Q. Doesn't being full retirement age mean anything?
A. No.
Q. Why is $27,174 of the social security taxable?
A. That's the calculated amount, in your case; somewhere between 50% and 85% of your social security payments. See the social security worksheet for calculation details.
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.
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
After TurboTax (TT) calculates the taxable portion of SS, it puts the total amount of SS on line 6a of form 1040 and the taxable amount on line 6b (2020-2). TT also produces a worksheet to show how the taxable amount is calculated. Although most people pay tax on 85% of their SS. it can be less for lower income taxpayers.
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. When TT prints out your return, it will provide you with the IRS social security worksheet showing you how the taxable amount was calculated. See the worksheet at page 14 at
https://www.irs.gov/pub/irs-pdf/p915.pdf
