If you verified everything you had entered in TurboTax against what was on your Notice of Assessment and you see an issue please submit a claim under the TurboTax 100% calculation guarantee.

How do I submit a claim under the TurboTax 100% Accurate, Expert Approved Guarantee?

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Thanks for your prompt reply.  I received your reply.  I read the instructions on how to submit a claim for the interest charged by CRA.  I purchased my TurboTax software by download.  So, according to instructions I have to contact customer service.  I will contact them tomorrow Monday the 30th.

Did you ever get to the bottom of your issue - that is, why it happened??

I discovered when doing the 2024 taxes for my husband and myself that if you income split, TurboTax automatically moves some of your income tax paid credit to the other person as well.  That is, I transferred income to my husband, and TurboTax proceeded to reduce my taxes paid credit and increase his by the same amount.  Then of course neither return matches up with the T slips, so it is red-flagged at CRA for re-assessment.

TurboTax has known of this problem for at least 2 years and has failed to fix it.  Oh - and you cannot override this action, if you can even figure out what happened...I say that because the "help" person I talked to at length did not have a clue and suggested that I call the CRA.  When I pointed out it was a problem in TurboTax, not CRA, she hung up on me.  With help from another post on here, I did figure it out, to the penny.

Anyway, if you income split with your wife, that may be the source of the problem.