HENRY Knowledge · Published 22 September 2026

How much pension contribution gets me below £100k?

Start with adjusted net income—not salary—then distinguish the gross pension contribution from the amount that leaves your bank account.

Mark Graham, founder and product editor · General education, not personal advice. AI-assisted content. Submitted for professional review; feedback remains pending and no approval or endorsement is implied. Tax examples concern 2026/27.

The short answer

A useful first estimate is your adjusted net income before the proposed contribution minus £100,000. If that figure is £116,000, the indicative gap is £16,000 gross. It is not automatically the right contribution: other income, existing pension payments, Gift Aid and the way your pension receives tax relief can all change the figure.

HMRC defines adjusted net income as total taxable income before Personal Allowances, less certain reliefs. It includes more than salary—for example taxable employment benefits, savings interest, dividends and rental income. HMRC adjusted net income guidance.

A £116,000 illustration

Suppose your estimated adjusted net income is £116,000 before a new pension payment. The planning gap to £100,000 is £16,000 gross.

• Salary sacrifice: giving up £16,000 of future cash salary in exchange for an employer pension contribution may reduce taxable employment pay by £16,000. It requires an employer agreement and cannot reduce cash earnings below the National Minimum Wage.
• Relief at source: a £12,800 payment from your bank is normally grossed up by basic-rate relief to £16,000. For adjusted net income, HMRC says to deduct the grossed-up amount—not £12,800.
• Net pay arrangement: contributions are normally deducted before income tax through payroll. Use the taxable-pay figure on your records and do not deduct the same contribution twice.

The example isolates contribution mechanics. It does not calculate your complete tax return, Scottish employment-income rates, benefits or pension tax charge.

Why salary alone can give the wrong answer

A £110,000 salary does not necessarily mean a £10,000 gap. A bonus, benefits in kind, bank interest or dividends could make the gap larger. Existing relief-at-source contributions or Gift Aid could make it smaller. Use a full-year estimate and retain the source figures so you can update it when a bonus or benefit changes.

Four checks before acting

1. Confirm which pension method your employer or provider uses and whether the contribution shown is net, gross or salary sacrificed.
2. Include employer contributions and all other pension inputs when checking annual allowance, tapering, carry forward and the Money Purchase Annual Allowance.
3. Check the effect on accessible cash, statutory pay, mortgage affordability and employer benefits before changing salary.
4. Reconcile the estimate after the tax year using payslips, P60/P11D, pension statements and records of other taxable income.

Pension inputs above your available annual allowance can create a tax charge; the standard allowance is not a guarantee that the whole amount is available to you. GOV.UK annual allowance guidance. Salary sacrifice also changes contractual cash pay and can affect earnings-related benefits. HMRC salary sacrifice guidance.