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Had same problem after filing basic tax return Turbo tax had a refund of $806 when filed to CRA refund was changed by them to $379 due to an error in calculating the total payable by Turbo Tac

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@Theadams  @Bars6944 Could you let us know if you used TurboTax Online or TurboTax Desktop/Download and what version was used?

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I used the desk top Turbo Tax Standard 

Thank you for this information. Please continue to follow the directions above as we look into things here.

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Good afternoon TurboTax Ginette!  I used TurboTax Desktop/Download Standard Version however I cannot find a version number on any of the documentation.  There is a SKU on the box #5107553 and I purchased it at Staples in Belleville.  I should also note that I have been using this Intuit product since it was still called Quicktax and have never had an issue even remotely close to this previously.  With a far more complex return to file I want to make sure that this year's version is accurate in order to take appropriate actions in regards to RRSP Contributions etc.  Obviously there is some urgency to this query due to the upcoming close of contributions date so any assistance you can offer to clarify this situation is greatly appreciated.

Thank you;

@Bars6944 @Theadams  When you get your full Notice of Assessment, it should say what the CRA has changed.

This is what the Notice of Assessment says

We changed your total payable from $2,604.61 to $3,075.35 because of a calculation error.