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 — See all updates

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

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.