I lend on real property and I know what I'm looking at when someone shows me a deed and a survey. A certificate is a lien position with a redemption clock, and I have no idea how I would size a loan against that or what it even means if the clock runs out while my money is still in.
The borrower check is meaningfully different, and the clock issue you raised is the right thing to worry about.
When you lend against a tax lien certificate, the collateral is a legal claim on a property, not ownership of the property itself. The certificate holder has the right to collect the owed taxes plus statutory interest (the rate set by state law), and eventually the right to start a foreclosure process if the owner never pays. Your borrower owns that claim, not the property.
Sizing is harder for two reasons. First, the claim has a ceiling: the borrower can collect only the face amount of the lien plus the statutory interest rate, no more. If you lend close to that ceiling and the owner redeems early, your borrower gets paid out quickly, which is fine. If the owner never redeems, your borrower has to go through a formal foreclosure process, which varies a lot by state and can take one to three years. Your money sits locked in while that plays out.
Second, you cannot simply fall back on the property value the way you would with a deed. If the borrower defaults on your loan before the certificate resolves, you step into their position in the certificate, not into a deed. You would then need to complete the foreclosure yourself to reach the real estate. That is a procedurally specific process, and some states have strict deadlines that can extinguish the certificate if they are missed. A real estate attorney in the relevant state is the right person to map that timeline before you agree to terms.
The strategy guide's note that most liens redeem is relevant here: the more likely exit is a cash payoff within the redemption window, which may actually simplify your underwriting compared to the worst-case scenario.
What state is the certificate in? Redemption periods and foreclosure procedures differ enough that the state would change which risks matter most.
Lost $34k in Maricopa County 2021 when my borrower went dark at month eight.
Honestly I would not lend against a certificate at all, full stop. My money is in the note and the deed of trust, not in somebody else's lien position on a property I can't touch yet. If the clock runs out while you're in, you're not stepping into a deed, your borrower is, and then your collateral just changed shape without your permission. I've seen people try to structure around this in Duval County and Hillsborough and it always ends with a conversation about who controls the foreclosure timeline, and the answer is never the lender. Size the loan against something you can foreclose on yourself inside a timeline you control, or don't size it at all.
Sizing is the real problem, certificates in Cook County are moving at 60 to 70 cents on the lien face, not collateral value.
What's the borrower's plan if the owner redeems two weeks before the deed was supposed to drop? Does your borrower have runway to sit on dead capital or are they counting on that conversion to pay you back?
That's the part people miss. They underwrite the certificate fine and completely blow past the fact that their borrower needs that deed to fund the next deal.
