Line 437 (Total income tax deducted) is calculated by using the entries from your return. Return to each T slip entry and ensure that the box numbers and amounts match your T slips. If you are using the Forms method, double-clicking on line 437 will bring you directly to the T slips information.
If you are unable to find the error, please contact our support team for assistance. Here's how:
https://turbotax.community.intuit.ca/replies/3152013
