Self-Employed Tax Calculator UK 2026/27
Calculate your freelancer, sole trader, or contractor take home pay. Enter your turnover and expenses to see exactly how much you keep after income tax, Class 2 & Class 4 National Insurance, pension, and student loan repayments.
How Self-Employed Tax Works in the UK
If you're a sole trader or freelancer, you pay tax on your profits — that's your total revenue (turnover) minus allowable business expenses. You're responsible for paying both income tax and National Insurance through Self Assessment, filing a tax return each year.
Unlike employees who have tax deducted at source through PAYE, self-employed workers pay Class 2 and Class 4 National Insurance instead of Class 1. You may also need to make payments on account — advance payments towards next year's tax bill, each equal to half of your previous year's liability.
Class 2 & Class 4 National Insurance 2026/27
| Type | Threshold | Rate |
|---|---|---|
| Class 2 NI | Profits above £12,570 | £3.45/week (£179.40/year) |
| Class 4 NI (lower) | £12,570 – £50,270 | 6% |
| Class 4 NI (upper) | Above £50,270 | 2% |
Class 2 NI is a flat-rate contribution that builds your entitlement to the State Pension and certain benefits. Class 4 NI is a profit-based contribution and does not count towards any benefits — it is purely a tax on your earnings.
Self-Employed Tax Example: £50,000 Turnover
Here is a complete worked example showing how tax is calculated on £50,000 annual turnover with £5,000 in allowable business expenses.
| Step | Calculation | Amount |
|---|---|---|
| Gross turnover | Total revenue | £50,000 |
| Allowable expenses | Office, travel, subscriptions, etc. | −£5,000 |
| Taxable profit | £50,000 − £5,000 | £45,000 |
| Personal allowance | Tax-free amount | −£12,570 |
| Income tax (20%) | (£45,000 − £12,570) × 20% | £6,486 |
| Class 2 NI | £3.45 × 52 weeks | £179 |
| Class 4 NI (6%) | (£45,000 − £12,570) × 6% | £1,946 |
| Total tax & NI | £6,486 + £179 + £1,946 | £8,611 |
| Take home pay | £45,000 − £8,611 | £36,389 |
That works out to roughly £3,032 per month or £700 per week. Your effective tax rate on profit is 19.1%, meaning you keep about 81p of every pound you earn after expenses.
Self-Employed vs Employed: Full Tax Comparison
Many people wonder whether it's cheaper to be self-employed or employed. Here is a side-by-side comparison at the same £45,000 income level for 2026/27. Use our employed take home pay calculator to compare your own figures.
| Item | Employed (£45,000) | Self-Employed (£45,000 profit) |
|---|---|---|
| Income tax | £6,486 | £6,486 |
| National Insurance | £2,594 (8% employee NI) | £2,125 (Class 2 + Class 4) |
| Total tax & NI | £9,080 | £8,611 |
| Take home pay | £35,920 | £36,389 |
| NI saving | — | £469 less NI per year |
| Employer pension (auto-enrolment) | ~£1,350/year (3% of qualifying earnings) | None — must arrange your own |
| Statutory sick pay | Up to £116.75/week | None |
| Paid holiday | 5.6 weeks minimum | None — unpaid time off |
| Employer's NI (hidden cost) | Employer pays ~£4,481 | Not applicable |
While self-employed workers save around £469 per year on NI at this income level, employed workers receive employer pension contributions worth approximately £1,350, plus statutory sick pay and paid holiday. Contractors should also check our IR35 calculator to understand the tax implications of working through a limited company.
Key Self-Assessment Deadlines 2026/27
Missing a Self Assessment deadline can result in penalties starting at £100 and increasing over time. Here are the key dates for the 2026/27 tax year.
| Deadline | What's Due | Penalty for Missing |
|---|---|---|
| 5 October 2026 | Register for Self Assessment (if newly self-employed) | May face penalties and interest |
| 31 October 2026 | Submit paper tax return | £100 immediate fine |
| 31 January 2027 | Submit online tax return & pay tax owed | £100 fine + interest on late payment |
| 31 January 2027 | First payment on account for 2026/27 | Interest charged on late amount |
| 31 July 2027 | Second payment on account for 2026/27 | Interest charged on late amount |
If your tax bill is under £1,000, or if more than 80% of your tax is collected at source (e.g., through PAYE from another job), you won't need to make payments on account.
What Expenses Can I Claim as Self-Employed?
You can deduct legitimate business costs from your turnover before calculating tax. Claiming all your allowable expenses is one of the most effective ways to reduce your self-employed tax bill. Common categories include:
| Expense Category | Examples |
|---|---|
| Office costs | Stationery, printer ink, postage, computer software |
| Travel | Fuel, public transport, parking, business mileage (45p/mile for first 10,000 miles) |
| Professional services | Accountant fees, solicitor fees, professional body subscriptions |
| Communication | Phone bills, broadband, business mobile contract |
| Equipment & tools | Computers, machinery, specialist tools (capital allowances may apply) |
| Stock & materials | Raw materials, goods for resale, packaging |
| Premises | Rent, business rates, utilities, insurance for business property |
| Working from home | Proportion of home bills, or simplified flat rate (£6/week without receipts) |
| Marketing | Website hosting, advertising, business cards, networking events |
You cannot claim for anything that has a personal and business use unless you can clearly separate the business portion. Keep receipts and records for at least 5 years after the 31 January submission deadline.
How to Reduce Your Self-Employed Tax Bill
Beyond claiming expenses, there are several legitimate strategies to minimise your tax liability as a sole trader or freelancer.
Pension contributions: Money paid into a personal pension reduces your taxable profit. A £5,000 pension contribution at the basic rate saves you £1,000 in income tax plus £300 in Class 4 NI. The pension provider also claims back 20% tax relief automatically, so a £4,000 net contribution becomes £5,000 in your pension pot.
Trading allowance: If your self-employed income is under £1,000 per year, you don't need to register with HMRC or pay any tax on it. This is useful for occasional freelance work or side projects alongside employment.
Correct accounting method: You can choose between cash basis accounting (record income when received, expenses when paid) or traditional accrual accounting. Cash basis is simpler and can defer tax if you have invoices outstanding at year end. Most sole traders with turnover under £150,000 can use cash basis.
Capital allowances: If you buy equipment, vehicles, or machinery for your business, you can claim Annual Investment Allowance (AIA) of up to £1,000,000, deducting the full cost from your profits in the year of purchase.
Running a limited company instead? See our self-employed vs limited company guide or use the dividend tax calculator to compare your options.
Self-Employed Tax Rates at a Glance
This table shows the total income tax and National Insurance you would pay at different profit levels in 2026/27, assuming no expenses deduction (i.e., these are your profits after expenses), no pension contributions, and no student loan.
| Annual Profit | Income Tax | Total NI | Total Tax & NI | Take Home | Effective Rate |
|---|---|---|---|---|---|
| £15,000 | £486 | £325 | £811 | £14,189 | 5.4% |
| £20,000 | £1,486 | £625 | £2,111 | £17,889 | 10.6% |
| £25,000 | £2,486 | £925 | £3,411 | £21,589 | 13.6% |
| £30,000 | £3,486 | £1,225 | £4,711 | £25,289 | 15.7% |
| £35,000 | £4,486 | £1,525 | £6,011 | £28,989 | 17.2% |
| £40,000 | £5,486 | £1,826 | £7,312 | £32,688 | 18.3% |
| £50,000 | £7,486 | £2,426 | £9,912 | £40,088 | 19.8% |
| £60,000 | £11,432 | £2,636 | £14,068 | £45,932 | 23.4% |
| £75,000 | £17,432 | £2,936 | £20,368 | £54,632 | 27.2% |
| £100,000 | £27,432 | £3,436 | £30,868 | £69,132 | 30.9% |
Notice how the effective tax rate climbs from just 5.4% at £15,000 profit to 30.9% at £100,000. Above £100,000 the personal allowance starts to be withdrawn, creating an effective 60% marginal rate between £100,000 and £125,140. Use the calculator above to see your exact figures.
How Self-Employed Tax Works in 2026/27
As a self-employed worker in the UK, you pay tax on your profits — your total turnover minus allowable business expenses. The key taxes you pay are:
Income Tax: Same rates as employed workers. You get the £12,570 personal allowance tax-free, then pay 20% basic rate on profits up to £50,270, 40% higher rate up to £125,140, and 45% additional rate above that.
Class 2 National Insurance: A flat rate of £3.45 per week (£179.40/year) if your profits exceed £12,570.
Class 4 National Insurance: 6% on profits between £12,570 and £50,270, plus 2% on profits above £50,270. This is lower than the 8% employee NI rate.
Self-Employed Tax Example: £50,000 Turnover
If your annual turnover is £50,000 with £5,000 in expenses, your taxable profit is £45,000. Here's how the tax breaks down:
Income tax: 20% on £32,430 (£45,000 - £12,570) = £6,486
Class 2 NI: £179.40
Class 4 NI: 6% on £32,430 = £1,945.80
Total tax: £8,611.20
Take home pay: £36,388.80 per year or £3,032.40 per month
Allowable Expenses for Self-Employed
Claiming all legitimate expenses reduces your tax bill. Common allowable expenses include:
Office costs: Stationery, phone bills, internet, computer equipment, software subscriptions
Travel: Fuel, public transport, parking, hotel stays for business purposes (not commuting)
Working from home: Proportion of household bills (electricity, heating, broadband) — HMRC's simplified flat rate is £6/week
Professional costs: Accountant fees, professional memberships, trade subscriptions, insurance
Marketing: Website hosting, advertising, business cards, domain names
Stock and materials: Raw materials, goods for resale, packaging
Self-Employed vs Employed: Tax Comparison
Self-employed workers pay less National Insurance than employees — Class 4 NI is 6% compared to 8% employee NI. However, you miss out on employer pension contributions (typically 3-5%), statutory sick pay, paid holiday (28 days), and employer NI contributions. Use our contractor vs permanent calculator to compare the true difference.
When to Register as Self-Employed
You must register with HMRC as self-employed by 5 October in your business's second tax year. You'll need to file a Self Assessment tax return by 31 January each year (or 31 October for paper returns). Late registration can result in penalties.
Key deadlines for 2026/27:
Register by: 5 October 2027
File tax return by: 31 January 2028 (online) or 31 October 2027 (paper)
Pay tax by: 31 January 2028 (or in two payments on account)
Freelancer vs Sole Trader vs Limited Company
All three structures have different tax implications. Freelancers and sole traders are taxed identically — via Self Assessment on personal profits. A limited company pays corporation tax (25%) on profits and the director takes income via salary and dividends, which can be more tax-efficient above approximately £50,000 profit. Our calculator covers sole trader and freelancer tax. For limited company comparisons, see our dividend tax calculator.