As a sole trader, HMRC taxes you on your profit — your turnover minus allowable business expenses. This calculator applies the exact same steps as Self Assessment: Personal Allowance, Income Tax bands, then Class 2 and Class 4 National Insurance on top.
For 2026/27 the Personal Allowance is frozen at £12,570. You pay 20% on profit £12,571–£50,270, 40% on £50,271–£125,140, and 45% above. Income above £100,000 tapers your Personal Allowance — the so-called 60% tax trap. Class 4 NICs are 6% on profits £12,570–£50,270 then 2% above. Class 2 is a flat £3.45/week and counts towards your State Pension.
Being self-employed gives you freedom and flexibility, but it also means managing your own tax affairs. Unlike employed workers who have tax deducted through PAYE, sole traders must calculate their own tax bill and pay HMRC directly through Self Assessment. This calculator helps you estimate exactly how much Income Tax and National Insurance you will owe.
As a sole trader, you pay tax on your profits — not your total turnover. You calculate profits by subtracting all allowable business expenses from your business income. Allowable expenses include office costs, travel, professional subscriptions, insurance, equipment, marketing, and a portion of your home expenses if you work from home.
Once you have your taxable profit, you apply the same Income Tax bands as everyone else: 0% on the first £12,570 (personal allowance), 20% on profits between £12,571 and £50,270, 40% between £50,271 and £125,140, and 45% above that. On top of Income Tax, you pay Class 2 National Insurance (£3.50/week if profits exceed £6,725) and Class 4 NICs (6% on profits between £12,570 and £50,270, then 2% above).
Register for Self Assessment as soon as you start trading — the deadline is 5 October after your first tax year ends. Keep meticulous records of all income and expenses; HMRC can investigate your accounts going back 5 years. Consider using accounting software like FreeAgent or QuickBooks to track everything automatically. And do not forget to claim the £1,000 trading allowance if your expenses are low — sometimes it is more generous than claiming actual costs.
Need help with expenses? Read our guide to allowable expenses that side hustlers often forget or use our free Self Assessment checklist.
The table below shows the Income Tax rates that apply to your total taxable income (profits + any other income) for the tax year running 6 April 2026 to 5 April 2027. The Personal Allowance of £12,570 is frozen until April 2028.
| Band | Taxable Income | Tax Rate | Applies To |
|---|---|---|---|
| Personal Allowance | Up to £12,570 | 0% | Everyone (tapers above £100k) |
| Basic Rate | £12,571 to £50,270 | 20% | Most sole traders |
| Higher Rate | £50,271 to £125,140 | 40% | Higher-earning self-employed |
| Additional Rate | Over £125,140 | 45% | Top earners |
Unlike employees who pay Class 1 NICs through PAYE, sole traders pay Class 2 and Class 4 National Insurance contributions based on their annual profits:
Class 2 contributions build your entitlement to the State Pension and certain benefits, so even though they are a flat weekly rate, they provide valuable cover.
Our sole trader tax calculator follows HMRC's Self Assessment logic step-by-step:
The result is your estimated take-home pay — the money you actually keep after HMRC takes its share. Use this figure to plan your savings, pension contributions, and quarterly Payments on Account.
A sole trader pays Income Tax on profits above the Personal Allowance (£12,570), plus Class 2 and Class 4 National Insurance. The effective tax rate varies: at £30,000 profit it is roughly 18–20%; at £60,000 it rises to roughly 30–32% because you enter the Higher Rate band.
Class 2 is a flat weekly rate (£3.45) paid if your profits are above £6,725. It counts towards benefits. Class 4 is a percentage of your profits (6% or 2%) and does not count towards benefits — it is purely a tax on earnings.
You must register for VAT if your taxable turnover exceeds the VAT threshold (£85,000 for 2026/27). You can also register voluntarily if it benefits your business (e.g., to reclaim VAT on expenses).
Online tax returns for the 2026/27 tax year must be submitted by 31 January 2028. Any tax owed is also due by that date. If your bill is over £1,000, you usually make Payments on Account on 31 January and 31 July.
Yes. Contributions to a personal pension extend your Basic Rate band, meaning you get tax relief at your highest marginal rate. This calculator does not include pension inputs, but you can roughly estimate relief by reducing your taxable profit figure.
All calculations are verified against official HMRC thresholds and rates for the 2026/27 tax year. Figures are updated within 24 hours of any HMRC announcement. Calculations are for guidance only — consult a qualified accountant for personalised advice.
How much tax does a sole trader actually pay? These worked examples show the real numbers at different income levels, assuming no pension contributions.
| Income | Class 2 NIC | Class 4 NIC | Income Tax | Total Tax | Take-Home | Effective Rate |
|---|---|---|---|---|---|---|
| £15,000 | £182 | £146 | £486 | £814 | £14,186 | 5.4% |
| £25,000 | £182 | £738 | £2,486 | £3,406 | £21,594 | 13.6% |
| £35,000 | £182 | £1,330 | £4,486 | £5,998 | £29,002 | 17.1% |
| £50,000 | £182 | £2,230 | £7,432 | £9,844 | £40,156 | 19.7% |
| £65,000 | £182 | £2,516 | £13,432 | £16,130 | £48,870 | 24.8% |
| £85,000 | £182 | £2,916 | £21,432 | £24,530 | £60,470 | 28.9% |
Tip: Many sole traders under-claim expenses. Common missed claims include: £6/week working from home allowance (£312/year), professional subscriptions, accounting software, business insurance, and a percentage of phone/internet costs.
Claiming all legitimate expenses is the easiest way to reduce your tax bill. Here is what you can claim:
Read our complete guide to expenses side hustlers forget
At higher income levels, operating as a limited company can reduce your tax bill significantly. Here is the comparison at three income levels:
| Income | Sole Trader Take-Home | Limited Company Take-Home | Difference |
|---|---|---|---|
| £30,000 | £24,706 | £25,105 | +£399 |
| £50,000 | £40,156 | £41,589 | +£1,433 |
| £75,000 | £55,086 | £57,463 | +£2,377 |
| £100,000 | £69,336 | £72,089 | +£2,753 |
Limited company advantages: lower Corporation Tax (19-25% vs 20-45% Income Tax), ability to time dividend payments, and more flexible tax planning. Disadvantages: more admin, annual accounts, Corporation Tax return, and Companies House filing.
Use our detailed Sole Trader vs Limited Company calculator to see exact numbers for your income level.