@RafiS What likely happened is that when you put in your T4, TurboTax claimed the Canada Workers Benefit (CWB) (aka the Working Income Tax Benefit) for you. This is a refundable tax credit for people who work, but don’t make very much. However, students are usually not eligible for this credit, so when you added your tuition, then the CWB was removed, lowering your refund.
The Canada Workers Benefit and Canada Training Credit are two different things. The Canada training credit (CTC) is meant to help Canadians with the cost of eligible training fees.
