualified dividend — based on the paying company's stock exchange listing and the holding period conditions — before applying the preferential rate and the Form 1116 credit. The IRS Schedule B guidance is at https://www.irs.gov/forms-pubs/about-schedule-b-form-1040.

Excess Foreign Tax Credits From UK Dividend Tax

Where the UK dividend tax rate — 33.75% or 39.35% for higher and additional rate taxpayers — exceeds the US qualified dividend rate of 0%, 15%, or 20%, excess foreign tax credits arise in the passive income basket. Furthermore, these excess credits carry forward for up to ten years against future passive basket US income tax — providing a useful offset against future years of passive income. Additionally, the excess credit position means that for most UK higher-rate taxpayers receiving UK share dividends, no additional US income tax is due — but the Form 1116 must be completed correctly each year to establish and track the excess credit carryforward. Consequently, failing to prepare Form 1116 for UK dividend income produces either an overclaim or an underclaim of the foreign tax credit — both of which require an amended return to correct and which US expat tax services avoid by including Form 1116 as a standard annual attachment to every return where UK dividend income is received. The IRS Form 1116 guidance is at https://www.irs.gov/forms-pubs/about-form-1116.

The UK ISA: Fully Taxable in the United States

Why the IRS Does Not Recognize the ISA

The UK ISA provides complete UK income tax and capital gains tax exemption on all income and gains arising within the account — but the IRS does not extend any equivalent protection to the ISA for US tax purposes. Furthermore, for the IRS to exempt income within a foreign account from US tax, the account must either be specifically protected by the US-UK tax treaty or fall within a recognized US tax-exempt category — and the ISA meets neither condition. Additionally, the US-UK treaty does not list the ISA among the pension and retirement schemes that receive treaty-based US tax protection. Consequently, every pound of interest earned in a cash ISA, every dividend received in a stocks and shares ISA, and every capital gain arising on fund sales within the ISA is included in the US citizen's gross income in the year it arises — reported on Schedule B or Schedule D as applicable. The IRS guidance on US citizens abroad is at https://www.irs.gov/individuals/international-taxpayers/us-citizens-and-resident-aliens-abroad.

Reporting Cash ISA Interest on Schedule B

Interest earned in a UK cash ISA is reported on Schedule B of Form 1040 as foreign interest income — in the same section as any other UK bank account interest. Furthermore, the ISA interest amount is converted from sterling to US dollars at the IRS annual average exchange rate. Additionally, since the cash ISA generates no UK tax — it is tax-free in the UK — no foreign tax credit is available to offset the US income tax on the ISA interest. Consequently, the US income tax on cash ISA interest is paid in full — without any foreign tax credit reduction — making the ISA one of the few UK income sources that produce a genuine net US income tax liability for UK-based Americans. US expat tax services treat cash ISA interest as a standard Schedule B line item, obtaining the annual interest figure from the ISA provider's end-of-year statement.

ISA Dividends and Capital Gains

Dividends received within a stocks and shares ISA are reported on Schedule B as foreign dividend income — converted at the IRS annual average rate — with no foreign tax credit available since no UK dividend tax is paid within the ISA wrapper. Furthermore, capital gains on the disposal of shares or fund units within the stocks and shares ISA are reported on Schedule D — with the cost basis established at the price paid for the shares or units, since the ISA provides no stepped-up basis treatment for US tax purposes. Additionally, the holding period for preferential long-term capital gains rates runs from the purchase date within the ISA — shares or units held within the ISA for more than one year qualify for the long-term rate on the US Schedule D. Consequently, US expat tax services must obtain the transaction history from the ISA platform annually — including purchase dates, sale dates, proceeds, and cost basis — to accurately prepare the Schedule D for any ISA disposals during the year.

UK Fund Holdings: The PFIC Problem

Why UK Funds Are PFICs

A passive foreign investment company is any non-US corporation that derives 75% or more of its gross income from passive sources or holds 50% or more of its assets as passive investment assets. Furthermore, virtually every UK unit trust, OEIC, and investment trust qualifies as a PFIC — since their income is investment income and their assets are investment assets. Additionally, UK funds held within a stocks and shares ISA are PFICs — the ISA wrapper does not affect the PFIC classification. Consequently, every American who holds a UK fund — whether in an ISA, a general investment account, or a pension — has a PFIC that requires an annual Form 8621 election. The IRS Form 8621 guidance is at https://www.irs.gov/forms-pubs/about-form-8621.

The Mark-to-Market Election: The Correct Approach

The mark-to-market election on Form 8621 is the most commonly used approach for UK fund PFIC holdings — it taxes the annual appreciation in the fund's net asset value as ordinary income each year, avoiding the punitive excess distribution regime that applies by default. Furthermore, the mark-to-market election must be made in the first year the fund is held — late elections require IRS approval. Additionally, the annual mark-to-market income is calculated as the difference between the fund's NAV at the end of the year and the NAV at the beginning of the year — or the purchase price at which the fund was acquired during the year. Consequently, US expat tax services must obtain the year-end and prior-year-end NAVs for every UK fund held annually and prepare a separate Form 8621 for each fund — five UK OEICs in a stocks and shares ISA require five separate Form 8621 filings. The IRS Form 8621 guidance is at https://www.irs.gov/forms-pubs/about-form-8621.

The Excess Distribution Regime: Avoid at All Costs

Where no PFIC election is made on Form 8621, the default treatment — the excess distribution regime — applies to all gains realized on the disposal of fund shares. Furthermore, under the excess distribution regime, the gain is allocated pro rata over the holding period and taxed at the highest applicable ordinary income rate for each prior year in which the shares were held, with interest charges accruing for each year of deferral. Additionally, this treatment is almost always more expensive than either the mark-to-market or qualified electing fund election — particularly for long-held positions where the interest charges compound over many years. Consequently, the mark-to-market election is the standard first-year action for every UK fund holding identified in a US expat tax services engagement — and retroactive elections are available through the streamlined procedures for prior years where the election was not previously made.

FBAR and Form 8938 for ISA Accounts

The ISA as a Foreign Financial Account

Each UK ISA — cash ISA, stocks and shares ISA, and innovative finance ISA — is a separate foreign financial account for FBAR purposes, reportable annually where the aggregate balance of all foreign accounts exceeds $10,000 at any point during the year. Furthermore, the ISA's UK tax-free status has no effect on the FBAR reporting obligation — the account is reportable based on its nature as a foreign financial account, not based on its tax treatment. Additionally, the FBAR balance for each ISA is the highest value during the calendar year — not the year-end balance — requiring confirmation of the maximum balance from the ISA provider's annual statement. Consequently, US expat tax services must include every ISA in the FBAR calculation and obtain the highest balance figure for each covered year. The FinCEN FBAR guidance is at https://www.fincen.gov/financial-crimes-enforcement-network/fbar.

Form 8938 for ISA and Share Portfolio

The ISA and any taxable UK investment account are specified foreign financial assets for Form 8938 purposes — reportable where the aggregate value of all specified foreign financial assets exceeds $200,000 at year-end or $300,000 at any point during the year for UK-resident single filers. Furthermore, the Form 8938 value for an ISA is the market value of the holdings at year-end — obtained from the annual ISA statement. Additionally, a UK share portfolio held directly — outside any ISA — is also a specified foreign financial asset reportable on Form 8938 where the combined value meets the threshold. Consequently, an American with a £95,000 stocks and shares ISA, a £60,000 direct share portfolio, and a £55,000 cash ISA has aggregate specified foreign financial assets of approximately £210,000 — approximately $266,000 — which exceeds the $200,000 year-end threshold as a single filer, triggering a Form 8938 obligation. The IRS Form 8938 guidance is at https://www.irs.gov/forms-pubs/about-form-8938.

Case Study: American With ISA and UK Share Portfolio

Our team provides US expat tax services for a US citizen who holds a cash ISA worth £28,000, a stocks and shares ISA containing three UK OEICs worth approximately £64,000, and a direct holding in four FTSE 100 companies generating approximately £3,200 of dividends per year. Furthermore, he also holds the shares through a UK investment platform account worth approximately £42,000.

Each year, the filing package includes the following. Schedule B reports cash ISA interest of approximately £840 (no foreign tax credit available), stocks and shares ISA dividends from any fund distributions (no UK tax — no credit), and FTSE 100 dividends from direct holdings of £3,200 with Form 1116 passive basket for UK dividend tax paid at 33.75%. Furthermore, Form 8621 is prepared for each of the three OEICs — one mark-to-market calculation per fund, with the annual NAV movement included as ordinary income or loss. Additionally, the FBAR lists the cash ISA, stocks and shares ISA, and the investment platform account at their highest annual balances. Form 8938 is assessed annually — the combined value of approximately £134,000 ($170,000) falls below the $200,000 year-end threshold in most years, so Form 8938 is not required unless the portfolio grows further. Consequently, the annual US expat tax services package is coordinated and complete — with no income stream omitted and no PFIC election overlooked.

Common Mistakes With UK Investment Income

Treating ISA Income as Tax-Free for US Purposes

The single most widespread error for Americans with ISAs is treating the ISA as US tax-free — not reporting any income arising within the account. Furthermore, the UK tax exemption provides zero US protection and the IRS taxes all ISA income in the year it arises. The correct approach requires US expat tax services to report all ISA interest, dividends, and capital gains on the appropriate US return schedules each year — obtaining the detailed income and transaction history from the ISA provider annually. IRS guidance is at https://www.irs.gov/individuals/international-taxpayers/us-citizens-and-resident-aliens-abroad.

Not Making PFIC Elections for UK Funds

Holding UK OEICs or unit trusts without a Form 8621 election defaults to the excess distribution regime — which taxes all gains at the highest historic ordinary income rate with compounding interest charges. Furthermore, the mark-to-market election on Form 8621 avoids this treatment by recognizing annual appreciation as ordinary income. The correct approach requires identifying every UK fund holding in the first year and making the mark-to-market election on Form 8621 from that year forward. Retroactive elections are available through the streamlined procedures where prior years were not addressed. The IRS Form 8621 guidance is at https://www.irs.gov/forms-pubs/about-form-8621.

Not Reporting ISA Accounts on the FBAR

Many Americans include their UK current account in the FBAR but omit the ISA — not recognizing it as a foreign financial account. Furthermore, each ISA type is a separate foreign financial account that must be individually listed on the FBAR with its highest annual balance. The correct approach requires confirming the type and number of all UK ISAs held and including every one in the FBAR balance calculation. The FBAR guidance is at https://www.fincen.gov/financial-crimes-enforcement-network/fbar.

How US-UK Tax Can Help

At US-UK Tax, our team of Enrolled Agents, Chartered Tax Advisers, and Certified Public Accountants provides specialist US expat tax services for Americans with UK investment accounts. Furthermore, we report all ISA income on Schedule B and Schedule D, make mark-to-market PFIC elections for all UK fund holdings on Form 8621, calculate the foreign tax credit for UK dividend tax on Form 1116 with excess credit carryforward tracking, file the FBAR for all ISA and investment accounts, and assess the Form 8938 obligation annually. Additionally, we correct prior-year omissions — including retroactive PFIC elections — through the streamlined procedures.

Contact our team today. Email hello@us-uktax.com, call 0333-8807974, or visit https://www.us-uktax.com/contact/.

Conclusion

The UK ISA provides zero US tax protection — all income and gains within an ISA are fully US-taxable in the year they arise. Furthermore, US expat tax services that address Schedule B for ISA interest and dividends, Schedule D for ISA disposals, Form 8621 mark-to-market elections for every UK fund, Form 1116 for UK dividend tax on direct shareholdings, and the FBAR for all ISA accounts ensure complete and accurate reporting of UK investment income. Moreover, the PFIC mark-to-market election must be made from the first year of fund ownership — retroactive elections require the streamlined procedures. Contact US-UK Tax at hello@us-uktax.com or call 0333-8807974 today.

Contact Us

US-UK Tax | hello@us-uktax.com | 0333-8807974

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FAQs

Q: Is UK ISA income tax-free for US citizens?

A: No. The IRS does not recognise the UK ISA's tax-free status. All interest, dividends, and capital gains arising within a UK ISA are fully US-taxable in the year they arise. The ISA is also FBAR-reportable as a foreign financial account. No foreign tax credit is available since no UK tax is paid within the ISA.

Q: Are UK dividends from listed shares qualified dividends for US tax?

A: Generally, yes. Dividends from UK companies listed on a recognized stock exchange qualify for the US preferential rate of 0%, 15%, or 20% rather than the ordinary income rate. UK dividend tax paid above the £500 allowance is creditable on Form 1116, passive income basket, against the US qualified dividend rate.

Q: What is a PFIC, and do UK funds qualify?

A: A PFIC is a passive foreign investment company — any non-US corporation earning primarily passive income. Virtually all UK OEICs, unit trusts, and investment trusts are PFICs. UK funds held in an ISA are also PFICs. Each PFIC requires an annual Form 8621 election — the mark-to-market election is the standard choice.

Q: Must I include my ISA on the FBAR?

A: Yes. Each ISA — cash, stocks and shares, and innovative finance — is a separate foreign financial account reportable on the FBAR at its highest balance during the year. This applies where the aggregate balance of all foreign accounts exceeds $10,000 at any point during the calendar year.

Q: What is the mark-to-market PFIC election?

A: An annual election on Form 8621 that taxes the year-on-year increase in a PFIC's net asset value as ordinary income — avoiding the punitive excess distribution regime. It must be made in the first year the fund is held. Retroactive elections for prior years require IRS approval or the streamlined filing procedures.

Q: Does the foreign tax credit cover UK dividend tax in the ISA?

A: No. No UK dividend tax is paid on ISA income — the ISA is UK tax-free. Where there is no UK tax to credit, the foreign tax credit is zero. The full US income tax on ISA income is therefore paid without any offset, making ISA income one of the few UK income sources that produce a net US tax liability.