Off-payroll working (IR35): enquiries

Contact HMRC for help with enquiries about the off-payroll working rules.

• From: HM Revenue & Customs
• Published: 14 May 2025

Phone

Call HMRC for:

• help with enquiries about the off-payroll working rules
• a full run-through of the Check Employment Status for Tax (CEST) tool

You can also find out information in your business tax account.

Before you call

This helpline may ask you some security questions. Make sure your personal details and address are up to date in your personal tax account or you could fail telephone security. If you do not have a personal tax account, you can create one before you check your details.

Telephone: 0300 123 2326

Opening times: Monday to Friday, 8:30am to 4:30pm. Closed bank holidays.

Find out about call charges

Post

Write to HMRC for help with enquiries about the off-payroll working rules.

HM Revenue and Customs
IR35 Customer Service Unit
S0733
Newcastle Upon Tyne
NE98 1ZZ
United Kingdom

Related content

Guidance

• Understanding off-payroll working (IR35)
  
• Check if you’re an employment intermediary

HMRC contacts

• Employment status: enquiries

Published 14 May 2025