UK Child Benefit Charge Calculator

Adjusted net income is broadly your total taxable income for the year (salary, bonuses, rental income, savings interest, dividends, and so on) minus gross personal pension contributions and Gift Aid donations, grossed up for basic rate tax. It is not simply your salary. Two people on the same headline salary can have quite different adjusted net income once pension contributions and other deductions are taken into account, which is exactly why increasing pension contributions is such a common way to reduce or avoid the charge.

Personal pension contributions (whether relief-at-source, salary sacrifice, or net pay arrangements) reduce your adjusted net income pound for pound on a gross basis. If increasing your pension contributions brings your adjusted net income back under £60,000, you avoid the charge entirely, and you also get pension tax relief on the money at the same time. For someone sitting just inside the £60,000 to £80,000 band, this is often the single most effective planning move: it reduces both the charge and, if it also drags them back under £100,000, the separate personal allowance taper.

This depends on your specific numbers, but there is a reason to keep claiming even if you expect to repay all of it: claiming Child Benefit for a child under 12 gives the claiming parent (usually the one who is not working, or working part-time) National Insurance credits toward their State Pension. If you opt out entirely, you can still fill in the claim form to get these credits without receiving the payments, which avoids both the cash-flow hassle of paying the charge back and the risk of losing NI credits by mistake. If you are certain your income will always be at or above £80,000 and the credit-only route works for your household, opting out of payment can simplify your Self Assessment; otherwise many households simply keep the payments and pay the charge back.

The charge is collected through Self Assessment. If you or your partner are liable, you need to register for Self Assessment (if you are not already registered) and declare the charge on your tax return for that tax year, then pay it by the usual 31 January deadline. HMRC does not currently deduct it automatically through PAYE by default, though it introduced an option in some years to collect it via a tax code adjustment instead of a Self Assessment bill; check the current option on gov.uk before assuming which applies to you.

The charge is based on the adjusted net income of whichever partner in the household has the higher income, not on your combined household income. So if one partner earns £90,000 and the other earns £20,000, the charge is calculated purely on the £90,000 income and the full amount is clawed back, even though household income split more evenly might otherwise have kept both partners under the threshold individually. This individual (rather than household) basis is a well known quirk of the charge: two partners each earning £55,000 (£110,000 combined) pay no charge at all, while a single earner on £90,000 with a non-earning partner loses their entire Child Benefit.

Yes, and if your adjusted net income is above £100,000 you can be affected by both at once. Between £100,000 and £125,140, you lose £1 of your tax-free Personal Allowance for every £2 you earn, which on its own creates an effective marginal rate often quoted as around 60%. If your adjusted net income also falls between £60,000 and £80,000 you are hit by the Child Benefit taper too, though these two specific bands (£60k-£80k and £100k-£125,140) do not fully overlap unless your income sits exactly across both ranges at different points in the year. Someone whose income rises from £95,000 to £105,000, for example, would move out of the Child Benefit taper (already at 100% clawback above £80,000) and into the personal allowance taper, so the two effects are usually sequential rather than simultaneous, but the combined effect across the whole band from £60,000 to £125,140 is why this stretch of income is often described as the most punishing part of the UK tax system for earners with children.

No, one claim covers all your children, but the amount is structured differently for each: you get a higher weekly rate for your eldest (or only) child and a lower weekly rate for each additional child. The High Income Child Benefit Charge then applies to the combined total you are entitled to, not to each child's payment separately, so the more children you have, the larger the absolute charge (and the steeper the effective marginal rate within the £60,000 to £80,000 band) if your income sits in the taper.

It is based on your adjusted net income for the tax year, which runs from 6 April to the following 5 April, matching the UK tax year used for Income Tax and Self Assessment generally. If your income fluctuates significantly during the year, for example due to a bonus, a pay rise partway through the year, or self-employment income assessed on an accounting-year basis, it is your total adjusted net income across that full tax year that determines where you sit in the taper, not your income at any single point in time.

It is common to estimate income at the start of the tax year and find the actual figure differs once bonuses, overtime, or other variable pay are finalised. If you are close to either threshold, it is worth reviewing your position again nearer the end of the tax year (or as soon as you have a reasonably firm year-end estimate) so you can adjust pension contributions or Gift Aid giving before 5 April if that would meaningfully change your charge. Once the tax year has ended, your adjusted net income for that year is fixed and cannot be reduced retrospectively except through a small number of specific reliefs.