Pension Tax Relief at Source vs Net Pay — What's the Difference?
If you've ever looked into how pension tax relief actually works, you've probably encountered two terms that sound confusingly similar: "relief at source" and "net pay." Both achieve roughly the same end result — you get tax relief on your pension contributions — but they work in fundamentally different ways, and the method used can affect how much you actually receive.
For self-employed sole traders, understanding the difference matters more than you might think. It affects how you record contributions, how you claim relief on your tax return, and whether you might be losing out without realising it.
Let's untangle these two systems.
The Basic Idea Behind Pension Tax Relief
Before we get into the two methods, let's recap what pension tax relief is. When you contribute to a pension, the government gives you back the income tax you would have paid on that money. The logic is simple: pension savings are taxed later (when you draw the pension in retirement) rather than now.
For a basic-rate taxpayer (20%), every £100 that goes into your pension effectively costs you £80. For a higher-rate taxpayer (40%), it costs £60. And for an additional-rate taxpayer (45%), it costs £55.
The question is: how does that tax relief actually get applied? That's where the two methods come in.
Relief at Source — How It Works
Relief at source is the method used by most personal pensions, SIPPs, and stakeholder pensions. It's the system most sole traders will encounter.
The mechanics
- You contribute from your net (after-tax) pay. If you want £100 to end up in your pension, you pay £80 from your bank account.
- Your pension provider claims 20% from HMRC. They add the £20 basic-rate tax relief to your pot, bringing it up to £100.
- Higher and additional-rate taxpayers claim the extra. If you pay tax at 40% or 45%, you claim the additional relief through your Self Assessment tax return.
Key features
- The basic-rate relief is automatic — you don't need to do anything to claim it.
- Higher-rate relief requires action on your part (via Self Assessment).
- Everyone receives at least basic-rate relief, even non-taxpayers, up to a gross contribution of £3,600.
- Your pension provider handles the HMRC claim for the basic rate.
Example
You're a higher-rate taxpayer and want to put £10,000 (gross) into your SIPP this year.
- You transfer £8,000 from your bank account to your SIPP.
- Your SIPP provider claims £2,000 from HMRC. Your pot now holds £10,000.
- On your Self Assessment return, you declare the £10,000 gross contribution.
- HMRC calculates the additional relief: 20% of £10,000 = £2,000 extra.
- You receive £2,000 as a reduction in your tax bill (or a refund).
- Net cost to you: £6,000 for £10,000 in the pension.
Net Pay — How It Works
The net pay arrangement is the method used by most occupational (workplace) pension schemes, including many defined benefit schemes and some defined contribution schemes.
The mechanics
- Your contribution is deducted from your gross pay before income tax is calculated.
- You pay tax on the reduced amount. Because your pensionable contribution is taken off before tax, you automatically receive full tax relief at your marginal rate.
- No further claim is needed. The relief is built into the payroll calculation.
Key features
- Tax relief is automatic and immediate for all taxpayers, including higher and additional-rate taxpayers.
- No need to claim anything through Self Assessment.
- The pension provider doesn't need to reclaim anything from HMRC.
- Works through the PAYE system, so it's primarily an employment-based method.
Example
You're employed part-time and earn £3,000 per month gross. You contribute 5% to a workplace pension via net pay.
- Your pension contribution: £150 per month.
- Your taxable pay: £3,000 - £150 = £2,850.
- Income tax is calculated on £2,850, not £3,000.
- If you're a basic-rate taxpayer, you save £30 per month in tax (20% of £150).
- If you're a higher-rate taxpayer, you save £60 per month (40% of £150).
The relief happens automatically in your payslip. You don't need to do anything else.
The Critical Difference
The most significant practical difference between the two methods is what happens for basic-rate taxpayers and non-taxpayers.
Relief at source: everyone gets at least 20%
Under relief at source, even if you earn below the personal allowance (£12,570 for 2025/26) and pay no income tax, you still get the 20% top-up from HMRC on contributions up to £3,600 gross. This is a genuine bonus — free money, in effect.
Net pay: low earners can lose out
Under net pay, if you earn below the personal allowance, there's no tax to relieve. Your contribution is deducted from gross pay, but since you wouldn't have paid tax on that income anyway, the net pay method gives you nothing. You've put the money into your pension without receiving any tax benefit.
This was a well-documented problem for years, sometimes called the "net pay anomaly." It affected around 1.5 million low-paid workers who were in net pay schemes — typically women working part-time. The government introduced a fix from April 2025: HMRC now makes a top-up payment to low earners in net pay schemes, broadly matching what they would have received under relief at source.
Which Method Applies to You?
If you're a sole trader contributing to a personal pension or SIPP, you'll be using relief at source. This is virtually universal for self-employed pension saving.
If you're also employed (perhaps part-time alongside your self-employment), your workplace pension will likely use net pay — though some workplace schemes use relief at source. Your payslip should indicate which method applies.
If you have pensions using both methods (which is perfectly possible if you're both employed and self-employed), you need to be aware of how each works to ensure you're claiming all the relief you're entitled to.
How This Affects Your Self Assessment Return
This is where it gets particularly relevant for sole traders.
Relief at source contributions
On your Self Assessment return, you enter your gross personal pension contributions — that's the total including the basic-rate relief already claimed by your provider.
So if you paid £8,000 from your bank account and your provider topped it up to £10,000, you enter £10,000. HMRC then works out the additional higher-rate or additional-rate relief due and adjusts your tax bill accordingly.
If you're only a basic-rate taxpayer, you don't strictly need to enter the contribution at all (since all the relief has already been claimed by your provider), but it's good practice to include it.
Net pay contributions
If you have a workplace pension using net pay, you don't enter those contributions on your Self Assessment return. The relief has already been given through PAYE. Including them would give you double relief — which HMRC would eventually spot and reclaim.
Getting it wrong
Entering the wrong type of contribution, or entering gross when you should enter net (or vice versa), is a common error. If you're using Accounted to manage your tax return, Penny can help you work out which figures go where — especially if you have multiple pension arrangements.
What About Salary Sacrifice?
Salary sacrifice is a variation worth mentioning. Under a salary sacrifice arrangement, you agree to reduce your gross salary, and your employer pays the sacrificed amount into your pension instead. Because the money goes to the pension before you receive it, it's technically an employer contribution, not an employee contribution.
The advantage: you save both income tax and employee National Insurance on the sacrificed amount. This makes it more tax-efficient than either relief at source or net pay for the employee.
Salary sacrifice is only available to employees, not sole traders. But if you have part-time employment alongside your self-employment, it's worth asking your employer whether they offer it.
Common Questions
Can I choose which method my pension uses?
No. The method is determined by the type of pension scheme. Personal pensions and SIPPs use relief at source. Most workplace schemes use net pay. You can't switch.
Does the method affect how much relief I get?
For most taxpayers, the end result is the same — you get relief at your marginal tax rate. The exception is the net pay anomaly for low earners, which the government has now addressed.
Is one method better than the other?
For higher and additional-rate taxpayers, net pay is slightly more convenient because the relief is automatic (no need to claim via Self Assessment). For basic-rate and lower earners, relief at source has traditionally been more favourable. In practice, the differences are now small.
How do I know which method my workplace pension uses?
Check your payslip. If your pension contribution is deducted before tax is calculated, it's net pay. If it's deducted after tax (and appears lower than your stated contribution rate), it's relief at source. If in doubt, ask your employer or pension provider.
Why This Matters for Sole Traders
As a sole trader, your main concern is ensuring you claim all the tax relief you're entitled to on your personal pension contributions. Since you'll be using relief at source, that means:
- Your provider claims 20% automatically. You don't need to do anything for this.
- You claim extra relief through Self Assessment. If you pay tax at 40% or 45%, enter your gross contribution on your tax return. This is essential — don't miss the higher-rate relief.
- Track your contributions carefully. Know the difference between what you paid from your bank account (net) and what ended up in your pension (gross). Accounted makes this straightforward by letting you record pension payments alongside your other business transactions.
Understanding the mechanics of pension tax relief isn't just academic — it directly affects how much money you have in retirement. Make sure you're getting every penny you're entitled to.
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Tax & Compliance Specialists
Our tax specialists have decades of combined experience in UK sole trader and small business taxation, MTD compliance, and HMRC submissions. All content is reviewed against current HMRC guidance before publication and updated quarterly to reflect legislative changes.
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