In most states you have to attend the auction in order to bid, or have a representative there to bid on your behalf. But there are 2 ways that you can purchase a tax lien or deed without physically going to the sale. A few states do have online auctions, but not all counties in these states conduct their auctions online.
Usually just the larger counties do. Many counties in Florida, California, and Arizona have online tax sales. And I know that some counties in Colorado and Illinois have online tax sales as well.
Another way that investors have bought tax lien and tax deeds without going to the sale, is to bid on left-over liens, this can usually be done through the mail. The only problem is that as tax lien and tax deed investing become more popular, there are less and less good properties left-over after the tax sale. More.
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