Salary Sacrifice Pension Calculator

Salary sacrifice is an agreement with your employer to give up part of your salary in exchange for a non-cash benefit — most commonly pension contributions. The sacrificed amount is paid directly into your pension before income tax and National Insurance are assessed, so you save both. It is not the same as a personal pension contribution, where you pay from net income and claim tax relief separately.

Between £100,000 and £125,140, the personal allowance is gradually withdrawn — £1 for every £2 of income above £100,000. This means each £2 of income in this range loses £1 of personal allowance, which was sheltering income from 40% tax. The combined effect is 40% higher-rate tax plus an effective 20% extra (the lost allowance × basic rate) = 60%. Salary sacrifice reduces adjusted net income, which is what HMRC uses to calculate the taper, allowing you to restore your personal allowance.

Yes, but only if your fee-payer (agency or end client) operates the arrangement. Inside IR35, your income is processed through their payroll as a deemed employee. If they offer salary sacrifice, it works identically to PAYE — the sacrifice reduces deemed salary before income tax and NI. Most agencies do not offer this, so in practice many inside-IR35 contractors cannot access salary sacrifice directly.

Yes, and for Ltd company directors this is often more tax-efficient than salary sacrifice. Employer pension contributions are a deductible business expense — they reduce taxable profits before corporation tax. There is no employer NI or employee NI on these contributions. A £10,000 employer contribution saves £1,900 in corporation tax (at 19%) in addition to the income tax and NI that would have applied if the money were taken as salary or dividends.

The standard annual allowance is £60,000 (or 100% of your UK earnings, whichever is lower). This covers all pension contributions — employee and employer combined. If you have flexibly accessed a pension (for example, drawn from drawdown), the money purchase annual allowance (MPAA) reduces this to £10,000. Unused allowances from the previous three tax years can be carried forward.

Adjusted net income is your gross income minus certain deductions including pension contributions made via salary sacrifice and Gift Aid donations. HMRC uses adjusted net income — not gross income — to calculate the personal allowance taper, child benefit tax charge, and eligibility for certain tax reliefs. This is why salary sacrifice is so powerful at incomes near £100,000: it can reduce adjusted net income below the taper threshold and restore the full personal allowance.

It can. Mortgage lenders typically assess affordability based on your contractual salary, which is reduced by salary sacrifice. Some lenders add the sacrificed amount back when calculating borrowing capacity; others do not. If you are planning a mortgage application, check with your lender before increasing your salary sacrifice. You can also temporarily reduce or pause sacrifice before applying.

Yes. If you have not used your full annual allowance in the past three tax years, you can carry the unused amount forward and contribute more this year. This is particularly useful for contractors with variable income — if you had a lean year and under-contributed, you can make a larger contribution in a better year. You must have been a member of a registered pension scheme in the years you are carrying forward from.