Chapter 10: Selling Property: Capital Gains Tax and the 60-Day Rule
Key point: Many landlords sell a property after years of ownership and focus primarily on the gain that has been realised. However, HMRC may require Capital Gains Tax to be reported and paid far sooner than many expect. In the UK, the disposal of an investment property will often trigger a 60-day reporting and payment obligation.
Among property owners, two questions arise with particular frequency:
- "If I sell my own home for a big profit, do I pay tax on that?"
- "If I sell a rental property now, can I deal with the tax next January when the normal tax return is due?"
The first may have a highly favourable answer. The second may create serious difficulty if it is left too late.
Section 1: PRR and the Boundary Between Exempt and Taxable Gains
There is, first, an important point in the taxpayer's favour. If the property you sell has genuinely been your main home, then Private Residence Relief (PRR) can often mean no CGT at all. That is one of the most generous protections in the UK tax system.
But the protection is narrow. If the property is a buy-to-let, a second home, or a property that stopped being your main residence and was then rented out, the gain linked to its investment use may become taxable.
That is where Capital Gains Tax (CGT) enters the picture.
Section 2: The 60-Day Rule
Many people assume that gains on residential property can be dealt with in the ordinary Self Assessment cycle. That assumption is unsafe.
For UK residential property gains, HMRC introduced a strict 60-day reporting and payment rule. From the completion date of the sale, you may have only 60 days to:
- create and access the relevant HMRC property CGT account
- calculate and file the gain
- pay the tax due
If you miss the deadline, penalties and interest may arise quickly. HMRC's position is straightforward: once the sale proceeds have been received, the related tax should be settled without delay.
Section 3: How the Tax Rate on the Gain Is Determined
A common misunderstanding is that a taxpayer who falls within the basic-rate band for ordinary income must necessarily pay property CGT at the lower rate throughout.
That is not necessarily so. For rate purposes, HMRC effectively stacks the taxable gain on top of other income.
Suppose:
- salary: £30,000
- property bought for £200,000
- property sold for £300,000
- gross gain: £100,000
After the annual CGT exemption, perhaps only £97,000 remains taxable. Then HMRC looks at how much of the basic-rate band remains after salary. If only £20,270 of basic-rate room remains, then only that portion of the gain gets the lower property CGT rate. The rest is pushed into the higher property CGT rate.
That is how an ordinary taxpayer selling a single investment property may unexpectedly face a tax bill in excess of £20,000, while still being required to produce the cash within 60 days.
Section 4: What You Should Do Before Selling
Tax planning for a property sale should therefore take place before exchange or completion, rather than after the proceeds have been received.
Important defensive steps include:
- Increase deductible base cost properly Capital improvements that could not reduce rental income tax may still increase the property's base cost for CGT.
- Do not forget transaction costs Purchase SDLT, legal fees, selling-agent fees, and selling legal fees may all matter.
- Consider spouse planning in advance If a lower-income spouse can legally hold part of the gain before sale, you may gain an additional exemption and lower-rate band capacity.
Conclusion
The sale of a property is not merely a commercial conclusion; it is also a time-sensitive tax event. If an adviser has not addressed the 60-day CGT process before completion, the taxpayer is being left materially exposed.