TTX guarantees the mathematical accuracy of the return, based on the data entered and the selections made by the user. If the user entered the wrong data or made an incorrect selection, that's on the user. However, if there is in fact a mathematical error in the program, you can start the claim filing process by following the guidance at https://turbotax.community.intuit.ca/turbotax-support/en-ca/help-article/tax-return/submit-claim-tur...
