Help someone with their tax online

Register as a ‘trusted helper’ so that you can help a friend or relative with their tax. You’ll be able to access their tax online for them.

The person you’re helping must then use the service to accept your registration.

You can be a trusted helper for up to 5 people.

The person you’re helping will still be legally responsible for their own tax.

You’ll need the other person’s:

  • first and last name
  • National Insurance number
  • date of birth

You can currently only update someone’s company car details or view their Income Tax estimate with the trusted helpers service. More services will be available in the future.


Call HMRC on someone else’s behalf

You must be in the same room as the person you’re helping if you call HMRC for them, even if you’re their trusted helper.

HMRC will confirm their identity and check that they’re happy for you to represent them.

You must have their National Insurance number or tax reference number when you call.

You must be over 16 if you’re interpreting for a non-English speaker. HMRC’s helplines also have foreign language services.

Read guidance on HMRC Services if you or the person you’re helping has a disability.