Flash info : UNTIL WHAT DATE CAN I CHANGE MY TAX RETURN?
Once your declaration has been received or is available online, you will be able to modify this statement through the online correction service. For the 2019 income tax return, the service has been available since August 2020.
After the online correction service closes (mid-December 2020), you will no longer be able to modify your return using the online correction service.
You will have to submit a claim. You then have until December 31, 2021 to do so online.
Feel free to contact us if you think there is an error in your tax notice and you want to request the correction.