This year, the first $15,000,000 of an estate is exempt from federal taxes, so unless it is on top of a different $14,000,001 in estate net assets, the estate tax (a tax on the estate) on that $1,000,000 house is $0. [0]

Some U.S. states have an additional inheritance tax (payable by the inheritors). Those rules vary. [1]

[0] https://www.irs.gov/businesses/small-businesses-self-employe... [1] https://www.investopedia.com/terms/i/inheritancetax.asp