Tax Planning12 min read

Last updated: March 2026 · Reflects 2025/26 tax year

PAYE vs Self-Employed Tax: Key Differences Explained for 2025/26

Thinking about going freelance, or wondering how your tax bill compares to someone on PAYE? Here's a complete breakdown of the differences in income tax, National Insurance, expenses, and take-home pay for the 2025/26 tax year.

Quick Summary: Key Differences

8%

PAYE Employee NI (Class 1)

6%

Self-Employed NI (Class 4)

2%

NI Saving on Main Band

Self-employed workers pay less National Insurance than PAYE employees on the same income — but they must file a Self Assessment tax return and pay their own tax bill.

Side-by-Side: PAYE vs Self-Employed

FeaturePAYE EmployeeSelf-Employed
How tax is collectedDeducted at source by employerPaid via Self Assessment
National InsuranceClass 1: 8% / 2%Class 2 + Class 4: 6% / 2%
Income tax bands20% / 40% / 45%20% / 40% / 45% (same)
Personal Allowance£12,570£12,570 (same)
ExpensesVery limited deductionsAllowable business expenses deducted before tax
Tax returnNot usually requiredSelf Assessment by 31 January
Payment timingPaid monthly from salary31 Jan + 31 Jul payments on account
PensionAuto-enrolled workplace pensionMust arrange own pension
Employer NIEmployer pays 13.8% on topNo employer NI (you are the employer)

Key takeaway: Income tax is identical for both. The main financial differences are National Insurance rates, the ability to claim expenses, and how/when you pay your tax. See the full rates on GOV.UK.

Income Tax: Same Bands, Different Starting Points

Both PAYE employees and self-employed workers pay income tax at the same rates and thresholds. The £12,570 personal allowance applies equally, and the 20%, 40%, and 45% bands are identical.

The crucial difference is that self-employed workers can deduct allowable business expenses from their income before tax is calculated. This means a self-employed person earning £40,000 in revenue with £5,000 of expenses only pays income tax on £35,000 of taxable profit.

Tax BandRateTaxable Income
Personal Allowance0%Up to £12,570
Basic Rate20%£12,571 – £50,270
Higher Rate40%£50,271 – £125,140
Additional Rate45%Over £125,140

Remember: These bands are the same for PAYE and self-employed. The difference is that self-employed workers calculate tax on their profits (revenue minus expenses), while PAYE employees pay tax on their gross salary.

National Insurance: The Biggest Difference

National Insurance is where PAYE and self-employed tax bills diverge most significantly. PAYE employees pay Class 1 NI at 8%, while self-employed workers pay Class 4 NI at just 6% on the same band. That's a 2 percentage point saving for the self-employed. See the full rates on GOV.UK.

PAYE: Class 1 NI

Below £12,5700%
£12,570 – £50,2708%
Above £50,2702%

Deducted automatically from your payslip each month by your employer.

Self-Employed: Class 2 + Class 4 NI

Class 2 (if profits over £12,570)£3.45/week
Class 4: £12,570 – £50,2706%
Class 4: Above £50,2702%

Paid through your Self Assessment tax return. Class 2 builds your State Pension entitlement.

The NI Advantage for Self-Employed

On the main earnings band (£12,570 – £50,270), self-employed workers pay 6% Class 4 NI compared to 8% Class 1 NI for PAYE employees. That's a 2% saving, worth up to £754 per year on the full band. The self-employed also pay £3.45/week Class 2 NI (£179.40/year), but even including this, the total NI bill is still lower.

Worked Example: £40,000 Income

Let's compare the tax bills for a PAYE employee earning £40,000 gross salary and a self-employed person with £40,000 taxable profit (after expenses). Both are in England/Wales with no student loan or pension contributions.

ItemPAYE EmployeeSelf-Employed
Gross Income / Profit£40,000£40,000
Personal Allowance£12,570£12,570
Taxable Income£27,430£27,430
Income Tax (20%)£5,486£5,486
National Insurance£2,194.40£1,825.20
Class 1 / Class 4£27,430 × 8% = £2,194.40£27,430 × 6% = £1,645.80
Class 2—£3.45 × 52 = £179.40
Total Tax + NI£7,680.40£7,311.20
Take-Home Pay£32,319.60£32,688.80

The Difference: £369.20 per year

On £40,000, the self-employed person takes home £369.20 more per year (£30.77/month) purely due to the lower NI rate. The income tax is identical.

However, PAYE employees also benefit from employer contributions to a workplace pension (minimum 3% under auto-enrolment), paid holidays, sick pay, and other employment rights that the self-employed must fund themselves.

Allowable Expenses: The Self-Employed Advantage

One of the biggest advantages of self-employment is the ability to deduct allowable business expenses from your income before calculating tax. PAYE employees generally cannot claim expenses against their salary (with very limited exceptions for things like professional subscriptions and uniform costs).

Common allowable expenses for self-employed workers include:

Office & Premises

  • • Home office costs (simplified: £6/week)
  • • Rent for business premises
  • • Utilities and business rates
  • • Office supplies and stationery

Travel & Transport

  • • Business mileage (45p/mile first 10,000)
  • • Public transport for business trips
  • • Parking and tolls
  • • Accommodation on business travel

Equipment & Technology

  • • Computers and software
  • • Phone bills (business proportion)
  • • Internet costs (business proportion)
  • • Tools and equipment

Professional Costs

  • • Accountancy fees
  • • Professional insurance
  • • Training directly related to your business
  • • Marketing and advertising

Example: Impact of £5,000 Expenses

A self-employed person with £40,000 revenue and £5,000 of allowable expenses pays tax on just £35,000 profit. At the basic rate, this saves £1,000 in income tax and £300 in Class 4 NI — a total saving of £1,300. PAYE employees earning £40,000 cannot claim these deductions.

Self Assessment and Payment Dates

Unlike PAYE employees who have tax deducted automatically each month, self-employed workers must file a Self Assessment tax return and pay their own tax bill. This requires careful cash flow management.

1

Register with HMRC

You must register as self-employed within 3 months of starting your business, or face a penalty.

2

Keep Records

Track all income and expenses throughout the tax year (6 April – 5 April). Keep records for at least 5 years.

3

File Your Tax Return

Deadline: 31 January following the end of the tax year (online). Paper returns due by 31 October.

4

Pay Your Tax Bill

Balance due by 31 January. If your bill exceeds £1,000, you also make payments on account.

Payments on Account Explained

If your Self Assessment bill is over £1,000, HMRC requires two advance payments towards next year's tax bill:

  • • 31 January — First payment on account (50% of previous year's bill)
  • • 31 July — Second payment on account (50% of previous year's bill)

This means in January you could owe the balance for the previous tax year plus the first payment on account for the current year — effectively 150% of a normal year's bill.

PAYE advantage: With PAYE, your tax is spread evenly across 12 monthly payments. You never need to worry about saving up for a large tax bill or meeting Self Assessment deadlines.

Pros and Cons at a Glance

PAYE Employment

Advantages

  • • Tax handled automatically — no paperwork
  • • Employer pension contributions (min. 3%)
  • • Paid holidays, sick pay, maternity/paternity pay
  • • Employment rights and redundancy protection

Disadvantages

  • • Higher NI rate (8% vs 6%)
  • • Very limited expense deductions
  • • Less flexibility in working arrangements

Self-Employment

Advantages

  • • Lower NI rate (6% vs 8%)
  • • Claim allowable business expenses
  • • Flexibility and independence
  • • Potential for higher earnings

Disadvantages

  • • Must file Self Assessment and manage cash flow
  • • No employer pension, sick pay, or holiday pay
  • • No employment rights or redundancy protection
  • • Responsible for all admin and accountancy

Calculate Your Take-Home Pay

Use our free calculators to see exactly how much you'd take home as a PAYE employee or estimate your self-employed tax bill.

PAYE Take-Home Calculator →Self-Employed Tax Guide →

Disclaimer: This guide is for informational purposes only and should not be considered financial or tax advice. Tax rates and thresholds are for the 2025/26 tax year and are subject to change. Self-employed tax calculations depend on your individual circumstances, including allowable expenses and other income. Always consult with a qualified accountant or tax adviser for personalised guidance. For official information, visit GOV.UK Self Assessment.

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