There is no such warnings in prior years for sure, I've always read all warnings carefully.
I was also reassessed for 2022 and 2023 tax returns for the CARE credit because TurboTax's auto-population failed to include my spouse's income on the form, despite we always filed jointly as a couple. what's worse is that in TurboTax (Standard desktop version) for 2022 and 2023 (at least, I didn't check prior years), ON479-A is not accessible by users, only ON479 is accessible but the CARE credit field is locked for editing and is fed from ON479-A, so even this error was discovered earlier it could not be manually fixed.
I see in 2024 this error still exist as default setting, but at least in 2024 ON479-A is accessible and you will need to manually check the box to add your spouse as a supporting person which will include his income in family income. in 2022 and 2023 TurboTax never asked any related question or warned users anything about ON479-A or the CARE credit, it just did everything in the background WRONG.
I've paid my tax owing and arrears interest and filed a interest relief application to CRA, which will take at least 6 months to process. if CRA denies my request, TurboTax should reimburse me and all users impacted the arrears interest, as it is totally due to defect in their software!
Please count me in if there's a class action against TurboTax for this issue!
