Selling UK property from abroad? You have 60 days and your solicitor probably won't tell you

Completion day arrives with a wire transfer and a bottle of something, not a tax briefing. Conveyancers do conveyancing; the standard letters say nothing; and so, in our experience, roughly half of non-resident sellers first meet the 60-day rule as a penalty notice months later. It is the most needlessly-paid penalty in expat tax, because compliance is genuinely straightforward — if anyone tells you the rule exists.

The rule, precisely

Since 2015 the UK has taxed non-residents on gains from UK residential property (2019 for commercial and for 'property-rich' company shares). The enforcement mechanism is the deadline: a standalone return plus a payment on account of the tax, due within 60 days of completion — not exchange. And the part that separates you from your UK-resident friends: they file only when tax is due; non-residents file every time, profit, loss or dead level. A nil return, late, still collects penalties.

What filing well looks like

The return itself is short. The value is in the computation, because non-residents get choices residents don't — the charge only reaches back to April 2015, so you can compute the gain from the property's April 2015 market value ('rebasing'), by time-apportionment, or on the whole gain, chosen per disposal. For anything owned since before 2015, rebasing routinely cuts the taxable gain by half or more, and a retrospective RICS valuation at 2015 — entirely obtainable today, around £300 — becomes the most profitable document in the file. Private residence relief still covers years you lived there plus the final nine months; the annual exempt amount (£3,000) applies; residential rates are 18% and 24% depending on where the gain lands against your UK income.

One more mechanical mercy: the 60-day payment is a reasonable estimate, trued up in the year-end return — overpayments come back. And the sale usually appears on your new country's return too, computed under local rules with credit for the UK tax; the 60-day discipline at least guarantees the UK number exists before the foreign deadline needs it.

The penalty schedule (and why speed fixes everything)

Lateness	What it costs
Day 61	£100, flat, immediately
3 months	Potential £10/day, up to £900
6 months	£300 or 5% of the tax, whichever is greater
12 months	The same again — plus interest on unpaid tax throughout

The single fact that matters: penalties stop accruing the day the return goes in. Filing is the tourniquet. Appeals ("my solicitor never mentioned it") sometimes succeed and sometimes don't — but they always go better attached to a completed return, filed at speed, than to an explanation of why nothing has happened since March.

The salvage routine

Day 1–59: send us the completion statement, purchase records and any 2015 valuation evidence. We've filed from a standing start in 72 hours; inside a fortnight is routine.
Day 61–90: file immediately — you're £100 in, and it stays £100 if you move now.
Later: file first, appeal second, and stop the daily clock before arguing about it. Then let the year-end return true up the estimate.

£449, all-in: the three-way computation, the return, the payment set-up, at whatever speed your calendar demands. If your completion is next month, the right time to instruct is now — the sixty days are far more comfortable spent on valuation evidence than on hope.

The documents that make a fast filing possible

Speed inside the 60 days is entirely a document game, so here is the pack that lets us file within a week: the completion statement from your solicitor (price, date, fees); the purchase completion statement or Land Registry entry from when you bought (original cost, stamp duty, purchase legals); receipts or a schedule for capital improvements — the extension counts here even though it never counted against rent; a April 2015 valuation if the property predates it (a retrospective RICS valuation takes about a week to commission — the one genuine lead-time item, which is why instructing at exchange rather than completion buys you the whole margin); and your UK income estimate for the year, which sets how much of the gain sits in the 18% band. Sellers who assemble this pack before completion never meet the penalty regime at all — the sixty days turn out to be fifty-three days of waiting and one afternoon of signing.

Questions readers ask

Does the 60-day rule apply if I make a loss on the sale?

For non-residents, yes — this is the trap inside the trap. UK residents only file a 60-day return when tax is due; non-residents must report every disposal of UK land within 60 days, gains, losses and break-evens alike. A loss return is far from pointless, though: it puts the loss on record where it can offset other UK property gains now or in the future. The penalties for skipping a nil return are the same £100-and-upward ladder as for skipping one with tax due.

My solicitor says they'll 'deal with the tax' — am I covered?

Ask them precisely what they mean, in writing. Conveyancers handle completion mechanics and occasionally hold funds for tax, but very few prepare NRCGT computations, run the rebasing comparison, or file the 60-day return — it sits outside their retainer and their insurance. The gap between 'we'll deal with it' and a filed return is where most of the late-filing penalties we rescue actually come from. The clean division: solicitor completes the sale, accountant files the return, and both know which is which before completion day.

How do I get a 2015 valuation for a property I've owned since 2009?

Commission a retrospective 'red book' valuation from a RICS surveyor — they value the property as at 5 April 2015 using comparable sales evidence from that period, and it is entirely routine work costing a few hundred pounds. Online estimates and index-linked guesses are not robust if HMRC enquires; a signed RICS report is. Since rebasing regularly removes half or more of the taxable gain on long-held property, this is the highest-return document in the whole transaction. Order it at instruction stage, not day 55.

Do I pay the 60-day tax again through Self Assessment?

No — the 60-day payment is a payment on account, and your year-end Self Assessment reconciles it against the final position once your actual income for the year (which sets the 18%/24% split) is known. Overpayments come back through the return; underpayments are settled with the January balance. Non-residents with no other UK filing obligation can sometimes treat the 60-day return as final and skip Self Assessment entirely — one of the rare simplifications in this area, and worth confirming rather than assuming.