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Tax calculator

Estimate your Income Tax and Class 4 National Insurance.

See HMRC's two ways of claiming for your vehicle side by side. Example figures are filled in: change them to yours.

Tax year (6 April to 5 April) Earnings for the year (£) Other allowable costs, not the vehicle (£) for example phone share, licence fees, parking, accountant I pay Scottish Income Tax

Vehicle Business miles in the year Vehicle running costs for the year (£) fuel, insurance, repairs, MOT, vehicle tax Business use of the vehicle (%)

Once you use the flat rate for a vehicle, HMRC requires you to keep using it for as long as you use that vehicle for your business. Going the other way depends on what you have already claimed for the vehicle. Ask your accountant. Rates: .

Making Tax Digital checker

When might Making Tax Digital apply to you?

Enter your qualifying income: your gross income from self-employment and property, before expenses. Leave a year blank if you do not know it.

2024-25 (£)

2025-26 (£)

2026-27 (£)

Enter at least one year.

Thresholds from gov.uk "Find out if and when you need to use Making Tax Digital for Income Tax" (updated 26 March 2026, checked 1 October 2026): qualifying income over £50,000 in 2024-25 means from 6 April 2026; over £30,000 in 2025-26 means from 6 April 2027; over £20,000 in 2026-27 means from 6 April 2028. Exemptions exist: check gov.uk.

Electric car allowance

Bought an electric car for your work? Compare the capital allowance with the flat rate.

If you buy a new, unused, fully electric car, HMRC lets you deduct the business share of its price from your profit in the tax year you buy it. This is the 100% first-year allowance. The tool compares it with the flat mileage rate for the same car. Example figures are filled in: change them to yours.

Tax year you bought the car (6 April to 5 April) Earnings for the year (£) Other allowable costs, not the car (£) I pay Scottish Income Tax

The car Price you paid for the car (£) Business miles in the year Car running costs for the year (£) charging, insurance, repairs, MOT, vehicle tax Business use of the car (%)

Only a car bought new and unused that is electric, or has zero CO2 emissions, gets the 100% allowance. For a sole trader it covers a car bought on or before 5 April 2027. A second-hand electric car gets a smaller yearly allowance instead (18% of its value before April 2026, 14% from April 2026); this tool shows the first year only.

You cannot claim capital allowances on a car you already use the flat mileage rate for. Once you use the flat rate for a car, you must keep using it for as long as you use that car for your business.

Sources (read 9 October 2026): First-year allowances, Business cars, Simplified expenses: vehicles, HMRC Capital Allowances Manual CA23153.

Free record templates

Mileage and expense logs.

CSV

Mileage log template

One row per shift: work miles, home legs, personal miles and odometer readings.

CSV

Expense log template

One row per receipt: merchant, category, amount, VAT and business use. Opens in Excel, Google Sheets or Numbers.

No sign-up. Record templates only: they do not calculate tax. General information, not tax advice.