Taxpayers calling the tax credits and self-assessment helplines can enrol for voice identification (voice ID).
The first time they call, the caller will be asked to repeat a vocal passphrase up to five times and then be passed back to an adviser to complete their call.
The recorded passphrase will be stored securely ready for use when the service goes live in a few weeks.
Callers can continue to use HMRC’s services in the usual way if they prefer.
Users of HMRC’s mobile app on Apple and Android devices can use fingerprint identification.