My UK bonus was paid in March. Which US tax year does it belong in?

It belongs in the US calendar year in which you actually or constructively received it, so a bonus paid in March goes on that year's Form 1040. The UK will report it in the tax year ending on the following 5 April, which means your P60 will not match your US year. That is a documentation reconciliation, not a change to the US inclusion year. You rebuild the US year from monthly payslips instead.

Why do I have excess foreign tax credits in the year after a big bonus?

Because the UK tax on the bonus was paid across more than one US year while the income sat in one. On the paid basis, PAYE deducted at the bonus payroll credits the bonus year, but any Self Assessment balancing payment falls on the following 31 January, in the next US year. That later year has less general category foreign income, so the section 904 limitation is smaller and the surplus becomes an excess credit.

Should I elect the accrued basis on Form 1116 if my income is bonus heavy?

Often it aligns the UK tax with the year the income arose far better than the paid basis does. But the IRS states the choice binds all later years and all qualifying foreign taxes, and Publication 514 confirms it must be made by checking the Accrued box on a timely filed original return, never on an amended one. It also switches the translation of foreign taxes to an average rate, so model several years before electing.

Can I use the foreign earned income exclusion on a bonus paid after I left the UK?

Only within limits. The IRS treats income as earned in the year you did the work, so a bonus is tested against the exclusion capacity of the performance year, which base salary has often already consumed. There is also a hard stop: you cannot exclude income received after the end of the year following the year in which you did the work. A long deferral therefore leaves the foreign tax credit as the only relief available.

Is my National Insurance on the bonus creditable against US tax?

No. National Insurance is a social security contribution governed by the US-UK totalization agreement, not an income tax, so it does not belong in the foreign taxes column of Form 1116. Only UK income tax on the bonus supports a credit. On a large bonus the National Insurance line is substantial enough that including it materially overstates the claim, which is a common and expensive preparation error.

What happens to my US return if the bonus is later clawed back?

The two systems give relief differently and in the year of repayment, not the original year. HMRC treats a clawback as capable of producing negative taxable earnings under section 11(3) ITEPA 2003, but confirms no relief or repayment of National Insurance is possible on the original payment. The United States uses the claim of right mechanism in Publication 525. Foreign tax credits generated in the original year do not automatically reverse and can be left stranded.

UK Bonus Timing and US Tax Return Preparation

US tax return preparation bonus timing is the discipline of matching a UK bonus, and the UK tax paid on that bonus, to the correct US calendar year. The short answer is that the bonus itself belongs in the US year you actually or constructively receive it, while the UK tax on that same bonus is credited in the US year the tax is treated as paid, unless you have elected the accrued basis on Form 1116. Those two years are frequently not the same year. When they diverge, the foreign tax credit limitation does exactly what it is designed to do and refuses to let the credit shelter income it was never matched to.

For an investment banker, portfolio manager or senior business owner in London, this is not a rounding error. The bonus is usually the largest single line on the Form 1040, it is often several times base salary, and it arrives in a narrow window in the first quarter of the calendar year. That window sits almost exactly on the seam between the two tax calendars. In the returns we prepare, the most expensive single error in a high earner's cross-border file is not a missed form. It is a bonus that was reported in the right US year while the UK tax that should have offset it was credited in a different one.

This article is about the timing spine only. It is not a general explainer on whether a UK bonus is taxable in the United States. It assumes you already know it is, and that you are a US citizen or green card holder resident in the United Kingdom filing a Form 1040 and a UK Self Assessment return. What follows is the mechanics of which year each number falls into, why the answers differ on each side of the Atlantic, and what a preparer actually does about it.

Why do the two calendars break a UK bonus in half?

The United States taxes individuals on a calendar year running 1 January to 31 December. The United Kingdom runs its personal tax year from 6 April to 5 April. GOV.UK confirms the UK year end and the reporting furniture that follows it at https://www.gov.uk/payroll-annual-reporting, which sets out that employers must give employees a P60 by 31 May and report expenses and benefits by 6 July. Those dates matter later, because they govern when the documents that drive your US return actually exist.

Now overlay a typical bonus round. Suppose a bonus is paid on 20 March. It falls in the US calendar year that began on 1 January, and it falls in the UK tax year that ends on the following 5 April. Now move the same payment three weeks later to 10 April. It is still in the same US calendar year, but it has moved into the next UK tax year. Two payments a few weeks apart therefore appear on the same Form 1040 while appearing on two different UK returns, with two different UK payment profiles behind them. This is the entire mismatch in one sentence, and it is why bonus timing deserves its own section of a cross-border return file.

It helps to stop thinking about two calendars and start thinking about three separate clocks, because they can all point at different years:

Clock one, UK receipt. The date the bonus is treated as received for UK income tax and PAYE purposes, which is not always the date it hits your account.
Clock two, US inclusion. The date the bonus is includible in US gross income for a cash basis individual, driven by actual or constructive receipt.
Clock three, UK tax payment. The date the UK tax on the bonus is actually paid, which for a PAYE bonus is largely the payroll date but for anything settled through Self Assessment can be a January or July in a later US year.

Most published guidance on this subject stops after clock one and clock two. Clock three is where the foreign tax credit is won or lost, and it is the part almost nobody writes about.

When is a UK bonus treated as received for UK tax?

The UK does not simply ask when the money moved. HMRC sets out the receipts basis in its Employment Income Manual at https://www.gov.uk/hmrc-internal-manuals/employment-income-manual/eim42260, which explains that money earnings are treated as received, and paid for PAYE purposes, on the earliest of a list of occasions. For an ordinary employee the two that bite are the time a payment of earnings or a payment on account of earnings is actually made, and the time the person becomes entitled to payment of earnings or a payment on account of earnings. Directors face additional rules based on when earnings are credited in the company records and when the amount is determined. The governing provision is section 18 ITEPA 2003, and the operating principle is that where more than one time could apply, you take the earliest.

Entitlement is the concept that catches people out. HMRC deals with it directly at https://www.gov.uk/hmrc-internal-manuals/employment-income-manual/eim42290, which states that earnings are treated as received when a person becomes entitled to payment of or on account of earnings, and works through the difference between satisfying a condition and becoming entitled. A bonus can be determined in one period, become an entitlement in a second, and be paid in a third. The UK will tax it by reference to the earliest applicable trigger, which for a conventional discretionary bonus is usually the payroll date but for a contractual bonus with a fixed payment date can be earlier or later than instinct suggests.

The practical consequence for the US return is that the P60 and payslips reflect a UK statutory concept of receipt, not a bank credit date. When we reconcile a bonus into a US year we look at the payslip period and the entitlement terms in the award letter, not simply the date the money appeared.

When does a UK bonus go into US income?

An individual filing Form 1040 is almost always a cash method taxpayer, so a bonus is included in gross income when it is actually or constructively received. The IRS explains constructive receipt in Publication 538 at https://www.irs.gov/publications/p538, which describes income as constructively received when an amount is credited to your account or made available to you without restriction, and confirms that income is not constructively received if your control of its receipt is subject to substantial restrictions or limitations.

That last clause is the one to hold on to. A deferred bonus that you cannot access, that remains subject to forfeiture, and that will be paid only if conditions are met, is generally not constructively received simply because it has been announced. A bonus that has been declared, quantified and made available to you, but which you asked payroll to hold, is a different animal. The US analysis runs on availability and restriction. The UK analysis runs on the earliest of payment, entitlement and, for directors, determination. They are different tests applied to the same facts, and they will not always land in the same year.

The clean statement is this. A UK bonus is US taxable income in the US calendar year in which it is actually or constructively received, translated into dollars, regardless of which UK tax year the P60 puts it in. The UK tax year is a documentation problem for the preparer, not a rule of US inclusion.

How do deferred and clawback bonuses change the year?

Deferral is standard at senior levels in London, and it moves both clocks at once but not always by the same amount. Where a deferred cash award is genuinely subject to forfeiture and continued service, the US inclusion generally waits for vesting and payment, because the substantial restrictions defeat constructive receipt. On the UK side, deferral usually pushes entitlement and payment out to the same vesting date, so the two systems often re-converge. The risk case is the award that vests near a 5 April boundary or near a 31 December boundary, because a few days of slippage in a vesting calendar can move an entire year of foreign tax credit capacity.

Clawback is where the two systems stop agreeing altogether, and it is the second angle competitors rarely cover. On the UK side, HMRC addresses clawed back bonuses at https://www.gov.uk/hmrc-internal-manuals/employment-income-manual/eim00805, which explains that a repayment can give rise to negative taxable earnings under section 11(3) ITEPA 2003, with possible relief by set off against general income under section 128 ITA 2007, and which states plainly that a clawback does not change the position for National Insurance contributions or the PAYE deductions on the original payment, so no relief or repayment of NICs is possible. The relief, where available, is given in the year the repayment is made, not the year the bonus was taxed.

The United States handles the same event through the claim of right mechanism described by the IRS in Publication 525 at https://www.irs.gov/publications/p525, under which a taxpayer who repays an amount previously included in income may take relief in the year of repayment, either as a deduction or as a credit computed by reference to the earlier year, subject to statutory conditions. The net effect on a cross-border file is asymmetry in three directions at once. The UK gives income tax relief but not NIC relief. The United States gives relief in the year of repayment on its own terms. And the foreign tax credit generated in the original bonus year does not politely reverse itself, which can leave a stranded credit balance in a year whose income has since been partly unwound.

Why is US tax return preparation bonus timing a foreign tax credit problem?

The foreign tax credit is not a rebate. It is a limited credit, computed separately for each category of income, and capped so that it can never exceed the US tax attributable to the foreign income in that category. A UK employment bonus sits in the general category basket alongside salary. IRS Publication 514 at https://www.irs.gov/publications/p514 sets out the separate categories, including general category income and passive category income, and explains how unused foreign taxes are handled. Publication 514 confirms that unused foreign taxes are first carried back one year and, if they cannot be used there, carried forward to the ten years following the year in which they arose. Form 1116 is the vehicle, and the IRS notes at https://www.irs.gov/forms-pubs/about-form-1116 that Schedule B to that form reconciles the prior year foreign tax carryover with the current year carryover.

Now put a bonus into that machine. The limitation is a fraction. Foreign source income in the general category over total taxable income, applied to the US tax. When a bonus lands, the numerator jumps in that year, so the year of the bonus generally has ample capacity. The problem is the neighbouring years. If the UK tax attributable to the bonus is treated as paid in a different US year from the bonus itself, you get a year with a large amount of foreign income and thin credit against it, and an adjacent year with a pile of credit and not enough foreign income to absorb it. That second year produces excess credits. Excess credits are not lost, but they are dead money. They carry back one year and forward ten, they are tracked on Schedule B, and in a career where bonus size and residency both change, a meaningful share of them expire unused.

This is why bonus timing is a foreign tax credit question rather than an income recognition question. Getting the bonus into the right US year is the easy part. Getting the UK tax into the same US year, or accepting that it will not be and planning the carryover deliberately, is the work.

Should you claim the credit on the paid or the accrued basis?

This is the single most consequential election in a bonus-heavy cross-border file. The IRS explains at https://www.irs.gov/individuals/international-taxpayers/foreign-tax-credit-choosing-to-take-credit-or-deduction that a cash method taxpayer may claim the credit either in the year the tax is paid or in the year it accrues, but that once the choice to accrue is made it must be followed in all later years and applies to all foreign taxes that qualify for the credit. Publication 514 adds the procedural detail that the election is made by checking the Accrued box in Part II of Form 1116 on a timely filed original return, and that it cannot be made on an amended return.

The trade offs we weigh when a client's income is bonus dominated are these:

The accrued basis lines the UK tax up with the UK tax year in which the income arose, which usually matches the economic reality of a bonus far better than the date a balancing payment cleared.
The accrued basis is effectively permanent. It binds all later years and all foreign taxes, not just the bonus, so it must be tested against the whole projected profile rather than one good year.
The election cannot be made on an amended return, so it has to be decided before the original Form 1040 is filed, not discovered afterwards during a review.
The accrued basis changes the currency answer as well as the timing answer. Publication 514 explains that foreign taxes are generally translated at the rate in effect on the date paid, but that where the credit is claimed on an accrual basis you generally use the average exchange rate for the tax year to which the taxes relate.
The paid basis is simpler to evidence, because a payment date and an amount are objective facts, and it is often the right answer for a taxpayer whose UK liability is settled almost entirely through PAYE at the point the bonus is paid.

That last currency point is underrated. Electing accrual is a sterling exposure decision as much as a timing decision, because it hands the translation of a very large UK tax figure to an annual average rather than to a spot rate you can identify on a payslip. In a volatile sterling year that alone can move the credit by a material amount.

The third clock: when is the UK tax on your bonus actually paid?

Here is the angle almost no competing page covers. On the paid basis, the credit follows the date the UK tax is paid, and a bonus does not always generate a single payment date. The PAYE deducted at the bonus payroll is paid in that month. But a high earner in London routinely has a UK liability that is not fully settled by PAYE, because of the restriction of the personal allowance at higher incomes, benefits reported after the year end, or investment income. That residue goes through Self Assessment. GOV.UK sets the rhythm at https://www.gov.uk/understand-self-assessment-bill/payments-on-account, which states that payments on account are due by midnight on 31 January and 31 July, that the balancing payment is due by midnight on 31 January the following year, and that each payment on account is usually half the tax owed the previous year.

Follow that through for a bonus paid in March. The PAYE on it is paid in that same US calendar year. The balancing payment arising from the same UK tax year is not due until the following 31 January, which is the next US calendar year, and the payments on account driven by that inflated liability fall on the 31 January and 31 July after that. On a paid basis the UK tax attributable to one bonus can therefore be spread across two or even three US tax years. That is why a bonus year can look fully credited and the following year can look starved, and it is why we model the UK payment schedule as an input to the US return rather than as a UK housekeeping matter.

How does a bonus affect the foreign earned income exclusion?

Most high earners in London are credit taxpayers rather than exclusion taxpayers, because UK effective rates on employment income are generally high enough that credits do more work than the exclusion. But the exclusion still appears in these files, particularly in an arrival or departure year, and a bonus interacts with it through a rule that has nothing to do with when you received the money. The IRS states at https://www.irs.gov/individuals/international-taxpayers/figuring-the-foreign-earned-income-exclusion that you are considered to have earned income in the year in which you do the work for which you receive the income, even if you work in one year but are not paid until the following year, and that regardless of when you receive income you must apply it to the year in which you earned it to determine your excludable amount for that year.

That is the attribution rule for a bonus. A bonus for the performance year is tested against the exclusion capacity of the performance year, not the payment year. Two consequences follow, and both are common in practice.

The exclusion limit for the earlier year may already be fully consumed by that year's salary, in which case a bonus attributable to that year is excluded to the extent of nothing at all, however early in the payment year it arrives.
There is a hard stop on late payment. The IRS states that you cannot exclude income you receive after the end of the year following the year in which you did the work to earn it. A long deferral therefore takes a bonus permanently outside the exclusion, whatever the vesting terms say, leaving the foreign tax credit as the only relief.

The same page also confirms that where you qualify for only part of a year, the maximum exclusion is prorated by multiplying the maximum exclusion amount for the year by your qualifying days and dividing by 365, or 366 in a leap year. In a move year that proration usually leaves very little room for a bonus. We do not quote a current exclusion amount here because it is indexed and changes; the figure for the relevant year should always be taken from the IRS instructions for the year being filed.

What if the bonus straddles a move into or out of the UK?

Sourcing is decided by where the services were performed, not by where the money was paid from. The IRS puts this plainly at https://www.irs.gov/individuals/international-taxpayers/source-of-income-personal-service-income, stating that the place where the personal services are performed generally determines the source of the personal service income, regardless of where the contract was made, the place of payment, or the residence of the payer, and that where services span locations the US source amount is found by multiplying the total pay by the fraction of days on which services were performed in the United States over the total days of service for which the compensation is paid.

For a bonus this is a days exercise over the performance period, not over the payment date. A banker who moved from New York to London in the middle of a performance year and receives the bonus for that year after arriving has a bonus that is partly US source and partly UK source, and only the UK source portion supports a foreign tax credit in the general category. Reverse the move and the same logic strands a portion of the bonus as US source income against which UK tax was nevertheless withheld, which is precisely the pattern that creates excess credits and, sometimes, a need to consider the relief and re-sourcing provisions of the income tax convention. The US-UK treaty documents, including the convention, protocol, technical explanation and exchange of notes, are published by the IRS at https://www.irs.gov/businesses/international-businesses/united-kingdom-uk-tax-treaty-documents and should be read before any position that depends on re-sourcing is taken.

Do National Insurance and US social security follow the bonus?

A UK bonus attracts employee National Insurance contributions through payroll in the same way as other earnings, and the clawback guidance above confirms that a later repayment does not undo those contributions. On the US side, the question is whether the same earnings also attract US Social Security and Medicare tax, and the answer is governed by the totalization agreement rather than by the income tax treaty. The IRS explains the purpose of these agreements at https://www.irs.gov/individuals/international-taxpayers/totalization-agreements, describing them as agreements entered into for the purpose of avoiding double taxation of income with respect to social security taxes, and confirming that they must be considered when determining whether an individual is subject to US Social Security and Medicare tax or to the social security taxes of a foreign country. The United States and the United Kingdom have such an agreement, described by the Social Security Administration at https://www.ssa.gov/international/Agreement_Pamphlets/uk.html.

Two practical points follow for a bonus. First, the coverage question is answered once for the employment as a whole and then applies to the bonus as part of that employment, so a bonus does not create a separate coverage analysis. Second, and importantly for the credit arithmetic, social security contributions covered by a totalization agreement are not income taxes. They are not the raw material of a Form 1116 claim, and a preparer who sweeps the National Insurance line off a payslip into the foreign taxes column has overstated the credit. On a large bonus the National Insurance figure is big enough that this error is expensive and, on review, obvious.

What does a large bonus do to US withholding and estimated tax?

A US citizen employed by a UK entity and paid through UK payroll generally has no US federal withholding at all. Every dollar of US tax that survives the credit has to be paid by the taxpayer, in cash, on the estimated tax calendar. The IRS states at https://www.irs.gov/businesses/small-businesses-self-employed/estimated-taxes that individuals generally have to make estimated tax payments if they expect to owe tax of 1,000 dollars or more when their return is filed, and that a penalty is generally avoided if the taxpayer owed less than 1,000 dollars after withholding and credits, or paid at least 90 percent of the tax for the current year or 100 percent of the tax shown on the prior year return, whichever is smaller.

Read that against a bonus profile. The prior year safe harbour is computed on a return that may have contained a very different bonus. A year in which the bonus doubles, or in which the credit is stranded by the timing mismatch described above, can produce a US balance due that no prior year safe harbour anticipated. The failure mode we see most often is a taxpayer who has correctly concluded that credits will cover the tax, has therefore paid nothing during the year, and then finds that a timing split left an uncovered balance. The fix is unglamorous. Project the credit position in the bonus year before the bonus year ends, and fund the estimated tax accordingly rather than after the fact.

A worked illustration of a stranded bonus credit

The following is an illustration only. The figures are invented to show the mechanism, not drawn from a real client file, and the exchange rate is an assumption stated for the arithmetic rather than a rate for any particular date. Assume an exchange rate of 1.30 dollars to the pound throughout, applied consistently.

A US citizen banker resident in London has base salary of 250,000 pounds and receives a bonus of 750,000 pounds paid on 20 March of Year 1. For US purposes the bonus is received in Year 1, so Year 1 gross income includes roughly 975,000 dollars of bonus alongside the salary. For UK purposes the bonus falls in the UK tax year ending on the 5 April that follows, so it appears on the P60 for that UK year and is reported on the UK return filed in the following January.

PAYE is operated on the bonus in March, so a large slice of the UK tax is paid in Year 1 and is available as a Year 1 credit on the paid basis. But the personal allowance restriction, benefits reported on the P11D after the year end and investment income mean an additional UK liability is settled through Self Assessment. That balancing payment falls on the 31 January inside Year 2, and the payments on account it drives fall on 31 January and 31 July of Year 2 as well. On the paid basis, that additional UK tax is a Year 2 credit.

Year 2, however, is a lower bonus year. The general category foreign income in Year 2 is smaller, so the section 904 limitation in Year 2 is smaller, and a chunk of that UK tax cannot be used. It becomes an excess credit. Under the carryover rules in Publication 514 it goes back one year first, into Year 1, where it may find capacity because Year 1 was the big bonus year, and anything still unused carries forward for ten years. If Year 1 has already been fully absorbed, the credit sits in the carryforward pool waiting for a future year with general category capacity. Meanwhile Year 1 itself may have shown a balance due, because the credit that economically belonged to the Year 1 bonus was not paid until Year 2. That is the mismatch in cash terms. The credit exists, it is just not in the year the income is.

Had the accrual election been in place on a timely filed original Form 1116, the UK tax attributable to that UK tax year would have been matched to the year it accrued rather than the year it was paid, which in this pattern usually improves the alignment considerably. That is the decision the illustration is designed to expose.

Which UK documents drive the US return, and how do you convert sterling?

A US return cannot be built from a P60 alone, because the P60 covers a UK year ending 5 April and the US return needs a calendar year. The reconstruction is done from payslips. The document set we ask for on a bonus-heavy file is:

Every monthly payslip for the calendar year, including the bonus month, showing gross pay, income tax deducted and National Insurance deducted separately.
The P60 for each UK tax year that overlaps the US calendar year, which means two P60s for every US year, available only after 31 May for the year just ended.
The P11D for the relevant UK years, available after 6 July, because reported benefits change the UK liability and therefore the credit.
Any P45 for a leaver or joiner year, and the bonus award letter or deferral schedule setting out determination, entitlement and vesting dates.
The UK Self Assessment tax calculation and the record of payments on account and balancing payments actually made, with their dates, which is what a paid basis credit claim stands on.
Bank statements or payroll remittance records evidencing the date the bonus was made available, which is the constructive receipt evidence if the point is ever tested.

On currency, the IRS position is set out at https://www.irs.gov/individuals/international-taxpayers/yearly-average-currency-exchange-rates, which states that in general you use the exchange rate prevailing, that is the spot rate, when you receive, pay or accrue the item, and that the IRS generally accepts any posted exchange rate that is used consistently. For a bonus that means the sensible default is the rate on the date of receipt rather than an annual average, because a single large payment on a known date is exactly the case the spot rule was written for. Where the credit is claimed on an accrual basis, Publication 514 directs you to the average rate for the year to which the taxes relate instead. Consistency is the discipline the IRS actually cares about, so whichever convention is chosen should be documented in the file and repeated year on year.

How do we plan the return around a bonus?

Planning here means planning the preparation, not restructuring the pay. The order of work matters, because several of the decisions are irreversible once the original return is filed.

Fix the US year first. Establish the date of actual or constructive receipt from the payslip and the award terms, and translate at the rate for that date.
Map the UK tax year the bonus falls into, and list every UK payment that will settle the liability for that UK year, with dates. This is the paid basis picture.
Model both bases side by side for the bonus year and at least the two following years, because the accrual election binds all of them and cannot be made on an amended return.
Separate National Insurance from income tax on every payslip line before anything reaches Form 1116.
Check the general category limitation in the year after the bonus, which is where excess credits usually appear, and reconcile the carryover on Schedule B.
Test any part of the bonus attributable to services performed outside the United Kingdom for sourcing, using days over the performance period.
Set the estimated tax funding for the bonus year on the projected credit position, not on the assumption that credits will absorb everything.
Keep the UK filing and the US filing on one timetable, because the UK figures that finalise the credit only exist after the P60 and P11D deadlines have passed.

None of this is exotic. It is ordinary, careful preparation applied to the one number on the return that is large enough to punish carelessness. If you want the mechanics of the carryover itself, we have written that up separately at https://us-uktax.com/insights/news-and-updates/foreign-tax-credit-carryback-and-carryover-form-1116. Our US filing work for UK-resident clients is set out at https://us-uktax.com/us-tax-services, the UK side at https://us-uktax.com/uk-tax-services, and the combined position for people with income arising on both sides at https://us-uktax.com/cross-border-tax-planning.

The single sentence we would want a London high earner to take away is this. Your bonus and the tax on your bonus are two separate timing questions, and a return that gets the first one right and the second one wrong will still cost you money. Ask which US year the UK tax lands in before the return is filed, not after.