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Program will not except OAS amounts. Keeps highlighting neg. amount from box 21 on T4A

 
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Program will not except OAS amounts. Keeps highlighting neg. amount from box 21 on T4A

Ensure you've entered your OAS income on the T4A(OAS) screen. 

Box 21 is for net supplements made and should be changed to zero if it is.

https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-re...