The standard premium that most Medicare beneficiaries paid in 2012 was $99.90/month. Starting 2013, the standrd Part B premium will increase by $5/month to $104.90/month.
Higher income earners generally pay more based on prior taxable income.
Here are Part B premium the charts for 2012 and 2013:
| If your yearly income in 2010 was | You pay (in 2012) | |
|---|---|---|
| File individual tax return | File joint tax return | |
| $85,000 or less | $170,000 or less | $99.90 |
| above $85,000 up to $107,000 | above $170,000 up to $214,000 | $139.90 |
| above $107,000 up to $160,000 | above $214,000 up to $320,000 | $199.80 |
| above $160,000 up to $214,000 | above $320,000 up to $428,000 | $259.70 |
| If your yearly income in 2011 was | You pay (in 2013) | |
|---|---|---|
| File individual tax return | File joint tax return | |
| $85,000 or less | $170,000 or less | $104.90 |
| above $85,000 up to $107,000 | above $170,000 up to $214,000 | $146.90 |
| above $107,000 up to $160,000 | above $214,000 up to $320,000 | $209.80 |
| above $160,000 up to $214,000 | above $320,000 up to $428,000 | $272.70 |
| above $214,000 | above $428,000 | $335.70 |
Source: http://www.medicare.gov/your-medicare-costs/costs-at-a-glance/costs-at-glance.html