This calculator provides a planning estimate only and is not tax, legal, or financial advice. CGT rates used are 18% (basic rate) and 24% (higher/additional rate) for residential property disposals in 2025/26. The annual exempt amount is £3,000. Private Residence Relief calculations use the current 9-month final period (reduced from 18 months in April 2020). This calculator does not handle all reliefs, losses carried forward, non-UK residents, trusts, or complex part-disposal situations. Always confirm your position with a qualified accountant and report via HMRC's online service within 60 days of completion.