Hi Lynnette,
For the past year and a half, I have been going to my local auctions and reading up on title reports related to foreclosures.
1. It depends on what State and County your Sheriff sale is in to say how it works.
In my County, all foreclosure auctions start bidding at 2/3rds the tax audited value. The banks come to the auction, or submit their bids, to the sheriff usually in the amount of what is owed to them. However, there really is no way to find out exactly how much that is unless the current owner tells you. You'll know you've hit it when the bank stops bidding at the auction.
Call your local Sheriff to ask how they set the Initial Bid Price. They'll be able to tell you.
2. You can, and should, do a little research to guestimate what the loan/equity might be.
Google "(Your County) Real Estate Auditor". Most counties have an system to search for properties to see who currently owns it, taxes due, past sales transfers, building permits, etc..
Look up your property and get the current Owner's name (or previous owner's name if it's now in the Bank's name).
3. Google "(Your County) Clerk of Courts dockets". That should bring you to the website where you can search Case Dockets by the foreclosed owner's name.
Search the owner's name to find their Foreclosure case. Within the Foreclosure case online documents, open the "Preliminary Judicial Report". This will show you a title report, and other details, usually much better than the Auction.com Title Report. I find reading the "Final Judicial Report" document can also be helpful. Judicial Reports give great information on their bank loan and any other recognized liens on the property.
4. Any debts/liens listed in the Foreclosure case's Judicial Reports are wiped clean from the title by Sheriff Sale (no matter if you or bank buys it) with one exception. If they have an IRS Lien, the IRS has the right to buy back the property from the auction winner at the price the auction winner paid for it for 90-120 days. However, unless the property went for $100k and is worth $1m, the IRS doesn't actually take advantage of this. You just won't have a "clean" title from it until the period is over.
If you find another Lien case for the foreclosed owner that is newer than the Preliminary Judicial Report's title search, that may be a lien that you inherit if you buy the property. Only the liens listed in the Foreclosure case are wiped clean.
If you read the Foreclosure case's "Preliminary Judicial Report" you'll be much more educated about the home loan and can better guess what is owed to the primary lien holder. Hope this helps!