Published by the UK Money Calculators editorial team. Last updated for the 2026/27 tax year.
Pension contributions reduce your adjusted net income (ANI). ANI controls some of the most valuable tax thresholds in the UK. Depending on your income, getting ANI below a key threshold can save far more than the headline tax rate suggests.
| ANI threshold | What changes below this level | Effective saving |
|---|---|---|
| £100,000 | Personal allowance restored in full; 30-hour childcare preserved | Up to 60% |
| £80,000 | High Income Child Benefit Charge eliminated | 40% + HICBC saved |
| £60,000 | HICBC starts to reduce (completely gone below £60k) | 40% + partial HICBC |
| £50,270 | Fully in basic-rate band; personal savings allowance increases from £500 to £1,000 | 40% on excess |
Between £100,000 and £125,140, the personal allowance (£12,570) is withdrawn at 50p per £1 of extra ANI. The effective marginal tax rate is 60%, not 40%. Each £2 extra ANI costs 40p tax on that £2, plus 40p tax on the £1 of allowance lost.
Take ANI of £105,000. The personal allowance is reduced by £2,500 (£5,000 excess × 50%). A £5,000 gross pension contribution reduces ANI to £100,000 and restores the full allowance. Tax saving: 60% × £5,000 = £3,000. Net cost of the £5,000 contribution: just £2,000. The pension contribution pays for 60% of itself.
The High Income Child Benefit Charge (HICBC) claws back child benefit when the highest earner in the household has ANI above £60,000. The rate: 1% of benefit per £200 of ANI above £60,000. Full clawback at £80,000.
Child benefit rates 2026/27: approx £1,331/year for the first child, £881/year for each additional child. For two children that is ~£2,212/year. A contribution that drops ANI from £65,000 to below £60,000 saves the full HICBC on top of 40% income tax relief. For two children, that is potentially £2,212 + ~£1,200 (40% relief on £3,000) = £3,400+ in total annual benefit from a £3,000 contribution.
Both partners must have ANI below £100,000 to access 30 hours free childcare for 3–4 year olds. Exceed £100,000 by £1 and the extra 15 hours are gone entirely. That cliff is worth £5,000–£12,000/year depending on local childcare costs. A pension contribution to bring ANI below £100,000 is potentially the highest-return financial decision available.
Yes, but via a different route. Salary sacrifice reduces contractual pay before it is counted as income, so the sacrificed amount never enters ANI. The effect on all ANI-related thresholds is the same as a gross relief-at-source contribution of equivalent size.
Yes. Under relief at source, contributions made up to 5 April are counted in the 2026/27 tax year. Under salary sacrifice, the timing of contributions is determined by when salary is reduced. Planning a large contribution in the tax year you are in the relevant ANI band maximises the threshold benefit.
Yes, dividends above the dividend allowance (£500 for 2026/27) count toward ANI. This is why company directors drawing dividends can unexpectedly find themselves in HICBC or PA-taper territory, their salary alone may be below the threshold but dividends push ANI above it.
Disclaimer: General information only, not financial or tax advice. Individual circumstances vary significantly. Consult a qualified adviser.