HMRC letter codes · Child Benefit (CH)
CH24AAsk for a Child Benefit or Guardian's Allowance decision to be looked at again
Last reviewed 14 October 2026 · How Tax Letters checks its facts
In short
GOV.UK says form CH24A is used to ask the Child Benefit office to reconsider a Child Benefit or Guardian's Allowance decision.
“Use form CH24A to ask the Child Benefit office to reconsider a Child Benefit or Guardian's Allowance decision.”
GOV.UK: Ask us to reconsider a Child Benefit or Guardian's Allowance decision · checked 14 October 2026
Information, not advice: this page reports what HMRC, GOV.UK and the bodies named publish about CH24A. Each fact has its source and the day it was checked beside it.
What it asks
GOV.UK's page for form CH24A says you will need your National Insurance number to fill in the form.
“You’ll need your National Insurance number to fill in the form.”
GOV.UK: Ask us to reconsider a Child Benefit or Guardian's Allowance decision · checked 14 October 2026
Time limits and rules
GOV.UK's page for form CH24A says you usually need to make your request within one month of the original decision.
“You usually need to make your request within one month of the original decision.”
GOV.UK: Ask us to reconsider a Child Benefit or Guardian's Allowance decision · checked 14 October 2026
How to send it or apply
GOV.UK says the CH24A is a postal form: print it, fill it in by hand and post it to HMRC.
“Print the postal form, fill in by hand and post to HMRC.”
GOV.UK: Ask us to reconsider a Child Benefit or Guardian's Allowance decision · checked 14 October 2026
Free help and HMRC contacts
If you cannot find the answer in the official HMRC app, GOV.UK says to call HMRC on 0300 200 3100 with a question about Child Benefit, including one about a CH24A decision. Lines are open Monday to Friday, 8am to 6pm, closed bank holidays, and GOV.UK links to its call charges page.
“Call HMRC if you have a question about Child Benefit and you cannot find an answer in the official HMRC app. … Telephone: 0300 200 3100 … Opening times: Monday to Friday, 8am to 6pm. Closed bank holidays. … Find out about call charges”
GOV.UK: Child Benefit: enquiries · checked 14 October 2026
Free help first
These routes are described by GOV.UK, TaxAid and Citizens Advice themselves.
- HMRC's extra supportHMRC offers extra support if your health condition or personal circumstances make it difficult to contact HMRC, for example a mental health condition, financial hardship or being treated in hospital.
- Someone to deal with HMRC for youYou can authorise a friend, relative or voluntary organisation to talk to HMRC for you and help you fill in forms.
- TaxAidTaxAid helps people with tax problems who cannot pay for advice. Tax Help for Older People merged with TaxAid in July 2025.
- Citizens AdviceCitizens Advice gives confidential advice online, over the phone and in person, for free.
- GOV.UK: Ask us to reconsider a Child Benefit or Guardian's Allowance decision (checked 14 Oct 2026)
- GOV.UK: Child Benefit: enquiries (checked 14 Oct 2026)
- GOV.UK: Get help from HMRC if you need extra support (checked 7 Oct 2026)
- GOV.UK: Appoint someone to deal with HMRC on your behalf (checked 7 Oct 2026)
- TaxAid: About us (checked 8 Oct 2026)
- Citizens Advice: About us (checked 7 Oct 2026)