If SS benefits are your ONLY income then you don't need to file a return at all UNLESS one or more of the following apply :
> you had insurance thru the ACA to report (form 1095-A)
> you have dependents to claim for a refundable credit
> you had federal withholding from the SS benefits
> you have some other refundable credits to claim (like EIC based off the 2019 earned income)
