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What % of my SS income was taxed for my 2018 return?

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Level 15

What % of my SS income was taxed for my 2018 return?

The taxable amount is shown on line 5b of form 1040. The total amount of social security (from form SSA-1099 is shown on line 5a.  If lines 5a & 5b are blank, none of your SS was taxable. (assuming you entered the SSA-1099 correctly). 

When TurboTax (TT) prints out your return, it will provide you with the  IRS social security worksheet (abbreviated social sec on the forms list) showing you how the taxable amount was calculated.  Here’s a blank showing you how the calculation is done: (2018)

Social security only becomes taxable when added to sufficient other income. If you are otherwise required to file a tax return, you do need to enter it in Turbotax (TT). TT will determine the taxable portion.

For the first  $9,000 (12,000 MFJ), only 50% of your SS is taxed. After that 85% is taxed. And gradually the  50% taxed  is replaced with the 85%. It's the government; they make it complicated. See IRS Publication 915. 

Social security (including SSDI) becomes taxable when your income, including 1/2 your social security, reaches:

Married Filing Jointly(MFJ): $32,000

Single or head of household: $25,000

Married Filing Separately and lived with your spouse at any time during the tax year: $0

How much  is "sufficient other income"? The simple answer is $12,000 (a single person's filing requirement). But the answer varies dependent on marital status, filing status, age, the amount of your Social security, and whether you are claimed as a dependent by someone else.


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