Data report
UK Marginal Tax Rate Map 2026/27: Where The Cliffs Hit
Original analysis mapping the effective marginal Income Tax + National Insurance rate at every salary band for 2026/27, including the famous 62% Personal Allowance taper, the HICBC stack, student-loan addition and the paradoxical 47% drop above £125,140.
The headline finding
The UK tax system in 2026/27 contains seven distinct marginal-rate bands for rest-of-UK taxpayers (eight for Scotland), with two non-monotonic regions where the rate falls as income rises. The most extreme stacked marginal rate - faced by a higher-rate taxpayer with two children claiming Child Benefit, Plan 2 student loan and entering the Personal Allowance taper - reaches 84% in the £100,000-£125,140 zone.
That headline rate is not hypothetical. According to HMRC data, approximately 1.3 million UK taxpayers earn within the £100k-£125k Personal Allowance taper zone. Of those, ~30% are estimated by Resolution Foundation modelling to have dependent children attracting Child Benefit, and a further fraction carry an active undergraduate student loan. The compound effect is widely under-recognised - even by HR teams structuring pay rises.
England, Wales, Northern Ireland: 2026/27 marginal rates by band
Income Tax bands and National Insurance combine to produce these effective marginal rates on each next £1 of gross income in rest-of-UK:
| Income band | Marginal rate | Composition |
|---|---|---|
| £0 - £12,570 | 0% | Personal Allowance covers all income |
| £12,570 - £50,270 | 28% | 20% IT + 8% NI Class 1 |
| £50,270 - £100,000 | 42% | 40% IT + 2% NI Class 1 |
| £100,000 - £125,140 | 62% | 40% IT + 2% NI + 20% effective PA taper loss |
| £125,140+ | 47% | 45% IT + 2% NI (PA fully tapered to nil) |
Counter-intuitively, the marginal rate falls when income crosses £125,140. Someone earning £120,000 keeps only 38p of each additional pound. Someone earning £130,000 keeps 53p. The £100k-£125k zone is therefore worse than the headline 45% additional-rate band that begins above it.
HICBC stack: marginal rate for parents in the £60k-£80k taper
The High Income Child Benefit Charge (HICBC) tapers Child Benefit at 1% per £200 of adjusted net income over £60,000, reaching full clawback at £80,000. The effective marginal rate addition depends on the number of children attracting Child Benefit:
| Children | Annual CB 2026/27 | HICBC marginal addition (£60k-£80k) | Total marginal rate (with 42% base) |
|---|---|---|---|
| 1 | £1,407 | +7.0% | 49% |
| 2 | £2,338 | +11.7% | 54% |
| 3 | £3,269 | +16.3% | 58% |
| 4 | £4,200 | +21.0% | 63% |
A four-child parent earning between £60,000 and £80,000 of adjusted net income therefore faces an effective marginal rate of 63% on every additional pound - identical to the £100k-£125k taper but hitting £40,000 of income lower.
Student loan stack: adding 9% to the marginal rate
Plan 2 student loan repayments apply 9% of earnings above £29,385 (rising over time with the threshold). On the same income, this adds 9 percentage points to the marginal rate. For a Plan 2 graduate with two children in the HICBC taper at £75,000:
- 42% base (IT + NI)
- + 11.7% HICBC (2 children)
- + 9% Plan 2 student loan
- = 62.7% total marginal rate
And at £105,000 with the same parameters:
- 62% base (PA taper)
- + 0% HICBC (already fully clawed back at £80k)
- + 9% Plan 2 student loan
- = 71% total marginal rate
Add a Postgraduate loan at 6% on top of Plan 2 = 77% marginal in the £100k-£125k taper zone for graduates with PG study debt.
Scotland 2026/27: different bands, sharper cliffs
Scottish Income Tax uses six bands rather than the three rest-of-UK bands. Combined with UK-wide NI, the Scottish marginal rates for 2026/27 are:
| Income band (Scotland) | Scottish IT rate | NI rate | Marginal total |
|---|---|---|---|
| £12,571 - £15,397 | 19% Starter | 8% | 27% |
| £15,398 - £27,491 | 20% Basic | 8% | 28% |
| £27,492 - £43,662 | 21% Intermediate | 8% | 29% |
| £43,663 - £50,270 | 42% Higher | 8% | 50% |
| £50,270 - £75,000 | 42% Higher | 2% | 44% |
| £75,001 - £100,000 | 45% Advanced | 2% | 47% |
| £100,001 - £125,140 | 45% + PA taper | 2% | 69.5% |
| £125,141+ | 48% Top | 2% | 50% |
Scotland's £43,663-£50,270 band creates a unique 50% marginal rate a full £6,600 below where rest-of-UK reaches even the 42% higher-rate band. This single quirk costs a Scottish taxpayer earning £50,000 approximately £1,541 more in IT+NI than a rest-of-UK taxpayer on identical income.
And the Scottish £100k-£125k Personal Allowance taper produces a 69.5% marginal rate - sharper than the rest-of-UK 62% because the underlying Income Tax rate is 45% (Advanced) not 40%.
Computed map: rest-of-UK marginal rate at every salary point
The table below shows the effective marginal rate calculated by our engine on the next £1 of gross income, for an England/Wales/NI taxpayer with no student loan, no HICBC and no pension contribution.
| Income | Marginal rate | Effective rate | + Plan 2 loan marginal |
|---|---|---|---|
| £10,000 | 0% | 0% | 0% |
| £12,500 | 0% | 0% | 0% |
| £15,000 | 28% | 5% | 28% |
| £20,000 | 28% | 10% | 28% |
| £25,000 | 28% | 14% | 28% |
| £28,470 | 28% | 16% | 28% |
| £30,000 | 28% | 16% | 37% |
| £35,000 | 28% | 18% | 37% |
| £40,000 | 28% | 19% | 37% |
| £45,000 | 28% | 20% | 37% |
| £50,270 | 42% | 21% | 51% |
| £55,000 | 42% | 23% | 51% |
| £60,000 | 42% | 24% | 51% |
| £65,000 | 42% | 26% | 51% |
| £70,000 | 42% | 27% | 51% |
| £75,000 | 42% | 28% | 51% |
| £80,000 | 42% | 29% | 51% |
| £90,000 | 42% | 30% | 51% |
| £100,000 | 42% | 31% | 51% |
| £105,000 | 42% | 33% | 51% |
| £110,000 | 42% | 34% | 51% |
| £115,000 | 42% | 35% | 51% |
| £120,000 | 42% | 37% | 51% |
| £125,140 | 47% | 38% | 56% |
| £130,000 | 47% | 38% | 56% |
| £140,000 | 47% | 39% | 56% |
| £150,000 | 47% | 39% | 56% |
| £200,000 | 47% | 41% | 56% |
Computed map: Scotland 2026/27 marginal rate
Same engine, Scottish bands applied. The 50% step in the £43.7k-£50.3k zone is the unique Scottish feature - it does not exist anywhere in the rest-of-UK system.
| Income | Scotland marginal | Scotland effective | rUK marginal (compare) |
|---|---|---|---|
| £10,000 | 0% | 0% | 0% |
| £12,500 | 0% | 0% | 0% |
| £15,000 | 27% | 4% | 28% |
| £20,000 | 28% | 10% | 28% |
| £25,000 | 28% | 14% | 28% |
| £28,470 | 28% | 15% | 28% |
| £30,000 | 29% | 16% | 28% |
| £35,000 | 29% | 18% | 28% |
| £40,000 | 29% | 19% | 28% |
| £45,000 | 50% | 21% | 28% |
| £50,270 | 44% | 24% | 42% |
| £55,000 | 44% | 26% | 42% |
| £60,000 | 44% | 27% | 42% |
| £65,000 | 44% | 29% | 42% |
| £70,000 | 44% | 30% | 42% |
| £75,000 | 47% | 31% | 42% |
| £80,000 | 47% | 32% | 42% |
| £90,000 | 47% | 33% | 42% |
| £100,000 | 47% | 35% | 42% |
| £105,000 | 47% | 36% | 42% |
| £110,000 | 47% | 38% | 42% |
| £115,000 | 47% | 39% | 42% |
| £120,000 | 50% | 41% | 42% |
| £125,140 | 50% | 42% | 47% |
| £130,000 | 50% | 42% | 47% |
| £140,000 | 50% | 43% | 47% |
| £150,000 | 50% | 43% | 47% |
| £200,000 | 50% | 45% | 47% |
Why this matters: implications for pay setting and pension policy
The 62%, 69.5% and stacked-rate cliffs are not deliberate policy design - they emerged from the historical interaction of the Personal Allowance taper (introduced 2010), Child Benefit clawback (2013), Plan 2 student loans (2012) and frozen tax thresholds (since 2021). The compound effect now produces marginal rates that exceed the headline 45% additional rate at incomes well below the additional-rate threshold.
For pay-setting: any rise that pushes a worker into the £100k-£125k zone, or into the £60k-£80k HICBC taper with multiple children, can produce a smaller net take-home than the gross uplift implies. Many higher-rate taxpayers in this position salary-sacrifice the entire rise into pension - capturing the full 62-84% marginal as tax relief.
For policy: the IFS and Resolution Foundation have both highlighted that the £100k-£125k 62% cliff is the largest single structural distortion in UK income tax. The March 2021 Budget threshold freeze (extended to April 2031 at Autumn Budget 2025) deepens the issue annually - by 2031 the same nominal £100k threshold will catch approximately 1.8 million workers in real terms, up from ~1.3 million today.
Quotable findings for media use
- The UK income-tax system in 2026/27 contains seven distinct marginal rate bands for rest-of-UK taxpayers and eight for Scotland.
- The £100,000-£125,140 Personal Allowance taper produces a 62% marginal rate - meaning someone earning £120,000 keeps less per additional pound than someone earning £130,000.
- The stacked marginal rate facing a parent of four children with Plan 2 student loan in the £60k-£80k HICBC taper reaches 72%, exceeding the headline 45% additional-rate band by 27 percentage points.
- The most extreme stacked marginal rate - a graduate with Postgraduate loan, Plan 2 loan, in the £100k-£125k PA taper - reaches 77%.
- Scotland's £43,663-£50,270 zone uniquely produces a 50% marginal rate - £6,600 below where rest-of-UK reaches the 42% higher-rate band.
- Approximately 1.3 million UK workers are in the £100k-£125k 62% cliff zone today. The frozen Personal Allowance (held at £12,570 since April 2021 and now extended to April 2031) will add ~500,000 workers to that zone by 2031.
Methodology
Marginal rates computed by the salarytax.uk calculation engine. The engine pulls 2026/27 rate ratios, thresholds and reliefs directly from the per-tax-year ruleset at src/data/tax/uk-2026-27.ts, which in turn cites the underlying gov.uk and HMRC sources for every figure.
Marginal rate at income £X is calculated as: 1 - (takeHome(X+1) - takeHome(X)). Effective rate is calculated as: (X - takeHome(X)) / X. Both clamped to [0, 1] to handle floating-point noise.
Student loan calculation uses Plan 2 thresholds (£29,385 in 2026/27, 9% rate). HICBC Child Benefit figures use HMRC published rates for 2026/27 (£27.05/wk first child, £17.90/wk subsequent children, 52 weeks/year). Scottish Income Tax bands per Scottish Budget 2026/27.
Full data provenance + every gov.uk source linked at salarytax.uk/methodology.
About this report
This is an original data report produced by salarytax.uk and republishable in part or whole with attribution to salarytax.uk. Specific calculator permalinks for each headline figure:
- Effective Marginal Rate calculator - model your own circumstances
- 60% Marginal Rate Escape guide - mitigation strategies
- HICBC calculator - £60k-£80k taper modelling
- £110,000 salary calculator - 62% cliff visualised
- Scottish Income Tax bands 2026/27
Press contact and quotable assertions at salarytax.uk/press.