Net Pay Arrangement vs Relief at Source: Why Your Pension Method Matters in 2026/27

Quick answer

Both net pay arrangements and relief at source are designed to give tax relief on pension contributions, but they work in fundamentally different ways — and for anyone earning below the personal allowance, the difference isn't just administrative, it changes whether any tax relief is actually received on contributions at all.

How each method actually works

Under a net pay arrangement, pension contributions come out of gross salary before income tax is calculated on the remainder — meaning the individual's taxable income is reduced directly, and relief is given immediately and automatically at whatever marginal rate applies to that portion of income. Under relief at source, contributions are instead deducted from pay after tax has already been calculated and paid, and the pension provider then separately claims basic-rate tax relief from HMRC and adds it into the pension pot — so a £80 contribution becomes £100 in the pension after the provider's 20% top-up is added.

The anomaly that catches out low earners

This is where the two methods genuinely diverge in outcome, not just mechanism. Someone earning below the £12,570 personal allowance pays no income tax at all, so under a net pay arrangement there's simply no tax to relieve — contributions go in at full cost with no government top-up. Under relief at source, however, the same low earner still receives the 20% basic-rate relief added to their pension pot by the provider, regardless of whether they actually paid any income tax — an outcome that seems to reward relief-at-source schemes for low earners over net pay schemes, purely based on scheme design rather than anything the individual controls.

Why this matters more than it sounds

For a low earner, the difference between the two methods can be worth hundreds of pounds a year in "free" pension top-up money that either does or doesn't materialise depending purely on which method their employer's chosen pension scheme happens to use — something the individual generally has no say over, since it's set at scheme level, not chosen per member. Government has acknowledged this as a genuine anomaly and has explored mechanisms to correct it with separate top-up payments for low earners in net pay schemes, but checking which method a specific scheme actually uses remains the practical starting point for anyone wanting to understand their own position.

What higher earners need to actively do

For higher and additional-rate taxpayers, both methods ultimately deliver the correct marginal-rate relief — but under relief at source, only the basic-rate portion is added automatically by the pension provider; the additional relief above basic rate has to be actively claimed, typically through a Self Assessment return or by contacting HMRC directly. Under a net pay arrangement, the full marginal-rate relief is already reflected automatically in the reduced taxable income, with nothing further to claim.

How to check which method applies

The clearest way to find out is to check the scheme's member booklet or ask HR or the pension provider directly whether contributions are taken before tax (net pay) or after tax with relief added back (relief at source) — the wording on a standard payslip doesn't always make this distinction obvious, and it's a detail worth confirming rather than assuming.

Bottom line

The method matters most for low earners, where relief at source can mean a meaningful top-up that a net pay arrangement simply doesn't provide — anyone unsure which method their workplace scheme uses, particularly if they earn near or below the personal allowance, should check directly rather than assume all pension tax relief works the same way.

Sources

• gov.uk: Tax on your private pension contributions
• HMRC: Pensions Tax Manual — relief at source and net pay