The reference number allows you to access your tax data and your draft declaration, and its subsequent processing.

We recommend that you obtain the reference from the app of the Tax Agency , which allows for easier access to the most commonly used services throughout the Income Tax campaign. However, you can also obtain the reference number online at the Tax Agency's electronic headquarters, using the RENØ service with box 505 of your 2020 declaration, with Cl@ve PIN or with an electronic certificate or electronic DNI.

In the video we show you how to obtain the reference number with box 505: