Freelance Tax Calculator UK 2025/26
Use this freelance tax calculator to estimate how extra client work, consulting, contracting or project income could affect your UK tax bill when you also have PAYE income.
Tax year: 2024/25 | 2025/26 | 2026/27
Last verified against GOV.UK rates: 7 May 2026.
Methodology: this calculator uses the main Income Tax rates for England, Wales and Northern Ireland, the standard Personal Allowance, and self-employed Class 4 National Insurance rates. It does not cover Scottish Income Tax bands, student loans, pension contributions, VAT, benefits, tailored reliefs, or personal tax advice.
Important: Income tax bands are different if you live in Scotland.
Side Hustle Details
Employment Income
Tax Calculation Results
| Main Income: | £ |
| Side Hustle Income: | £ |
| Side Hustle Expenses: | £ |
| Side Hustle Profit: | £ |
| Estimated Additional Income Tax: | ~£ |
| Estimated National Insurance Contributions: | ~£ |
| Estimated Total Additional Tax (Income Tax + NI): | ~£ |
| Estimated Effective Tax Rate (Income Tax + NI): | % |
Based on this gross side hustle income, Making Tax Digital may apply from . Check HMRC guidance because digital records and quarterly updates may be required.
Previous Calculations
| Main Income: | £ |
| Side Hustle Income: | £ |
| Side Hustle Expenses: | £ |
| Side Hustle Profit: | £ |
| Estimated Additional Income Tax: | ~£ |
| Estimated National Insurance Contributions: | ~£ |
| Estimated Total Additional Tax (Income Tax + NI): | ~£ |
| Estimated Effective Tax Rate (Income Tax + NI): | % |
How to use this freelance tax calculator uk
Use this freelance tax calculator to estimate how extra client work, consulting, contracting or project income could affect your UK tax bill when you also have PAYE income.
Enter your gross freelance income, the allowable expenses or trading allowance deduction you want to model, and your annual salary. The calculator runs locally in your browser and does not send your financial inputs to our server or analytics.
Freelance income is normally treated as self-employed trading income when you are working for clients on your own account. If gross trading income is over £1,000 in the tax year, check whether you need to register for Self Assessment.
- Use Side Hustle Income for gross income before expenses or allowances.
- Use Side Hustle Expenses for allowable expenses, or for the deduction you want to model, such as the trading allowance.
- Use Annual Salary for your PAYE salary before tax.
Trading Allowance vs Actual Expenses
The trading allowance can exempt up to £1,000 of gross trading income. If your gross trading income is £1,000 or less, you may not need to tell HMRC, although some circumstances still require a tax return.
If gross trading income is more than £1,000, you can usually choose between deducting the £1,000 trading allowance or deducting actual allowable expenses. You cannot claim both for the same trade.
Official Sources
Freelance Tax Calculator UK examples
Example 1
PAYE designer earning £35,000 salary plus £6,000 of freelance projects and £800 of software, equipment and portfolio costs.
Example 2
Part-time consultant earning £55,000 salary plus £15,000 of freelance profit, where some extra income may fall into higher-rate tax.
Example 3
New freelancer testing a small service under or over the £1,000 trading allowance and deciding whether to model the allowance or actual expenses.
FAQs
Do freelancers need to register for Self Assessment?
You normally need to register if your gross freelance trading income is over £1,000 in a tax year, or if HMRC otherwise asks you to file a tax return.
Is the £1,000 trading allowance based on income or profit?
It is based on gross trading income before expenses. If income is above £1,000, you usually choose between deducting the allowance or your actual allowable expenses.
Can I claim laptop, software or home office expenses?
Freelancers can usually claim allowable business costs where they are wholly and exclusively for the trade, with private-use adjustments where needed.
Do I pay Class 4 National Insurance on freelance income?
Class 4 National Insurance is based on self-employed profit above the annual threshold. The calculator estimates it using the 2025/26 rates for England, Wales and Northern Ireland tax planning.
Does PAYE salary affect freelance tax?
Yes. Your freelance profit is added on top of PAYE income, so a salary near the higher-rate threshold can make extra freelance profit taxable at a higher marginal rate.
When do payments on account apply?
Payments on account can apply when your Self Assessment bill is at least £1,000 and less than 80% of the tax was collected outside Self Assessment, for example through PAYE.
More Side Hustle Tax Calculators
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Important: This calculator provides estimates based on current UK tax rates. For accurate advice specific to your situation, consult a qualified tax professional or HMRC.