Capital Gains Tax on property: when a sale triggers it

Capital Gains Tax on property is charged on the profit you make when you sell a property that is not your only or main home. If you have lived in a home as your main residence for the whole time you owned it, Private Residence Relief usually takes the gain out of the tax. Most sales by owner-occupiers therefore trigger no Capital Gains Tax at all, while second homes, buy-to-let flats and mixed-use buildings usually do.

When selling a home triggers Capital Gains Tax

A property sale triggers Capital Gains Tax when Private Residence Relief does not cover the whole gain. In practice that means the property was never your main home, or it was your main home for only part of the time you owned it.

The common cases are a second home, a buy-to-let flat, a holiday let, and a former home you kept and rented out after moving somewhere else. A building used partly for business, such as a shop with a flat above it, can also fall partly outside the relief. The same applies to a home with grounds larger than the area the relief allows. Where a property was bought mainly to renovate and sell on, the tax treatment can follow trading rules rather than investment rules, which are different again.

Ownership matters too. If you owned the property jointly with someone else, each owner has a separate gain and a separate tax position. If it was held through a company, or through a trust, the rules change. If any of that applies to you, get advice before you exchange contracts rather than after.

How Private Residence Relief covers your main home

Private Residence Relief is the reason most people who sell the home they live in pay no Capital Gains Tax. Where a property has been your only or main residence for the whole period of ownership, the relief covers the whole gain, whatever the sale price turns out to be.

The relief looks at use, not at headline prices. Periods when you were not living there, periods when the property was let, and any part used exclusively for business all reduce the share of the gain the relief covers. A final stretch of ownership is usually treated as covered even if you had already moved out, and HM Revenue and Customs publishes the current length of that period in its guidance on tax when you sell your home. If you own more than one home, only one of them can be your main residence for this relief.

If you are trying to work out what your home is worth before deciding anything, a house value check is a sensible starting point. It is a view of price, not a calculation of tax.

Working out the gain: proceeds, costs and allowances

The gain is the sale proceeds minus what you paid for the property, minus certain costs of buying, improving and selling it. Only the gain is taxed, never the whole sale price.

Costs that normally count include the price you originally paid, the property transaction tax paid at the time of purchase, which is Stamp Duty Land Tax in England and Land Transaction Tax in Wales, legal fees, survey fees, and capital improvements such as an extension or a new roof. Everyday repairs and maintenance do not count. Estate agency fees and legal costs on the sale are normally deductible as well. Keep the paperwork: the older the purchase, the more likely you are to be relying on old documents or on a valuation agreed with HMRC.

Each person has an annual exempt amount, which is set for every tax year, and the rates that apply depend on your income tax band. HMRC publishes the current allowances and rates.

Reporting and paying: the 60-day rule for residential property

When Capital Gains Tax is due on a UK residential property, it must normally be reported and paid within 60 days of completion. That deadline is separate from the Self Assessment return, and interest and penalties can follow a late return.

The clock starts at completion, not at exchange, and it applies whether or not you normally file a tax return. A return may also be needed in some cases where no tax is due, for example where the proceeds are above the reporting threshold but relief leaves nothing to pay. If you are unsure whether your sale gives rise to a charge, take advice before completion so the return can be prepared in time.

Why a strong sold price does not mean a big tax bill

A high sale price is not the same thing as a large taxable gain, and mixing up the two is the most common mistake people make when they read price data. The tax is charged on the profit, so a property bought in a softer market years ago and sold into a stronger one today can produce a modest gain even when the headline price looks impressive.

That matters when you are reading public price evidence. Pages showing sold house prices tell you what similar homes in a street actually achieved, which helps when you are judging whether an offer is reasonable. They say nothing about your own base cost, and the base cost is usually what decides whether any tax is due.

The same logic applies to area averages. Local house prices figures are useful for spotting a trend across several years rather than a single month, and a strong area is a valuation signal, not a tax calculation. This site reports recorded sales and does not estimate a tax liability, so treat any figure here as evidence about price and nothing more. Our methodology page explains the data and its limits.

Frequently asked questions

Do I pay Capital Gains Tax when I sell my main home?

In most cases you do not, because Private Residence Relief covers the gain on a home you have lived in as your main residence for the whole period you owned it. You may owe tax if the property was not your main home for part of that period, or if part of it was used for business.

When do I have to report and pay Capital Gains Tax after selling?

Capital Gains Tax on a UK residential property is normally reported and paid within 60 days of completion. That deadline runs separately from Self Assessment, and it applies even if you do not usually complete a tax return.

Does letting out my home affect Private Residence Relief?

Yes, letting can reduce the relief, because the relief is based on the periods and the parts of the property you used as your main home. The position depends on when the letting took place and how the property was used, so the details are worth checking before you sell.