Capital Gains Tax on UK Property: Rates, Reliefs and What Triggers a Charge

Capital Gains Tax is one of the most misunderstood taxes in property. People either assume they do not owe it, or assume their accountant will deal with it at the end of the year. Both assumptions can be expensive. The 60-day reporting window, the rate on the gain, and the question of whether a gain is even CGT at all are all things worth understanding before you commit to a sale.

When CGT applies to property

CGT arises when you dispose of a capital asset — including land and property — for more than you paid for it. “Disposal” includes a sale but also a gift, transfer into a trust, or exchange. The gain is broadly the sale proceeds minus the original cost, plus any improvement costs you have incurred, minus the expenses of acquisition and disposal (legal fees, agents’ commissions).

Not all property gains are CGT. If buying and selling property is your trade — that is, you do it with regularity and commercial intent — the profits are trading income, taxed under income tax rules. More on that distinction below.

The rates: 18% and 24%

Residential property gains are taxed at 18% for basic-rate taxpayers and 24% for higher or additional-rate taxpayers. The rate that applies to a particular pound of gain depends on where your total income plus the gain falls relative to the basic-rate tax band.

In practice, most landlords and investors selling a property with a meaningful gain will pay at 24%, because the gain itself pushes total taxable income above the basic-rate threshold. If part of the gain falls within unused basic-rate band, that slice is charged at 18%.

Commercial property — land and buildings used for non-residential purposes — is taxed at the same rates as other capital assets. Always check which classification applies to a mixed-use property.

The Annual Exempt Amount

Each individual has an Annual Exempt Amount (AEA) that can be set against gains before tax is charged. The exemption has been significantly reduced in recent years and now stands at £3,000 per tax year. For a sole investor with a single disposal, this makes almost no difference on a property gain of any size. It does matter when you are planning a series of smaller disposals or crystallising gains in a year where you have other losses.

Companies do not benefit from the AEA. Corporate property disposals are subject to Corporation Tax on the gain, not CGT — a distinction that matters when comparing individual and company ownership structures.

Private Residence Relief: your main home is (usually) exempt

The most valuable relief in the system is Private Residence Relief (PRR). If a property has been your only or main home throughout the entire period of ownership, the gain is fully exempt from CGT. The final nine months of ownership always qualifies for PRR regardless of whether you were living there — which protects you if you have moved out and are waiting for a sale to complete.

PRR becomes complicated when:

• You have let the property for part of the period (only the proportion of time it was your main home qualifies for full relief)
• You have used part of the property exclusively for business
• You own more than one home and have not made a formal election about which is your main residence
• You developed the property with a view to profit rather than as a home

Where PRR covers only part of the gain, the remainder is still taxable. The calculation involves time apportionment across the full ownership period, and getting it wrong in either direction — overclaiming or underclaiming — is common.

The 60-day reporting and payment deadline

This is the rule that trips people up most often. Since April 2020, any CGT arising on UK residential property must be reported and paid within 60 days of the completion date. This is not a Self Assessment deadline; it is a separate obligation using HMRC’s online CGT service.

The 60-day clock starts on the day contracts complete — not when you receive the proceeds, not when the money clears your account. If you miss the window, HMRC issues an automatic penalty of £100, with further penalties if the delay extends. Interest accrues on the unpaid tax from day 61.

Many sellers assume their accountant is handling this. Many accountants assume they will be told about a sale when it happens. The gap between those two assumptions is where penalties accumulate. Notify your adviser the moment exchange takes place, not after completion.

The CGT payment made within 60 days is a payment on account. If your final liability differs when you file your Self Assessment — because you have other gains, losses or reliefs in the same tax year — the difference is settled via the return. Overpayments are refunded; underpayments attract a further charge.

Developers and investors: the trading vs investment question

HMRC applies a multi-factor test to determine whether a property activity is a trade (taxed as income) or investment (taxed as a capital gain). The relevant factors include the frequency of transactions, the length of ownership, the nature of the work done, the source of finance, and the intention at the point of acquisition.

A developer who buys sites, builds out and sells regularly is almost certainly trading. An investor who buys a flat, lets it for ten years and then sells is almost certainly realising a capital gain. Between those two ends of the spectrum there is considerable grey area — and HMRC actively challenges characterisations it disagrees with.

The tax cost of getting this wrong can be large. Trading income is subject to income tax at up to 45%, plus National Insurance. A capital gain on the same profit would be taxed at 24%. The difference on a £200,000 gain exceeds £40,000. It is worth having the analysis done properly before structuring a disposal, not after.

Planning before the disposal

Once a property is sold, the options narrow sharply. Before disposal there are several levers worth considering: timing the sale across tax years to use available exemptions, transferring a share of the asset to a spouse or civil partner before sale to access two sets of basic-rate band and AEA, ensuring all allowable costs have been captured, and reviewing whether any losses can be crystallised in the same year to offset part of the gain. For properties with complex history — periods of letting, partial business use, prior gifts — a base cost calculation before you commit to a price is always worthwhile.

We work with property investors and developers across Liverpool, Manchester and the wider North West on acquisition and disposal planning as part of a joined-up approach to property tax. CGT rarely sits in isolation from the rest of a portfolio.

Common questions

What is the CGT rate on residential property in the UK?

Residential property gains are taxed at 18% for basic-rate taxpayers and 24% for higher or additional-rate taxpayers. The rate that applies depends on where your total income plus the gain falls relative to the basic-rate tax band. Most sellers of investment property pay at 24%.

Do I pay CGT when I sell my main home?

Usually not. Private Residence Relief (PRR) exempts the gain on a property that has been your only or main home throughout the period of ownership. The final nine months always qualifies. If you have let the property or had periods away, PRR may cover only part of the gain.

How long do I have to report and pay CGT on a property sale?

You must report and pay any CGT due on UK residential property within 60 days of completion. This is separate from your Self Assessment return. Missing the window triggers automatic penalties and interest from HMRC, regardless of when your annual return is filed.

Is a property developer’s profit subject to CGT or income tax?

It depends on whether the activity is a trade or an investment. Frequent buying, developing and selling with a view to profit is usually trading income — taxed under income tax rules at higher rates. Long-term investment followed by disposal is more likely to be a capital gain. The distinction is fact-specific and HMRC scrutinises it closely.

This article is general information, not personal tax advice, and tax rules change. Your own position depends on facts we cannot see from here — please take advice before acting on anything above.

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