Are you selling your buy-to-let property or second home?
The Small Business ServiceUpdated 2 min read

The rules have changed over recent years, so here is what you need to know.
Capital Gains Tax on UK residential property now has one big practical rule: if you owe tax when you sell, you normally have to tell HMRC and pay it within 60 days of completion. That is a big change from the old system, where you could often wait until your next tax return.
When these rules apply
- They apply if you sell a UK home that is not fully covered by main residence relief, such as:
- A buy-to-let or rental property
- A second home or holiday home
- A former main home where you only get partial relief (for example because you let it out for a while)
- If your only or main home is fully covered by main residence relief and there is no tax to pay, you usually do not need to make this special 60-day property report.
- Non-UK residents generally have to report UK property sales even if there is no tax to pay, so their obligations are wider.
The 60-day deadline
- For completions on or after 27 October 2021, you must:
- Report the sale online, and
- Pay the Capital Gains Tax within 60 days of the completion date.
- Completion is the day the sale formally finishes and you get the money, not the day you exchange contracts.
- For completions between 6 April 2020 and 26 October 2021, the deadline was 30 days.
- Before April 2020 there was no fast reporting rule; you just included the gain on your normal tax return later.
What you have to do
- Work out your gain, starting with:
- The sale price
- Minus what you paid for the property
- Minus buying and selling costs (legal fees, estate agent, stamp duty, some improvement costs)
- Minus any reliefs (like main residence relief for the time you lived there)
- Use HMRC’s online service for Capital Gains Tax on UK property to:
- Create a property account
- Submit details of the sale and the gain
- Pay the estimated tax due
- If you sell more than one property in the year, you may need to make more than one report.
Contact The Small Business Service: we can help collate your costs to make sure you claim all allowable expenses, and provide the calculations for your return.
The link with your normal tax return
- The information from your UK property Capital Gains Tax return also needs to be declared on your SA100 Self Assessment tax return.
- When you complete your SA100, you can update the figures if your income or allowances turn out different from what you estimated for the 60-day payment, and any extra tax or refund is sorted out then.
- If you do not normally complete a tax return and your only issue is one taxable property sale that you have fully dealt with under the 60-day rules, you may not need to go into Self Assessment at all.
Why this matters if you sell
You no longer have months or a year to think about Capital Gains Tax after selling a rental property or second home: you must act within 60 days of completion.
Get in touch if you need advice on completing your UK property Capital Gains Tax return.


