How would I buy a house for the back taxes

You check with your local county tax collector to find out when tax auctions occur.

But the likelihood of you getting a house just for back taxes is extremely small. If there is a mortgage against the property the lender will pay the taxes before it comes up for auction.

If a property gets to the auction, speculators will bid up the property if its in decent condition.

Yes, most of the nicer homes seldom sell for taxes and in most states you only buy the certificate and have to wait one to three years to redeem it.

But they are sold at auction at the courthouse