How to Calculate Adjusted Net Income for Childcare in the UK

If your salary recently tipped over £100,000, you may have been told you've lost your right to free childcare hours. It feels brutal — one extra pound of earnings and suddenly thousands of pounds of childcare support disappears. But here's the good news most parents don't know: that threshold isn't based on your headline salary. It's based on something called your Adjusted Net Income (ANI), and with the right planning, many parents earning £105,000 or even £110,000 can bring that number below £100k and reclaim their entitlement.

This guide explains exactly how to calculate adjusted net income for childcare, in plain English — no accountancy degree required.

What Is the £100k Childcare Threshold?

The 100k childcare threshold applies to Tax-Free Childcare and the government's free hours schemes (15 and 30 hours per week). To qualify, neither parent can have an adjusted net income above £100,000 in the current tax year.

HMRC doesn't look at what hits your bank account, or even your gross salary figure on your contract. They look at your Adjusted Net Income — a specific figure that accounts for deductions you're legally entitled to make. This distinction is enormously important, and many parents miss it entirely.

The Formula: How to Calculate Adjusted Net Income

The core calculation is simpler than it sounds:

Adjusted Net Income = Gross Salary − Pension Contributions − Gift Aid Donations (grossed up)

Let's break each part down.

Gross Salary is your total employment income before any deductions — the number on your contract or P60.

Pension Contributions are deducted depending on how you contribute. If your contributions go through a salary sacrifice scheme, they're taken before tax, which means your gross salary is already reduced before you even reach the ANI calculation — this is the most powerful and straightforward method. If you contribute to a relief at source pension (like a personal pension or SIPP), HMRC grosses up your contribution by 20%, and you deduct the grossed-up amount from your income. For example, a £4,000 personal pension contribution becomes £5,000 grossed up.

Gift Aid donations work similarly to relief-at-source pensions. If you donate to charity under Gift Aid, you deduct the grossed-up value. A £800 cash donation becomes a £1,000 deduction against your ANI.

What Pension Contributions Count?

This is where many parents get confused, so let's be specific.

• Workplace salary sacrifice pension — reduces your gross pay directly, so it lowers your ANI pound for pound before the calculation even begins
• Personal pension or SIPP contributions — deduct the grossed-up amount (your payment ÷ 0.8)
• Additional Voluntary Contributions (AVCs) made through your employer's scheme — these also count

What doesn't reduce your ANI? Things like student loan repayments, charitable payroll giving (which works differently from Gift Aid), and most employee benefits. Always check with your pension provider or a financial adviser if you're unsure which category your contributions fall into.

Two Real-World Examples

These examples show how the same threshold can work in practice.

Example 1 — Sarah, using salary sacrifice

Sarah earns £105,000 as a marketing director. Her employer offers salary sacrifice pension contributions. She increases her monthly pension sacrifice so that £6,000 per year is redirected into her pension before it counts as gross pay.

Her adjusted net income calculation:

• Gross salary: £105,000
• Salary sacrifice pension: −£6,000
• Adjusted Net Income: £99,000 ✅

Sarah is now under the 100k childcare threshold and qualifies for Tax-Free Childcare and free hours. She's also saving on National Insurance contributions — a bonus benefit of salary sacrifice.

Example 2 — James, using a personal pension

James earns £105,000 as a project manager. His workplace doesn't offer salary sacrifice, so he makes personal pension contributions into a SIPP. He pays £4,000 into his SIPP. Because HMRC grosses this up by 20%, the deduction against his ANI is £5,000.

His adjusted net income calculation:

• Gross salary: £105,000
• Grossed-up pension contribution: −£5,000
• Adjusted Net Income: £100,000

James is right on the line. By contributing a little more — even an extra £800 into his SIPP (worth £1,000 grossed up) — he'd fall clearly below the threshold and secure his childcare entitlement.

Why This Matters More Than You Think

The value of staying under £100k isn't just the childcare hours themselves — it's also about avoiding the 60% effective tax trap that occurs between £100k and £125,140, where your personal allowance is gradually withdrawn. Getting your ANI below £100k can save families thousands of pounds per year in combined tax and childcare costs.

Using an adjusted net income calculator UK childcare tool takes the guesswork out of this entirely. Rather than doing the sums manually and worrying you've got it wrong, a calculator lets you plug in your salary, pension contributions, and Gift Aid donations and instantly see where you stand.

Run Your Numbers Now

Don't leave your childcare entitlement to chance. Use our free £100k Childcare Cliff Calculator to enter your salary and deductions and see your estimated Adjusted Net Income in seconds. It's built specifically for UK parents navigating the 100k childcare threshold — clear, fast, and free to use.