Claiming Child Benefit for a Grandchild: CH2 Form, Proof of Care and Backdating

Why Child Benefit Should Be Your First Claim

When a grandchild moves in, Child Benefit is often the fastest route to regular income — and it does more than provide weekly cash. The claim also generates Class 3 National Insurance credits towards your State Pension for every year the child is under 12. Missing those credits costs you money in retirement that you cannot recover.

For 2026/27, the eldest or only child rate is £27.05 per week (£1,406.60/year). Each additional child adds £17.90 per week (£930.80/year). The benefit is non-means-tested: your income doesn't matter for eligibility. If you or a partner has adjusted net income above £60,000, the High Income Child Benefit Charge claws back some of the cash — but you should still claim to protect those NI credits, opting out of payment if needed.

The CH2 Form: What You Need and Where to Send It

You can claim online through GOV.UK or the HMRC app. If you prefer paper, download Form CH2 from GOV.UK and post it to the Child Benefit Office. Claiming for more than two children on paper requires the additional Form CH2(CS).

Documents to have ready:

• The child's birth certificate (required if born outside England/Wales, or if HMRC requests it)
• Your bank or building society details
• Your National Insurance number
• The child's National Insurance number if they have one
• A copy of any court order you hold (SGO, Child Arrangements Order, or Residence Order)

If you don't have the birth certificate because the parents haven't handed it over, submit the claim anyway. HMRC will write to ask for it, and waiting for the certificate before claiming costs you backdating.

Proving the Child Lives With You

HMRC uses a "residence priority" rule: the person the child actually lives with takes legal priority over someone who merely pays towards the child's costs. If a parent is still claiming Child Benefit for a child who now lives with you, HMRC will investigate — they call this a "competing claim."

Evidence that strengthens your case:

• The child's school enrolment records showing your address
• GP registration at a surgery near your home
• A letter from the child's social worker confirming the placement
• A copy of your court order (SGO or CAO)
• Utility bills showing the child's presence in your household

Keep a dated record of when the child moved in. HMRC's investigation typically takes 4–12 weeks, during which the parent's payments are suspended. Once HMRC confirms the child lives with you, the benefit transfers.

What Happens When the Parent Won't Stop Claiming

Ask the parent to phone HMRC (0300 200 3100) to end their claim voluntarily — that's the quickest resolution. If they refuse or you can't reach them, submit your own CH2 claim stating the exact date you took on full-time care. HMRC opens the competing claim process automatically and writes to the parent. You don't need the parent's cooperation for your claim to succeed.

The 3-Month Backdating Limit

HMRC backdates Child Benefit by a maximum of three months from the date they receive your claim. If a grandchild moved in six months ago and you're only claiming now, you lose three months of payments permanently. This rule has no exceptions, regardless of the circumstances.

The practical takeaway: file your claim within days of the child arriving, even if you're still gathering documents. Submit what you have and supply the rest when HMRC asks.

Transferring NI Credits to Protect Your Pension

If you're under State Pension age and caring for a grandchild under 12, the Child Benefit claim itself earns you Class 3 NI credits. But there's a second route worth knowing: if a working parent claims Child Benefit for a different child in their household, they can transfer the NI credits from that claim to you using Form CA9176 (Specified Adult Childcare Credit). This is submitted after 31 October following the end of the tax year.

This matters most for grandparents who gave up work to care for a grandchild. For someone whose National Insurance record started after April 2016, each added qualifying year can increase the new State Pension by about £6.89 per week at 2026/27 rates, up to the full amount. Earlier National Insurance records can work differently.

Next Steps

Child Benefit is one piece of a larger financial picture. Depending on your legal arrangement — informal care, a Special Guardianship Order, or a Child Arrangements Order — you may also qualify for Universal Credit child elements, council allowances, and Guardian's Allowance. The arrangement you hold changes which payments are available and who pays them.

The Money for Kinship Carers in England guide maps every payment to every legal arrangement, with the exact forms and evidence each agency needs.

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