What might have happened is that TurboTax claimed the Canada Workers Benefit (CWB) for you at first, however then you entered your T2202 information indicating that you are a full-time student. Full-time students are generally not eligible for the CWB, so it was removed and your refund decreased.

Thank you for choosing TurboTax.

Actually, the first time I did it, I arrived at the CWB screen and when I said no, it dropped the refund in the same amount. I scrapped that return and tried again, but didn’t get the CWB screen. Instead, it happened when I entered the tuition. In any event, why would it drop so significantly…it does make sense?

@gloworm3 The CWB can be up to $1,428 for a single person depending on your income (more if you are disabled). So, a large drop is quite common when the CWB is removed.