Hi there, I am working on my tax return. My estimated tax return went down dramatically after entering school. I want to know why.

[TurboTaxJeffrey · Accepted solution]

Without the school information, your income I suspect was in the range that you qualified for the Working Income Tax Benefit.  If you were in school full time for at least 13 weeks, then you are not entitled to this credit. 

http://www.cra-arc.gc.ca/bnfts/wtb/fq_qlfyng-eng.html#q2