How Colorado Tax Sales Work

Colorado gives every tax lien buyer in the state the same interest rate in a given year. Nobody bids it down, and nobody earns more than anyone else on the rate alone. What separates a good Colorado purchase from a bad one is the premium you pay above the taxes owed, because that premium earns nothing and never comes back.

A second thing to know before reading anything older: Colorado replaced its deed process in 2024. Guides that describe applying for a treasurer's deed and receiving the property are describing repealed procedure. The current rules span Article 11 for the sale, the newer Article 11.5 for the deed route, and Article 12 for redemption. County offices and dates are on the Colorado tax sales hub, with the buyer's steps in how to buy tax liens in Colorado.

Step 1: The auction runs by the second Monday in December

Section 39-11-109 requires the public auction of tax liens to commence on or before the second Monday in December each year. That is an outer bound rather than a fixed date, and most counties schedule earlier in the autumn. If a lien cannot be advertised and offered in time, 39-11-110 provides for a later auction. Confirm the exact date with the county treasurer, because the statute does not set one.

Step 2: Bidding runs up on price

Under 39-11-115 the tax lien goes to whoever pays the taxes, delinquent interest and fees due, or who further pays the largest amount in excess of that. So Colorado is a premium-bid state: competition raises the price rather than lowering the yield.

The same section decides what happens to that excess, and it is the number that governs a Colorado return: the excess amount is credited to the county general fund. You do not get it back at redemption and it earns nothing while you wait. Two bidders on identical parcels earn the same statutory interest on the same base, and the one who paid a bigger premium simply earns less on more money.

Because of that, calculate on the base rather than on what you paid. The tax lien yield calculator takes the base amount for exactly this reason.

Step 3: The rate is set annually, not bid

Colorado has no rate auction. Section 39-12-103 has the state Bank Commissioner set one statewide redemption rate each year, calculated as the federal discount rate plus nine percentage points and rounded to the nearest whole point. It is fixed every September 1 and takes effect the following October 1, so it can move from one sale year to the next.

The rate effective October 1, 2025 is 14%. Treat that as a figure with a shelf life: it resets each autumn, and the Division of Banking publishes the operative number.

There is no minimum-return floor, so the statutory minimum shows as 0%. The 8 percent figure often quoted for Colorado belongs to a different section, 39-12-111, which governs repayment when land was wrongfully sold. It has nothing to do with an ordinary redemption, and the Division of Banking lists the two rates separately.

Step 4: Redemption stays open until a deed actually issues

The owner may redeem at any time until a treasurer's deed is executed. There is no fixed cut-off date on the calendar, which is why Colorado redemption is described as 3 years from the tax lien sale before the certificate holder can apply for the deed auction rather than as a deadline the owner can miss by a day.

Interest runs monthly, and a portion of a month counts as a whole month, so short holds annualize above the headline rate. Place your own dates with the redemption deadline calculator.

Step 5: After three years, an auction rather than a deed

This is where Colorado now diverges from the way most people describe it. House Bill 24-1056 added Section 39-11-153, which states that on or after July 1, 2024 a treasurer shall not issue a deed under Article 11. The sections that used to govern that process are still printed in the code but are prefixed "Before July 1, 2024" and no longer operate. Any source citing 39-11-120 as current deed procedure is out of date.

What happens instead sits in Article 11.5. At least three years from the sale, the lawful holder may apply for a public auction of a certificate of option for a treasurer's deed. The minimum bid is what is owed to the holder plus the treasurer's costs. If the auction produces more than that, the overbid goes to junior lienholders in recording priority, and then to the property owner. The holder does not keep the surplus.

Colorado also made it an offence to charge an owner for recovering their own overbid: such an agreement is unenforceable, and the conduct is a class 2 misdemeanour. That is the state's answer to the same constitutional problem the Supreme Court identified in Tyler v. Hennepin County, and it is why tax deed surplus funds work differently here than in states that let a buyer keep the excess.

Step 6: The outer limit on the lien

Section 39-11-148 caps the life of the lien: no certificate remains a lien on the property for longer than 15 years after it was issued. That is generous compared with most states, but it is still an outer wall, and a lien allowed to sit for a decade has usually stopped being an investment.

Putting it together

Colorado is a rate-taker's market. You cannot out-bid your way to a better yield, only to a worse one, because every dollar of premium earns nothing and is gone for good. The realistic case is a steady statutory return on the base amount for as long as the owner takes to redeem. The property outcome is now an auction where you may simply be paid out, and where any surplus belongs to junior lienholders and the owner rather than to you. Bid the base, keep the premium small, and re-check the statutory rate each autumn.