2026/27 HMRC RatesFree
Self Employed Tax Calculator UK
Calculate your Income Tax, Class 2 and Class 4 National Insurance as a sole trader or freelancer. Updated with the latest 2026/27 HMRC rates.
Self Employed Tax Calculator
Enter your business income and expenses
Pension contributions reduce your taxable profit
Tax Calculation Results
Based on 2026/27 HMRC rates
Net Profit
£40,000
Total Tax
£NaN
Take Home
£NaN
| Gross Turnover | £50,000 |
| Less: Business Expenses | -£10,000 |
| Net Profit | £40,000 |
| Personal Allowance | £12,570 |
| Taxable Income | £27,430 |
| Income Tax | -£NaN |
| Class 2 National Insurance | -£182 |
| Class 4 National Insurance | -£1,646 |
| Take Home Pay (Annual) | £NaN |
| Take Home Pay (Monthly) | £NaN |
| Effective Tax Rate | NaN% |
2026/27 Tax Rates
Income Tax Bands
- Personal Allowance: £12,570
- Basic Rate (20%): £12,571 - £50,270
- Higher Rate (40%): £50,271 - £125,140
- Additional Rate (45%): Over £125,140
Self-Employed NI
- Class 2: £3.50/week (if profit > £12,570)
- Class 4 (6%): £12,570 - £50,270
- Class 4 (2%): Above £50,270
Self Employed Tax Calculator – Frequently Asked Questions
What expenses can I claim as self-employed?
Common allowable expenses include office costs, travel expenses, clothing (uniforms), staff costs, stock and materials, financial costs, marketing, and professional fees. Expenses must be wholly and exclusively for business purposes.
How is Class 4 National Insurance calculated?
Class 4 NI is calculated on your profits. For 2026/27, you pay 6% on profits between £12,570 and £50,270, and 2% on profits above £50,270. There is no Class 4 NI on profits below £12,570.
When do I pay self assessment tax?
Self Assessment tax returns must be filed by 31 January following the end of the tax year. Payment is also due by 31 January, with a second payment on account due by 31 July if applicable.
Do I need to register for self assessment?
You must register for Self Assessment if your self-employed income exceeds £1,000 in a tax year, or if you need to report other untaxed income such as rental income or capital gains.