Walking into your first tax auction can feel overwhelming. Whether it is an online sale or an in-person event at the county courthouse, knowing how the bidding process works gives you a serious advantage over unprepared investors.
Here is what to expect and how to navigate both formats.
Before the Auction: Registration
Every tax auction requires registration, and the requirements vary by county:
In-person auctions:
- ›Register at the county treasurer or tax collector office, sometimes weeks in advance
- ›Provide a valid photo ID and taxpayer identification number
- ›Pay a registration deposit (typically $500 to $5,000, refundable if you do not win anything)
- ›Some counties require certified checks or cashier checks only... no personal checks or credit cards
Online auctions:
- ›Create an account on the auction platform (Bid4Assets, GovEase, RealAuction, etc.)
- ›Submit identification documents for verification
- ›Provide payment information and authorize a deposit hold
- ›Complete registration before the deadline (often 1 to 2 weeks before the sale)
Do not wait until the last minute to register. Technical issues, document verification delays, or missing the deadline can lock you out of the auction entirely.
How Bidding Works: The 3 Main Formats
Not all tax auctions work the same way. Understanding the bidding format for your target county is critical.
Format 1: Bid Up the Price (Premium Bidding)
This is the simplest format and the most common for tax deed sales. The auction starts at a minimum bid (usually the total taxes, penalties, interest, and fees owed), and investors bid the price up.
How it works:
- ›County sets a minimum opening bid
- ›Investors bid increasing amounts
- ›Highest bidder wins
- ›The county keeps the amount owed, and any excess (the overbid or surplus) may go to the former property owner depending on state law
Strategy tip: Set your maximum bid before the auction starts. Base it on your property research and target profit margin. When the bidding passes your maximum... stop. There will always be another auction and another property.
This format is used in many California, Georgia, and Michigan tax deed sales.
Format 2: Bid Down the Interest Rate
This is the most common format for tax lien certificate sales. Instead of bidding up a price, investors bid down the interest rate they are willing to accept.
How it works:
- ›The auction starts at the maximum statutory interest rate (e.g., 18% in Florida)
- ›Investors bid lower and lower interest rates
- ›The investor willing to accept the lowest interest rate wins the lien
- ›You pay the full amount of delinquent taxes and receive a certificate at the winning rate
Strategy tip: Know your minimum acceptable return before the auction. In competitive Florida counties, rates can drop to 0.25% or less. At that point, you are essentially making an interest-free loan to the property owner. Only bid that low if the property is extremely likely to redeem and you are comfortable with the minimal return.
This format is standard in Florida, Arizona, and several other lien states.
Format 3: Bid Down the Ownership (Illinois Penalty System)
Illinois uses a unique system. Instead of bidding down an interest rate, investors bid the percentage of the property they are willing to forfeit if the owner redeems.
How it works:
- ›The statutory penalty is set (e.g., 18% per 6 months)
- ›Investors bid a percentage of the property penalty they will accept
- ›The investor bidding the lowest penalty percentage wins
- ›If the owner redeems, the investor receives the taxes paid plus the bid penalty percentage
This system is more complex than the others and takes practice to understand. New investors in Illinois should attend several auctions as observers before bidding.
In-Person Auction Day
If you are attending a courthouse auction, here is what to expect:
Arrive early. The best seats (yes, seating matters) go to early arrivals. You want to be able to see and hear the auctioneer clearly.
Bring your research. Have your property list, maximum bids, and notes organized. Things move fast at live auctions... you do not want to be flipping through papers trying to find your research on a property that is about to sell.
Bring proper funds. Most in-person auctions require immediate payment or payment within 24 to 48 hours. Certified checks, cashier checks, or wire transfers are typical. Ask the county about accepted payment methods before auction day.
Stay disciplined. Live auctions have an energy that can push you to overbid. The auctioneer job is to get the highest price. Your job is to stick to your numbers.
Take notes. Write down what sells and for how much. This data is valuable for future auctions... it tells you what the competition looks like in this county.
Online Auction Tips
Online tax auctions have different dynamics:
Most are not real-time. Many online tax auctions use a proxy bidding system (like eBay). You enter your maximum bid, and the system bids incrementally on your behalf up to your maximum.
Watch for bid extensions. Most platforms extend the auction by a few minutes if a bid comes in near the deadline. This prevents last-second sniping and can extend auctions longer than expected.
Test the platform beforehand. Log in early, familiarize yourself with the interface, and make sure your payment method is working. Technical problems during bidding are frustrating and costly.
Factor in the buyer premium. Most online platforms charge a 5% to 10% buyer premium on top of your winning bid. Include this in your maximum bid calculations.
Bid on multiple properties. Online auctions make it easy to bid on many properties across different counties. Diversification is easier online than in person.
What Happens After You Win
For tax lien certificates:
- ›You pay the full amount of delinquent taxes
- ›You receive a certificate (physical or digital) documenting your lien
- ›The redemption period begins
- ›Track your calendar for subsequent tax payment deadlines and redemption period expiration
For tax deeds:
- ›You pay your winning bid amount (plus buyer premium if applicable)
- ›The county issues a tax deed in your name
- ›You are now the legal owner, subject to any applicable redemption period
- ›Start the quiet title process immediately if you plan to sell or finance the property
Payment deadlines are strict. If you win and fail to pay within the required timeframe (often 24 to 72 hours), you forfeit your deposit and may be banned from future auctions.
Bidding Strategies That Work
1. Start with less popular properties. The biggest crowds gather for the most desirable properties. Less competitive bidding on smaller or less obvious properties can yield better returns.
2. Target rural counties. Metro-area auctions in places like Maricopa County (Arizona) or Miami-Dade (Florida) attract institutional investors with deep pockets. Smaller counties in Indiana, Iowa, or South Carolina often have fewer competitors.
3. Buy in bulk at smaller auctions. At less popular auctions, you might be 1 of only a few bidders. This is where you can acquire liens or deeds near the minimum bid.
4. Track auction results. Keep a database of what sold and for how much at every auction you attend or monitor. Over time, patterns emerge that inform your strategy.
5. Build relationships. At in-person auctions, other investors are a source of knowledge. Many are willing to share tips about county-specific processes and quirks.
Your First Auction Checklist
- ›[ ] Registered with the county or online platform
- ›[ ] Deposit submitted
- ›[ ] Research complete on all target properties
- ›[ ] Maximum bids set for each property
- ›[ ] Payment method arranged (certified funds if in-person)
- ›[ ] Understood the bidding format (premium, bid-down, or other)
- ›[ ] Reviewed the auction rules and terms of sale
- ›[ ] Calendar reminders set for important post-auction deadlines
Recommended Reading
- ›
Profit by Investing in Real Estate Tax Liens by Larry Loftis -- Excellent coverage of auction strategies and bidding techniques for tax lien sales. Includes real examples from auctions in multiple states and practical advice for first-time bidders.
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The Complete Guide to Investing in Real Estate Tax Liens and Deeds by Alan Northcott -- Covers both online and in-person auction formats with step-by-step instructions. Good reference for understanding the different bidding systems used across states.
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Tax Lien Investing Secrets by Joanne Musa -- Includes modern strategies for online auction platforms and tips for competing effectively in both high-competition and low-competition markets.