Did the Notice Of Assessment not say why you must pay the amount? This FAQ talks about why your Notice Of Assessment different from what TurboTax calculated, and how to figure out what happened: https://turbotax.community.intuit.ca/community/after-you-file-questions/help/why-is-the-refund-or-ba...
You can also contact our phone support to help you with this issue. You can get the correct number by using this form: https://support.turbotax.intuit.ca/contact/
If you have TurboTax Live Assist & Review, here is how to talk to a Tax Expert: https://turbotax.community.intuit.ca/community/navigating-turbotax/help/i-m-using-turbotax-live-assi...
