£100,000 Salary After Tax UK 2025/26: The 60% Tax Trap

Quick answer

For the 2025/26 tax year, a £100,000 gross salary in England, Wales or Northern Ireland produces:

That's 67.8% keep rate. The marginal rate on the next pound earned is 42% (40% IT + 2% NI).

But above £100,000, things get nasty. See the £100k-£125,140 trap section below.

Where the deductions go

Plus your employer pays roughly £14,250 of employer NI on top (15% on earnings over £5,000) — total cost of your employment ≈ £114,250.

The £100,000 to £125,140 trap

This is the most punitive marginal rate band in the UK income tax system.

The mechanism:

• Personal Allowance is £12,570 normally.
• Above £100,000 of "adjusted net income", the PA reduces by £1 for every £2 of income.
• Lost at £125,140 (£100,000 + 2 × £12,570).

The effect on every extra £1 earned in this band:

• Direct income tax at 40%: £0.40.
• Personal Allowance reduction loses you £0.50 of allowance.
• That lost £0.50 of allowance was worth 40% × £0.50 = £0.20 of tax savings.
• So tax goes up by £0.20 just from the PA loss.
• Total income tax cost: £0.60.
• Plus 2% employee NI = £0.62.
• Effective marginal rate ≈ 60%.

Worked example — Lisa earning £105,000

Lisa's £5,000 of income above £100k:

• Direct income tax (40%): £2,000.
• PA lost: £2,500 of allowance × 40% = £1,000.
• NI (2%): £100.
• Total tax/NI on the £5k: £3,100.
• Net keep: £1,900 = 38% keep rate.

Compare to a £45,000 earner getting a £5,000 raise: that earner would pay £1,000 tax + £400 NI = £1,400 → keep £3,600 (72% keep rate).

The £100k earner pays roughly twice the tax per £1 of earnings.

Above £125,140 — the additional rate

Once your income passes £125,140:

• PA is gone entirely (£0).
• Income tax at additional rate: 45%.
• NI at 2% above Upper Earnings Limit.
• Marginal rate: 47%.

Counterintuitively, the marginal rate falls from 60% (in the £100k-£125,140 trap) to 47% (above £125,140). The 60% trap is a "spike" that gets less painful once you push through.

Worked example — full salary range

Comparing take-home, marginal rate, and effective tax burden at key points:

Above £100k, every salary increment is heavily taxed. The system creates strong incentives to either:

1. Stay below £100k by using pension sacrifice.
2. Push past £125,140 quickly into the slightly less-punitive additional rate band.

Escape route #1: Pension salary sacrifice

The single most powerful tool for £100k+ earners. Every £1 sacrificed:

• Reduces gross salary by £1.
• Reduces adjusted net income for the PA taper.
• Saves up to 62% in tax+NI for £100k-£125k earners.
• Goes into your pension where it grows tax-free.

Worked example — Mark, £110,000, sacrifices £10,000

Before sacrifice:

• Income tax on £110k: £30,432.
• NI: £4,965.
• Take-home: ~£74,603.

After sacrificing £10k into pension:

• "New" salary: £100,000 (back below the taper).
• Income tax: £27,432.
• NI: £4,765.
• Take-home: £67,803.
• Plus £10,000 in pension pot.

Mark's "lost" take-home from sacrificing: £74,603 - £67,803 = £6,800.

But he's gained £10,000 in his pension at a cost of £6,800. 32% effective discount on every £1 contributed.

For higher earners in the taper band, the rule of thumb: sacrifice down to £100k if you don't have a stronger short-term cash need.

Escape route #2: Gift Aid

Charitable donations reduce adjusted net income for the PA taper:

• £100 donation = £125 grossed-up (HMRC adds £25 to charity).
• Adjusted net income reduced by £125.
• For taper-band earners, this restores £62.50 of PA = £25 of tax savings.
• Plus higher-rate top-up at Self Assessment: £25 reclaim.
• Net cost to you of £125 donated to charity: £50.

The charity gets £125, you "spent" £50, HMRC effectively contributed £75. For £100k+ donors, Gift Aid is extraordinarily efficient.

See our Gift Aid post or use the calculator:

Other considerations at £100k+

HICBC (High Income Child Benefit Charge)

If you or your partner earns over £60k AND you receive Child Benefit, the higher earner pays HICBC. Above £60k, 1% clawback per £200 over the threshold; full clawback at £80k.

At £100k, you've fully lost Child Benefit. See our HICBC post for mitigation.

Tax-Free Childcare cap

The £100,000 income cap for Tax-Free Childcare eligibility (per parent) means £100k+ earners often lose this £2,000/child top-up entirely. Pension sacrifice down to £99,000 restores eligibility.

Marriage Allowance

Doesn't apply at £100k+ (only basic-rate taxpayers eligible).

Self Assessment

Mandatory at £100k+ — your income exceeds the £150,000 threshold often after small bonuses or BIK, but the £100k taper makes Self Assessment essentially required even if PAYE alone seems sufficient. HMRC sometimes still expects it.

Plan 2 student loan

For graduates with Plan 2 loans:

• 9% on income above £28,470.
• On £100k: £100,000 - £28,470 = £71,530 × 9% = £6,438/year.
• Combined with income tax + NI, takes net to roughly £61,365.

For Plan 5 (post-Aug 2023 starters): threshold £25,000, so deduction is slightly higher.

Scotland version

Scottish income tax on £100,000:

• PA £12,570 (UK-wide).
• Scottish bands apply above:
  • 19% × £2,827 = £537
  • 20% × £12,094 = £2,419
  • 21% × £16,171 = £3,396
  • 42% × £31,338 = £13,162
  • 45% × £24,999 = £11,250
• Total Scottish income tax: £30,764.
• vs English £27,432.
• Scottish taxpayer pays £3,332 more per year.

Scotland's higher-rate threshold is £43,663 (vs rUK £50,270), so much more of the salary falls into 42%.

Tax-efficient pay structure for £100k+

For higher earners (often through choice or aggressive employer offerings):

1. Maximise pension contributions — bring adjusted income to or below £100k.
2. Maximise ISA — £20k/year sheltered from future tax.
3. EV salary sacrifice if commuting (huge BIK savings).
4. Cycle to Work — modest but useful.
5. Charitable giving via payroll — like Gift Aid but auto-applied.
6. Bonus deferral — if employer offers, push next year if it crosses a band.

For very high earners (£150k+), the 47% marginal rate is unavoidable — but pension contributions remain valuable at 47p of tax saved per £1.

Try the numbers

Sources

• HMRC: Income Tax rates and Personal Allowance
• HMRC: National Insurance rates
• HMRC: Pension contributions and tax relief
• gov.uk: Personal Allowance reduction