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How to Calculate Capital Gains Tax: Step-by-Step Guide

Calculate CGT manually

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1

Determine the Gain

First, calculate the gain made from the sale of the asset by subtracting the original purchase price from the sale price. For example, if you sell a property for £250,000 and purchased it for £150,000, the gain would be £100,000.

2

Apply the Annual Exempt Amount

Next, subtract the Annual Exempt Amount from the gain to determine the taxable gain. For the 2022-2023 tax year, the Annual Exempt Amount is £12,000.

3

Determine the Tax Rate

Then, determine the income tax rate of the individual. For basic rate taxpayers, the tax rate is 18% (10% for gains from investments, 28% for gains from residential property), while higher rate taxpayers pay 28%.

4

Calculate the Capital Gains Tax

Finally, multiply the taxable gain by the tax rate to calculate the CGT owed. Using the worked example above, the CGT would be £88,000 x 18% = £15,840.

5

Consider Using a Calculator for Convenience

While calculating CGT manually can be useful for understanding the formula, using a calculator can provide an instant result with a breakdown and payment schedule. This can be especially helpful for complex calculations or when dealing with multiple assets.

6

Avoid Common Mistakes

Common mistakes to avoid when calculating CGT include forgetting to apply the Annual Exempt Amount, using the wrong tax rate, or failing to account for other gains or losses. Double-check your calculations to ensure accuracy and avoid potential penalties.

Introduction to Capital Gains Tax Calculator

The Capital Gains Tax (CGT) calculator is a useful tool for calculating the tax owed on gains from the sale of properties and investments in the UK. However, it's essential to understand the underlying formula and how to perform the calculation manually. This guide will walk you through the steps to calculate CGT by hand, including a worked example and common pitfalls to avoid.

Understanding the Formula

The CGT formula is: CGT = (Gain - Annual Exempt Amount) x Tax Rate Where:

  • Gain is the profit made from the sale of the asset
  • Annual Exempt Amount is the tax-free allowance (£12,000 for the 2022-2023 tax year)
  • Tax Rate is the income tax rate of the individual (10% or 20% for basic rate taxpayers, 20% or 28% for higher rate taxpayers)

Worked Example

Let's say John sells a property for £250,000, which he purchased for £150,000. His annual income is £50,000, making him a basic rate taxpayer.

  • Gain = £250,000 - £150,000 = £100,000
  • Annual Exempt Amount = £12,000
  • Taxable Gain = £100,000 - £12,000 = £88,000
  • Tax Rate = 18% (for basic rate taxpayers)
  • CGT = £88,000 x 18% = £15,840

Steps to Calculate Capital Gains Tax

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