Amounts transferred from your spouse or common-law...

Credits and deductions

Amounts transferred from your spouse or common-law partner. If your spouse or common-law partner does not need to claim some or all of certain non-refundable tax credits to reduce his or her federal tax to zero, you may be able to transfer those unused amounts to your return.

Things like CPP & EI premiums paid are not transferable in any situation.

Other credits are like the age amount - you can use leftover amounts. Still other credits like medical expenses and donations can be claimed entirely by one spouse or the other.

Here is a link to CRA which will help you!

When doing a coupled return using TurboTax it always looks for the best return possible return for you!

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