Self Employed Tax Calculator 2026
Instantly calculate your self-employed tax bill, National Insurance contributions, and estimated take-home pay. A free UK tax tool for freelancers, sole traders, and contractors for the 2026/27 tax year.
Tax & Profit Projection
Enter your business income and expenses to calculate your tax liability
Your total business income before any expenses are deducted.
Total deductible business expenses (office costs, travel, equipment, etc.).
Income from employment, pensions, savings interest, or rental properties.
Annual pension contributions that qualify for tax relief.
Your Tax Estimate
Income tax, National Insurance, and take-home breakdown
Enter your business details above and click Calculate Tax to reveal your self-employed tax projection.
Self Employed Tax Benchmarks 2026/27
Quickly reference the key tax bands, rates, and thresholds for self-employed individuals in the UK for the 2026/27 tax year.
| Category | Rate / Threshold | Details |
|---|---|---|
| Personal Allowance | £12,570 | Tax-free amount before Income Tax applies |
| Basic Rate (Income Tax) | 20% | On profits between £12,571 and £50,270 |
| Higher Rate (Income Tax) | 40% | On profits between £50,271 and £125,140 |
| Additional Rate (Income Tax) | 45% | On profits over £125,140 |
| Class 4 NIC (Main Rate) | 6% | On profits between £12,570 and £50,270 |
| Class 4 NIC (Upper Rate) | 2% | On profits above £50,270 |
| Trading Allowance | £1,000 | Tax-free allowance for casual/self-employed income |
| Self Assessment Deadline | 31 January | Payment deadline for previous tax year |
Self Employed Tax FAQ
Everything you need to know about calculating self-employed tax, understanding your obligations, and navigating the UK Self Assessment system in 2026.
As a self-employed individual in the UK, you pay Income Tax on your profits based on the same bands as employed workers: 0% on profits up to £12,570 (Personal Allowance), 20% basic rate on £12,571 to £50,270, 40% higher rate on £50,271 to £125,140, and 45% additional rate on profits over £125,140. You also pay Class 4 National Insurance at 6% on profits between £12,570 and £50,270, and 2% on profits above £50,270.
Self-employed tax is paid through the Self Assessment system. The tax year runs from 6 April to 5 April the following year. You must file your online tax return by 31 December following the end of the tax year, and pay any tax owed by 31 January. For example, for the 2025/26 tax year (ending 5 April 2026), you file by 31 December 2026 and pay by 31 January 2027. Payments on account may also be required if your tax bill exceeds £1,000.
You can claim ‘wholly and exclusively’ business expenses including: office costs (stationery, phone bills, internet), travel costs (fuel, parking, train tickets), clothing expenses (uniforms, protective gear), staff costs (salaries, subcontractor fees), things you buy to sell on, financial costs (insurance, bank charges), business premises costs (heating, lighting, rent), and advertising/marketing. You can also use simplified expenses (flat rates) for working from home and vehicle costs.
Yes, if you’re self-employed and earned more than £1,000 in a tax year, you must register for Self Assessment with HMRC. You should register by 5 October following the end of the tax year you started trading. For example, if you started in June 2025 (2025/26 tax year), register by 5 October 2026. You can register online through the HMRC website, and you’ll receive a Unique Taxpayer Reference (UTR) number to file your returns.
The trading allowance is a tax exemption of £1,000 per tax year for self-employed income or casual services. If your annual self-employed income is £1,000 or less, you don’t need to declare it or pay tax on it. If your income exceeds £1,000, you can choose to deduct either the £1,000 allowance or your actual expenses (whichever is more beneficial). However, the trading allowance doesn’t apply if you’re already claiming expenses through your business.
Class 4 National Insurance is the main NI contribution for self-employed people, paid as a percentage of profits: 6% on profits between £12,570 and £50,270, and 2% on profits above £50,270. Class 2 NIC was effectively abolished from April 2025 for most self-employed people, but those with profits below the Small Profits Threshold can still make voluntary Class 2 contributions (£3.45 per week) to protect their State Pension entitlement and access to certain benefits.
To calculate take-home pay as self-employed: start with your total business turnover, subtract all allowable business expenses to get your profit, then deduct Income Tax and Class 4 National Insurance. Your take-home pay is what remains after these deductions. Remember that unlike employed workers, you’re responsible for calculating and paying your own tax, and you don’t get employer NI contributions or pension contributions unless you arrange them yourself.