calculatetax.co.uk
Tax year: 2025/26 & 2026/27 Jurisdiction: UK, with Scotland tax option Last verified: May 9 2026

Pension Contribution Tax Relief Calculator

Work out what a pension contribution really costs after tax relief. Compare relief at source, net pay, salary sacrifice and employer contributions, including higher-rate claims, Scottish tax bands, National Insurance saving, Personal Allowance restoration and annual allowance warnings.

Estimate pension tax relief

Enter the gross amount you want in the pension. For relief at source, this is the amount after the provider top-up.

Choose the method your workplace or pension provider actually uses.

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£
£

Include employer contributions and defined-contribution pension input already made.

%

Only affects salary sacrifice estimates.

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£

Relief at source

80% paid

A GBP 80 net payment normally becomes GBP 100 in the pension.

Annual allowance

GBP 60k

The standard pension input limit before an annual allowance tax charge.

High earners

GBP 260k

Adjusted income above this can taper the annual allowance if threshold income is over GBP 200k.

Which pension relief method are you really using?

Pension tax relief is generous, but it is also easy to misunderstand because the same GBP 5,000 pension contribution can behave differently depending on how it reaches the pension. A personal pension usually uses relief at source. Many occupational schemes use net pay. Some employers offer salary sacrifice, which is not a normal employee contribution at all: you give up salary and the employer pays into the pension instead.

This matters in real life. If you pay into a relief at source pension and have just drifted into higher-rate tax, perhaps because London pay rose while tax thresholds stayed frozen, your provider may only add basic-rate relief. You may need to claim the rest. If you use salary sacrifice, the saving can include National Insurance, but it can also affect salary-linked benefits, statutory pay and minimum wage checks.

The calculator shows the tax relief, estimated reclaim, employee NI saving, employer NI top-up if shared, and annual allowance position separately. That is more useful than one headline percentage because the next action depends on the method.

Method What usually happens
Relief at sourceProvider adds 20%; higher relief may need claiming.
Net payContribution reduces taxable pay before Income Tax.
Salary sacrificeSalary falls; employer pension contribution rises.
Employer contributionNo employee take-home cost, but it uses annual allowance.

How this pension tax relief calculator works

Inputs used

  • Tax year, region, income, contribution method and gross pension contribution.
  • Existing pension input for the same tax year, including employer contributions where known.
  • Salary sacrifice employer NI sharing percentage, if your employer adds some of its saving to your pension.
  • Threshold income, adjusted income and Money Purchase Annual Allowance flag for annual allowance warnings.

Calculation method

  • Calculate Income Tax before the contribution using the selected UK or Scottish bands and Personal Allowance taper.
  • For relief at source, treat the user payment as 80% of the gross contribution, add the provider top-up, and estimate any extra tax relief by comparing tax before and after a gross contribution deduction.
  • For net pay, estimate the Income Tax saving from reducing taxable pay by the gross contribution.
  • For salary sacrifice, estimate Income Tax and employee National Insurance saving from reducing salary by the sacrificed amount, then add any employer NI saving shared into the pension.
  • Check the standard, tapered or money purchase annual allowance position and flag potential excess pension input.

Assumptions

  • The calculation assumes the contribution is eligible for UK pension tax relief and paid to a registered pension scheme.
  • Relief at source estimates the provider basic-rate top-up at 20% of the gross contribution. A Scottish 19% starter-rate taxpayer does not have to repay the 1% difference under GOV.UK guidance.
  • Salary sacrifice is estimated under 2025/26 and 2026/27 rules. The announced April 2029 National Insurance cap is noted but not applied to these tax years.
  • The annual allowance warning is simplified for defined-contribution input. Defined-benefit pension input amounts can be very different from cash contributions.

What this does not cover

  • It does not calculate carry forward from the previous 3 tax years. Use HMRC guidance or pension statements if you are near the annual allowance.
  • It does not calculate defined-benefit pension input amounts, overseas pension relief, lifetime allowance transitional protections, lump sum allowance issues, or pension recycling rules.
  • It does not calculate your full payslip, student loan deductions or complete take-home pay. Use the Take-Home Pay Calculator and Student Loan Repayment Calculator for those checks.
  • It does not calculate the High Income Child Benefit Charge itself. If pension contributions bring adjusted net income near GBP 60,000, use the High-Income Child Benefit Charge Calculator.

Worked example: relief at source at higher rate

Say you earn GBP 60,000 and want GBP 5,000 added to a personal pension. Under relief at source, you normally pay GBP 4,000 from your bank account and the provider claims GBP 1,000 from HMRC. That gives you a GBP 5,000 gross pension contribution.

Because some of your income is taxed above 20%, you may also be able to claim extra relief. The exact amount depends on how much of the contribution falls into higher-rate or Scottish intermediate/higher bands after Personal Allowance and other income are considered.

The important bit is practical: check whether your pension is relief at source. If it is, and you pay tax above 20%, do not assume the provider has claimed everything. It usually has not.

Salary sacrifice checks before you increase it

Salary sacrifice can be the neatest route because it usually saves Income Tax and employee National Insurance. Some employers also add part of their employer NI saving to your pension, which can make the pension boost larger than the salary you give up.

It is not always harmless. GOV.UK warns salary sacrifice must not take pay below National Minimum Wage and can affect statutory payments or contribution-based benefits. If you are close to maternity pay, sick pay, mortgage affordability or visa income checks, pause before sacrificing a large amount.

There is also a future change: from April 2029, the National Insurance exemption for employee pension salary sacrifice is due to be capped at GBP 2,000 a year. That does not change this 2025/26 and 2026/27 estimate, but it is worth knowing if you are planning several years ahead.

Common pension relief mistakes

Confusing net payment with gross contribution

In relief at source, GBP 4,000 paid by you usually becomes GBP 5,000 in the pension. The calculator asks for the gross amount.

Not claiming higher-rate relief

Relief at source providers add basic-rate relief. Higher, additional and Scottish top-up relief often needs a claim.

Ignoring adjusted net income

Pension contributions can restore Personal Allowance above GBP 100,000 or reduce Child Benefit charge exposure above GBP 60,000.

Forgetting employer contributions

Employer contributions count towards annual allowance even though they do not feel like money leaving your bank account.

Pension tax relief FAQs

Why does my pension provider add 25%?
In a relief at source pension, you pay the net amount and the provider claims basic-rate tax relief from HMRC. Paying GBP 80 normally becomes GBP 100 in the pension, so the top-up looks like 25% of what you paid even though it represents 20% of the gross contribution.
How do higher-rate taxpayers claim extra pension relief?
If your pension uses relief at source and you pay tax above 20%, you usually claim the extra relief through Self Assessment or by contacting HMRC. The provider only adds the basic-rate relief.
Does salary sacrifice save National Insurance?
Under current 2025/26 and 2026/27 rules, a valid pension salary sacrifice normally reduces employee and employer National Insurance because the sacrificed pay is replaced by an employer pension contribution. A future change from April 2029 will cap the NI exemption for employee sacrifice at GBP 2,000 a year.
Can pension contributions reduce the Child Benefit charge?
They can. Pension contributions can reduce adjusted net income, which is the income measure used for the High Income Child Benefit Charge. The exact effect depends on contribution type and household income.
Is the annual allowance the same as tax relief?
No. Tax relief is the income tax benefit on eligible pension contributions. The annual allowance is the amount of pension saving you can usually build up in a tax year before an annual allowance tax charge may apply.

Official sources

Last verified: May 9 2026. Calculations are estimates based on the published rules and assumptions shown on this page.

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