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Tax & Company

Capital Gains Tax Calculator

Property, shares, crypto and business disposals

£20

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Capital Gains Tax Calculator

Overview

When you sell or give away something that has gone up in value – a buy-to-let, a former home, shares, crypto or a business – you may owe capital gains tax (CGT) on the profit. Working it out by hand means juggling purchase and selling costs, improvements, private residence relief, losses, the annual exempt amount, two different rates that depend on your income, and a 60-day deadline for UK residential property. This calculator does all of that for every disposal in the tax year, shows each step of the computation, tells you how much is still to pay and by when, and shows how much could have been saved by sharing ownership with a spouse or civil partner.

Price
£20
Who it’s for
Tax & Company
Works with
Microsoft Excel for Windows and Mac
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See how it works

A walk through the main sheets

The sheets you will use most, in the order you will use them – shown with the sample data every workbook comes with.

Step 1

Disposals

The list of every sale or gift in the year, with the gain, private residence relief, rate group and 60-day status for each. Columns T to V on the right feed the chart. What you do: enter the yellow columns A to J, one row per disposal.

Disposals
Computation

Step 2

Computation

The full CGT computation, step by step, for the tax year chosen. What you do: nothing to enter – read and print it.

Step 3

Spouse Planning

What the tax would have been if part of the asset had been owned by your spouse or civil partner. What you do: enter your spouse's income and the share transferred.

Spouse Planning

Step 4

Who it is for

Made for people like you

  • Example – text
  • Landlords selling a rental property – The gain after costs and improvements, the 60-day report-and-pay deadline and the tax at 18% / 24%.
  • Homeowners selling a former home – Private residence relief for the months you lived there plus the final 9 months, worked out automatically.
  • Investors in shares, funds and crypto – Gains and losses netted off in the most tax-efficient order, with losses carried forward.
  • Business owners and investors selling up – Business Asset Disposal Relief and Investors' Relief at the reduced rate, each within its own £1m lifetime limit.
  • Married couples and civil partners – The saving from transferring part of an asset to a spouse before it's sold.

Quick start

Up and running in minutes

  1. Example – text
  1. Summary – your details – On the Summary sheet, type your name, choose the tax year, and enter your income for the year, any gross pension contributions or Gift Aid, losses brought forward, any BADR or Investors' Relief already used and any CGT already paid on 60-day property returns.
  2. Disposals – one row per sale or gift – Enter a description, choose the asset type, the dates bought and sold, the sale proceeds and the costs. For a former main home, enter the months you lived there.
  3. Check the Status column – Any residential property with a gain shows its 60-day reporting deadline. Red means the deadline has already passed – speak to your accountant or tax adviser straight away.
  4. Read the answer – Back on the Summary, see the total gains, taxable gains, the capital gains tax, the effective rate and how much is still due by 31 January.
  5. Follow the workings – The Computation sheet shows every step – losses, the exempt amount, the basic rate band and the tax at each rate – so you can see exactly where the figure comes from.
  6. Try Spouse Planning – Enter your spouse's or civil partner's income and the share that could be transferred, and see the saving.

Key features

  • Up to 20 disposals with costs, improvements and private residence relief (including the final 9 months).
  • 2026/27 rates: 18%/24%, Business Asset Disposal and Investors' Relief at 18%, the £3,000 exempt amount and loss rules.
  • Optimal ordering of losses and the exempt amount, basic rate band use and the 60-day property reporting deadlines.
  • Spouse planning: the saving from sharing ownership before a sale.

What’s included

  • Summary – Inputs, the answer and chart
  • Disposals – Every sale or gift
  • Computation – Full CGT computation
  • Spouse Planning – Sharing gains with a spouse
  • Tax Rates – Rates and allowances
  • Guide – How to use this workbook

How buying works

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