Most people who qualify for Medicare Part A do not have to pay a premium, while all those who receive Medicare Part B must pay a monthly premium, reports Medicare.gov. The monthly premium payments for Medicare Part A and B are based on different criteria.
Those who qualify for Social Security benefits or Railroad Retirement Board benefits based on work credits earned receive premium-free Medicare Part A, according to Medicare.gov. Those without enough work credits must buy Medicare Part A for up to $407 per month as of 2015. The exact monthly amount people pay for Medicare Part A is based on the number of Social Security credits they accrue during employment. Most people who purchase Medicare Part A must also purchase Medicare Part B.
Everyone who enrolls in optional Medicare Part B must pay a monthly premium, reports Medicare.gov. Most people pay the minimum premium, which is $104.90 as of 2015, but some people pay more based upon their incomes. For instance, those with incomes of $85,000 or less pay the minimum premium, while those with incomes above $215,000 pay the maximum premium of $335.70. Those with incomes between these amounts pay incrementally higher premiums. The incomes of married couples filing joint tax returns are assessed together when determining Medicare Part B premiums.