US UK Accountants: Fixing a Missed 60-Day Property Return

To put right a missed 60-day UK property return, file it now, pay the tax and interest, then contest any unfair penalty. An American seller must also report the sale on Form 1040, where the payment date can decide whether the UK credit works. US UK accountants treat both as one job.

Most commentary on this deadline stops at the HMRC penalty ladder, and most commentary for Americans mentions the deadline in a single line before moving on to the US gain. Neither answers the question a late seller actually has: if I pay HMRC two years late, what happens to my dollar credit? This guide, written by the cross-border team at Jungle Tax, is built around that gap. It also covers a new development that older pages cannot: draft legislation published on 28 October 2026 which changes when late filing penalties stop.

It assumes you have already sold. For how the US taxes a London sale in the first place, including the Section 121 exclusion and mortgage currency gains, see our separate guide on Americans selling UK property.

Who should have filed the 60-day return?

The duty sits in Schedule 2 to the Finance Act 2019. It depends on where you were resident for UK tax, not on your passport.

• Non-resident Americans must report all sales and disposals of UK property or land, residential or not, within 60 days of completion, even with a loss or no tax due. A New York resident who sold a Chelsea flat at a loss still had a return to make.
• UK-resident Americans must report and pay within 60 days where a residential sale produces a taxable gain. A sale with no tax due on account, for example a fully relieved main home, usually needs no return.
• Joint owners each report their own share. A British spouse and an American spouse therefore have two UK returns, but only the American share belongs on a US individual return if they file separately.

Both limbs run from completion, under the GOV.UK reporting guidance. One trap for cross-year deals: the UK generally fixes the date of disposal at exchange of an unconditional contract, so a sale exchanged on 28 March and completed on 20 April falls into the earlier tax year while its 60 days run from April. The US normally looks to closing. Establish both dates from the completion statement before anything else, because the rate, the annual exempt amount and the US tax year all hang on them.

The separate online account, and why it delays people

The return does not go through your Self Assessment login. It needs a dedicated Capital Gains Tax on UK property account, which sits behind a Government Gateway sign-in. Americans abroad often lose weeks here because identity checks lean on UK records they do not have. Where the online service cannot be used, GOV.UK provides a form to complete, print and post, after which HMRC issues a 14-character payment reference starting with X.

That matters more than it sounds. Without a reference, tax cannot be properly allocated, and as explained below the US consequences turn on the date the money is paid. If you are approaching a calendar year-end, the postal route may be too slow, so build in time or have an authorised agent start the online route straight away. Note also that the online service cannot change a return for 2023 to 2024 or earlier, or any return once a Self Assessment return for that tax year has gone in.

What does a late 60-day return actually cost?

There are three layers: late filing penalties under FA 2009 Schedule 55, late payment penalties under FA 2009 Schedule 56, and interest. Many pages blur the second layer. Schedule 56 item 3B sets the penalty date for tax due on a property return at 30 days after 31 January following the tax year of disposal, so late payment penalties start much later than the 60-day deadline. Interest does not wait.

We built the table below from the legislation, applied to the illustrative sale in our worked example: completion on 18 February 2025, UK tax of £134,400.

Trigger	UK consequence	Date in example	Amount in example
60th day after completion	Return and payment on account due	19 April 2025	£134,400 tax due
Day after deadline (Sch 55 para 3)	Fixed penalty of £100; interest begins	20 April 2025	£100
3 months on (para 4)	£10 a day for up to 90 days, only if HMRC decides and gives notice	From 20 July 2025	Up to £900
6 months on (para 5)	Greater of 5% of tax shown or £300	After 19 October 2025	£6,720
12 months on (para 6)	Greater of 5% or £300; far higher percentages if information is deliberately withheld	After 19 April 2026	£6,720
30 days after following 31 January (Sch 56 item 3B, para 3)	5% of unpaid tax	2 March 2026	£6,720
5 months after that date	Further 5% of unpaid tax	After 1 August 2026	£6,720
11 months after that date	Further 5% of unpaid tax	After 1 February 2027	Avoided if paid first

A nil-tax non-resident return falls to the fixed amounts only: at most £100, £900, £300 and £300, or £1,600 in total. Payable tax is where the percentages bite.

Interest

Interest runs on unpaid tax from the day after the deadline at HMRC's published late payment rate, which has been 7.75% since 9 January 2026. It was 8.50% from 6 April 2025, 8.25% from 28 May 2025 and 8.00% from 27 August 2025. Check the current rate on the day you pay, because it moves with the base rate.

The October 2026 change: when do penalties now stop?

Until now, a seller who skipped the property return and reported the sale on Self Assessment could find the penalty clock still running with no return left to file. On 28 October 2026 HMRC published a policy paper and draft clauses for Finance Bill 2026 to close that loop.

The draft inserts a new paragraph 5A into Schedule 2 and a new paragraph 4(4) into Schedule 55. If you miss the filing date and later deliver an ordinary tax return with a self-assessment taking account of the disposal, you cease to be required to deliver the property return from that time, and the failure stops continuing for the purposes of the daily, six-month and twelve-month penalties. It applies where the ordinary return is delivered on or after 28 October 2026.

Four cautions for anyone reading this as a way out:

• It is draft law as we publish. The clause still has to pass through Parliament, and the policy paper's own wording is not fully consistent about whether the filing requirement is removed. Check the enacted text.
• It only stops the clock. Penalties already triggered appear to remain due, and interest on the tax continues to accrue until the tax is paid.
• The self-assessed tax must be at least the amount due on the property return, since paragraph 5(2) is applied. An understated return will not qualify.
• It helps sellers who are in Self Assessment. A non-resident outside the system should not assume an annual return is the faster route, and a return for an earlier year may already be out of time for a simple filing.

A timing example: a UK-resident American completes on 10 January 2026, so the deadline is 11 March 2026. If the 2025 to 2026 Self Assessment return taking account of the sale is delivered in August 2026, before the six-month point, the draft rule would prevent the 5% penalties arising, leaving £100, any daily penalty already notified, and interest. Had the seller waited until January 2027, both percentage steps would already have been reached.

How does the late return reconcile to Self Assessment?

The 60-day return is a payment on account, not the final word. How it reconciles depends on your position:

• Already in Self Assessment, annual return not yet filed. File the property return if you still can, then carry the sale into the SA108 pages. Non-residents use box 52.1 onwards and quote the property return references in the additional information section, per Helpsheet HS307. The tax on account is then set against the annual liability.
• Annual return already filed and it included the gain. You generally cannot now make or amend the property return. Pay any balance, deal with the penalties, and rely on the Self Assessment figures.
• Annual return already filed without the gain. Amend it if the window is open, and take advice if it has closed, because a further route and possibly a failure-to-notify issue arise.
• Not in Self Assessment. The property return may be the only UK filing. Under paragraph 19 of Schedule 2 it can be amended for facts existing at the original filing, but no later than 12 months after the ordinary return deadline for that year. HMRC can also open an enquiry, and can issue a determination of tax within three years of that deadline if nothing has been filed.

Overpayments are repaid under the paragraph 8 mechanism or through Self Assessment. Overstating the UK tax on purpose is pointless for the US side, since only tax you are legally liable for supports a credit.

Which rates apply to the late return?

The rate is the one for the date of disposal, not the date you file. Current GOV.UK rates show 18% within the basic rate band and 24% above it, with a £3,000 annual exempt amount for 2026 to 2027. Residential gains were at 18% and 28% before 6 April 2024, when the higher rate fell to 24%, and the exempt amount was £6,000 in 2023 to 2024. Going back to an older sale means using its own year's figures. A non-resident who owned on 5 April 2015 normally uses that date's market value for a direct residential disposal, and that valuation should be evidenced, not estimated after the fact.

The same sale on Form 1040: Schedule D and Form 8949

The US reports the sale whether or not HMRC has been told. For a second home held over a year and sold at a gain, the entry is Form 8949, typically Part II with the box for long-term transactions not reported on Form 1099-B, flowing to Schedule D. Points that catch people:

• Currency. Cost and costs of purchase are translated at the rate for the acquisition date, and proceeds and selling costs at the rate for the sale date. You do not translate the sterling gain.
• Rebasing does not cross the Atlantic. A 2015 UK valuation has no place on Form 8949. US basis starts from original cost.
• A let flat is different. Depreciation allowed or allowable reduces basis, whether you claimed it or not, and the sale may go through Form 4797 with unrecaptured Section 1250 gain taxed at up to 25%. If you never filed Schedule E for the rental years, that is part of the same compliance problem.
• A personal-use loss is generally not deductible, even though HMRC still expects the report.
• The proceeds create their own filings. Sterling landing in a UK account can push the maximum value over FBAR and Form 8938 thresholds that year. Our FBAR penalty calculator shows why this should not be left outstanding.

What happens to the US credit when the UK tax is paid late?

This is the point no general guide we reviewed deals with, and it can cost more than HMRC's penalties.

The cash-method problem

Most individuals are on the cash method for foreign tax credits, so the UK tax is creditable in the year it is paid, not the year of sale. IRS Publication 514 and the Form 1116 instructions allow unused foreign tax to be carried back one year and forward ten. A seller who pays on time, in the same year as the sale, never notices this. A seller who pays late has moved the credit away from the income, and the carryback can reach only one year.

Completion date	US gain year	If UK tax paid in 2026	If UK tax paid in 2027
During 2024	2024	Credit arises 2026; carryback reaches 2025 only, so the gain year is missed	Missed
During 2025	2025	Credit arises 2026; carryback reaches 2025	Credit arises 2027; carryback reaches 2026 only, so the gain year is missed
During 2026	2026	Same year; no mismatch	Carryback reaches 2026

This table assumes the cash method. A credit that misses the gain year does not vanish, but it can only be used where the later year has foreign-source income in the same category. For a one-off sale there usually is little, so the seller pays full US tax on the gain and also full UK tax. For a 2025 sale still unpaid today, the practical date is therefore 31 December 2026: pay by then and the carryback still reaches the gain. A carryback also means the US tax is paid first and recovered later on Form 1040-X, so allow for the cash flow.

Can the accrual election rescue it?

Accrual taxpayers claim the credit in the year the foreign tax accrues, and under Treasury Regulation 1.905-1 tax tied to a foreign tax year generally accrues at the close of that year. For UK tax that means 5 April. Three limits apply:

• The election is generally made on a timely filed original return. A first-time claimant may also make it on an amended return. Whether a delinquent original return filed under the streamlined procedures qualifies is not addressed in terms, and we would take a documented position rather than simply tick the box.
• It is irrevocable and governs all later years, including every future UK income tax payment. For an American living in the UK that can be either helpful or awkward.
• Tax accrued but not paid within 24 months after the close of the US tax year must be taken out of the credit until paid, under the redetermination rules.

Note the mismatch even on accrual: tax on a sale completed in September 2024 accrues on 5 April 2025, in US year 2025, so it would reach the 2024 gain only through the one-year carryback.

Exchange rates and what is not creditable

Tax paid on the cash method generally translates at the rate on the payment date. Accrued tax generally uses the yearly average, unless paid more than two years after the year-end. The IRS yearly average for 2025 is 0.759 pounds per dollar. Interest and penalties paid to HMRC are not creditable at all, which Publication 514 states directly. UK tax above the US tax on the gain produces an excess, tracked on Schedule B of Form 1116, and high-taxed gain can move from the passive to the general category. The credit also generally does not reduce the 3.8% Net Investment Income Tax under IRS regulations. Treaty-based claims against that tax are contested and require individual review.

Does the sale affect a streamlined submission?

Very often the American who missed the UK return also has unfiled US returns. The UK failure does not bar the Streamlined Filing Compliance Procedures, which are closed by an open IRS civil examination or a criminal investigation, and which turn on non-willful conduct. Our IRS streamlined filing team sees four issues repeatedly:

• Is the sale in the window? The Foreign Offshore Procedures need Forms 1040 for the most recent three years with passed due dates and six years of FBARs. In November 2026 that normally means 2023, 2024 and 2025. A 2026 sale is not in the window and belongs on a normal, timely 2026 return.
• The tax must be paid with the submission. Full tax and statutory interest go with the package. If a cash-method credit has not yet arisen, the US tax on the gain is computed without it and later recovered, so the sale can dominate the cheque.
• Two narratives, one set of facts. A reasonable excuse appeal to HMRC and a Form 14653 certification to the IRS describe overlapping events. The two tax authorities exchange information under treaty. Saying to HMRC that your adviser dealt with everything and to the IRS that you had no idea a filing existed creates a problem that neither penalty is worth. Draft them together.
• US-resident sellers face a different route. The Domestic Offshore Procedures need previously filed returns, do not accept delinquent original Forms 1040, and carry a 5% miscellaneous offshore penalty on the highest year-end value of subject foreign financial assets. Directly held property is not among the IRS's listed examples, but a UK account holding sale proceeds at a year-end may well be.

Outside these procedures, the ordinary US late-filing penalty can reach 5% a month up to 25% of the unpaid tax, with a separate late-payment charge. On a six-figure US liability that is why fixing the US side alongside the UK side is worthwhile, not an afterthought. US returns are due 15 April, with an automatic extension to 15 June for those living abroad.

Worked example: sterling gain against dollar gain

All figures are illustrative, chosen by us, with assumed exchange rates. Your own rates and facts will differ.

Dana, a US citizen resident in Connecticut, bought a London flat as a second home in June 2016. She never let it, took no mortgage, and has UK income that uses no basic rate band for this purpose. She completed the sale on 18 February 2025, filed nothing in either country, and is sorting it out in November 2026.

Item	UK (sterling)	Assumed rate	US (dollars)
Proceeds	£2,100,000	1.26	$2,646,000
Selling costs	(£42,000)	1.26	($52,920)
Purchase price	(£1,400,000)	1.44	($2,016,000)
Purchase costs	(£95,000)	1.44	($136,800)
Gain	£563,000		$440,280
Annual exempt amount 2024 to 2025	(£3,000)		n/a
Tax rate	24%		20% (assumed top long-term rate)
Tax before credit	£134,400		$88,056
Net Investment Income Tax at 3.8%	n/a		$16,731

The pound's fall since 2016 makes her dollar gain, about £349,000 at the sale rate, far smaller than her sterling gain. That alone guarantees excess UK tax.

UK extras if she files and pays on 16 November 2026: filing penalties of up to £14,440 (£100, £900 if notified, £6,720 and £6,720), late payment penalties of £13,440, and interest of about £16,834 over 576 days at the rates above. That is roughly £44,714, or about $59,470 at an assumed 1.33, with no US credit for any of it.

US position. Paying in November 2026 at an assumed 1.33 gives £134,400 = $178,752 of creditable tax in 2026. Dana is non-willful and a US resident, so assume she files an ordinary late 2025 return. Her simplified limit on the gain is about $88,056, recovered through the carryback from 2026 once the 2026 return is in. The remaining $90,696 or so is a carryforward she may never use. Had she also been eligible for accrual on the 2025 return, the figure would translate at the yearly average: £134,400 divided by 0.759 = $177,075.

The cost of delay. If she paid HMRC in January 2027 instead, the credit would arise in 2027, and carryback would reach only 2026. Her $88,056 of US tax would stand unrelieved on 2025, while she still paid £134,400 to HMRC. A few weeks of delay would then cost more than every UK penalty and all the interest combined. This is a simplified result: the real Form 1116 limit depends on total income, capital gain adjustments and category rules.

The UK and US compared

Issue	UK (HMRC)	US (IRS)
Filing	Property return within 60 days of completion; SA108 if in Self Assessment	Form 8949 and Schedule D on Form 1040; Form 4797 if let
Date that matters	Exchange for tax year; completion for deadline	Generally closing date
Currency	Sterling	Dollars, at each transaction's own rate
Top rate on gain	24%	20% plus 3.8% NIIT; 25% on depreciation recapture
Relief for other country's tax	Not usually relevant; the UK has the first right to tax UK land	Form 1116, limited to US tax on the gain
Late filing	Sch 55: £100, daily, then 5% or £300 twice	Failure-to-file up to 25%; relief under streamlined if eligible
Defence	Reasonable excuse; special reduction	Reasonable cause; non-willful certification

Can the penalties be reduced?

Liability does not arise if you satisfy HMRC or the tribunal that you had a reasonable excuse, under Schedule 55 paragraph 23, with a parallel rule in Schedule 56. Insufficient funds will not do unless caused by events outside your control. Relying on someone else will not do unless you took reasonable care to avoid the failure. Once the excuse ends, the failure must be fixed without unreasonable delay, so a client who learns of the deadline and waits six months has probably spent the argument.

Ignorance of the law is contested territory for a sophisticated seller with advisers on the transaction. The stronger cases usually rest on specifics, such as what a conveyancer or adviser actually said, an overseas seller's real access to UK systems, or a serious illness. Appeals generally must be made within 30 days of the notice. HMRC may separately reduce a penalty for special circumstances under paragraph 16, though not for inability to pay, and a time-to-pay agreement can suspend Schedule 56 penalties under its paragraph 10. Any payment plan should be weighed against the US year-end date, because tax not yet paid is not yet creditable.

The order we work in

1. Fix the facts. Exchange and completion dates, residence status for the tax year, ownership split, costs, and any earlier valuation.
2. Compute both gains at once, in sterling and dollars, so the credit outcome is known before any money moves.
3. Find the US date that matters. Identify the last day UK payment still reaches the gain year, and work back from it.
4. Open the property account and file, or use the annual return where it is genuinely the correct route.
5. Pay HMRC and keep the proof. The return, payment reference and bank confirmation support Form 1116.
6. File the US returns, with Form 8949, Schedule D, Form 1116, and FBAR and Form 8938 for the proceeds, inside the streamlined procedures if eligible.
7. Appeal on consistent facts once the numbers and the IRS certification are settled, within the 30-day period of any notice.

You can see the wider service on our US-UK tax accountants and US tax services pages.

Putting it right, privately

A late 60-day return is a repairable problem, but the repair has a date attached, and that date is set by the US calendar as much as by HMRC. If you sold a London flat or a second home and one or both countries have not been told, contact our cross-border team for a confidential consultation. We will prepare both sides, in the right order, and tell you plainly what it will cost.