The comparison between sole trader and PAYE employment is often framed as a question of tax rates, but the full answer involves several layers: how income tax applies (identically), how National Insurance differs materially, which expenses can be deducted, how pension contributions are treated, and what non-tax factors affect the practical difference in take-home income.
Updated 2026/27 · SoleTraderTaxCalculator.co.uk · Editorial standards · Methodology
Income tax rates are identical for employed and self-employed people. The Personal Allowance (£12,570 for 2026/27), basic rate (20% to £50,270), higher rate (40% to £125,140) and additional rate (45% above £125,140) apply regardless of whether income comes from PAYE employment or sole trader profit. The mechanism differs — PAYE deducts tax at source monthly, while sole traders pay through Self Assessment annually — but the tax on the same income amount is the same.
The practical difference on the income tax side arises from what the taxable figure actually is. An employee is taxed on gross salary with limited deduction options. A sole trader is taxed on taxable profit after all allowable business expenses. If a sole trader has £60,000 in fees and £12,000 in genuine business expenses, their taxable profit is £48,000 — the income tax calculation starts from that lower figure.
National Insurance is where the comparison becomes genuinely complex. PAYE employees pay Class 1 employee NI at 8% on earnings between £12,570 and £50,270, and 2% above that threshold. Their employer simultaneously pays employer NI at 15% on earnings above £5,000 — a cost the employer bears directly and which the employee typically does not see as a deduction from their pay.
Sole traders pay Class 4 NI at 6% on profits from £12,570 to £50,270, and 2% above that. Class 2 NI was abolished from April 2024. The main rate on Class 4 (6%) is lower than the employee Class 1 rate (8%) by 2 percentage points, and the sole trader does not incur employer NI on their own profit. This means that at equivalent income levels, a sole trader's total NI bill is lower than an employee's employee NI — and significantly lower than the total employment cost once employer NI is considered.
The trade-off is that employed workers benefit from employer NI contributions indirectly through the employer's total cost of employing them. Day-rate contractors who compare their contract rate with an employed equivalent salary should compare total employment cost (salary plus employer NI plus benefits) against contract rate, rather than just comparing net pay figures.
Employees can deduct expenses against employment income only in narrow circumstances — professional subscriptions, mileage for business travel beyond the workplace, and certain tools. Most employment costs are simply not deductible against tax. A PAYE worker who pays for their own software, a home office or equipment generally cannot deduct those costs from taxable income.
Sole traders can deduct all genuine business expenses — software, equipment, insurance, professional fees, mileage at HMRC approved rates, a proportion of home costs, and more — before arriving at the taxable profit figure. For a professional sole trader with substantial genuine costs, this can produce a meaningfully lower taxable income than an employed person earning the same gross fees.
This structural difference is part of why comparing 'gross income' figures between employment and self-employment can be misleading. A freelancer charging £80,000 per year in fees may have taxable profit of £65,000 after expenses. The correct comparison is to map £65,000 profit as a sole trader against a £65,000 PAYE salary — not against £80,000.
PAYE employees often benefit from employer pension contributions — money the employer adds on top of the employee's own contribution, representing an additional employment benefit not visible in the salary figure. A generous employer may contribute 5–10% of salary into a pension, substantially improving the retirement position at no cost to the employee beyond their own contribution.
Sole traders fund pensions personally through a self-invested personal pension (SIPP) or similar product. There is no employer contributing alongside them. Personal pension contributions made by sole traders attract tax relief at the marginal rate, reducing income tax but not Class 4 NI. The net cost of a pension contribution as a sole trader is therefore (100% minus income tax rate) per pound contributed.
For those comparing employment offers against self-employment income, employer pension contributions should be treated as part of the total employment package — not ignored. A £60,000 salary with 8% employer pension contributions has a total employment cost of approximately £71,600 when employer NI and pension are both included.
Consider a sole trader with £60,000 taxable profit versus a PAYE employee earning £60,000 salary in England for 2026/27. Sole trader: income tax approximately £19,432 (20% on £12,570–£50,270 = £7,540, 40% on £50,271–£60,000 = £3,892, plus basic rate calculation from personal allowance). Class 4 NI: 6% × (£50,270 − £12,570) = £2,262, plus 2% × (£60,000 − £50,270) = £195. Total NI: £2,457. Total tax: approximately £21,889. Take-home: approximately £38,111.
PAYE employee at £60,000 salary: income tax is approximately the same amount since the rates are identical. Employee Class 1 NI: 8% × (£50,270 − £12,570) = £3,016, plus 2% × (£60,000 − £50,270) = £195 = approximately £3,211. Total NI is approximately £754 higher than the sole trader's Class 4 NI. The employee take-home is therefore approximately £754 lower all else being equal — before factoring in business expenses, pension, or employer contributions.
The employer also pays 15% employer NI on the salary above £5,000 — approximately £8,250 on a £60,000 salary. This means the total employment cost to the employer is approximately £68,250 to put £60,000 in a PAYE employee's hands. A contractor at the same effective income level would need to invoice approximately £71,000 to cover comparable remuneration and tax after accountancy costs.
It depends on the comparison being made. Income tax rates are the same. Class 4 NI (6%) is lower than Class 1 employee NI (8%) at the main rate. Sole traders also benefit from business expense deductions that PAYE employees generally cannot access. At equivalent gross income levels, a sole trader with genuine business expenses typically has a lower total tax bill.
Yes, when comparing day rates against PAYE salaries. A contractor rates negotiation should compare the contractor's total cost (including all taxes) against the equivalent total employment cost (salary plus employer NI plus benefits). Comparing only net take-home figures gives an incomplete picture.
Enter your sole trader taxable profit (after expenses) here and note the take-home figure. Then use AfterTaxSalary.co.uk to enter the equivalent PAYE salary and compare. Keep the profit and salary figures identical to isolate the structural tax difference.
Yes. Personal pension contributions reduce taxable income for income tax purposes, saving 20% at basic rate or 40% at higher rate. They do not reduce Class 4 NI. Use the pension field in this calculator to model the effect on your take-home and tax bill.
The sole trader tax calculator turns this guidance into a concrete monthly take-home and tax reserve estimate, based on 2026/27 HMRC rates. Enter taxable profit — not turnover.