I mistakenly submitted information for tax returns for the year 2020 but I need to start in 2021. What should I do?

[TurboTaxSusan]

You should contact the Canada Revenue Agency (CRA) and let them know. 

If you are in Canada or the United States, you can call the CRA at 1-800-959-8281. If you are elsewhere, you can call 613-940-8495. This page has more ways to contact the CRA: Contact the Canada Revenue Agency 

Here is the URL for TurboTax Online 2021: https://ww1.2021.turbotaxonline.intuit.ca/?_swlg=en