£100k After Tax in the UK — How Much You Really Take Home in 2026/27?

When someone says “I earn £100,000 a year”, that sounds like a lot. But what really matters to most people is their take-home pay, or how much they keep after tax and National Insurance (NI). At AccFirm, we know that understanding your actual net income is key to financial planning, budgeting and knowing whether you’re better off as an employee or self-employed. In this guide, we explore what “£100k after tax” means in the UK tax year 2026/27, what the breakdown is for employee vs self-employed, and how you can smartly reduce your tax burden.

What “£100k after tax” Means

The phrase “£100k after tax” can be misleading. It could mean:

• You want to take home £100,000 net (after all tax/NI) – in which case your gross income must be higher.
• You earn a gross £100,000 and want to know what you’ll actually receive after deductions.

For most readers, this second scenario applies. You have a gross salary of £100,000, and you ask: how much will I keep?
Getting this number right helps with lifestyle decisions (home purchase, investment, savings) and also helps when comparing employment vs self-employment, or planning for pension contributions. At AccFirm, our accounting and payroll services help clients map gross to net accurately.

UK Tax Rates for 2026/27 (HMRC Verified)

To calculate take-home pay, we must first understand the UK tax system. For the tax year running from 6 April 2026 to 5 April 2027:

• The standard Personal Allowance is £12,570.
• Income Tax bands:
  • 0 % on taxable income up to £12,570.
  • 20 % (“basic rate”) on taxable income from £12,571 to £50,270.
  • 40 % (“higher rate”) on income from £50,271 to £125,140.
  • 45 % (“additional rate”) on income over £125,140.

Important special rule: If your income exceeds £100,000, your Personal Allowance starts to taper (reduce) by £1 for every £2 earned above £100,000, and is fully lost when income reaches £125,140.
For National Insurance (NI), for employees:

• The Primary Threshold for Class 1 employee contributions is £242 per week (≈ £12,570 annually)
• 8 % on earnings between £242 and £967 per week.
• 2 % on earnings above the Upper Earnings Limit (£967 per week).

Armed with these figures, we can estimate net pay for someone earning £100k.

Take-Home Pay for a £100,000 Salary in 2026/27

Employee scenario – gross salary £100,000

Let’s walk through the calculation step by step (approximate).

Gross salary: £100,000
Personal Allowance: Normally £12,570, but since the income is £100,000, the allowance is reduced: the taper begins at £100,000; however, at exactly £100000, the allowance is still full. Hence allowance = £12,570.
Taxable income = £100,000 – £12,570 = £87,430.

Income Tax:

• First £37,700 of taxable (i.e. from £12,571 to £50,270) at 20% = £37,700 × 20% = £7,540
• Remaining taxable (£87,430 – £37,700 = £49,730) at 40% = £19,892
• Total Income Tax ≈ £7,540 + £19,892 = £27,432

National Insurance:

• Earnings above £12,570 up to £100,000 = £100,000 – £12,570 = £87,430
• From £12,570 to upper limit (£50,270), etc., we can approximate: NI at 8% on earnings between £12,570 and £50,270 → £37,700 × 8% = £3,016
• Then NI at 2% on earnings above £50,270 (which is £100,000-£50,270 = £49,730) → £49,730 × 2% = £995
• Total NI approx = £3,016 + £995 = £4,011

Net (take-home) pay: £100,000 – £27,432 – £4,011 = £68,557 approx
Monthly take-home ≈ £5,713; Weekly ≈ £1,318.

Important note on Personal Allowance taper

If you earn somewhat above £100,000 your allowance reduces. For example, at £110,000 your allowance would be £12,570 – (£10,000 ÷ 2) = £7,570 (because £10k above £100k means £5k reduction), making taxable income higher and effective tax rate greater. This is often called the “lost allowance” zone.

• Gross: £100,000
• Income Tax: ~£27,432
• National Insurance: ~£4,011
• Approx Take-Home: £68,557

At AccFirm, we help clients run these calculations for their personal circumstances and show how small adjustments (e.g., pension contributions) can raise the net figure.

Self-Employed Income – £100k After Tax

If instead you are self-employed (sole trader) earning £100,000 profit before tax, the calculation is slightly different: you pay Income Tax (same bands) plus Class 2 and Class 4 National Insurance, not Class 1.

For illustrative purposes:

• Assume profit £100,000, no other reliefs.
• Personal Allowance still £12,570, taxable income £87,430 (as above) → Tax ~£27,432.
• Class 4 NI: rate is 9% on profits between £12,570 and £50,270, and 2% above that (2026/27). Rough calculation:
  • £37,700 × 9% ≈ £3,393
  • £49,730 × 2% ≈ £995
  • Total Class 4 NI ≈ £4,388
• Class 2 NI is a flat, small amount (approximately negligible for this scale).
• Estimated net = £100,000 – £27,432 – £4,388 = ≈ £68,180

The difference between employee vs self-employed isn’t huge at exactly £100k for these approximations, but depending on deductions, pension contributions, expenses, the self-employed may have more scope to reduce taxable profit, and hence net income can vary. Our Payroll and Bookkeeping Services assist businesses and sole traders in maximising net income legally.

Reducing Your Tax Legally

If you’re aiming to keep more of your £100k income:

• Pension contributions: By contributing to a pension scheme, you reduce your taxable income.
• Salary sacrifice: For employee,s you may sacrifice salary into a pension or other benefits, reducing tax and NI.
• Allowable expenses: If self-employed, ensure you claim all business expenses before profit.
• Charitable donations / Gift Aid: Can reduce higher-rate tax liability.
• Review structure: Sometimes, working through a limited company may give advantages (depending on circumstances).
  At AccFirm, our Accounting Services include tailored tax planning to maximise income after tax while fully compliant with HMRC.

How AccFirm Can Help

Whether you’re an employee earning £100k or a business owner/self-employed individual, our accountants in London aids in:

• Accurate net income projections (give you your true “100k after tax” figure).
• Structuring payroll and company affairs (via our Payroll Services).
• VAT, corporation tax, compliance — we link all your accounting needs.
• Planning for changes: e.g., pension changes, bonus income, self-employment profits.
  For a tailored assessment, visit our Contact Us page or request an Instant Quote.

Conclusion Plan Smart, Keep More

Earning £100,000 is a strong position but what matters is how much you take home. With the tax year 2026/27’s fixed thresholds and tapering of allowances after £100k, that net figure is crucial. At AccFirm, we advise that you don’t just focus on gross; you focus on net income, tax planning and efficient payroll/accounting. If you’d like us to calculate your precise net income and suggest ways to improve it, we’re ready to help.