I did not defer any social security taxes last year. I paid the maximum. But TT says "Heads Up! You have a W-2c coming" for defering SS taxes last year. WTF???

I received the same message, but I paid the maximum as well.  TT, why are we receiving this message?  

Me too.  Looks like a programming error involving W2 with income over the SS max limits.

Some folks are getting that if they also had a 1099-NEC form in addition to a W-2

IF not that...

could be a simple rounding difference in box 4.  Try adding 50cents to box 4 on any W2 that has nearly 50cents on the final digits and see if the  Warning/Notice (and that's all it is) still occurs.

IF it does, then that is what's going on...i.e. just a rounding difference between what your employer did, and what TTX did.

Then return box 4 to it's former # and ignore that notice/warning. 

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I tested my desktop software.....and for my test, in a situation where the 6.2% was close to $$$$.50..... a value of $$$$.49  in box 4 gave me the warning, and $$$$.50 did not....and that's all a rounding issue.

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Same result for me as well; this calculation should be pretty simple and TT should correct ASAP (unless Congress increased 2020's maximum tax retroactively!)