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Capital Gains Tax Calculator (Buy-to-Let, UK, 2026)

Estimate Capital Gains Tax on the sale of a UK buy-to-let. Applies 2024-25 onwards rates (18% basic, 24% higher), £3,000 annual exempt amount, joint-ownership doubling and allowable costs (SDLT, legal, capital improvements).

Disposal details

Sale price

Original purchase price

Purchase costs (SDLT, legal, survey)

Sale costs (legal, agent)

Capital improvements (new kitchen, extension)

Your tax band (after adding the gain)

Jointly owned (with spouse / civil partner)

Doubles the annual exempt amount (£3,000 × 2 = £6,000).

Estimated CGT bill

Gross gain

£122,900

Annual exempt amount

£3,000

Taxable gain

£119,900

CGT at 24%

£28,776

60-day rule: you must report and pay this CGT within 60 days of completion via HMRC's online Capital Gains Tax on UK property account. Missing the deadline triggers £100+ penalties plus interest.

Estimate assumes the entire taxable gain falls in a single band. For part-basic / part-higher gains, use HMRC's official calculator or consult an accountant. Private Residence Relief (if you lived in the property) is not applied here.

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