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Does Salary Sacrifice Pension Help Keep 30 Hours Childcare?

Yes — and for most employed parents, it's the single most effective tool available. If your Adjusted Net Income (ANI) is sitting above £100,000 and you're at risk of losing your childcare entitlement, increasing your salary sacrifice pension contributions is very likely the fastest, most tax-efficient way to bring that number back down. Here's exactly how it works, how it compares to the alternative, and what to watch out for.

What Is Salary Sacrifice?

Salary sacrifice is an arrangement between you and your employer. You formally agree to give up a portion of your gross salary, and in return, your employer pays that equivalent amount directly into your pension pot as an employer contribution.

The key word is gross. The sacrifice happens before your income is calculated for tax, National Insurance, or Adjusted Net Income purposes. From HMRC's perspective, you simply never earned that portion of your salary. It never appears in your gross pay figure.

For parents navigating the salary sacrifice childcare 100k threshold, this is enormously powerful. If you earn £106,000 and sacrifice £7,000 into your pension, your gross salary for ANI purposes becomes £99,000. You've crossed back under the threshold — legally, cleanly, and with money that's still yours, just held in your pension.

There's a secondary bonus too. Because salary sacrifice reduces your gross pay, both you and your employer pay less National Insurance on that portion. You keep slightly more of the benefit than you would through other methods.

What Is Relief at Source?

Relief at source is the method used by personal pensions and SIPPs (Self-Invested Personal Pensions). Rather than your employer routing the money before it hits your payslip, you contribute from your take-home pay and HMRC adds basic rate tax relief on top.

Here's how the mechanics work: you pay £8,000 from your net pay into your SIPP. Your pension provider automatically claims 20% basic rate tax relief from HMRC and adds it to your pot, bringing your total pension contribution to £10,000.

For ANI purposes, HMRC deducts the grossed-up contribution — meaning the full £10,000 comes off your Adjusted Net Income, not just the £8,000 you physically paid. This is the relief at source vs salary sacrifice childcare comparison that trips many people up. Both methods work for reducing ANI, but the mechanics are different.

Side-by-Side Comparison

To make this concrete, here's how both approaches work for a parent earning £104,000 who needs to get below £100,000.

Using salary sacrifice:

Using relief at source (SIPP):

Both routes get you to the same destination. The practical differences are that salary sacrifice is simpler (it happens automatically via payroll) and marginally more efficient due to the NI saving. Relief at source requires you to file a Self Assessment return to claim the full higher-rate relief, but it's an excellent option if your employer doesn't offer salary sacrifice — or if you want to top up beyond what your workplace scheme allows.

Using a pension contribution to avoid the 100k tax trap through either method is entirely legal and actively encouraged by HMRC's own tax rules. You are not exploiting a loophole — you are using the system exactly as designed.

Timing Matters More Than Most Parents Realise

One aspect that catches families off guard is the timing of income events within the tax year.

Your ANI is calculated for the full tax year (6 April to 5 April). If you receive a large bonus in February that pushes you over £100,000, your ANI for that entire year is affected — including childcare claims you made in April through January. HMRC can claw back Tax-Free Childcare top-ups if your final ANI exceeds £100,000 at year end.

This means that if you're expecting a bonus, a commission payment, or any one-off income spike, you should model your ANI before that payment arrives — not after. Increasing your pension contributions proactively at the start of the tax year, or immediately when you learn about a forthcoming bonus, gives you the most flexibility.

Salary sacrifice is particularly useful here because your employer can usually adjust your contribution rate relatively quickly. A SIPP contribution can also be made as a lump sum before 5 April, allowing you to respond to income events as they happen.

If your income is variable or bonus-heavy, consider building in a small buffer — aiming for an ANI of £97,000 to £98,000 rather than cutting it right at the edge. The cost of miscalculating is losing your entire childcare entitlement; a little extra pension contribution is cheap insurance.

Know Your Number Before You Act

The biggest mistake parents make is adjusting their pension contributions based on rough estimates. Contribute too little and you remain over the threshold. Contribute too much and you've tied up cash unnecessarily.

Use our free £100k Threshold Calculator to enter your gross salary, current pension contributions, any SIPP payments, and Gift Aid donations. It will show you your current estimated ANI, whether you're at risk, and exactly how much additional contribution — through salary sacrifice or relief at source — would bring you safely under the line.