Your payslip says you earned less. America is not convinced

Figures relate to tax year 2025-26 (UK) · 2025 (US)

Salary sacrifice looks like free money. Give up £400 a month of gross pay and the company puts it into your pension, leases you an electric car, or buys you a bicycle. Your take-home barely moves, because the money never passed through tax or National Insurance.

For a British colleague that is simply a good deal. For you it raises a question HR cannot answer. Does America accept that you earned less? Or does it look through the arrangement and tax the pay you gave up?

The answer differs by scheme. A salary sacrifice into a pension usually survives the crossing. One that buys you a car or a bicycle usually does not. What decides it is whether America recognises the thing you got in exchange.

Key takeaways

• Salary sacrifice reduces your contractual pay in exchange for a benefit.
• Britain saves you income tax and National Insurance on the amount given up.
• America decides each scheme on what you actually received.
• Pension sacrifice is usually protected by the treaty.
• Car, bicycle and most other schemes usually are not.
• The payslip figure is not automatically your American wage figure.
• Getting it wrong understates income rather than overstating it.

What is salary sacrifice?

It is a contractual change under which you give up part of your cash pay and your employer provides a non-cash benefit instead. According to HMRC guidance, the reduction must genuinely vary your employment contract. A deduction from pay you have already earned does not count.

That distinction matters more than people realise. A deduction takes money after it is yours, so the tax has already bitten. A sacrifice changes your entitlement in the first place. In British terms the money is never your pay at all.

Employers like salary sacrifice because they save National Insurance on the amount given up. That is why so many schemes cost you nothing on the face of it. It is also why the brochure calls it a benefit rather than a pay cut.

How much does it save in Britain?

Quite a lot, because salary sacrifice escapes income tax and National Insurance together. A higher rate taxpayer giving up £5,000 saves roughly £2,000 in income tax at 40 per cent and a further 2 per cent in National Insurance on top.

The employer saves as well, at 15 per cent of the sacrificed pay from April 2025. Many schemes pass some or all of that saving back to you, which is why a sacrifice arrangement can beat a straight contribution from net pay.

There are limits. You cannot sacrifice below the National Minimum Wage, and sacrificing too much can affect statutory pay, mortgage applications and the state pension record. Those constraints apply whatever your nationality.

How does America look at the same arrangement?

It asks what you received in exchange rather than what your payslip says. America has no concept matching salary sacrifice. So it tests each scheme against its own rules on whether that benefit escapes income.

Where the benefit falls into an American exclusion, the sacrifice effectively works on both sides. Where it does not, America treats you as having received the pay and then spent it, which puts the sacrificed amount straight back into your wages.

This is why one employer can offer three schemes with three different outcomes. Britain treats them all alike. America does not. So you work the answer out scheme by scheme, not once for the whole package.

A worked example

The figures below are illustrative. They use round numbers so you can follow each step and substitute your own.

Rachel is American and earns £90,000 in Leeds. She sacrifices £9,000 a year into her workplace pension and a further £4,800 for an electric car through her employer scheme. Her P60 shows pay of £76,200.

Britain taxes her on £76,200 and both sacrifices work exactly as intended. She has saved income tax at 40 per cent and National Insurance on the whole £13,800.

America accepts the pension sacrifice under the treaty, so that £9,000 stays out of her wages. It does not accept the car, because a leased vehicle for personal use is not an excluded benefit there. Her American wage figure is therefore £81,000, not the £76,200 on the payslip.

The £4,800 difference is taxable in America with no matching British tax to credit against it, because Britain never taxed it. That is roughly £1,500 of unrelieved American tax on a benefit she took for the British saving alone.

Which schemes usually survive?

Pension salary sacrifice is the strong case. The treaty protects contributions to a recognised British pension scheme for an American working here. An amount sacrificed into your workplace pension therefore escapes tax on both sides rather than just one.

The protection is not unconditional. The scheme has to qualify. The contributions have to sit within the limits the treaty contemplates. And you have to claim the position on the return rather than assume it.

Our guide to employer pension contributions covers the treaty mechanics in detail. The short version is that pension sacrifice is usually the one arrangement where the British saving carries across cleanly.

Which schemes usually do not?

Any salary sacrifice that hands you a thing rather than a retirement account. Car schemes, cycle to work, gym membership, technology purchases and most workplace perks fall outside the American exclusions, so the sacrificed pay goes back into your wages.

Electric car schemes are the common trap because they are currently so attractive in Britain. The benefit in kind rate on an electric car is low, so the British maths is excellent and the American maths is simply absent.

Our guide to benefits in kind covers how America values a car provided by an employer. The sacrifice does not change that analysis; it only changes where the money came from.

The main schemes compared

The table sets out the usual position for each. Every arrangement turns on its own documents, so treat this as the starting point rather than the answer.

Why does the mismatch cost real money?

Because America taxes the sacrificed amount and nobody else does. Britain charged nothing on it, so no British tax exists to claim as a foreign tax credit, and the American charge lands without relief of any kind.

That makes it one of the few genuinely unrelieved items an American in Britain faces. Most cross-border problems are arguments about timing or category, with the credit eventually doing its job. Here the credit has nothing to work with at all.

In our practice clients find this the most frustrating part, because somebody sold them the arrangement as a saving. The British saving is real. It is simply smaller than it looks once you count the American side.

Does the payslip tell you the right figure?

Not for American purposes. Your P60 shows pay after every sacrifice has come off, which is the correct British figure and the wrong starting point for a return that treats some of those sacrifices as income.

You therefore need the gross figure before sacrifice, broken down by scheme. Most payroll systems can produce it. It rarely appears on anything you receive automatically, so you have to ask.

Our guide to using a P60 on a US return covers the other adjustments the form needs. Salary sacrifice is the adjustment people miss most often, because nothing on the document hints that it happened.

What about the National Insurance saving?

You genuinely keep it, and America does not claw it back. National Insurance is a social security contribution rather than an income tax, so reducing it does not create an American charge in the way reducing income tax effectively can.

The indirect cost is to your contribution record. Sacrificing a large amount over many years can reduce the qualifying years counted towards your state pension, though most employees stay well above the threshold.

Our guide to voluntary National Insurance covers how to fill a gap if one appears. It is cheap to do and worth checking before a long run of heavy sacrifice.

Does it affect the foreign earned income exclusion?

It can, and in a direction people do not expect. Where America adds the sacrificed pay back into your wages, that extra income is still foreign earned income, so the exclusion can shelter part of it in the normal way.

The exclusion has a ceiling, though, and most people using large sacrifice arrangements earn well above it. Above the limit, every pound added back is taxable. That is exactly the group these schemes target.

Under the foreign tax credit the problem is sharper still.

Can you undo a sacrifice?

Usually only at a lifestyle event or at the scheme anniversary, because a salary sacrifice is a contractual variation rather than a standing instruction. Marriage, a new child, redundancy of a partner and similar events normally open a window.

That rigidity is worth knowing before you join. A car scheme typically locks you in for three or four years, and leaving employment early can trigger an early termination charge that nobody mentions at sign-up.

If you are American and weighing a car scheme, work out the combined position first. After you sign the lease, the American cost is fixed for the whole term.

Does a bonus sacrifice work the same way?

It can, and it is often the cleanest version. Sacrificing a bonus into the pension before it is paid avoids a large one-off tax hit here, and the treaty treats it the same as a monthly salary sacrifice into the same scheme.

The timing is what matters. You have to agree the sacrifice before you become entitled to the bonus. Agree it afterwards and HMRC treats the whole amount as paid to you, which removes the saving entirely.

Employers usually run a short window each year for this. Diarise it, because the window closes well before the bonus lands.

What if you are on a short assignment?

Then think twice before joining anything with a lock-in. A three year car lease outlasts a two year posting, and leaving the country does not release you from the arrangement or from the early termination charge.

Pension sacrifice is more flexible. You can usually stop contributing on short notice, and the fund stays invested whether or not you remain in Britain.

Our guide to a US secondment covers the wider assignment position.

Does it change your UK tax code?

Usually yes, because your taxable pay has fallen and any benefit in kind has to be coded in. HMRC adjusts the code to collect tax on the car or other benefit through payroll across the year.

That adjustment is a useful cross-check. If a benefit appears in your coding notice, America will almost certainly treat it as income too.

Read the coding notice when it arrives rather than filing it. It is the clearest list of what your employer is providing.

What if your employer gets it wrong?

A failed sacrifice is a British problem before it is an American one. Where the paperwork does not actually vary the contract, HMRC can treat the arrangement as a deduction from pay, which removes the tax and National Insurance saving entirely.

That outcome is rare with established schemes run through payroll providers. It is more common with informal arrangements agreed by email, particularly in small companies where the documentation never caught up with the intention.

Ask to see the variation letter before you join anything. If your employer cannot produce one, the scheme may not be what either of you thinks it is.

What records do you need?

The variation letter for each scheme, an annual statement showing the amount sacrificed, and a payroll breakdown of gross pay before any sacrifice came off. Those three between them let you rebuild the American wage figure without guesswork.

Ask for the breakdown each April while the payroll year is fresh. Chasing a figure from a previous employer eighteen months later is considerably harder, and the people who ran the scheme have often moved on.

Keep the car lease documents as well where one exists. The American valuation of the benefit depends on the vehicle and the term, not on what you sacrificed for it.

How to handle it on the return

1. Get your gross pay figure before any sacrifice was deducted.
2. List each scheme and the amount sacrificed into it during the year.
3. Separate the pension sacrifice from everything else.
4. Confirm the pension scheme qualifies for treaty protection.
5. Add every non-pension sacrifice back into your American wages.
6. Value any car or other benefit under the American rules, not the British ones.
7. Check whether the exclusion or the credit gives the better result.
8. Keep the variation letters with that year's papers.

Mistakes and penalties we see with salary sacrifice

The first is reporting the P60 figure straight onto the American return. It is the right number for Britain and an understatement for America wherever a non-pension scheme is running.

The second is assuming the treaty covers everything because it covers the pension. The protection is specific to retirement savings and does not stretch to a car or a bicycle.

The third is joining an electric car scheme on the British numbers alone. The saving is real here and partly reversed there, which can turn a good deal into a marginal one.

The fourth is forgetting that an understatement carries interest and penalties even where it was entirely innocent. Wages are the figure most easily checked, so this is not a quiet error.

How US UK Tax Accountants helps

We work through each scheme in your package separately, confirm which ones the treaty actually protects, and rebuild the American wage figure from the payroll data rather than the payslip. Then we model the exclusion against the credit on the corrected numbers.

Where a scheme has been running unreported for a few years, we look at what needs correcting and whether an amendment is worthwhile. Our US federal return service covers the filing.

If HR has offered you a car or a cycle scheme and you file in America, get in touch before you sign. The combined answer is usually different from the one in the brochure.

Last reviewed 9 October 2026. This article is general information and not personal tax advice. Every scheme turns on its own documents, so take advice on yours before joining.