UK Side Hustle Tax Calculator
Free UK extra income tax calculator for 2025/26. Estimate Income Tax and Class 4 National Insurance on side hustle and other extra income alongside PAYE salary, expenses, trading allowance and HMRC Self Assessment deadlines.
UK Side Hustle Tax Calculator launched on November 9, 2024 with 5 votes and more than 50% of that year's launches. The site was still online in September 2026, 1 year on.
What it does
Calculate the UK tax on extra income from a side hustle or second income stream. This free extra income tax calculator gives instant estimates of Income Tax and National Insurance on additional earnings alongside your PAYE salary. All calculations run securely in your browser - no sensitive financial information is ever sent to external servers. 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. Understanding your tax…from sidehustletaxcalculator.uk
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