The amount of union dues or professional membership fees can be claimed under box 44 of your T4 slips.
To enter your information or proof about professional membership fees, please follow these steps:
1. Sign in your TurboTax online
2. Find the tax return you need to file, and click Continue
3. From the menu on the left, select Income, then click T-slips, and finally click T4 Employment Income
4. Here, you can add your T4 information (including your information/proof about professional membership fees)
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