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HMRC letter codes · Tax credits (TC)

TC600Tax credits claim form

Last reviewed 14 October 2026 · How Tax Letters checks its facts

GOV.UK says tax credits ended on 5 April 2025 and no more payments will be made.

GOV.UK: Tax credits: general enquiries · checked 14 October 2026

In short

HMRC's Tax Credits Manual lists TC600 as the tax credit claim form and supporting notes.

“Tax credit claim form and supporting notes.”

HMRC Tax Credits Manual: TCM0316020, Extra information: forms · checked 14 October 2026

Information, not advice: this page reports what HMRC, GOV.UK and the bodies named publish about TC600. Each fact has its source and the day it was checked beside it.

What it asks

HMRC's Tax Credits Manual lists TC600a as the additional pages of the TC600 claim form. The customer completes them where there are more than two children in the household or more than one childcare provider.

“Tax Credit claim form additional pages … They’re completed by the customer where there are more than two children in the household or there’s more than one childcare provider.”

HMRC Tax Credits Manual: TCM0316020, Extra information: forms · checked 14 October 2026

Time limits and rules

GOV.UK says you cannot make a new claim for Child Tax Credit or Working Tax Credit, the claim the TC600 form was for, and that you may be able to get Universal Credit or Pension Credit instead.

“You cannot make a new claim for Child Tax Credit or Working Tax Credit. … You may be able to get Universal Credit or Pension Credit instead.”

GOV.UK: Tax credits ended on 5 April 2025 · checked 14 October 2026

Free help and HMRC contacts

If you have a general question about your tax credits, such as one about a TC600, GOV.UK says to call HMRC on 0300 322 9129. Lines are open Monday to Friday, 8am to 5pm, and GOV.UK links to “Find out about call charges”.

“if you have a general enquiry about your tax credits … Telephone: 0300 322 9129 … Opening times: Monday to Friday, 8am to 5pm. … Find out about call charges”

GOV.UK: Tax credits: general 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.