How Much Is Medicare Part B Premium For 2013? 
Higher income individuals may pay a penalty . In determining your penalty premium , Medicare considers your income from prior tax returns -LRB- from 2 years ago -RRB- . The penalty plus base premium is graduated based on income and can be as much as $ 335 in 2013 . Currently about 5 % of the population pays a Medicare Part B penalty . This figure is expected to rise over the next few years to roughly 14 % of the population . 