No minimum stay, but the home must have been real
The single most misunderstood point in Private Residence Relief is that there is no qualifying period. Residence takes its ordinary meaning, the dwelling in which you habitually live, and HMRC's Capital Gains Manual accepts that short but genuine occupation counts while stressing it is always a question of fact and degree. Six weeks of real home life can qualify; two years of token occupation while your life continued elsewhere may not. A short stay cut off by a genuine change of circumstances, a relationship ending or a job relocation, can still be residence. What decides an enquiry is evidence: bills, electoral roll, post, furniture, family, and above all whether you moved in intending to stay rather than to sell or let. Brief-occupation claims are exactly where HMRC enquiries concentrate, so keep the paperwork. Our Private Residence Relief guide works through the occupation test, the deemed occupation rules and the absence rules in full.
What the numbers look like on a brief stay
The computation is a fraction: qualifying months over total months of ownership. Take a £200,000 gain on a house owned for 192 months, genuinely occupied for the first 20 and then let until sale: 20 months plus the final 9 qualify, so £30,208 of the gain is exempt and the rest is taxable, roughly £40,000 of CGT for a higher rate taxpayer at 24%. Without those 20 months, and the final period exemption they unlock, the whole gain would have been chargeable, so a short period of genuine occupation is worth real money. Lettings relief contributes nothing in that example because the whole house was let after moving out; since 6 April 2020 it only applies where part of the property was let while another part remained your main residence. Certain absences can also be treated as occupation, including up to 3 years for any reason and periods employed wholly outside the UK, but they generally need the house to be your home again after the absence.
Two complications: the letting history, and selling from abroad
If the letting years were never declared for income tax, the CGT computation will surface them, because HMRC sees the letting history inside the relief claim. Sorting the income tax side first through the Let Property Campaign is almost always cheaper than waiting for HMRC to connect the two. And if you are selling as a non-resident, two extra rules apply: a tax year of non-residence only counts as occupation if you, or your spouse or civil partner, spent at least 90 days in the UK home that year, and the disposal must be reported within 60 days of completion even if no tax is due, with gains generally rebased to 5 April 2015. PRR is a computation where the sequencing of dates decides the bill, so it pays to plan before completion rather than after. Horizon prepares PRR computations and timing advice on fixed fees agreed upfront, with personal returns from £350 and non-resident work from £550; book a free 30-minute clarity call before you sell.