As per the BC government; The BC government calculates the payment based on how much financial assistance you get from OAS and GIS. These amounts depend on the income you reported on your income tax the previous year. If you’re eligible, you’ll start to get the Senior’s Supplement one month after your first OAS/GIS payment.

You don't need to apply. Payment is automatic.

The BC's Seniors' Public Transit Tax Credit has been eliminated. 

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