To Buy Property at a Tax Sale, you have to Contact your county tax office, or the county of the property you want to buy for dates and times of the next tax sale. After that, Visit county tax office in person or online to pick up or download an auction application form as well as any other paperwork required to participate in the auction. Then, determine what kind of auction you are participating in. Next, get a certification of funds available from your bank or any other financial documentation required by your specific auction. Forth, Attend the auction and go through the bidding process.