Jefferson County

Registering with SRI: October 19 to November 10

Registration happens on Zeus Auction, not at the treasurer's office in Golden. It opens on October 19 and the last day is November 10, 2026. Returning bidders log in, update their account information and register for the Jefferson County sale specifically; new bidders create an account and activate it from the confirmation email first. Only bidders with a U.S. taxpayer ID number can take part, and SRI answers questions at 800-800-9588, weekdays 8 a.m. to 5 p.m. Eastern.

Your registration details become the certificate. You complete an IRS W-9 during registration, and the county will not issue a certificate in any name other than the one on that W-9, so enter it exactly as you want it to read. Your Social Security number is used only for the 1099 reporting on certificates redeemed each year.

Payment is an ACH debit from the bank account you registered, made through the auction company, and you must make sure the money is there. If you do not pay, you lose the liens you won and are barred from all future auctions on the site. Colorado law also lets the treasurer bar a non-paying bidder for up to five years (C.R.S. 39-11-116).

How the online bidding works

Parcels are offered and bid in property identification number (PIN) order, online only. The first bid must meet the parcel's minimum; after that, bids rise by the set increment. You can enter a proxy bid: the most you are willing to pay, which the system defends for you by bidding the lowest amount needed. Each item closes when the system shows "bidding is closing", and the highest bid at that moment wins. A bid cannot be lowered or cancelled once placed.

What you are bidding up is the premium, the amount you pay above the taxes, delinquent interest and costs. Jefferson County is explicit that the premium earns no interest and is not repaid when the owner redeems; by statute it goes to the county general fund (C.R.S. 39-11-115(1)). Interest is earned only on the certificate's face amount.

13% for the life of the certificate

Colorado sets the rate each September 1 at nine points above the federal discount rate, rounded to the nearest whole percent (C.R.S. 39-12-103(3)). For liens sold in 2026 it is 13%, and Jefferson County notes that the rate on a certificate never changes while you hold it, including on later taxes you add to it.

That makes the premium easy to price. On a $1,500 lien bought with a $150 premium, a redemption after one year pays $195 of interest, so you clear $45 on $1,650 of cash. After six months the interest is about $98, less than the premium, so you are $52 down. The premium is only covered from the tenth month on. A premium is a bet that the owner will take years to pay.

The list is posted once and not updated

Delinquent taxes are advertised for three consecutive weeks starting in September; this year the notice ran in the Golden Transcript. The treasurer's list of delinquent properties page holds the 2025 real property list, dated September 21, and a separate spreadsheet of delinquent mobile homes.

The county says that list will not be updated there. Owners keep paying until 5 p.m. on the business day before the auction, and the parcels that are actually for sale are the ones SRI loads into Zeus Auction. Check a parcel's status on the county's property tax portal and its location on the tax lien properties map at gis.jeffco.us. Exact payoff amounts are not posted online; the office gives them by phone at 303-271-8330 or by email.

After the sale: safekeeping, August endorsements, redemption checks

You do not receive a paper certificate. Jefferson County keeps every tax lien certificate in the treasurer's office for safekeeping and emails buyers a list of what they bought.

If the owner skips the next year's taxes too, you can pay them and have them endorsed onto your certificate at the same rate (C.R.S. 39-11-119). The county mails holders the endorsement notice in August, the month it processes them. An owner who redeems must pay off the whole certificate, every endorsed year included; individual years cannot be paid separately.

Redemption payments come to the treasurer, not to you. Owners must pay with cash or certified funds, such as a cashier's check, money order or wire, which must arrive by 5 p.m. on the last business day of the month; postmarks do not count. The office is open Monday to Thursday, 7:30 a.m. to 5 p.m., and closed on Fridays. It then mails you a check for the taxes you bought, any endorsed taxes and the interest from the sale date. The premium is not part of it.

Three years, then an auction, and rarely a house

If a lien is still unpaid three years after the sale, you can apply for a treasurer's deed; the county says certificates sold in 2026 become eligible in 2029. The statute counts from August 1 of the third calendar year after the sale (C.R.S. 39-11.5-102(1)). Since July 1, 2024 the deed is no longer simply issued to you: the option for the deed is auctioned online on Zeus Auction. Jefferson County asks for a $1,200 deposit with each application, by separate check, and says the process takes at least six to eight months. Its rules of sale use $50 bid increments and let the original lienholder redeem the high bidder and take the deed itself.

The county is frank about how rarely this ends in property. It writes that it has never deeded a house or building of substantial value for unpaid taxes, and it points buyers who want real estate to the Public Trustee's foreclosure sales instead. A treasurer's deed that is issued can still be contested for seven years, which the county calls an unmarketable title for that period.

There is also an end date. Since Senate Bill 26-144, a certificate issued on or after January 1, 2026 expires seven years after it is issued unless a deed application is pending (C.R.S. 39-11-148). A lien bought on November 12, 2026 is dead in November 2033 if you have not applied by then. The same law rewrote the deed auction from June 1, 2026, so read the county's current rules before applying; the full procedure is on our Colorado page, and the sale itself in our Market Pulse note.

Four ways people lose money here

1. 1. Working from the September list

   The county will not update it. Parcels paid since September 21 are gone; only the items loaded in Zeus Auction are for sale.

2. 2. Bidding a premium you expect back

   It goes to the county and earns nothing. At 13%, a 10% premium needs more than nine months of interest just to break even.

3. 3. Registering under the wrong name

   Certificates are issued only in the name on your W-9, exactly as entered at registration. Fix it before November 10, not after the sale.

4. 4. Buying liens to get houses

   Jefferson County says it has never deeded a house or building of substantial value for taxes. Owners almost always redeem, and the deed goes through an auction anyway.