What Tax must a widow pay on home sale?

10% tax

Lord knows what country (or universe) the previous responder was addressing...but obviously it isn't anyplace in the US.

There are many taxes one would have to pay on the sale of a home.

Your marital status makes no difference.

Some of the taxes may be based on the value of the home, while others are based on the amount of gain (meaning the amount above what you paid, plus certain improvements, etc). And most importantly, there are a number of generally applicable exemptions for the major Federal Taxes, if certain qualifications are met. (Like how many years you lived there before selling, etc.). While there are many considerations, the common ones are well known and certainly the lawyer you use to sell should be able to guide you for your circumstance.

It is normally a good time to consider and plan for things like Medicare limits (to assure you don't have to spend the house money before benefits kick in) and other plans.