What Is Adjusted Net Income — And Why It Controls Your Tax Position

The number HMRC actually uses to judge your tax position

Your salary is not the number that controls your tax bill. Your adjusted net income (ANI) is.

ANI is the figure HM Revenue & Customs (HMRC) uses to determine your Personal Allowance, your eligibility for childcare benefits, and whether you face the High Income Child Benefit Charge (HICBC). It can look quite different from your gross salary — and closing that gap is where most real tax optimisation happens.

If your gross income sits anywhere near £100,000, understanding ANI isn't optional. It's the mechanism behind the £100k personal allowance trap, the 60% effective marginal tax rate, and thousands of pounds in childcare entitlements that can vanish without warning.

How adjusted net income is calculated

HMRC starts with your total income from all sources, applies a series of deductions, and the result is your ANI.

Step 1: Total income

This covers employment income, self-employment profits, rental income, savings interest, dividends, and any other taxable income.

Step 2: Deductions

From that total, HMRC subtracts:

• Pension contributions made via salary sacrifice into your pension (these reduce your gross pay before tax, cutting ANI directly)
• Personal pension contributions paid net of basic rate tax and grossed up (for example, contributions to a SIPP)
• Gift Aid donations (grossed up at the basic rate)
• Trading losses carried forward or set against other income

What doesn't reduce your ANI: standard reliefs like the Personal Allowance itself, or National Insurance contributions. Those come later in the calculation.

In plain terms:

ANI = Total income − pension contributions (relief at source, grossed up) − Gift Aid donations (grossed up) − other qualifying deductions

If your gross salary is £110,000 and you make £12,000 of salary sacrifice into your pension, your ANI drops to £98,000. That single change moves you below the £100k threshold — and everything tied to that threshold shifts with it.

Why ANI controls far more than just your income tax

Most people treat ANI as a background calculation detail. In practice, it's the trigger for three separate financial penalties, each operating independently of the others.

The Personal Allowance taper

The standard Personal Allowance for 2026/27 is £12,570. For every £2 your ANI exceeds £100,000, you lose £1 of that allowance. By the time your ANI reaches £125,140, it's gone entirely.

This is what creates the 60% effective marginal tax rate. Here's the maths on a single extra £2 of income between £100k–£125,140:

• You pay 40% income tax on that £2 directly
• You also lose £1 of Personal Allowance — income that was previously tax-free now isn't, costing you an additional 40% on that £1
• Total tax on that £2: £0.80 + £0.40 = £1.20, which is 60%

You're not in a 60% tax band in the traditional sense. You're facing a 60% effective marginal rate caused by the simultaneous erosion of your allowance. For a full breakdown across different salary levels, see how the £100k tax trap really works (and how to avoid it).

30 Free Hours childcare and Tax-Free Childcare

If either parent's ANI exceeds £100,000, your household loses:

• 30 Free Hours of childcare per child (worth approximately £6,000+ per child per year)
• Tax-Free Childcare, the government top-up scheme worth up to £2,000 per child per year

These are ANI thresholds, not salary thresholds. A parent earning £104,000 gross who makes a £5,000 salary sacrifice into their pension brings their ANI to £99,000 — below the line — and reclaims both benefits. That's potentially £8,000+ per child back from one adjustment.

The High Income Child Benefit Charge

The HICBC kicks in when either parent's ANI exceeds £60,000. Between £60,000 and £80,000, Child Benefit is clawed back at 1% for every £200 of ANI above £60,000. Above £80,000, you repay all of it.

For a family claiming Child Benefit for two children in 2026, that clawback can exceed £2,000 per year. Reducing your ANI below the relevant threshold removes the charge entirely.

How to reduce your adjusted net income

The most direct and widely available method is salary sacrifice into your pension. Because salary sacrifice reduces your gross pay before HMRC sees it, it cuts your ANI pound for pound.

Other routes include:

• Personal pension contributions (paid net, grossed up via relief at source — reduces ANI when you claim through Self Assessment)
• Gift Aid donations (grossed up, reduce ANI when declared on your Self Assessment return)
• Cycle to Work and other salary sacrifice benefits (reduce gross pay, though the ANI impact is smaller than pension sacrifice)

The pension route tends to be the most powerful because the amounts can be large enough to move your ANI across a meaningful threshold in one step. A £10,000 salary sacrifice for someone earning £107,000 doesn't just save income tax — it can restore the full £12,570 Personal Allowance, unlock 30 Free Hours childcare, and eliminate the HICBC simultaneously.

For how the 2026/27 rates interact with your specific position, optimising your 2026/27 tax year covers the timing decisions and thresholds in detail.

Modelling the difference: a worked example

Take a senior developer earning £112,000 with one child in nursery.

Without any ANI reduction:

• ANI: £112,000
• Personal Allowance: £12,570 − £6,000 taper = £6,570 remaining
• Effective marginal rate on income between £100k–£112k: 60%
• 30 Free Hours: not eligible
• Tax-Free Childcare: not eligible
• Annual nursery cost (net): approximately £18,000

With £13,000 salary sacrifice into their pension:

• ANI: £99,000
• Personal Allowance: £12,570 fully restored
• Effective marginal rate: back to standard 40%
• 30 Free Hours: eligible (saving approximately £6,000/year)
• Tax-Free Childcare: eligible (saving up to £2,000/year)
• Tax saving from restored allowance: approximately £5,028
• Total annual benefit from one change: £13,000+

The pension contribution isn't lost money — it goes into your retirement pot, with employer contributions on top. The tax and childcare savings are the net gain on top of that.

A £13,000 salary sacrifice at £112,000 can generate over £13,000 in combined tax and childcare savings — effectively making the pension contribution cost nothing on a net basis.

Model your own ANI and see your exact savings at taxpilot.diy →

FAQs

What is adjusted net income in the UK? Adjusted net income (ANI) is the figure HMRC arrives at after subtracting qualifying deductions — primarily pension contributions and Gift Aid donations — from your total income. It determines your Personal Allowance, childcare eligibility, and exposure to the High Income Child Benefit Charge.

Is adjusted net income the same as taxable income? No. Taxable income is calculated after your Personal Allowance has been applied. ANI is calculated before that step, and it's ANI that determines how much Personal Allowance you receive in the first place. The two figures can differ significantly.

Does salary sacrifice reduce adjusted net income? Yes. Salary sacrifice into your pension reduces your gross pay before HMRC calculates your ANI, so it reduces ANI pound for pound. A £10,000 salary sacrifice reduces your ANI by £10,000.

What happens to my Personal Allowance when my ANI exceeds £100,000? You lose £1 of Personal Allowance for every £2 your ANI exceeds £100,000. At ANI of £125,140, your Personal Allowance reaches zero. This is what creates the 60% effective marginal tax rate on income in that range.

Does Gift Aid affect adjusted net income? Yes. Gift Aid donations are grossed up at the basic rate and deducted from your total income when HMRC calculates your ANI. If you make significant charitable donations and declare them on your Self Assessment return, they can reduce your ANI and help you avoid the Personal Allowance taper or HICBC.

How does ANI affect childcare entitlements? If either parent's ANI exceeds £100,000, the household loses eligibility for 30 Free Hours childcare and Tax-Free Childcare. These are hard thresholds — £1 above £100,000 ANI removes the benefit entirely. Reducing ANI below £100,000 via pension sacrifice restores both.

Do I need to file a Self Assessment return to claim ANI deductions? For salary sacrifice, no — your employer handles it before payroll. For personal pension contributions paid net to a SIPP and Gift Aid donations, yes — you need to declare these on a Self Assessment return for HMRC to adjust your ANI and issue any tax refund or revised tax code.