What is the NETFILE Access Code (NAC)?

The NETFILE Access Code (NAC) is an 8-character code that is used as an added security measure by Canada Revenue Agency (CRA) to verify your identity when you NETFILE your return.

New this year, you’ll be asked to enter your unique NAC in H&R Block's tax software. Entering your NAC in the tax software isn’t mandatory; you’ll still be able to NETFILE without it.

However, if you don’t enter it, you won’t be able to use any information from your 2023 tax return to confirm your identity with the CRA when you call them. You’ll need to use other information to authenticate your identity.

Note: The NAC doesn’t apply to you if you are filing your tax return for the first time.

Where can I find my NAC?

Where do I enter my NAC in H&R Block's tax software?

My return was rejected because of an incorrect NAC. What should I do?