Do I have to report income on my US return if it is under the UK £1,000 trading allowance?

Yes. The trading allowance is a UK exemption only. A US citizen or green card holder reports worldwide income on Form 1040, so trading receipts of £1,000 or less that HMRC never asks about are still reported in dollars at their gross amount, with only actual, evidenced expenses deducted. Regular business activity goes on Schedule C, and an isolated receipt on Schedule 1 as other income.

Can I use both the UK trading allowance and the property allowance in the same tax year?

Yes. HMRC's guidance confirms that an individual with both trading income and property income gets a £1,000 allowance for each. They are separate allowances and are tested separately against gross income of each type. Joint owners of a let property can each claim the property allowance against their own share of the gross rent.

Can I use the UK trading allowance on fees paid by my own company or my employer?

No. HMRC states that the allowances cannot be used in a tax year in which you have trade or property income from a company you or a connected person owns or controls, from a partnership in which you or a connected person is a partner, or from your employer or your spouse's or civil partner's employer. That income is reportable in the UK.

If I let my UK holiday home for under 15 days, is the rent on my US return?

Generally not, provided you also use the property as a residence. The IRS explains that where a dwelling unit is used as a residence and rented for fewer than 15 days in the year, the rental income is not reported and rental expenses are not deducted. The UK has no equivalent day-count rule, so the same rent can still be taxable in the UK.

What should I do if past US returns omitted income covered by a UK allowance?

A filed return is corrected on Form 1040-X, reporting the omitted income in dollars with any evidenced expenses and recomputing foreign tax credits and self-employment tax. The IRS adjusts interest and penalties itself. Someone who has not filed US returns at all, and whose failure was non-wilful, would normally include the income in a Streamlined Foreign Offshore Procedures submission instead.

US Expat Tax Returns: UK Trading & Property Allowances

Q: Does US self-employment tax apply to a small UK side income?

It can. The IRS states that self-employment tax is due when net earnings from self-employment are at least $400, whether you live in the United States or abroad, and the foreign earned income exclusion does not reduce it. Exemption depends on the US-UK social security agreement and on holding a certificate of coverage, a copy of which is attached to Form 1040.

US tax return preparation for expats living in the UK has to pick up income that the UK tax system deliberately ignores: the first £1,000 of trading income and the first £1,000 of property income in each tax year. The short answer is that the UK trading allowance and property allowance have no US counterpart. A speaking fee, an online sale or a few weeks of rent that HMRC never asks about is still gross income on Form 1040 from the first dollar, and because the UK has charged no tax on that receipt, it brings no foreign tax credit of its own with it.

In the returns we prepare for Americans in London and the South East, this rarely concerns the main income. The gap opens on the incidental receipts of people who earn a great deal elsewhere: a managing director paid for a conference panel, a founder who sells studio equipment online, a couple who let the parking space beside their flat, or a family who let a coastal house for two weeks in August. Each has been told, correctly, that the UK does not need to hear about it. Nobody has told them that the United States does.

What are the UK trading allowance and property allowance?

The trading allowance is a UK tax exemption of up to £1,000 a year for individuals with trading income. The property allowance is a separate UK tax exemption of up to £1,000 a year for individuals with income from land or property. Both have applied since 6 April 2017, and HMRC's guidance at https://www.gov.uk/guidance/tax-free-allowances-on-property-and-trading-income confirms that someone with both types of income gets a £1,000 allowance for each. They are two allowances, not one shared pot.

HMRC describes the trading allowance as covering three kinds of receipt, and the wording matters because it is wider than a formal business:

Income from self-employment, which for our readers usually means occasional consulting, writing, speaking or non-executive work billed personally rather than through a company.
Income from casual services. HMRC's own examples are modest ones such as gardening, but the category is the same one that catches a one-off paid engagement.
Income from hiring out personal equipment. HMRC's example is power tools; the high-net-worth equivalent is camera equipment, a classic car hired for a film shoot or a boat hired out for a weekend.

The trading allowance does not apply to trading income from a partnership. The property allowance covers income from land or property generally, so it reaches receipts that people do not think of as being a landlord at all: a driveway or garage let to a commuter, a field let for grazing or an event, or a short let of a second home. Where a property is jointly owned, HMRC states that each owner is eligible for the £1,000 allowance against their own share of the gross rental income, so a married couple who jointly own a let parking space have £2,000 of allowance between them.

What is the difference between full relief and partial relief?

Full relief applies where gross income of the relevant type is £1,000 or less for the tax year. The income is simply exempt, and in general there is nothing to tell HMRC and nothing to enter on a return. Partial relief applies where gross income is more than £1,000. The individual can then choose to deduct the allowance from gross income in place of actual expenses and capital allowances. HMRC's wording is that you can deduct up to £1,000, but not more than the amount of your income.

Two points are routinely misread. First, the test is on gross income, meaning total receipts before any expenses, not profit. A reader who takes £1,400 in speaking fees and spends £600 on travel is outside full relief, even though the profit is £800. Second, partial relief is a substitute for expenses, not an extra deduction. If actual costs are higher than £1,000, claiming them in the normal way gives the better UK answer, and HMRC says so directly.

The property allowance looks at gross property income in total. Rent from a parking space and rent from a short let of a second home are added together before the £1,000 test is applied, which is how two small receipts that each look exempt end up outside full relief.

When do you not need to register for Self Assessment or tell HMRC?

HMRC's guidance sets the reporting position by the size of the gross receipt. Most of our readers are already inside Self Assessment because of their employment and investment income, so for them the practical question is whether the item goes on the return, not whether to register. The published position is:

Gross trading income of £1,000 or less: no need to tell HMRC or declare it, subject to the exceptions below.
Gross trading income over £1,000: you must register for Self Assessment, and the guidance gives 5 October following the end of the tax year as the registration deadline.
Gross property income of £1,000 or less: no need to tell HMRC, and it is not declared on a return even if you file one for other income.
Gross property income over £1,000 and up to £2,500: contact HMRC.
Gross property income over £2,500: register for Self Assessment.
Already registered and over £1,000: deduct the allowance from gross income on the return, with no other expenses or allowances against that income.

One requirement survives full relief. HMRC states that if you use the allowances you must keep records of the income, such as invoices, payment confirmations and bank statements. In practice almost nobody does this for a receipt they have been told is tax-free, which becomes the central problem when the US return is prepared.

When can you not use the trading or property allowance?

This is the part of the guidance that catches executives and business owners, because the exclusions are aimed squarely at people who could otherwise route money to themselves through an allowance. HMRC says you cannot use the allowances in a tax year in which you have trade or property income from any of the following:

A company you own or control, or one owned or controlled by someone connected to you. A founder who invoices their own company for a small consulting fee, or lets it a garage or a room for storage, gets no allowance on that income.
A partnership in which you or someone connected to you is a partner.
Your employer, or the employer of your spouse or civil partner. A banker who lets a parking space to the bank, or is paid separately by the employer for a talk, falls outside the allowance.

The property allowance has further limits of its own. HMRC states that it cannot be used if you claim the tax reducer for finance costs, such as mortgage interest, on a residential property, and that it cannot be used against income from letting a room in your own home under the Rent a Room Scheme, which is a separate relief outside the scope of this article. A reader with a mortgaged second home that is let for part of the year therefore has a choice to model: the allowance, or actual expenses together with the finance cost reducer.

How does US tax return preparation for expats treat income the UK ignores?

The US taxes its citizens and green card holders on worldwide income wherever they live, a principle the IRS sets out on the page at https://www.irs.gov/individuals/international-taxpayers/foreign-earned-income-exclusion alongside the exclusion rules. There is no US rule that exempts the first slice of side income, and no US rule that follows a UK exemption. A receipt that is fully relieved in the UK is reported on Form 1040 at its gross amount, with US rules deciding what can be deducted against it.

Where it goes on the return depends on what it is. Income from a trade or business carried on with regularity, such as recurring consulting or a steady line of online sales, is reported on Schedule C with its expenses. Rent from real property is reported on Schedule E. A genuinely isolated receipt that is neither a business nor rent is reported as other income on Schedule 1. The classification decides whether self-employment tax is in point, which foreign tax credit category the income sits in, and whether the foreign earned income exclusion can touch it.

A second difference is the year. The UK allowances are measured over the UK tax year, which runs from 6 April to 5 April, while the US return covers the calendar year. A reader can be within full relief in two consecutive UK tax years and still have a larger figure on a single US return.

A third is the measure of profit. Under partial relief the UK allows a flat £1,000 in place of expenses. The US allows only actual, substantiated expenses, so a reader who took the UK allowance and kept no receipts can find the US taxable amount is the gross receipt.

Does US self-employment tax apply to a small UK side income?

It can, and at a far lower level than the UK allowance. The IRS states at https://www.irs.gov/individuals/international-taxpayers/self-employment-tax-for-businesses-abroad that you must pay self-employment tax if your net earnings from self-employment are at least $400, and that the rules are generally the same whether you live in the United States or abroad. A UK-resident American with £900 of consulting fees is well inside the UK trading allowance and comfortably above the US threshold.

The foreign earned income exclusion does not solve this. Self-employment income earned by a qualifying individual abroad can be foreign earned income, but the IRS is explicit that the excluded amount reduces regular income tax and does not reduce self-employment tax. Nor does the foreign tax credit help here: the credit is a credit against income tax, not against self-employment tax.

The relief, where there is one, comes from the social security agreement between the United States and the United Kingdom. Agreements of this kind, which the IRS calls totalization agreements, exist so that social security taxes, including self-employment tax, are paid to only one country. The IRS explains at https://www.irs.gov/individuals/international-taxpayers/totalization-agreements that a person claiming exemption from US social security taxes must secure a certificate of coverage from the social security agency of the other country. The self-employment page adds the mechanics: attach a photocopy to Form 1040 for each year the exemption is claimed, and write Exempt, see attached statement on the self-employment tax line.

Here is the gap that few guides address. An American whose side income is fully covered by the UK trading allowance has usually not registered as self-employed with HMRC. The exemption from US self-employment tax rests on a certificate, not on an assumption. Where no certificate is held, we do not claim the exemption: the reader either obtains one from the UK authorities first, or the tax is computed on Schedule SE and paid. For a high earner the amount is small, and asserting an exemption with no document behind it is not worth the exposure.

Does the 15-day vacation home rule take UK holiday lets off the US return?

Sometimes, and it is the one place where the US rule is more generous than the UK one. The IRS explains at https://www.irs.gov/taxtopics/tc415 that if you use a dwelling unit as a residence and rent it for fewer than 15 days in the year, you do not report any of the rental income and do not deduct any expenses as rental expenses. This is the rule in section 280A(g) of the Internal Revenue Code. It has no monetary cap: what matters is the number of days, not the amount of rent.

Both conditions have to be met. The property must be a dwelling unit that you use as a residence, which the IRS defines as personal use for more than the greater of 14 days or 10% of the days it is rented to others at a fair rental price. And the rental must be fewer than 15 days. A second home in Cornwall or the Cotswolds that the family uses for several weeks and lets for a fortnight can meet both tests. Let it for 15 days or more and the rule falls away: the rent is reportable on Schedule E, with expenses divided between rental and personal use.

Two limits are worth stating plainly. A parking space, garage or piece of land let on its own is not a dwelling unit used as a residence, so its rent is reportable on Schedule E whatever the number of days. And the rule can produce a mirror image of the UK position: a short let of a second home can be fully taxable in the UK yet absent from the US return, while a £900 parking space is ignored by the UK and reported to the IRS. The IRS also notes on the same page that rental income may be subject to the net investment income tax.

Why is there often no foreign tax credit on allowance-covered income?

The foreign tax credit is a credit for foreign income tax actually paid or accrued. Income that is fully relieved by a UK allowance has borne no UK tax, so it generates no credit of its own. Whether US tax is actually payable on it then depends on what else is on the return, and this is where a high earner's position differs from the textbook case.

The credit is computed separately for different categories of income. Many of our readers take the credit on their UK salary and bonus, and because UK income tax at higher rates commonly exceeds the US tax on the same earnings, they carry surplus credits in the category that holds earned income. Foreign-source consulting or speaking income generally sits in that same category, so the surplus can absorb the US income tax on it, although the self-employment tax question remains.

Rent is different. It generally falls into the passive category, where a reader may have little or no surplus UK tax, so US income tax on a UK-exempt parking space can be payable in full at the reader's marginal rate. Readers who use the foreign earned income exclusion on their salary in place of the credit have no surplus credits at all. For them, self-employment income may fit within any unused part of the exclusion, which the IRS notes is adjusted annually for inflation, but rent cannot, because rent is not earned income.

How do you convert the pounds, and what records should you keep?

Amounts on a US return must be expressed in US dollars. The IRS states at https://www.irs.gov/individuals/international-taxpayers/yearly-average-currency-exchange-rates that it has no official exchange rate and generally accepts any posted exchange rate that is used consistently. The general rule is the spot rate on the day an item is received or paid, and the IRS also publishes yearly average rates. For the United Kingdom pound the published yearly average for 2025 is 0.759, used by dividing the sterling amount by the rate.

Because HMRC asked for nothing, the record usually has to be rebuilt. For each receipt the US return needs:

The date and gross amount of every payment, from bank or payment platform statements.
Who paid it, so that payments from an employer or the reader's own company can be identified.
For rentals, a calendar of days let at a fair rent and days of personal use.
Evidence of actual expenses such as travel, platform fees, insurance and cleaning. The UK flat allowance is not a US deduction.
For goods sold, what was sold and what it cost.
Any certificate of coverage, or the correspondence showing it has been requested.

A worked scenario: one executive, three receipts

The following is an illustration only. The person and figures are invented, and the exchange rate is an assumption: we use the IRS yearly average rate for 2025 of 0.759 pounds to the dollar for every item, and assume for simplicity that all three receipts fall in both the 2025 calendar year and a single UK tax year.

A US citizen works as a managing director at a London investment bank and files UK Self Assessment because of her employment income. During the year she receives £900 from an unconnected conference organiser for speaking on a panel, £950 from a neighbour for the use of the parking space attached to her flat, and £2,400 for letting the family's house in Cornwall for 10 nights in August. The family used that house themselves for 35 days in the year. She has no mortgage on either property and kept no expense records.

UK position. The £900 fee is gross trading income of £1,000 or less from a payer who is not her employer or her own company, so the trading allowance gives full relief and it is not declared. Her gross property income is £950 plus £2,400, a total of £3,350. That is above £1,000, so full relief is not available on any of it, and above £2,500, so it belongs on her Self Assessment return. She can choose partial relief and deduct £1,000, leaving £2,350 taxable, or claim actual expenses if she can evidence more than £1,000 of them.

US position. The speaking fee converts to about $1,186 and is reported in full. If panel work is something she does with regularity, it belongs on Schedule C, and with no substantiated expenses the net earnings exceed $400, so Schedule SE applies unless she holds a UK certificate of coverage. Surplus credits from the UK tax on her salary may absorb the income tax on it. The parking space rent converts to about $1,252 and is reported on Schedule E; it is not a dwelling unit, so the short-rental rule is irrelevant. The Cornwall rent converts to about $3,162, but the house is used as a residence, since 35 days of personal use exceeds the greater of 14 days and 10% of the 10 rental days, and it was let for fewer than 15 days. That rent is not reported and no rental expenses are deducted.

The result is that the two items the UK would have ignored on their own are the two the US taxes, and the item the UK taxes is the one the US leaves out.

What if earlier US returns left this income out?

Most readers who discover this have filed US returns every year in good faith and never mentioned income they were told was exempt in the UK. The route for a filed return that needs correcting is Form 1040-X. The IRS explains at https://www.irs.gov/taxtopics/tc308 that Form 1040-X is used to correct a previously filed return when income, deductions, credits or tax liability change, that it can be filed electronically, and that a taxpayer amending after the due date should not include interest or penalties on the form because the IRS will adjust them.

Readers who have not been filing US returns at all are in a different position. For those whose failure was non-wilful and who meet the non-residency conditions, the Streamlined Foreign Offshore Procedures are the usual route to catch up, and that foreign version of the procedures carries no penalty. The side receipts are included in the returns submitted, with the same classification and conversion work.

What does this mean for the return we prepare?

Our intake questions for UK-resident Americans ask about every receipt outside payroll and the investment accounts, and specifically about anything the reader was told needed no UK reporting. We test each item against the UK conditions, classify it for US purposes, check day counts on any let property and confirm whether a certificate of coverage is held. The UK allowances simplify UK tax. For a US citizen they only remove the paper that the US return depends on. If you have side receipts of this kind, our US-UK tax preparation and compliance team can bring both returns into line.