Millions of Brits could miss out on £1,300 by not completing 'quick and easy' check from this week

Millions of Brits could miss out on over £1,300 if they don't complete a 'quick check' online.

HMRC issued the warning online again for people to keep an eye on their post or risk losing out.

Parents receive up to £25.60 per week for their eldest child and up to £16.95 for any additional children. (Getty Stock Photo)

Parents are set to receive a reminder letter from HMRC over the coming weeks, asking them if their child is still in full-time education or training, in order to receive their child benefit payment.

You get child benefit if you’re responsible for bringing up a child who is either under the age of 16 or under the age of 20 - if they stay in approved education or training.

Only one person can receive the benefits and there's no limit on how many children you can claim for.

While you'll receive £25.60 per week for your eldest child, you're eligible to claim £16.95 for any additional children after that.

HMRC explains that child benefit is worth up to £1,331 a year for the first child and up to £881 a year for each additional child.

Parents will receive a letter from HMRC. (Getty Stock Photo)

The letter - which will be sent out to parents between 24 May and 17 July - will include a QR code which will direct mums and dads to the gov.uk website.

From there, they can renew their child benefit claim online.

"Child benefit is an important financial support for many families, so make sure you don’t miss out," says Myrtle Lloyd, HMRC’s director general for customer services.

"You can quickly and easily extend your claim online or via the HMRC app, just search “Child Benefit when your child turns 16 on gov.uk."

There's no limit on how many children you can claim for. (Getty Stock Photo)

While everyone with a child is eligible for child benefit payments, high earners are subject to the High Income Child Benefit Charge.

"If either your or your partner’s ‘adjusted net income’ is over £60,000 a year, you may have to pay the High Income Child Benefit Charge," the gov.uk website explains.

"If you have to pay the charge, you can still get the other advantages of Child Benefit like National Insurance credits. The charge will not be more than the amount you get from the Child Benefit payments."

If you or your partner earn more than £80,000, you'll be charged the same amount that you would make from claiming the benefit.

Gov.uk explains: "If either you or your partner has an individual income of £80,000 or over, you’ll be charged the same amount as you make through Child Benefit payments. You’ll end up with no extra money from Child Benefit."