I am having the same issue. I've used Turbotax for a long time and had been updating and reviewing over the last 2 weeks. Just recently this message is popping up saying that my employer will be sending me a W2-c because I deferred social security taxes last year. Not only did I not defer social security taxes last year, I actually overpaid into social security by $3,701 due to working at two different employers in 2019. Schedule 3 for Additional Credits and Payments for 2019 lists the $3,701 on line 11 for Excess social security and tier 1 RRTA tax withheld. This year for 2020 I've had only one employer the entire year and my box 3 for social security wages is maxed out at $137,700.00 and box 4 is 6.2% with an amount of $8,537.40. I did not file my return yet. It's great to hear that many think that this is a glitch in the software; although very unsettling and you would think Intuit/Turbotax would be all over this! I paid for the disc for turbotax premium from Costco. Turbotax needs to get on the ball and fix this with another update! They should also email a discount coupon code for the 2021 edition of Turbotax that we can apply to the purchase of next years disc for everyone who commented on this subject. We are all loyal Turbotax customers and "glitches" or flat out errors like this can happen; but if it is falling on deaf ears at Turbotax, and they don't fix this soon, I will seriously consider looking at different software when I file next year's return. This totally flies in the face of their saying "TurboTax has you covered"!
