I prepared our taxes as "married filing jointly". We owe a substantial amount of tax (thousands). I ran the What-If Worksheet and checked the "MFJ vs MFS" box to see if it would make a difference. I noticed that we owe additional (0.09%) Medicare tax.
In the "Additional Taxes Smart Worksheet" section of the What-If form, column A correctly shows the Medicare Wages from box 5 of our W2 forms. However, in columns B, C and D, I believe the Medicare Wages to be incorrect. They are using the wages from box 1 of the W2 forms.
Can someone knowledgeable please advise if this is a form error?
Thanks.