You will go to the Income section of your return- T4E - edit and make sure that you never did put an overpayment amount in there. 

When Canada Revenue Agency (CRA) receives your tax return, it automatically calculates any overpayment and refunds it to you. Using TurboTax to file your return, any overpayment will automatically be calculated and entered on lines 448 for CPP and 450 for EI of the tax return.

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