what are the irmaa for 2020?
IRMAA 2020 New Premiums IRMAA now affects 7% of the Medicare population. For 2020, IRMAA is $144.60, an increase of $9.10 from $135.50 in 2019. The top bracket increases by $31.10. Note that this is a 6.7% increase for IRMAA while the COLA adjustment to social security is just 1.6%.