Florida has no state income tax, so of course FL did not tax your Social Security. But it is entirely possible that your Social Security was taxable on your federal tax return, if you had other sources of income along with the Social Security benefits.
Up to 85% of your Social Security benefits can be taxable on your federal tax return. 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.
What confuses people about this is that before you reach full retirement age, if you continue working while drawing SS, your benefits can be reduced if you earn over a certain limit. (For 2017 that limit is $16,920 —for 2018 it will be $17,040—for 2019 it will be $17,640) After full retirement age, no matter how much you continue to earn, your benefits are not reduced by your earnings; your employer will still have to withhold for Social Security and Medicare
https://ttlc.intuit.com/questions/1899144-is-my-social-security-income-taxable
For your 2017 tax return you can see how much of your Social Security was taxable on lines 20a and 20b of your Form 1040.
For 2018, the form has changed so look on lines 5a and 5b to see how much of your Social Security was taxable.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
