UK Effective Marginal Tax Rate Calculator 2026/27: 60% Trap, HICBC, Student Loan, UC
UK effective marginal tax rate calculator 2026/27 - shows real tax rate on each extra £1 earned including 60% Personal Allowance taper £100k-£125k, High Income Child Benefit Charge £60k-£80k, student loan repayment Plan 1/2/4/5/PG, Class 1 NI 8% / 2%, Employer NI 15%, Universal Credit 55% taper. Stacked marginal rate up to 80% in some scenarios.
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 |
| £29,385 | 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 £29,385).
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 £26,900 |
| Plan 2 student loan | 9% | Above £29,385 |
| Plan 4 student loan (Scotland) | 9% | Above £33,795 |
| 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 |
Related calculators + guides
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 (2026/27 per uk-2026-27.ts canonical). Plan 1 £26,900. Plan 2 £29,385. Plan 4 £33,795 (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 6% / 2% (2026/27 per canonical), no Employer NI directly, Class 2 voluntary £3.65/week if profit below the £7,105 Small Profits Threshold (SPT) (auto-credit above SPT post-April-2024 reform). Self-employed slightly lower marginal at basic rate.
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 an Individual Savings Account (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% Benefit in Kind (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.