As per the Canada Revenue Agency (CRA) ReFILE: Online adjustments for income tax and benefit returns ReFILE is an online service that lets individuals and EFILE service providers send online adjustments for income tax and benefit returns with certified NETFILE software and EFILE software. Individuals (NETFILE users) can use ReFILE to send adjustments for 2021, 2020, 2019 and 2018 returns.
To amend the other previous years please see the CRA page How to change a return?
Thank you for using TurboTax.
