You don’t need a code to NETFILE your taxes, but it will make filing your tax return easier. If you’ve filed a tax return with the CRA, you will find your NETFILE access code on last year’s Notice of Assessment (NOA), near the top right. Prior to filing your tax return with NETFILE, you will be asked for the access code after filling in your name, date of birth, and social insurance number. The access code will be made up of letters and numbers below the “Notice details” section of your assessment. While the code is not mandatory, it makes it easier to use information from your previous year’s tax return to confirm your identity. If you don’t have this code or decide not to use it, you will have to use other information for authentication. Please note, if you’re a first time filer, the access code does not apply to you.