I understood you to mean that seniors don't pay taxes on it, which in my parents and in-laws case is true (since they don't go over income thresholds to pay inc

I understood you to mean that seniors don't pay taxes on it, which in my parents and in-laws case is true (since they don't go over income thresholds to pay income tax). For seniors that are most affected by this (the ones with lower incomes), they probably don't pay tax.