There is no box 16 on my 1099-R form. What do I do?

If you have CSA 1099-R for U.S. Government Civil Service retiree annuity please verify that you selected the right Form in TurboTax. If you selected a regular Form 1099-R then you will have to delete the Form 1099-R and then add Form CSA 1099-R:

1. Login to your TurboTax Account 
2. Click on the "Search" on the top right and type “1099-R”
3. Click on “Jump to 1099-R”  and delete Form 1099-R and click “add another 1099-R”
4. On the "Who gave you a 1099-R?" screen select "Office of Personnel Management (CSA 1099-R) For U.S. Government Civil Service retiree annuity"

I have the same situation, and have for multiple years.   It is a regular 1099-R form, and there is no box 16.