Updated for 2026/27
Capital Gains Tax Calculator for Property
Work out the Capital Gains Tax due when you sell a residential property, including Private Residence Relief, allowable costs, your annual exempt amount, and the rate split between 18% and 24%.
⚠ 60-day reporting reminder: if there is CGT to pay on a UK residential property, you must report and pay it to HMRC within 60 days of completion using HMRC's "Report and pay Capital Gains Tax on UK property" service, separate from, and earlier than, your Self Assessment return. Missing this deadline can mean automatic penalties and interest.
Your gain, step by step
- Gross gain (sale price minus purchase price)
- £100,000
- Less allowable costs
- − £7,000
- Gain after costs
- £93,000
- Less annual exempt amount (£3,000)
- − £3,000
- Taxable gain
- £90,000
Net Capital Gains Tax due
£20,984
- Taxed at 18% (basic rate)
- £1,849
- Taxed at 24% (higher rate)
- £19,135
Rates and thresholds verified against HMRC guidance as of June 2026. These figures are for general guidance only. Consider speaking to a qualified tax adviser before making financial decisions based on these results.
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Frequently asked questions
Start with your sale price and deduct your original purchase price, the costs of buying (such as legal fees and the SDLT you paid), the costs of selling (estate agent and legal fees) and the cost of any genuine capital improvements you made (not routine repairs or maintenance, which are usually deducted against rental income instead). What is left is your total gain before any reliefs or allowances.