HMRC letter codes · Child Benefit (CH)
Child Benefit (CH) forms, explained by code
Last reviewed 14 October 2026 · How Tax Letters checks its facts
Codes on HMRC's Child Benefit forms, starting CH. Each code page reports what HMRC, GOV.UK or a recognised body publishes about it, with the source and the day it was checked beside each fact.
Every Child Benefit (CH) code
- CH2 Child Benefit claim formGOV.UK says Child Benefit form CH2 is the form to use if you cannot claim Child Benefit online.
- CH24A Ask for a Child Benefit or Guardian's Allowance decision to be looked at againGOV.UK says form CH24A is used to ask the Child Benefit office to reconsider a Child Benefit or Guardian's Allowance decision.
- CH105 Allow someone to help you with your Child BenefitGOV.UK says to use form CH105 if you want an intermediary, such as Citizens Advice, to help you with your Child Benefit.
- CH995 Authorise a tax adviser for the High Income Child Benefit ChargeGOV.UK says form CH995 is used to allow a tax adviser or accountant to act on your behalf for High Income Child Benefit Charge issues.
- CH459 Tell HMRC your child has left education or trainingGOV.UK says the CH459 online service is used to tell the Child Benefit Office that your child aged 16 or over has left approved education or training.
- CH299 Apply for extended Child BenefitGOV.UK says the CH299 online service is used to apply for an extension of Child Benefit if your child's under 18 and has left approved education or training.
- CH193 Tell HMRC a child is looked after by a local authorityGOV.UK says form CH193 is for a local authority (the council) to use, to tell the Child Benefit office that a child is being looked after by a local authority for 8 weeks or more.
Information, not advice: these pages report what HMRC and GOV.UK say about each code. Your own letter comes first.
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.
Other series
- Self Assessment (SA)SA1, SA401, SA250, SA316, SA100 and more
- Corporation Tax (CT)CT600, CT603, CT41G, CT41G (Clubs), CT208 and more
- VATVAT1, VAT1A, VAT1B, VAT2, VAT7 and more
- National Insurance (CA)CA5603, CA5403, CA2490, CA4361, CA72A and more
- Tax credits (TC)TC600, TC602, TC603D, TC603R, TC603UR and more
- Debt and payment letters (IDMS)IDMS99, IDMS99P, OCA43
- One-to-many lettersNISPAR1MM, LCL2REG2MM, CompC1LPLRMM, CompC1LPLR(A)MM, HEIPO2MM and more
- Compliance check factsheets (CC/FS)The factsheets HMRC's compliance letters name.
- Every HMRC letter codeAll the series on one page.
- GOV.UK: Claim Child Benefit if you cannot claim online (checked 14 Oct 2026)
- 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: Child Benefit: allow someone to help you with your award (CH105) (checked 14 Oct 2026)
- GOV.UK: Claim and deal with Child Benefit for someone else (checked 14 Oct 2026)
- GOV.UK: Authorise an adviser to deal with your High Income Child Benefit Charge (checked 14 Oct 2026)
- GOV.UK: Tell the Child Benefit office that your child has left education (checked 14 Oct 2026)
- GOV.UK: Apply for extension to Child Benefit (checked 14 Oct 2026)
- GOV.UK: Tell the Child Benefit office about a child being looked after by a local authority (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)