Lots of myths on this "tax". First, it is not called a sales tax. It is called a Medicare tax. To me a tax is a tax no matter what you call it. The tax money goes into the Medicare Trust Fund. Let me make something very clear. There are NO trust funds, NO lock boxes! They are just IOU's. The money for these funds is used to pay the current bills.
If your individual adjusted gross income is less the $200,000 then this tax does not apply to you. If you are married and file a joint tax return then the threshold is $250,000.
Also the up to $500,000 exclusion of gain from a home sale for married couples filing jointly has not been eliminated. Tax and mortgage interest deductions still apply. So far nothing has changed for this income group. You have to have owned your home for five years and live in it for two years.
So when does this "tax" kick in? Your profit on your home is $600,000 and your income is $350,000. Capital gains kicks in on the $100,000 profit. $100,000 X 15% = $15,000. Your income exceeds the limits. your profit is $100,000. The difference between the income threshold limit is $100,000. $100,000 X 3.8% = $3800 in additional taxes.
Time will tell what will actually happen but this is how it translates today.