UK Effective Marginal Tax Rate Calculator 2026/27

Headline tax rates lie. The 40% higher rate becomes 62% with PA taper, 71% with student loan, 80%+ with HICBC + Plan 2 + PG loan. This calculator shows the REAL marginal rate at each income level - what you keep on the next £1 earned including income tax, National Insurance, student loan, Personal Allowance taper, High Income Child Benefit Charge, and Universal Credit withdrawal where applicable.

Effective marginal rate by income 2026/27

Income	Effective marginal	Components	Note
£12,570	0%	PA threshold	No tax / NI yet
£15,000	28%	IT 20% + NI 8%	Basic rate + Class 1 NI
£27,295	37%	IT 20% + NI 8% + Plan 2 SL 9%	Graduate Plan 2 kicks in
£50,270	49%	IT 40% + NI 2% + SL 9% (transition)	Higher rate threshold
£60,000	64%	IT 40% + NI 2% + SL 9% + HICBC 1% per £200 (2 children)	HICBC starts £60k
£80,000	51%	IT 40% + NI 2% + SL 9% (HICBC complete)	HICBC fully tapered at £80k
£100,000	51%	IT 40% + NI 2% + SL 9%	PA taper just begins
£110,000	71%	IT 40% + IT 40% on lost PA + NI 2% + SL 9%	60% trap zone
£125,140	51%	IT 40% + NI 2% + SL 9%	PA fully tapered
£130,000	56%	IT 45% + NI 2% + SL 9%	Additional rate
£150,000	56%	IT 45% + NI 2% + SL 9%	Additional rate continues

Stacking examples - real scenarios

40-year-old higher-rate worker with 2 kids, Plan 2 SL, £105k salary

Income tax higher rate: 40%
Class 1 NI rate above primary threshold: 2%
Plan 2 Student Loan: 9%
PA taper effective: 20% (£1 PA lost per £2 income → 40% × 0.5 = 20%)
HICBC already complete at £80k - no further cost
TOTAL EFFECTIVE MARGINAL: 71%

Each extra £1 of salary keeps only 29p. Bonus or extra hours unattractive without pension sacrifice.

£70k earner with 3 kids, Plan 2 SL, partner not working

Income tax higher rate: 40%
Class 1 NI: 2%
Plan 2 SL: 9%
HICBC at £70k = 50% of £60k-£80k clawback range = 25% of total CB
£60k+ HICBC tapering 1% per £200 above £60k = 50% per £10k = 5% of total CB per £1k = 0.5% per £100
3 children CB ~£3,400/year → HICBC marginal ~17% of CB / £20k income = 0.085 per £ income in £60-80k range = 8.5%
TOTAL EFFECTIVE MARGINAL: 59.5%

Each extra £1 keeps only 40p. 3-kid HICBC stack is severe in £60k-80k zone.

£105k earner with no kids, no student loan

Income tax higher rate: 40%
Class 1 NI: 2%
PA taper: 20%
No SL, no HICBC
TOTAL EFFECTIVE MARGINAL: 62%

60% trap variant. Pension sacrifice from £100-125k extracts 62p per £1.

Universal Credit claimant in part-time work earning £15k extra

Income tax 20%
Class 1 NI 8%
UC withdrawal at 55p per £1 net earnings = ~40% of gross above work allowance
TOTAL EFFECTIVE MARGINAL: 68%

Low-income work tapering combined with UC means most low-income marginal rates >50%.

Sole trader £30k profit + Plan 5 student loan (graduated post Aug 2023)

Income tax 20%
Class 4 NI 8%
Plan 5 SL 9% above £25k
TOTAL EFFECTIVE MARGINAL: 37%

Self-employed pays slightly less than employed in basic-rate band (NI 8% vs Class 1 8%). Plan 5 starts £25k (vs Plan 2 £27,295).

The 60% Trap zone (£100k-£125,140)

Income	PA available	Effective rate (no SL no HICBC)
£99,999	£12,570	42%
£100,000	£12,570	62%
£110,000	£7,570	62%
£120,000	£2,570	62%
£125,140	£0	62%
£125,141	£0	47%

Component rates that stack

Component	Rate	Applies when
Income tax basic	20%	£12,571 - £50,270
Income tax higher	40%	£50,271 - £125,140
Income tax additional	45%	Above £125,140
Class 1 NI main	8%	£12,570 - £50,270
Class 1 NI upper	2%	Above £50,270
PA taper effect	20%	£100,000 - £125,140
HICBC (per £200 above £60k, full clawback by £80k)	0-100% of CB	£60,001 - £80,000
Plan 1 student loan	9%	Above £24,990
Plan 2 student loan	9%	Above £27,295
Plan 4 student loan (Scotland)	9%	Above £31,395
Plan 5 student loan (post Aug 2023)	9%	Above £25,000
Postgraduate Loan	6%	Above £21,000
UC withdrawal (effective on gross)	~40%	Above work allowance

Frequently asked questions

What is effective marginal rate and why does it matter?

Marginal rate is the tax on the NEXT pound earned, not the average. Critical for decisions about: overtime, bonuses, salary sacrifice, second jobs, side hustles, pension contributions. Headline 40% can hide effective 71% in 60% trap zones. Always think marginal, not average, when evaluating extra earnings.

What is the 60% tax trap?

Income £100,000-£125,140 effective rate 60% (income tax 40% + PA taper 20%). Personal Allowance £12,570 reduces by £1 per £2 income above £100k - lost entirely at £125,140. Each £1 above £100k loses 0.5p of allowance = 0.5p × 40p tax = 20p extra tax + 40p direct = 60p total. ADD NI 2% = 62%. ADD student loan 9% = 71%. ADD HICBC if children = up to 80%+.

How does HICBC stack into marginal rate?

High Income Child Benefit Charge: 1% of CB per £200 of income above £60,000, up to £80,000 (then fully clawed back). At £70k with 2 kids (~£2,200 annual CB), HICBC marginal effect = 50% × £2,200 / £20k = 5.5% on each £ in £60-80k zone. With 3 kids (~£3,400 CB) HICBC marginal ~8.5%. Stacked with income tax + NI + SL, total can reach 65%+.

Student loan repayments add to marginal rate - by how much?

All plans charge 9% on income above plan threshold. Plan 1 £24,990. Plan 2 £27,295. Plan 4 £31,395 (Scotland). Plan 5 £25,000 (post-Aug 2023 starters). Postgraduate Loan 6% above £21,000. Total possible: 15% (Plan 2 + PG combined). Adds directly to marginal rate at all income levels above relevant threshold.

How does Universal Credit interact with marginal rate?

UC tapers 55p per £1 of NET earnings above work allowance. Combined with PAYE: roughly 40-44% effective gross-income taper. Plus income tax + NI as normal. Typical low-income worker on UC has effective marginal rate 60-75%. Specifically penalises low-income work. Some workers see <30p kept per £1 extra earned.

Can pension sacrifice reduce my effective marginal rate?

Yes - pension contributions reduce ADJUSTED income for HICBC + PA taper purposes. £105k earner sacrificing £5k into pension drops adjusted income to £100k - exits 60% trap. Pension contribution effectively gets 62% relief (40% IT + 20% PA-taper saved + 2% NI saved). Single most efficient strategy in the £100-125k band.

Scottish tax bands change the calculation - how?

Scotland: starter 19%, basic 20%, intermediate 21%, higher 42%, advanced 45%, top 48%. Scottish higher rate £43,663-£75,000 already at 42% (vs England 40%). Above £75k Scottish advanced 45% + NI 2% + SL 9% = 56% before PA taper. PA taper same UK-wide: above £100k adds 21% effective in Scotland (42% × 0.5) so Scottish 100-125k trap = 65%+ (higher than English equivalent). Scottish top rate 48% above £125,140.

Self-employed marginal rates - same as employed?

Mostly yes for income tax + student loan. National Insurance differs: Employed: Class 1 8% / 2% (employee) + 15% Employer NI. Self-Employed: Class 4 8% / 2%, no Employer NI directly, Class 2 voluntary £3.50/week if profit below £6,725. Self-employed slightly lower marginal at basic rate (8% vs ~23% combined Class 1 + Employer NI economic burden on the employer).

How can I minimise marginal rate impact when receiving a bonus?

Strategies: (1) Pension sacrifice all/most of bonus: 62%+ effective relief in 60% trap. (2) Spread bonus over 2 tax years: avoid push into higher band single-year. (3) Use ISA wrapper for after-tax savings: tax-free growth. (4) Charitable Gift Aid: lowers adjusted income for HICBC + PA taper. (5) EV salary sacrifice: 2% BIK rate makes it tax-efficient. (6) Cycle-to-work salary sacrifice: up to £1k+ tax-efficient. (7) Holiday vs cash trade: time off avoids tax entirely.

What is the actual highest effective marginal rate scenario?

Combinations can reach 75-85%+: (a) £105k earner with 3 children (HICBC complete at £80k so just adds to baseline), Plan 2 SL, PG loan: 40 + 2 + 9 + 6 + 20 (PA taper) = 77%. (b) £70k earner with 3 children mid-HICBC zone: 40 + 2 + 9 + ~8.5 = 59.5%. (c) Scottish £105k 3 kids Plan 2 + PG: 42 + 2 + 9 + 6 + 21 (PA taper Scottish) = 80%. (d) UC claimant working part-time: combined 70-80% rate. Effective hourly wage drops to subminimum levels.

Related calculators + guides

Sources + statute references

Data retrieved 2026-06-06. Rates accurate for tax year 2026/27.