Why is the £100,000 to £125,140 band the worst marginal rate in the UK?

Every additional £1 earned in that band is taxed at the 40% higher rate, AND it removes 50p of Personal Allowance, which is itself taxed at 40%. So each marginal £1 costs you 40p + 20p = 60p in Income Tax, plus 2% Class 1 NI on top: an effective 62% marginal rate. Above £125,140 the Personal Allowance has been fully tapered away, so the marginal rate drops to 45% additional rate plus 2% NI = 47%. The taper band is structurally the highest marginal rate in the UK system, higher than the headline additional rate itself.

Is earning £150k really more tax-efficient than £120k per marginal pound?

Per marginal pound, yes. The pound earned at £150k is taxed at 47% (45% income tax + 2% NI), versus 62% for the same pound earned at £120k. The total tax paid on £150k of income is of course higher than on £120k - this is about marginal rate, not total. The practical implication: if a high earner has a choice between a pay rise that pushes them deeper into the taper versus one that clears it entirely (e.g. £100k to £130k versus £100k to £180k), the latter has a lower blended effective rate on the increment.

How much can I contribute to a pension if I earn over £100k?

The standard pension annual allowance is £60,000 for 2026/27 combined employer + employee contributions across all schemes. Tapered annual allowance kicks in once adjusted income exceeds £260,000 (with threshold income above £200,000) - the allowance reduces by £1 for every £2 of adjusted income above £260,000, down to a minimum of £10,000. Three-year carry-forward of unused allowance from 2023/24, 2024/25 and 2025/26 is also available, provided you were a member of a registered pension scheme in each carry-forward year.

Does Gift Aid actually reduce adjusted net income for the £100k taper?

Yes. The gross Gift Aid donation (cash given x 1.25) is deducted from adjusted net income for both the £100,000 Personal Allowance taper and the High Income Child Benefit Charge calculation. So a £4,000 cash donation grosses up to £5,000 and reduces ANI by £5,000. The donor also reclaims higher-rate / additional-rate relief on the gross figure through Self Assessment, so a £4,000 cash donation costs an additional-rate taxpayer £2,750 net of all reliefs while reducing the taper exposure by £5,000.

Do I lose Tax-Free Childcare immediately at £100k?

Yes - the £100,000 adjusted-net-income threshold for Tax-Free Childcare and 30 hours free childcare is a cliff edge, not a taper. The moment either parent exceeds £100,000 ANI, eligibility is lost for the whole household until ANI falls back below the threshold (verified at quarterly reconfirmation). For parents of pre-school children, the loss can be £2,000 per child for Tax-Free Childcare plus several thousand more for the 30 hours, on top of the 62% taper - which is why salary sacrifice to keep ANI just under £100k is the dominant high-earner move for parents.

Should higher earners use ISAs, EIS or VCTs?

ISAs first - the £20,000 annual allowance shelters interest, dividends and capital gains entirely outside tax for life, and ISA balances do not appear on Self Assessment. For additional-rate taxpayers the dividend allowance is £500 and the rate above it is 39.35%, so sheltering dividend-paying assets in an ISA saves the full 39.35% on yield. EIS (30% Income Tax relief on up to £1m of qualifying investment, CGT-free after three years) and VCT (30% Income Tax relief on up to £200k, tax-free dividends, CGT-free) are useful only after pension and ISA allowances are fully used, and only for investors comfortable with high-risk early-stage equity. SEIS (50% relief, lower limits) is even higher risk. None of this is a recommendation - the risk profile is materially higher than pensions or ISAs.

How does spouse-income shifting work and is it allowed?

Transferring income-producing assets (cash savings, equities, rental property held as a couple) to the lower-earning spouse is a standard and HMRC-accepted strategy, provided the transfer is a genuine gift with no strings attached. The transferring spouse no longer owns the asset; the receiving spouse pays tax on its income at their marginal rate. For a couple where one earns £150k (47% marginal on additional dividends) and the other earns nothing, shifting a £50k dividend-paying portfolio to the lower-earning spouse can move the dividend income from 39.35% to 8.75% (or zero, after Personal Allowance and Dividend Allowance) - a saving of 30p+ on every pound of dividend yield. Jointly-held investments default to 50/50 income split unless a Form 17 election is filed.

UK High Earner Tax Planning Checklist (2026/27)

The UK income tax curve produces a 62% effective marginal rate in the £100,000 to £125,140 Personal Allowance taper band, then drops to 47% above £125,140. Counter- intuitively, earning £150,000 can be more tax-efficient per marginal pound than earning £120,000 - the band between £100k and £125,140 is the single most expensive slice of income in the entire UK system. This page covers the eight-move playbook for UK earners hitting the £100k zone in 2026/27.

Every rate, threshold and worked-example figure below is the 2026/27 statutory amount, verifiable against the gov.uk sources cited in the schema. None of this is personalised tax advice - circumstances vary, and high-earner planning typically benefits from a regulated adviser before significant decisions.

The shape of the £100k+ tax curve

For 2026/27 the relevant marginal rates for high earners are:

£50,270 - £100,000: 40% higher rate + 2% NI = 42% marginal.
£100,000 - £125,140: 40% on the pound + 40% on the 50p of Personal Allowance withdrawn + 2% NI = 62% marginal.
£125,140+: 45% additional rate + 2% NI = 47% marginal.

Computed from the salary engine: a £100,000 earner takes home £68,557 a year. A £125,000 earner takes home £78,057 - only £9,500 more for £25,000 of additional gross, an effective marginal rate of 62.0% across the taper band. A £150,000 earner takes home £91,286: the £25,000 increment from £125,000 to £150,000 adds £13,229, an effective marginal of 47.1%. The £100k to £125k slice is structurally worse than the £125k to £150k slice. See the 60% tax trap explainer and extended £100k tax trap worked examples for the full PA-taper arithmetic.

1. Pension sacrifice to keep adjusted net income below £100,000

Benefit: Reclaims the full £12,570 Personal Allowance, dodges the 62% marginal rate on the sacrificed pounds, and routes them into your pension pot tax-free at source. For a £105,000-£125,140 earner this is almost always the single highest- return action available - the effective return on the sacrificed pound is the 62p of avoided tax + NI plus the future investment growth in the pension.

How to action it: Use workplace salary sacrifice if offered (most employers above ~£100k headcount provide it), otherwise relief-at-source via a SIPP. Both reduce adjusted net income for the £100k taper, but sacrifice also saves the 2% employee NI on the sacrificed amount - typically several hundred pounds extra per year over RAS. The pension contribution calculator models the gross-to-net effect; see also the 60% tax trap explainer for the full taper mechanics.

2. Bonus sacrifice - never let it become taxable income

Benefit: Bonuses are taxed as employment income and count toward the £100,000 line. A £20,000 bonus landing on top of a £105,000 salary is taxed entirely inside the taper band at 62% marginal. Sacrificing the bonus into pension before payment means the bonus never enters taxable income at all - the full 62% is saved on every sacrificed pound.

How to action it: Most employers running salary sacrifice will accept a bonus-sacrifice election made before the bonus is paid (the timing rule is the contractual sacrifice must pre-date the right to receive the cash, otherwise HMRC treats the bonus as earned and sacrifice fails). Some schemes offer a one-shot annual election window; others allow ad-hoc elections per bonus. The bonus tax calculator shows the cash-vs-sacrifice trade-off with full PA-taper modelling.

3. Carry-forward pension annual allowance from up to 3 prior years

Benefit: If a one-off event such as a sale, IPO, large bonus or post-sacrifice adjusted income drop pushes you into a year where you can afford to over-contribute, carry-forward lets you stack unused annual allowance from the three previous tax years (2023/24, 2024/25, 2025/26 for 2026/27) on top of the current year's £60,000. In principle that allows up to £200,000 of pension contribution in a single year, subject to having earned enough relevant UK earnings to qualify.

How to action it: Carry-forward only works if you were a member of a UK registered pension scheme in each carry- forward year (even £1 of contribution counts). The current-year £60,000 must be used first, then prior years in order, oldest first. The tapered annual allowance reduces the allowance for adjusted-income years above £260,000 - useful where post-sacrifice adjusted income drops back below £260,000 and the full £60,000 is restored. See the pension annual allowance calculator for carry-forward sequencing and the taper interaction.

4. Use the full £20,000 ISA allowance every year

Benefit: The ISA wrapper shelters interest, dividends and capital gains entirely outside Income Tax, Dividend Tax and Capital Gains Tax - for life. For additional-rate taxpayers the dividend rate above the £500 Dividend Allowance is 39.35% and the CGT rate is 24% on shares - so sheltering yield-producing or growth assets in an ISA can save 30p+ per pound of return compared to a general investment account.

How to action it: £20,000 per UK resident adult, per tax year, split however you choose across Cash, Stocks and Shares, Innovative Finance and Lifetime ISA (with £4,000 sub-limit on the LISA, only available to those under 40 at first contribution). For couples that is £40,000 a year of sheltered contribution. Allowance does not carry forward. See the ISA allowance £20k explainer.

5. Time CGT disposals to use the £3,000 annual exempt amount

Benefit: Capital gains realised inside the £3,000 annual exempt amount are entirely free of CGT; above it, shares are taxed at 18% (basic-rate band) or 24% (higher / additional rate). Realising gains piecemeal across multiple tax years can shelter tens of thousands of pounds of gain over time at zero tax. The AEA is per person per year and does not carry forward.

How to action it: The standard year-end move is "bed and ISA" - sell a holding in a general investment account to crystallise a gain inside the £3,000 AEA, then immediately repurchase the same holding inside an ISA. This resets the cost basis upward (sheltering future growth from CGT) and uses the otherwise wasted £3,000 allowance. The 30-day same-share repurchase "bed and breakfasting" rule does not bite because the repurchase is in a different wrapper. See the UK Capital Gains Tax calculator.

6. Gift Aid donations and the adjusted-net-income reduction

Benefit: Gift Aid donations are grossed up by 25% (the charity reclaims 20% basic-rate tax). Higher-rate and additional-rate taxpayers reclaim the difference between their marginal rate and basic rate via Self Assessment - so a £1,000 cash donation costs an additional-rate taxpayer £687.50 net of reliefs. Crucially, the gross donation (cash x 1.25) reduces adjusted net income for both the £100,000 Personal Allowance taper and the High Income Child Benefit Charge.

How to action it: Tick the Gift Aid box at the charity, then declare donations on the Self Assessment return. The Gift Aid carry-back election (made on SA) lets you treat a donation made between 6 April and the SA filing date as if made in the previous tax year - the standard year-end move when a 5 April donation deadline was missed but SA has not yet been filed. For high earners, charitable strategy is often built around the ANI number: time gifts in the year you would otherwise be in the taper, then bunch in the next year if circumstances change.

7. EIS, VCT and SEIS for high-risk capital - last, not first

Benefit: The Enterprise Investment Scheme offers 30% Income Tax relief on up to £1,000,000 of qualifying investment per tax year, with gains tax-free after three years and CGT deferral on reinvested gains. Venture Capital Trusts offer 30% relief on up to £200,000, plus tax-free dividends and tax-free capital gains on disposal. Seed EIS offers 50% relief on up to £200,000 of qualifying investment in very early-stage companies. For an additional-rate taxpayer using EIS in a year of large gains, the combined Income Tax relief plus CGT deferral plus exit-free gain can produce returns even on a flat or modestly-down investment.

How to action it: These are FCA-regulated investments in unlisted early-stage equity - illiquid, high-risk and with material chance of total loss of capital. The Income Tax relief is not a substitute for the underlying investment thesis. Use only after pension and ISA allowances are fully consumed, and only for capital you can afford to lose. Specialist regulated advice is the norm here, not the exception. (No on-site calculator for these because the relief mechanics depend on the qualifying status of the underlying company - which is verified by HMRC, not arithmetically.)

8. Spouse-income shifting and joint asset structuring

Benefit: Transferring income-producing assets (cash savings, dividend-paying equities, rental property) to a lower- earning spouse moves the income from the high earner's marginal rate to the spouse's. For a couple where one is in the 47% additional-rate band (or worse, the 62% taper) and the other has unused Personal Allowance + basic-rate band, the saving on every pound of yield can be 30-50p. Dividend income at the spouse's rate may be 8.75% versus 39.35% at the high earner's rate; savings interest may sit inside the £1,000 Personal Savings Allowance and be tax-free entirely. Couples also get a combined £40,000 of ISA allowance and two £3,000 CGT AEAs per year.

How to action it: Outright transfers between spouses / civil partners are exempt from CGT (the no-gain / no-loss rule) and free of stamp duty for non-property assets. Jointly held investments default to a 50/50 income split for tax purposes regardless of beneficial ownership, unless a Form 17 election is filed with HMRC declaring the actual ownership ratio (which must then match the underlying legal title). Transfers must be genuine gifts with no strings attached - retention of beneficial interest means HMRC will continue to attribute the income to the transferor.

Worked example: £125k earner sacrifices £25k into pension

The single most common high-earner move is sacrificing enough salary into pension to bring adjusted net income back to £100,000, restoring the full Personal Allowance. The arithmetic for a £125,000 gross earner in 2026/27 (England rest-of-UK bands, no student loan, computed by the on-site salary engine):

Before sacrifice - £125,000 gross, take-home £78,057 a year (£6,505 a month). Income Tax £42,432, NI £4,511.
After sacrificing £25,000 into pension - effective taxable salary £100,000, take-home £68,557 a year (£5,713 a month). Income Tax £27,432, NI £4,011, plus £25,000 added to pension.
Take-home difference - £9,500 less in the bank account.
Tax + NI saved on the £25,000 sacrifice - £15,500. The sacrificed £25,000 lands in pension for a net-pay cost of only £9,500.
Combined economic position after sacrifice - take-home £68,557 + £25,000 in pension = £93,557, vs £78,057 take-home with no pension. The sacrifice strategy is £15,500 better off in total economic value - the entire avoided 62% marginal converted into pension wealth instead.

The headline number: roughly £10k less in take-home, but £25,000 in pension, for a net wealth gain of about £16k versus doing nothing. The pension money is illiquid until age 57 (rising to 58 in 2028), so this is a retirement-saving move, not a cash-flow move - but for any earner already contributing toward a long-term retirement target, routing the marginal taper-band income into pension is structurally the best-return use of the pound.

CGT and dividend interaction for additional-rate earners

Above £125,140 the 39.35% additional-rate dividend rate applies to dividends above the £500 Dividend Allowance, and the 24% higher-rate CGT applies to share disposals above the £3,000 AEA. For a high earner with a non-trivial investment portfolio outside tax wrappers the annual leakage adds up fast: a £20,000 dividend yield from a general investment account costs roughly £7,672 in Dividend Tax at additional rate, versus zero inside an ISA. A £20,000 capital gain disposed of in a single year costs about £4,080 of CGT (£17,000 above the £3,000 AEA at 24%), versus zero inside an ISA.

Two structural moves dominate: (a) shift dividend-yielding and growth assets to the lower-earning spouse via outright gift or Form 17 election, so that yield and gains pay tax at the spouse's marginal rate or sit inside their unused allowances; (b) use both spouses' annual ISA allowances (combined £40,000) and CGT AEAs (combined £6,000) every single year - the wrappers do most of the tax shelter work, not bespoke planning.

The childcare cliff at £100,000 - especially harsh for parents

Tax-Free Childcare (worth up to £2,000 per child per year) and the 30 hours of free childcare for 3 and 4 year-olds are both withdrawn entirely the moment either parent's adjusted net income exceeds £100,000. There is no taper - it is a cliff edge. For a family with two pre-school children, the loss is up to £4,000 of Tax-Free Childcare alone plus several thousand more in the 30 hours equivalent value, on top of the 62% taper-band marginal rate on the earned pounds.

The effective marginal cost of crossing £100,000 for a parent of two pre-school children, where the family would otherwise claim both childcare benefits, can exceed 100% on the first few thousand pounds above the threshold. Pension sacrifice to keep ANI below £100k is the dominant move for high-earning parents - the value of the retained childcare benefits often exceeds the value of the avoided Income Tax taper on its own. Eligibility for both benefits is verified quarterly via the government Childcare Service account, using projected ANI for the next quarter - so a one-off bonus pushing ANI above £100k for a single quarter loses childcare eligibility for that whole window even if annualised income is below the threshold.

Frequently asked questions

Why is the £100,000 to £125,140 band the worst marginal rate in the UK?: Every additional £1 earned in that band is taxed at the 40% higher rate, AND it removes 50p of Personal Allowance, which is itself taxed at 40%. So each marginal £1 costs you 40p + 20p = 60p in Income Tax, plus 2% Class 1 NI on top: an effective 62% marginal rate. Above £125,140 the Personal Allowance has been fully tapered away, so the marginal rate drops to 45% additional rate plus 2% NI = 47%. The taper band is structurally the highest marginal rate in the UK system, higher than the headline additional rate itself.
Is earning £150k really more tax-efficient than £120k per marginal pound?: Per marginal pound, yes. The pound earned at £150k is taxed at 47% (45% income tax + 2% NI), versus 62% for the same pound earned at £120k. The total tax paid on £150k of income is of course higher than on £120k - this is about marginal rate, not total. The practical implication: if a high earner has a choice between a pay rise that pushes them deeper into the taper versus one that clears it entirely (e.g. £100k to £130k versus £100k to £180k), the latter has a lower blended effective rate on the increment.
How much can I contribute to a pension if I earn over £100k?: The standard pension annual allowance is £60,000 for 2026/27 combined employer + employee contributions across all schemes. Tapered annual allowance kicks in once adjusted income exceeds £260,000 (with threshold income above £200,000) - the allowance reduces by £1 for every £2 of adjusted income above £260,000, down to a minimum of £10,000. Three-year carry-forward of unused allowance from 2023/24, 2024/25 and 2025/26 is also available, provided you were a member of a registered pension scheme in each carry-forward year.
Does Gift Aid actually reduce adjusted net income for the £100k taper?: Yes. The gross Gift Aid donation (cash given x 1.25) is deducted from adjusted net income for both the £100,000 Personal Allowance taper and the High Income Child Benefit Charge calculation. So a £4,000 cash donation grosses up to £5,000 and reduces ANI by £5,000. The donor also reclaims higher-rate / additional-rate relief on the gross figure through Self Assessment, so a £4,000 cash donation costs an additional-rate taxpayer £2,750 net of all reliefs while reducing the taper exposure by £5,000.
Do I lose Tax-Free Childcare immediately at £100k?: Yes - the £100,000 adjusted-net-income threshold for Tax-Free Childcare and 30 hours free childcare is a cliff edge, not a taper. The moment either parent exceeds £100,000 ANI, eligibility is lost for the whole household until ANI falls back below the threshold (verified at quarterly reconfirmation). For parents of pre-school children, the loss can be £2,000 per child for Tax-Free Childcare plus several thousand more for the 30 hours, on top of the 62% taper - which is why salary sacrifice to keep ANI just under £100k is the dominant high-earner move for parents.
Should higher earners use ISAs, EIS or VCTs?: ISAs first - the £20,000 annual allowance shelters interest, dividends and capital gains entirely outside tax for life, and ISA balances do not appear on Self Assessment. For additional-rate taxpayers the dividend allowance is £500 and the rate above it is 39.35%, so sheltering dividend-paying assets in an ISA saves the full 39.35% on yield. EIS (30% Income Tax relief on up to £1m of qualifying investment, CGT-free after three years) and VCT (30% Income Tax relief on up to £200k, tax-free dividends, CGT-free) are useful only after pension and ISA allowances are fully used, and only for investors comfortable with high-risk early-stage equity. SEIS (50% relief, lower limits) is even higher risk. None of this is a recommendation - the risk profile is materially higher than pensions or ISAs.
How does spouse-income shifting work and is it allowed?: Transferring income-producing assets (cash savings, equities, rental property held as a couple) to the lower-earning spouse is a standard and HMRC-accepted strategy, provided the transfer is a genuine gift with no strings attached. The transferring spouse no longer owns the asset; the receiving spouse pays tax on its income at their marginal rate. For a couple where one earns £150k (47% marginal on additional dividends) and the other earns nothing, shifting a £50k dividend-paying portfolio to the lower-earning spouse can move the dividend income from 39.35% to 8.75% (or zero, after Personal Allowance and Dividend Allowance) - a saving of 30p+ on every pound of dividend yield. Jointly-held investments default to 50/50 income split unless a Form 17 election is filed.