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HMRC letter codes · Tax credits (TC)

TC603DAnnual Declaration 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 says TC603D is an Annual Declaration form. It asks the customer to complete their income and benefits details and to say about any changes of circumstances, for one tax year at a time.

“An Annual Declaration form asking the customer to complete their income and benefits details and to indicate any changes of circumstances for one tax year at a time.”

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 TC603D. Each fact has its source and the day it was checked beside it.

When HMRC sends it

HMRC’s Tax Credits Manual says that where a tax credits renewal could not be done automatically and a reply was needed, forms TC603R and TC603D (or TC603(D2)) were sent to the household.

“Reply required cases that cannot be automatically renewed … Forms TC603R and TC603D or TC603(D2) are issued to the household.”

HMRC Tax Credits Manual: TCM0258120, Renewals - notices · checked 14 October 2026

Free help and HMRC contacts

If you have a general question about your tax credits, such as one about a TC603D, 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.