A pension net pay arrangement takes your pension contribution out of your gross salary before your employer calculates income tax, so you get tax relief at your full marginal rate automatically on every payday. There is no separate claim to HMRC, no self-assessment step for higher-rate relief, and nothing you need to do to trigger it. The relief is built into the payroll calculation.
How the Deduction Works on Your Payslip
Section 193 of the Finance Act 2004 gives your employer the authority to subtract your pension contribution from gross pay before applying your tax code.1Legislation.gov.uk. Finance Act 2004 – Section 193 Your employer works out your total earnings for the period, removes the pension contribution, and then applies your tax code to the smaller figure. You only pay income tax on what remains.
Because relief comes off the top of your gross pay, it lands at whatever rate you actually pay. A basic-rate taxpayer putting £100 into a pension gives up only £80 of take-home pay. A higher-rate taxpayer contributing the same £100 gives up £60. An additional-rate taxpayer gives up even less. All of that happens in payroll. You do not file anything, and the statute blocks any further claim for relief on the same contribution under any other part of the Income Tax Acts.1Legislation.gov.uk. Finance Act 2004 – Section 193
Net Pay Compared to Relief at Source
The other common method is relief at source, set out in Section 192 of the Finance Act 2004.2Legislation.gov.uk. Finance Act 2004 – Section 192 Under that method the contribution comes out of your pay after tax has already been deducted. You hand over 80% of the contribution from your net pay and your pension provider claims the remaining 20% back from HMRC at the basic rate. A £100 contribution costs you £80 in cash and the provider tops it up.
For a basic-rate taxpayer the two methods produce the same outcome: £100 in the pension for £80 out of pocket. The gap opens up at the ends of the income scale.
Higher-rate and additional-rate taxpayers in a relief at source scheme only get the 20% top-up automatically. To capture the rest, they have to file a self-assessment return or contact HMRC directly. If they forget, the extra relief is lost. Net pay removes that risk because the whole contribution is stripped out before tax is calculated, so the higher-rate saving is captured on the payslip itself.1Legislation.gov.uk. Finance Act 2004 – Section 193
The reverse problem hits people at the bottom of the income scale. Relief at source pays a 20% top-up regardless of whether the individual pays any tax, because the provider claims it from HMRC either way. Net pay works by reducing taxable income, so if your income is already below the personal allowance there is nothing to reduce and no relief lands. The government has since built a fix for that, described further down.3GOV.UK. Relief Relating to Net Pay Arrangements
What Net Pay Does Not Do for National Insurance
Net pay reduces your income tax bill. It does not reduce your National Insurance. HMRC’s guidance is explicit that NI contributions must be assessed on gross earnings before any pension deduction, whether or not a net pay arrangement is in place.4HM Revenue & Customs. National Insurance Manual – NIM02365
The practical effect is that your NI record stays intact regardless of how much you put into the pension, which protects your State Pension entitlement, but you get no NI saving from contributing. If you want an NI saving as well as a tax saving, that requires a salary sacrifice arrangement rather than net pay. Under salary sacrifice you contractually give up a portion of your cash salary, so both income tax and NI are calculated on the lower figure. The trade-off is that lower NI-liable earnings can reduce entitlement to earnings-related benefits such as Maternity Allowance, statutory sick pay, and the State Pension, particularly if the reduced pay drops below the lower earnings limit.5GOV.UK. Salary Sacrifice and the Effects on PAYE
Top-Up Payments for Low Earners
If your earnings sit below the personal allowance of £12,570, you historically got nothing from a net pay arrangement, while a colleague in an identical job on a relief at source scheme still received the 20% top-up.6GOV.UK. Income Tax Rates and Personal Allowances The Finance (No.2) Act 2023 inserted a new Section 193A into the Finance Act 2004 to close that gap through a direct top-up payment.7Legislation.gov.uk. Finance (No 2) Act 2023 – Part 1 – Pensions The rule took effect on 6 April 2024, so it applies from the 2024-25 tax year onward.3GOV.UK. Relief Relating to Net Pay Arrangements
HMRC identifies eligible workers using payroll data reported through PAYE and Real Time Information. If your net pay contributions produced no tax relief because your income was below the personal allowance, HMRC calculates a 20% top-up and pays it into your bank account after the tax year ends.3GOV.UK. Relief Relating to Net Pay Arrangements You do not apply. The payment is intended to put you on the same footing as someone in a relief at source scheme.
Checking Your Payslip Is Applying It Correctly
Your payslip is the fastest confirmation that net pay is working. Under a net pay arrangement, the pension contribution appears as a deduction from gross pay, and the “taxable pay” figure will be lower than gross pay by exactly the contribution amount.8HM Revenue & Customs. Pensions Tax Manual – PTM044230
Do a quick check. Take your gross pay, subtract the pension contribution, and see whether the result matches the taxable pay figure. If it does, the arrangement is running correctly. If taxable pay equals gross pay despite a pension deduction showing, the scheme may actually be using relief at source, or there is a payroll error worth raising with your employer.
Your P60 provides the annual version of the same check. It shows total pay after pension deductions under net pay, so comparing it against your expected gross minus contributions confirms the relief carried across the full tax year. If you are unsure which method your scheme uses, the enrolment pack or benefits summary from when you joined normally states it, and your pension administrator or HR team can confirm.
Changing Your Contribution Amount
To increase or decrease your contribution, send a request to your employer’s payroll or HR team. Most employers have a monthly cut-off, often ten to fifteen working days before payday, after which changes carry over to the following month. Once processed, your new deduction should appear on the next payslip along with a revised taxable pay figure. Check both.
You do not need to notify HMRC about the change. Because relief happens through the payroll calculation, a larger contribution automatically reduces your taxable pay further, and a smaller one increases it. The tax relief scales itself every pay period.
The Limits That Cap Your Relief
Tax relief through net pay is not unlimited. For the 2026-27 tax year, the annual allowance for pension savings across all your schemes, including employer contributions, is £60,000.9GOV.UK. Pension Schemes Rates Contributions above that trigger a tax charge at your marginal rate, which effectively cancels the relief on the excess.
High earners face a tapered allowance. If your adjusted income exceeds £260,000, the £60,000 is reduced by £1 for every £2 above that threshold, down to a minimum of £10,000. Tapering only bites if your threshold income also exceeds £200,000.9GOV.UK. Pension Schemes Rates
A separate limit applies if you have already accessed a pension flexibly. The money purchase annual allowance for 2026-27 is £10,000 and cannot be increased through carry forward.9GOV.UK. Pension Schemes Rates
Carrying Forward Unused Allowance
If you did not use your full annual allowance in previous years, you can carry the unused portion forward for up to three tax years, using the oldest year first.10GOV.UK. Check if You Have Unused Annual Allowances on Your Pension Savings This matters if a bonus or a one-off contribution pushes you above the current year’s £60,000, but it only works if you were a member of a registered pension scheme in each of those earlier years.
Pension Savings Statements
Your pension provider must send you a pension savings statement automatically if your total pension inputs exceed the annual allowance, and the statement must reach you by 6 October following the end of the tax year.11GOV.UK. Information Pension Scheme Administrators Must Give to Members If you stayed below the limit and no statement arrived, you can request one from your provider, who then has three months to send it.