You can file your tax return separately, and indicate you are common-law on each of your returns.  

For further information, please see the link below:

TurboTax Article: Facts Every Canadian Needs to Know About Filing Coupled Tax Returns.

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Yes, you can file your returns separately and indicate that you are common-law. 

In online versions of TurboTax, you can prepare your spouse or common law partner's tax return at the same time as yours. This is called a spousal/coupled return. If you’ve already started your return but haven’t indicated that you want to prepare together, you'll need to start a new return and indicate that you want to prepare your spouse or common-law partner’s return together with yours.

TurboTax FAQ on how to file a coupled return: How do I prepare a spousal or coupled return in TurboTax Online? 

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