Revolutionizing · Modernizing · Simplifying
Revolutionizing · Modernizing · Simplifying
The single largest unpaid property tax bill in Denver right now belongs to a hotel. Not a shuttered strip mall, not some forgotten vacant lot. As of September 2026, the biggest delinquent bill in the city corresponded to the Denver Marriott Tech Center sitting right there in the DTC.
So that tells you something. When the hotel falls behind, regular homeowners are definitely feeling it too.
BusinessDen reported on Oct. 12 that unpaid property taxes in Denver are skyrocketing, and the city's annual tax lien auction, in their words, "is getting bigger and bigger." That is the story most people are not watching closely. But if you own in this city, you should be, because the mechanics of what happens when you fall behind are harsher than most folks realize.
Here is the part people miss. For a couple of years, Colorado ran a temporary property tax relief program that knocked down taxable values by up to $55,000 per home. It softened the blow. It also expired at the end of 2025.
So 2026 is the first full bill without that cushion. And the numbers moved. One Arapahoe County homeowner saw their bill climb from $3,877 to $5,435 over two years. That is nearly a 40% jump. I mean, that is real money, that is a car payment, that is a mortgage escrow shock that shows up and ruins your month.
When bills jump that fast, more people fall behind. That is just math. And that is why the delinquent list keeps swelling.
This is where it gets serious, so buckle up.
Taxes in Colorado are assessed against the property, not the person. Read that again. The debt sticks to the house, not to you. So the county has a very clean way to collect: they sell the right to your debt to an investor.
Unpaid taxes start accruing delinquent interest at 1% per month the moment you are late. A delinquency notice goes out in July. Then the list gets advertised in The Denver Post before the sale, which is its own special kind of public embarrassment.
Denver posted its 2026 delinquent list online starting Oct. 12. Owners had until 3:30 p.m. on Friday, Oct. 30 to pay up and keep their parcel out of the sale. That was the off-ramp. Miss it, and you are in the auction.
The sale runs online through a platform called Real Auction, in one-hour batches. It kicked off Nov. 2 at 8 a.m. and wrapped Nov. 4 at noon.
Investors who wanted in had to register and post deposits by 2 p.m. on Oct. 26. Each bidder puts down 10% of the total dollar amount of liens they expect to win. Bids move in
So an investor buys the lien. They are basically paying your tax bill for you. And in exchange, they get a certificate and a shot at one of the best legal interest rates in the state.
Here is the number that should get your attention.
The 2026 redemption interest rate for liens sold this November is 13% annually. That breaks down to 1.08333% per month. The rate is not random, it is set as the Federal Reserve discount rate on Sept. 1 (which was 3.75%) plus 9%.
So if your lien gets bought and you want your house clear of it, you redeem. Redeeming means paying the face value of the lien, plus that 13% redemption interest, plus a $7 redemption fee, plus a $5-per-year subsequent endorsement fee.
And here is the thing that makes it stack. The certificate holder can pay your later years too, the taxes you miss next year and the year after, and add them right onto the lien. So the balance keeps growing. The longer you ignore it, the bigger the hole.
Now, losing your house does not happen overnight. There is a clock, and it is a slow one.
A certificate holder cannot even apply for a treasurer's deed until three years after the sale. For liens sold this November, that door does not open until November 2029. And certificates stay valid for up to 15 years, so a patient investor can just sit and collect that 13% for a long time.
But make no mistake about what sits at the end of that three-year clock. A treasurer's deed means somebody else owns your property for the cost of your back taxes. That is the worst-case ending, and it is real.
Most people do not realize how the whole thing moves until they are already on the list. So the move is simple. Watch your bill, especially now that the relief program is gone and values reset harder. If you are behind, the county would rather work with you than auction you, and paying before that late-October deadline keeps you out of the sale entirely.
Property taxes are not the fun part of owning in Colorado. But they are the part that can quietly cost you the whole house. If you ask me, that is worth your attention a lot more than whatever is trending on your feed this week.
And if you are staring at a bill that does not make sense and wondering what your place is actually worth in this market, that is exactly the kind of conversation we have at Symbio Homes every day. Hayley and I have watched these numbers move for years. The clock is real. Do not let it run on you.