Calculate the Capital Gains Tax on a UK property sale, including Principal Private Residence relief.
Enter purchase and sale prices
Use the actual prices paid and received, including any adjustments for part-exchange.
Add allowable costs
Include purchase costs (SDLT, legal fees, survey), sale costs (estate agent, legal fees), and genuine improvement costs (extensions, conversions — not repairs).
Enter main residence details if applicable
If the property was ever your main home, enter the months you lived there versus total months owned. The last 9 months of ownership are always exempt.
Review your CGT liability
See your gain, applicable reliefs, taxable amount, CGT due, and whether you need to report within 60 days.
What happens after you submit your Self Assessment return — refunds, balancing payments, amendments, HMRC enquiries, the SA302 for mortgages, and the 5-year record-keeping rule
Making Tax Digital for Income Tax (MTD ITSA) starts April 2026 for £50k+ self-employed and landlords. Here's what it means, when it applies to you, the software requirements and how it changes Self Assessment forever.
How HMRC's payments-on-account system works, why your first January bill is bigger than expected, when to reduce them, and the trap of treating January and July as separate
Disclaimer: All results are estimates for guidance only and do not constitute financial, tax or legal advice. Always consult a qualified professional.