Where do I put Medicare benefits, B and C, deductions?

Those deductions are entered on the same page as your Social Security benefits.

To go to the section of the tax return to enter this information, use these steps:

• On the top row of the TurboTax online screen, click on Search (or for CD/downloaded TurboTax locate the search box in the upper right corner)
• This opens a box where you can type in “social security income” (be sure to enter exactly as shown here) and click the magnifying glass (or for CD/downloaded TurboTax, click Find)
• The search results will give you an option to “Jump to social security income”
• Click on the blue “Jump to social security income” link and enter your information