From CRA;
Line 438 - Tax transfer for residents of Quebec
If you were a resident of Quebec on December 31, 2017, and you earned income, such as employment income, outside Quebec during 2017, tax may have been deducted for a province or territory other than Quebec.
You can (emphasis added) transfer to the province of Quebec up to 45% of the income tax shown on information slips issued to you by payers outside Quebec.
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