Tax Year Prior to 2020: I have been a Realtor. I've never had "Self-Employment tax" amount calculated. Why is it being calculated now?

[KarenL2]

If you had a net profit from your self-employment, it should have been calculated.  Real estate professional who are paid with a 1099-MISC (rather than a W-2) file a Schedule C.  The net profit (over $400) is subject to self-employment taxes of 15.3%.   If you had a net profit on prior year tax returns, you may want to confirm that your income was reported on Schedule C.  Perhaps your expenses (such as high mileage) resulted in a net loss.  In that case, no self-employment taxes would have been calculated.