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General Information

Location of public auction

The annual public auction of real estate tax liens will be held as an internet auction. Tax liens available for bid will be listed at (hereinafter referred to as “Auction Website.”)

Date and time of public auction

Bidding will begin on October 15, 2018 at 8:00 a.m. M.D.T. and will close on October 17, 2018 at 5:00 p.m. M.D.T.

Computer workstations

Access to computer workstations for bidding will be available in the City and County of Denver, Treasury Division, 201 West Colfax Avenue, Wellington E Webb Municipal Office Building, Denver, Colorado between October 1, 2018 and October 18, 2018, between the hours of 8:00 a.m. M.D.T. and 5:00 p.m. M.D.T., Monday through Friday.  Access will be on a first come first served basis.

Unpaid tax list and public auction

Publication of the unpaid tax list will be in alphabetical order by property owner name.  The list will be published in The Denver Post on September 14, 21, and 28.  Taxes will be auctioned in parcel identification number order.  The list of the unpaid taxes, in parcel identification number order, will be posted (1) at the Auction Website beginning October 1, 2018 and (2) in the Taxpayer Service area of the Treasury Division for several days before the public auction.  Each parcel will be offered for the amount of taxes, advertising, penalty interest, and fees and will be subject to general bidding.

  • Delinquent Real Estate Tax payments must be received in our office by 4:00 p.m. M.D.T., Friday, October 12, 2018.  Payments will not be accepted during and after that time without redemption interest.
  • Any questions regarding the Annual Public Auction should be directed to the Treasury Division, Taxpayer Service, 201 West Colfax Avenue, Wellington E Webb Municipal Office  Building, 1st floor, Denver Colorado 80202, (720) 913-9300.


Bidding rules


Each bidder must register on the Auction Website before they will be allowed to participate in the tax lien sale.  After registering, each bidder will receive a bidding number from the Auction Website that will enable the bidder to place bids.  All bidders must make a deposit on the Auction Website before their bids will be accepted.  Registration and deposits may be made starting October 1, 2018, and must be completed no later than October 10, 2018, at 2:00 p.m. M.D.T.  No registration or deposits will be allowed after this time.  Each bidder shall make a deposit equal to ten percent (10%) of the total dollar amount of tax liens the bidder anticipates winning.  All deposits shall be made by electronic funds transfer.  Final determination regarding the acceptability of any deposit will be at the discretion of the Treasurer.  If a bidder’s deposit drops below ten percent (10%) of the total dollar amount of all tax liens won, plus the amount of active bids, while there are still active bids, the active bids will not be accepted.  Buyers are responsible to ensure the information on their registration is correct since certificates of purchase, redemption checks, and refund checks are prepared from this information.

In accordance with §39-11-115 (2) (c) and (d), C.R.S., minimum bids and bid increase increments are as follows:

Minimum bids:

The minimum starting bid for each tax lien is equal to the amount of the unpaid taxes, interest, penalties, and fees (the tax lien face value).

Bid increments: 

Bid increments shall be one dollar ($1.00).  Tax liens are awarded to the highest bidder, or in the event of a tie, the winner will be selected at random by the Auction Website, and the winning bid amount will equal the amount of the tie bid.   

Tax liens will be grouped into batches and sold in one hour increments starting on October 17, 2018, at 8:00 a.m. M.D.T. and concluding on October 17, 2018, at 5:00 p.m. M.D.T.  Tax liens in each batch will be identified with a closing time.

Bids may be made starting October 15, 2018, at 8:00 a.m. M.D.T.  Bids will be accepted for each tax lien until the batch containing it closes.  The Auction Website stores the bids for each tax lien until the batch containing it closes.  Prior to the closing of the batch, bidders may change or withdraw their bids.  Once a batch closes, the bids become final and may not be changed or withdrawn.

Payment for the total amount of the bidder’s winning bids shall be automatically initiated via an Automated Clearing House (ACH) debit no later than October 18, 2018 at 2:00 p.m. M.D.T.  The account debited will be the last successful deposit account.  If a winning bidder fails to pay the amount due by this time, the Treasurer may, in the Treasurer’s sole discretion, award the tax liens to another bidder or may offer the tax lien for sale.  The Treasurer may prohibit a person, who fails to pay the amount due from bidding, from participating in any tax lien sales for up to five years in accordance with § 39-11-116, C.R.S.

The certificate of purchase issued on a successful bid will show the legal description, purchase amount, and buyer’s name (as entered in registration), interest rate, and date of sale.  Buyers will be notified when their certificates are ready to be picked up.  The City and County of Denver will keep them if the buyer wishes and provide copies.

If parcels are redeemed prior to delivery of certificates, redemption checks will be mailed to buyers and notations made on buyers’ lists of purchases.

Employees and officials of the City and County of Denver, and members of their families are not allowed to purchase at the Public Auction.


  • Those investing in tax liens do so at their own risk and are advised to exercise due diligence in carefully analyzing which tax liens to bid on.  There are no guarantees expressed or implied regarding whether a tax lien will prove to be a profitable investment.
  • The property information accessible on the bid pages was obtained from the Assessor’s office prior to the start of the current auction and is for reference only (please note that this property information, provided by the Assessor’s office, represents the most current assessment year, not the tax year associated with this tax lien sale, as taxes are paid one year in arrears). It is the buyer’s responsibility to research auction items thoroughly prior to placing bids.
  • Do not attempt to make any name changes to your existing account.  To make a name change, you must contact the Treasury Division at 720-913-9500.