Missed US Tax Returns for Staff of International Organisations

Missed US tax returns are one of the most common problems we see among senior US citizens and green-card holders in the UK who work for an international organisation, because the salary arrives with no tax deducted and everyone around them describes it as tax free. The short answer is that the exemption is real in the UK and does not exist in the United States for a US citizen. The pay is reportable as wages on Form 1040 every year, the organisation's pension plan and your UK accounts carry their own reporting, and most people in this position can still put matters right without penalties through the Streamlined Foreign Offshore Procedures, provided the failure was non-willful and they meet the non-residency test.

Why do staff of international organisations end up with missed US tax returns?

The pattern is consistent. A US citizen is recruited into a director-grade post, payslips show no income tax, and the induction explains that the organisation's headquarters agreement exempts official emoluments. All of that is accurate for the host country. What nobody says clearly is that the exemption is granted by the UK, as host state, and that the United States taxes its citizens and lawful permanent residents on worldwide income regardless of where they live or who pays them.

Three features of this employment make the gap easy to fall into. There is no Form W-2, so nothing arrives each January to prompt a filing. There is no US withholding, so no refund is at stake. And there is often no UK tax return either, so no accountant is looking at the individual's affairs at all.

Does the US exempt the salary of a US citizen working for an international organisation?

No. The US exemption for compensation paid by a foreign government or international organisation sits in section 893 of the Internal Revenue Code, and its first condition is about citizenship. The statute, which can be read at https://www.law.cornell.edu/uscode/text/26/893, excludes the wages, fees or salary of an employee of a foreign government or international organisation received for official services only where the employee is not a citizen of the United States (the statute carves out one narrow case for citizens of the Republic of the Philippines). A US citizen fails that condition on the first line, wherever the work is done.

The IRS says the same thing in practical terms on its page for employees of a foreign government or international organisation at https://www.irs.gov/individuals/international-taxpayers/employees-of-a-foreign-government-or-international-organization-how-to-report-compensation. A US citizen working outside the United States for an international organisation reports the foreign-source compensation as wages on Form 1040. That page defines an international organisation as a public international organisation entitled to privileges and immunities under the International Organizations Immunities Act. Dual citizens generally follow the same rules as US citizens, which matters for British-American staff.

How is the salary reported when there is no Form W-2 and no withholding?

The absence of a Form W-2 changes the paperwork, not the obligation. The compensation is entered as wages on Form 1040, supported by the organisation's own annual statement of earnings rather than a US information return. Because the pay is not subject to US withholding, the IRS page states that you generally must make estimated tax payments on Form 1040-ES if you expect to owe tax, and it lists the instalment dates as April 15, June 15, September 15 and January 15, with a penalty for late or missed instalments. The catch-up exercise therefore has two parts: clearing the past years, then moving to quarterly payments.

The same IRS page is explicit that this employment does not make you self-employed for other federal tax purposes. You cannot claim business expenses on Schedule C against the salary, you cannot set up a self-employed retirement plan on the strength of it, and unreimbursed employee business expenses have not been deductible since 2018.

Is self-employment tax due on international organisation pay?

It depends on where the services are performed, and this is the point most often stated wrongly online. According to the IRS page cited above, a US citizen who works in the United States for a foreign government or international organisation reports the pay as wages and is also subject to self-employment tax under the Self-Employment Contributions Act, computed on Schedule SE. A US citizen who works outside the United States for such an employer reports the foreign-source compensation as wages on Form 1040, but that compensation is not subject to self-employment tax.

For London-based staff the practical consequence is that the ordinary UK-performed salary does not attract self-employment tax. The complication is duty travel. Senior staff of development banks and treaty bodies often spend working days in the United States at annual meetings, board sessions or missions. Because the IRS draws its line by where the services are performed, we ask every client for a travel calendar and identify US working days before deciding how the return should treat them.

Can the foreign earned income exclusion or a foreign tax credit reduce the bill?

These are the two standard tools for Americans abroad, and for international organisation staff only one of them usually does any work. The foreign earned income exclusion is described in IRS Publication 54, revised December 2025, at https://www.irs.gov/publications/p54. It applies to income from personal services performed in a foreign country, it requires you to meet either the bona fide residence test or the physical presence test, and it is elected by attaching Form 2555 to your Form 1040. The publication no longer prints the annual inflation-adjusted limit, so we take the figure for each year from the IRS inflation adjustment tables rather than from memory, and we do not quote one here.

Publication 54 excludes pay from the United States government or its agencies from the definition of foreign earned income. Salary from an intergovernmental body is not US government pay, and the publication includes an example of a US citizen serving as an official of an international body abroad whose exemption from host-country tax on that salary does not prevent bona fide residence there. On that footing, in the returns we prepare, the salary is generally treated as foreign earned income for a UK-resident member of staff who meets one of the two tests. Two cautions apply. There are timing conditions for making the exclusion election on a late return, set out in Publication 54 and the Form 2555 instructions, which have to be checked for each year before the exclusion is relied on. And at senior grades the salary is usually well above the annual limit.

That excess is where the real cost sits. An ordinary UK employee earning above the exclusion limit covers the remainder with a credit for UK income tax paid through PAYE. A foreign tax credit depends on foreign income tax actually paid or accrued on the income. Where the UK exempts the official salary, no UK income tax has been paid on it, so there is nothing to credit. The result is that US tax is payable in full on the salary above the exclusion, which is the single most important number for a senior member of staff to understand before the first return is filed.

What about staff assessments, tax allowances and reimbursements for US nationals?

Many organisations operate an internal levy on salaries, often called a staff assessment, which is retained by the organisation and not paid to any national treasury. Some also operate a tax allowance or reimbursement arrangement for nationals whose home country taxes the salary. The terms differ between organisations, and the IRS pages we reviewed do not set out a single rule for them, so we describe the approach rather than assert an outcome.

In preparation work we treat two questions as open until the organisation's own documents answer them: whether the gross or the net-of-levy figure is the compensation, and whether any tax allowance or reimbursement was paid, in which year, and how it is described. A payment the employer makes because of the employment has to be identified and reported correctly, not left off because it was labelled as a refund of tax. We do not treat an internal levy as a foreign income tax for credit purposes without specific authority for that organisation. Staff who never filed have usually never claimed any reimbursement on offer, so the organisation's claim rules and time limits are worth reading before the returns are finalised.

Is the organisation's pension or provident plan reportable on the FBAR and Form 8938?

It has to be considered. From the US side the organisation's retirement arrangement is a foreign plan, and it raises three questions: whether it is a financial account for the FBAR, whether it is a specified foreign financial asset for Form 8938, and how contributions and growth are treated for income tax. The answers depend on whether it is a defined benefit staff pension or an individual-account provident fund, and on how the assets are held. The IRS comparison table at https://www.irs.gov/businesses/comparison-of-form-8938-and-fbar-requirements does not give one line for employer pension plans; it confirms that financial accounts at foreign financial institutions are reportable on both forms and that benefits under a foreign government social security type programme are reportable on neither.

The thresholds on that IRS page are the ones to work from:

• FBAR (FinCEN Form 114): required where the aggregate value of foreign financial accounts exceeds $10,000 at any time during the calendar year. Accounts are added together, so once the total passes $10,000 every account is listed.
• FBAR timing and filing: due April 15 with an automatic extension to October 15, filed electronically through FinCEN's BSA E-Filing System and not with the tax return.
• Form 8938, living abroad, unmarried or married filing separately: specified foreign financial assets above $200,000 on the last day of the year or above $300,000 at any time during the year.
• Form 8938, living abroad, married filing jointly: above $400,000 on the last day of the year or above $600,000 at any time during the year.
• Form 8938 filing: attached to the annual income tax return. The IRS page states a penalty of up to $10,000 for failure to disclose, with a further $10,000 for each 30 days of non-filing after IRS notice, up to a potential maximum of $60,000.

The failure mode we see most often is a first-time filer who reports salary carefully and then omits the provident fund, a joint account held with a non-US spouse, or an investment portfolio of UK funds that brings its own US reporting.

What do green-card holders working for an international organisation need to know?

Lawful permanent residents are US tax residents and are in substantially the same income tax position as citizens. The IRS reporting page states that a green-card holder's earnings from a foreign government or international organisation are reported as wages, that they are not subject to self-employment tax, and that the individual may not voluntarily pay self-employment tax on those earnings. Estimated tax payments apply on the same schedule if income tax is expected to be due.

One point needs care. Some permanent residents employed by international bodies have signed immigration paperwork dealing with the rights, privileges and exemptions attached to their position. We could not verify the detail of that waiver process on an official page for this article, so we simply ask clients to locate any such document and include it in the file.

What does the UK exemption cover, and what stays in Self Assessment?

On the UK side the exemption is specific and narrow. HMRC's International Manual explains at https://www.gov.uk/hmrc-internal-manuals/international-manual/intm860700 that the privileges and immunities of international organisations and their staff are usually given effect in UK law by an Order in Council made under the International Organisations Act 1968, and that each Order specifies the tax privileges due and the classes of staff entitled to them. The manual states that in most cases the exemption is limited to the official emoluments of the staff member. A small number of high officers receive treatment equivalent to diplomats, and the manual also flags that in some cases no exemption applies at all, so the wording of the Order for your own organisation is what counts.

Everything outside the official salary is ordinary UK taxable income for a UK resident. GOV.UK lists the untaxed income that can require a tax return at https://www.gov.uk/self-assessment-tax-returns/who-must-send-a-tax-return, including rent from property or land, savings interest, dividends including from investments, and foreign income, as well as having Capital Gains Tax to pay. The same page states that you must tell HMRC by 5 October if you need to complete a return for the previous tax year and have not sent one before. For the reader we are describing, the usual items are portfolio income and gains, rent from a UK property or a US home let after the move, interest on cash built up from an untaxed salary, and a spouse's own earnings, which have no connection with the organisation's privileges.

A US return and a UK return for the same household therefore need to be prepared from one consistent set of figures, in two currencies and two tax years.

How do the Streamlined Foreign Offshore Procedures work for international organisation staff?

The Streamlined Foreign Offshore Procedures are an IRS programme that lets non-willful taxpayers living outside the United States file a defined set of late returns and reports without penalties. The IRS sets out the terms at https://www.irs.gov/individuals/international-taxpayers/us-taxpayers-residing-outside-the-united-states. They are open to US citizens and lawful permanent residents whose failure to report income, pay tax or file FBARs was non-willful, which the IRS describes as conduct due to negligence, inadvertence or mistake, or conduct that results from a good faith misunderstanding of the requirements of the law.

The non-residency test for citizens and green-card holders is that, in at least one of the most recent three years for which the US tax return due date has passed, the individual did not have a US abode and was physically outside the United States for at least 330 full days. On a joint submission both spouses must meet it. The submission itself consists of:

• Delinquent or amended income tax returns for the most recent three years for which the due date has passed, with all required information returns such as Form 8938.
• FBARs for the most recent six years for which the FBAR due date has passed, filed electronically through FinCEN's BSA E-Filing System, selecting 'Other' as the reason for late filing and entering 'Streamlined Filing Compliance Procedures' as the explanation.
• Form 14653, the certification by a US person residing outside the United States, signed and setting out the specific facts behind the non-willful failure. A missing or deficient certification means the returns are processed normally without the programme's protection.
• Full payment of the tax shown on the returns together with statutory interest.
• The words 'Streamlined Foreign Offshore' written in red at the top of the first page of each return, with the package sent on paper to the IRS address in Austin, Texas given on the IRS page. Electronic submission of the returns is not accepted.

A taxpayer who meets the terms is not subject to failure-to-file penalties, failure-to-pay penalties, accuracy-related penalties, information return penalties or FBAR penalties. The protection is not unconditional: the IRS states that returns filed this way can still be examined, and the relief falls away if an examination finds fraud or a willful FBAR violation.

For international organisation staff, Form 14653 is where the case is made. A statement that says only that the salary was believed to be tax free is thin. The certification should record the recruitment and induction material, the absence of any US reporting by the employer, when the individual first learned of the obligation and what they did next. A long delay between learning and acting is the fact that most weakens a non-willful narrative.

Streamlined or simply filing late returns: which route fits?

Filing late returns through the normal channels is a legitimate alternative. It can suit a member of staff who owes little or no tax for every year and has no unreported accounts or information returns outstanding, although the ordinary penalty rules apply with no programme relief. Any missing FBARs are filed through the BSA E-Filing System with a reason for late filing.

The streamlined route suits the reader this article is aimed at: salary above the exclusion with no UK tax to credit, a provident fund and investment accounts never reported, and Form 8938 missing for several years. That profile has tax due and information return exposure, which is what the programme's penalty relief covers. The decision should be made once, on a full set of figures, before anything is filed.

How do you rebuild the income record from annual salary statements?

With no Form W-2, the income side of each return is reconstructed from the organisation's records and the individual's bank statements. The US return runs on the calendar year while a UK return runs from 6 April to 5 April, so the same documents are cut two ways. Our working file for each year normally contains:

• The annual statement of earnings or salary certificate issued by the organisation, plus monthly payslips to reconcile gross pay, internal levy, pension contributions and net pay.
• A breakdown of allowances: housing, education grants, dependency allowances, home leave travel and relocation payments, each identified separately.
• Pension or provident plan statements showing employee and employer contributions, growth and the year-end and highest balance.
• Year-end and highest balances for every bank, savings and investment account outside the United States, including joint accounts and accounts where there is signature authority only.
• A calendar of days in the United States, split between working days and personal days, for the non-residency test and the self-employment tax question.
• UK Self Assessment returns for the same period, where any were filed, with evidence of UK tax paid on investment or rental income.

Worked scenario: a director-grade American at a London-based organisation

The following is an illustration only, with invented figures and an assumed exchange rate of $1.30 to £1 used purely for the example. A US citizen has lived in London for eight years as a director at a treaty-based organisation. Her salary is £210,000 a year, about $273,000 at the assumed rate, paid with no UK income tax. She is married to a British national who is not a US person. She holds a provident fund balance of £480,000 (about $624,000), a share portfolio of £350,000 (about $455,000) and joint cash accounts of £90,000 (about $117,000). She spends around 20 days a year in the United States, of which six are working days at meetings. She has never filed a US return, and has filed UK returns only for her investment income.

Working through the rules above: her salary is reportable as wages on Form 1040, with no section 893 exemption because she is a citizen. She was outside the United States for about 345 days in each recent year and has no US abode, so she meets the 330-day test. Her UK-performed salary is not subject to self-employment tax, and the six US working days are examined separately. The foreign earned income exclusion may shelter part of the salary, subject to the late-election conditions; the balance is taxed in the United States with no UK tax to credit against it. Her foreign accounts far exceed $10,000 in aggregate, so FBARs are due for six years, and her cash and portfolio alone exceed the Form 8938 thresholds for a taxpayer abroad, so Form 8938 belongs with each of the three returns. The package is three returns, six FBARs, Form 14653 and payment of tax and interest, with no penalties if the terms are met.

What should you do next?

Three things, in order. Gather the organisation's annual statements and your account balances for the last six years. Do not file a single current-year return in isolation before the route has been chosen. Then have the whole position prepared at once: US returns, FBARs, Form 8938, the certification and, where other income exists, the UK Self Assessment side reconciled to the same figures.

We prepare streamlined submissions and ongoing US and UK returns for senior staff of development banks, maritime and other treaty-based bodies in London. The rules described here are those published at the time of writing in October 2026.

Related reading and tools

• US Tax Services & IRS Compliance
• UK Tax Services
• IRS Streamlined Filing
• UK Income Tax Calculator
• US Federal Income Tax Calculator

Every situation is different. Book a cross-border tax consultation to discuss how these rules apply to you.

Authoritative sources

IRS — Streamlined Filing Compliance Procedures

FinCEN — Report of Foreign Bank and Financial Accounts (FBAR)

HM Revenue & Customs

GOV.UK — Tax on foreign income

IRS — Foreign Earned Income Exclusion

IRS — Foreign Tax Credit

ICAEW

Chartered Institute of Taxation (CIOT)

AICPA

MoneyHelper (UK)