@collinsc211 Cost basis may or may not be the same. Proceeds are not the total sale price-remember the mortgage payoff.
You need more information. You should get the HUD statement for the sale and you should have an idea of the fair market value at the time of your mother's death. That plus your closing costs are your basis.
If it was sold while still in your mother's name you should have received a K-1 not a 1099-S
Disclaimer: Not a tax professional. Information gathered from internet links. Anything dated in June 2019 was posted in prior years and is before the 2019 limits and changes.
