2020 return - "Northen Residens/additional ded." Deduction - Origin?

[rvelasco]

My 2020 return includes a "Northen residents/additional ded." deduction. CRA is now requesting backup for this line item, and i don't know where it's coming from. I did not check any boxes for that.

[linhph178]

There is a chance your tax return includes this item is because the system recognizes that you are eligible for  the deduction through your address. For more information about Northern Residents Deduction, please check this article:  Understanding the Northern Residents Deduction.

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