How much of my ss is taxable

No, your Medicare premiums flow from your SSA1099 to the Medical Expenses when you enter your SSA1099 onto your tax return.  Do not "double enter" them.  

Up to 85% of your Social Security benefits can be taxable.  There is no age limit for having to pay taxes on Social Security benefits if you have other sources of income along with the SS benefits.  When you have other income such as earnings from continuing to work, investment income, pensions, etc. up to 85% of your SS can be taxable. 

If Social Security is your only income, you do not have to file.

I have filled out my turbo tax and don't see how much of my ss is taxable!

You can confirm the amount that is taxable by previewing your 1040. 

Go into the black panel on the left and select Tax Tools. 

1. Then select Tools beneath Tax Tools. 
2. A "Tools Center" box will pop up, select "View Tax Summary" 
3. You will see a screen that gives a snapshot of your taxes based upon your input so far. 
4. Click on the black panel on the left bar and select "Preview my 1040". 
5. Scroll down the preview until you see Line 5a & 5b.
6. You will able to determine how much of your Social Security Income is taxable and nontaxable.

 After you review the above items, simply select "Back" in the black panel to get back to the interview forms.