All calculators
Mortgages & Money2 min check
Capital Gains Tax Calculator
Step 1 of 20%
How it works
Gain = sale price − purchase price − allowable costs (legal fees, improvements, stamp duty paid). Subtract the £3,000 annual exempt amount, then tax the remainder at 18% or 24% depending on whether it falls into your basic-rate or higher-rate income band.
Worked example
BTL sold for £280k, bought for £200k, £8k costs → £72k gain. Less £3k allowance = £69k taxable. Higher-rate taxpayer: 24% × £69,000 = £16,560 CGT due.
Who should use this
- •Buy-to-let landlords selling a property
- •Investors selling shares outside an ISA
- •Anyone selling a second home or holiday let
Common mistakes
- ×Forgetting the annual allowance dropped from £12,300 to £3,000
- ×Missing the 60-day reporting deadline for residential property gains
- ×Forgetting to deduct purchase costs and improvements
- ×Using old 28% / 18% residential rates (changed Oct 2024)
Frequently asked questions
When do I pay CGT on a property?▾
Within 60 days of completion via a CGT on UK Property account. Other assets are reported via Self Assessment.
Do I pay CGT on my main home?▾
Usually no — Private Residence Relief covers your main home, though periods of letting or absence can reduce relief.
Are ISAs CGT-free?▾
Yes — gains inside Stocks & Shares ISAs are completely free of CGT.