I had 4 W2's in 2020 and overpaid social security tax by 8716.88, assuming social security limit is $8537 and I paid a total of $17,254. Why does turbotax say I owe 5k?

[DoninGA]

Assuming the W-2's entered were all from different employers with separate EIN's then your total tax payments, which include the excess SS taxes withheld, were not greater than you total tax liability, you have taxes owed.

Look at your tax return Form 1040

Click on Tax Tools on the left side of the screen. Click on Tools. Click on View Tax Summary. Click on Preview my 1040 on the left side of the screen.