Child Benefit calculator

Two rates, and no two-child limit

Child Benefit is one of the simplest payments in the UK system and one of the most misunderstood. There are exactly two rates: a higher one for the eldest or only child, and a lower one for every child after that. They are flat, national, and paid every four weeks, usually into the account of whoever made the claim.

The most persistent confusion is with the two-child limit, which does not apply here. That restriction belongs to Universal Credit and Child Tax Credit. Child Benefit is paid for every child under 16, or under 20 if they stay in approved education or training, regardless of how many there are.

The charge that turned a universal benefit into a means test

Since 2013 there has been a tax charge that claws Child Benefit back from higher earners. It is not a cut to the benefit — the money is still paid — but an income tax charge on the higher earner in the household, worked out as a percentage of the Child Benefit received.

The mechanics are gradual rather than a cliff. For every £200 of adjusted net income above the threshold, 1% of the year's Child Benefit is charged back. Cross the upper figure and the charge equals the whole benefit, so the household nets nothing.

Adjusted net income is not your salary

The figure the charge is measured against is adjusted net income: total taxable income including savings interest and dividends, worked out before Personal Allowances and after reliefs such as pension contributions and Gift Aid donations. It is not the number on your payslip and it is not your P60 gross.

That distinction has a practical consequence for anyone in the band between the two thresholds. Because pension contributions come off before the figure is calculated, increasing them reduces the income the charge is measured against. In that band the effective marginal rate on additional income is unusually high — you are paying income tax, National Insurance and losing a slice of Child Benefit on the same pound — which is why salary sacrifice and pension contributions are worth a conversation with payroll or an adviser rather than a shrug.

The unfairness people notice

The charge falls on one person's income, not on the household's. A couple each earning just under the threshold — comfortably more between them than a single earner above the upper figure — keep everything. A single-earner household on a lower total income keeps nothing.

The design also means the charge can fall on a person who never sees the money. The benefit is usually paid to the parent who made the claim; the charge is levied on whichever partner has the higher adjusted net income. In households where those are different people, and particularly in households that separate mid-year, this produces some genuinely awkward tax bills.

Claim it even when you will not keep a penny

This is the single most valuable thing on this page, and it is routinely missed. A household expecting the whole benefit to be clawed back often decides not to bother claiming. That is a mistake, because the claim does two things that have nothing to do with the money.

First, it credits the National Insurance record of whichever parent is registered as claiming, in every week they are looking after a child under 12. Those credits count towards the State Pension. A parent who spends several years at home without them can end up with gaps in their record that are expensive or impossible to fill later, and this is the mechanism that prevents it.

Second, it triggers the automatic issue of a National Insurance number to the child shortly before their sixteenth birthday. Without a claim, that has to be applied for separately.

The fix is simple: make the claim, and tick the box to receive no payments. You get no money, you owe no tax charge, and you keep both of the things above. GOV.UK offers this option explicitly.

Claim early, because backdating is short

Child Benefit can be backdated only 3 months from the date the claim is made. Not to the birth — three months back from the date the form arrives. A claim made when the baby is six months old permanently loses roughly three months of payments.

You can claim 48 hours after registering the birth. You can also claim before the birth certificate arrives if registration has been delayed, and send the certificate on when asked. Given that registering the birth is itself a 42-day duty in England, Wales and Northern Ireland and a 21-day one in Scotland, the sensible sequence is to register, wait two days, and claim.

The other payments people confuse with this one

Child Benefit is not the Sure Start Maternity Grant, which is a one-off means-tested payment claimable up to six months after the birth in England, Wales and Northern Ireland. It is not the Best Start Grant, which is Scotland's more generous equivalent. It is not the Healthy Start or Best Start Foods card, which loads money onto a card for milk, fruit, vegetables and formula. And it is not the Scottish Child Payment.

All of those are separate applications with separate rules, and several of them close on dates that Child Benefit does not share. Working through them one at a time, rather than assuming a single form covers everything, is the only reliable approach — except in Scotland, where one Social Security Scotland application does genuinely cover several of the family payments at once.

How the charge gets collected

Historically the charge was collected through Self Assessment, which meant registering for it even if you had never filed a return. More recently it has become possible to pay it through PAYE instead. Either way it does not collect itself, and HMRC will still want it. If your income has crossed the threshold since you claimed, that is the moment to check which route applies to you.