TurboTax 2018 thinks that the maximum Social Security tax employee contribution for 2018 is $7,960.80. Multiple sources indicate 6.2% x $128,700 = $7,979.40?
Unfortunately, I couldn't find Intuit's forms for submitting bug reports. I guess they figure they don't need it.
wrapper version 018.000.0109
WinPerReleaseEngine version 018.000.0250
WinPerFedFormset version 018.000.1162
WinPerTaxSupport version 018.000.0113