Agent Dedicated Line: tax credits

Call HMRC about tax credits if you’re authorised to act as an agent or tax adviser for your client.

• From: HM Revenue & Customs
• Published: 14 May 2025
• Last updated: 30 June 2025
  Show all updates

  1. 30 June 2025

     The phone line opening times have changed from 8am to 6pm to 8am to 5pm.

  2. 14 May 2025

     First published.

Phone

Call HMRC for help with tax credits if you’re formally authorised to act on behalf of a client.

Telephone: 0345 300 3943

Opening times: Monday to Friday, 8am to 5pm. Closed bank holidays.

Find out about call charges

Related content

Guidance

• Dealing with tax credits for someone else
  
• HMRC services for tax agents

HMRC contacts

• Agent Dedicated Line: Self Assessment or PAYE for individuals
  
• Agent Dedicated Line: Debt Management
  
• Central Agent Authorisation Team