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Tax Sale Atlas

Sioux County, IA tax sales

Tax Sale Atlas maps the Sioux County, IA tax sale, one of 2,553 counties in 30 states. Iowa sells tax lien certificates paying up to 24%. Sale office, calendar and list locations read from the county’s own official pages on Jul 29, 2026.

How tax lien sales work in Sioux County, seat of Orange City: sale calendar, auction platform, over-the-counter lists, and the offices that run each sale.

New to tax sales? Read how Iowa tax sales work or look terms up in the glossary.

Next sale
Iowa holds no tax deed auction.
Format
ZEUS
Registration
Bidders register online at iowataxauction.com.
County office
(712) 737-3505
Every displayed fact carries a source badge. Verified Jul 29, 2026 against official county and state pages.How we verify
On this page

How Sioux County sells delinquent taxes

From lien to deed

Iowa holds no separate tax deed auction. The county treasurer makes out a deed for each parcel sold and unredeemed immediately after 90 days have expired from the date of completed service of the notice of expiration of the right of redemption, once the holder returns the certificate of purchase and pays the deed and recording fees.

Tax certificate sale (lien)

SRI / ZEUS
Run by
Sioux County Treasurer
Frequency
annual
Typical timing
Annual tax sale each June.
Registration
Bidders register online at iowataxauction.com.
Next expected
on the third Monday in June, 2027 (window; exact date posts closer to the sale)
Sale list
Notice to Tax Sale Purchasers 2026 (terms, timing, and where the delinquent list is published)
When it runs
Annual tax sale each June. The Treasurer's notice states: "The 2026 annual Tax Sale will be held by the Sioux County Treasurer on Monday, June 15, 2026, in the Treasurer's Office, 211 Central Ave SE, Orange City, Iowa, beginning at 10:00 a.m." Bidding closes at 11:00 a.m. that same morning. The notice adds that "An adjourned tax sale will be held on any business day following the annual tax sale in which there are bidders present and there are parcels still available for sale." The 2026 terms document is stated to cover taxes sold between June 15, 2026 and June 20, 2027.
Registration and deposit

Bidders register online at iowataxauction.com. The Treasurer states that "No mailed or emailed registrations will be accepted." For the 2026 sale, registration opened Monday, May 18, 2026 and ended Thursday, June 11, 2026, with all steps completed by 11:59 p.m. on June 11. Each bidder pays a non-refundable $36.00 registration fee by ACH debit and completes an online W-9 by the registration deadline. All bidders must be 18 or older as of sale day. An entity bidder needs a federal tax identification number plus either a designation of agent for service of process on file with the Iowa Secretary of State or a verified statement of trade name on file with the Sioux County Recorder. Registration and auction site help: (800) 800-9588 or support@iowataxauction.com.

Sale format and venue
Bidding runs online through iowataxauction.com even though the sale is conducted from the Treasurer's Office in Orange City. Bids may be uploaded before the sale but are not applied until the sale opens. Each parcel starts at a 100 percent undivided interest and bid-downs move in whole percentage points from 99 percent to 1 percent. Sioux County states it does not use batches. The certificate goes to the bidder naming the smallest percentage, and equal low bids are broken by random selection. Bids may not be withdrawn. Winners are invoiced at the close and the total is drawn by automatic ACH debit from the account used for registration fees, covering delinquent taxes, special assessments, interest, special assessment collection fees, publishing costs, and a $20.00 certificate fee per certificate. Certificates arrive roughly 7 to 15 days after the sale. Redemption interest runs at 2 percent per month, with each partial month counted whole. Subsequent taxes should be paid online through the Login To Pay Subsequent Tax module at iowatreasurers.org at $0.25 per parcel; payments made outside that module are treated as voluntary and left out of the redemption calculation. On the deed side, a regular tax sale allows the 90 day Notice of Right of Redemption after one year and nine months, while a public bidder tax sale (parcels advertised two years, marked with an asterisk on the published list) allows it after nine months. Certificates are assignable by endorsement with a $100.00 assignment transaction fee, and the Treasurer's tax sale deed issuance fee is $25.00 per parcel. The Delinquent Tax List is published the week of June 1 in a local newspaper, and the 2026 notice leaves the newspaper name unfilled; parcels on the published list were also viewable on the auction site by Friday, May 29, 2026, but only after completing registration.
Register on SRI / ZEUS
Source: Notice to Tax Sale Purchasers of the Terms and Conditions Governing the Annual Tax Sale of June 15, 2026, Sioux County Treasurer (PDF)· Verified Jul 29, 2026

Sioux County tax sale list and auction calendar

For Sioux County tax sale 2026 searches, use the county-run sources below rather than a copied parcel list, and confirm the parcel, registration cutoff, deposit, and payment deadline against the county before you bid.

  1. Get the advertised list

    Use Notice to Tax Sale Purchasers 2026 (terms, timing, and where the delinquent list is published) for the current advertised parcels, then recheck it before the auction.

  2. Register to bid

    Bidders register online at iowataxauction.com. Full requirements are in the sale card above.

  3. Sale day

    Iowa holds no tax deed auction. Bidding runs on ZEUS; check posted sale dates, registration status, and bidding windows there.

  4. Confirm with the office

    If the list, platform, and notice disagree, use County Treasurer as the source to confirm which parcels are actually offered.

Before you bid in Sioux County

  1. Start with the live sale list

    Pull the current advertised parcels from Notice to Tax Sale Purchasers 2026 (terms, timing, and where the delinquent list is published). Lists can change before the sale, so recheck the county source before you price a parcel.

  2. Confirm registration and deposit

    Bidders register online at iowataxauction.com. The Treasurer states that "No mailed or emailed registrations will be accepted." For the 2026 sale, registration opened Monday, May 18, 2026 and ended Thursday, June 11, 2026, with all steps completed by 11:59 p.m. on June 11. Each bidder pays a non-refundable $36.00 registration fee by ACH debit and completes an online W-9 by the registration deadline. All bidders must be 18 or older as of sale day. An entity bidder needs a federal tax identification number plus either a designation of agent for service of process on file with the Iowa Secretary of State or a verified statement of trade name on file with the Sioux County Recorder. Registration and auction site help: (800) 800-9588 or support@iowataxauction.com.

  3. Check the state rules that change the bid

    Read the Iowa due-diligence checklist before bidding. Redemption, liens that survive a tax deed, title cleanup, and payment deadlines can change what a parcel is worth.

  4. Set a walk-away number

    Work out what the parcel is actually worth with the rural land value estimator, then turn it into a ceiling with the tax deed max-bid calculator.

Over-the-counter (leftover) purchases

Two routes reach parcels after the June sale. Parcels that remain unsold for want of bidders are carried to adjourned sales, which the treasurer sets at intervals of not more than two months until the next annual sale. Separately, certificates struck to the county at the public bidder sale may be assigned by the county for the total amount due on the date of assignment, or for a compromised amount, under a written agreement filed with the treasurer and a 10 dollar assignment transaction fee. Ask the county treasurer which county-held certificates are available for assignment.

New to this path? Read how over-the-counter certificates work. Every state has its own name for what goes unsold, so check what Iowa calls its leftover tax-sale inventory.

Use the arrow keys to switch between these sections.

County offices

Tax Collector (runs the certificate sale)

Sioux County Treasurer

(712) 737-3505

211 Central Ave SE, P.O. Box 77, Orange City, IA 51041-0077

Official website

County notes

  • County seat is Orange City. The Treasurer is Daniel D. Zomermaand, appointed June 2020.
  • Sioux County publishes its tax sale notice and terms on its Treasurer page at iowatreasurers.org rather than on the county's general website, so investors should check that page for each year's notice.
  • Property tax line is (712) 737-3505 and the office fax is (712) 737-8170. Office hours are 8:00 a.m. to 4:30 p.m. Monday through Friday, with the office closed every Tuesday from 8:00 to 9:00 for training.
  • General office email listed by the Treasurer is treasurer@siouxcounty.org.
  • The Treasurer's notice cites Iowa Code Chapters 446, 447, and 448 as the governing chapters for tax sales, tax redemption, and tax deeds.

Iowa rules

Max interest rate
24% per year, fixed by statute (not bid down)
Minimum return
No statutory minimum return; what you earn is set by the share of ownership taken at the sale
Redemption
A parcel may be redeemed at any time before the right of redemption expires. After one year and nine months from the date of sale, the certificate holder may serve a notice of expiration of the right of redemption on the person in possession, the person in whose name the parcel is taxed, and every mortgagee, contract vendor, recorded lessor, and other party of record. The right of redemption then ends 90 days after that service is complete, which means the affidavit of service has been filed with the county treasurer. Three shortened tracks exist: nine months from a public bidder sale under section 446.18, and three months from an abandoned-property or public nuisance sale under section 446.19A or 446.19B. After the treasurer delivers the deed, redemption is possible only through an equitable action in district court, and only by a person who could have redeemed during the 90-day window.
Surplus proceeds
No surplus arises. The deed conveys the parcel to the certificate holder rather than selling it to the highest bidder, so there are no excess proceeds to distribute. Where the winning bid was less than 100 percent, the deed conveys only that undivided percentage interest in the parcel.
Governing statute
Iowa Code Chapter 446

A tax deed does not convey marketable title. Most buyers file a quiet title action before they can resell or insure the property. See the due diligence guide.

See the full Iowarules and every county →

Frequently asked questions

Does Sioux County, Iowa sell tax liens or tax deeds?

Tax lien certificates. In Iowa investors buy the lien, not the property; the County Treasurer runs the sale.

When is the Sioux County tax certificate sale?

Annual tax sale each June. The Treasurer's notice states: "The 2026 annual Tax Sale will be held by the Sioux County Treasurer on Monday, June 15, 2026, in the Treasurer's Office, 211 Central Ave SE, Orange City, Iowa, beginning at 10:00 a.m." Bidding closes at 11:00 a.m. that same morning. The notice adds that "An adjourned tax sale will be held on any business day following the annual tax sale in which there are bidders present and there are parcels still available for sale." The 2026 terms document is stated to cover taxes sold between June 15, 2026 and June 20, 2027. Registration and bidding happen on the county's online platform. Always confirm the exact date with the County Treasurer before the sale.

How often does Sioux County hold tax deed sales?

Sioux County holds its tax deed sale none. Iowa holds no tax deed auction. Each sale is scheduled and advertised in advance, so check the county's tax deed calendar for the next posted date.

I own a property in this sale. Can I stop it?

Often yes, by paying the overdue taxes, interest, and costs before the deadline. Iowa's redemption rule: 1 year 9 months from the sale before the notice of expiration can be served, then 90 days after service is complete. Call the County Treasurer as early as possible for your exact payoff and options; deadlines are strict. Free help: lawhelp.org lists legal aid programs, and consumerfinance.gov lists HUD-approved housing counselors.

Where can I find the Sioux County tax sale list?

Sioux County posts its tax sale list at iowatreasurers.org. Lists go up ahead of each sale and keep changing until the sale date, so confirm every parcel against the county's legal advertisement before you bid.

Verified Jul 29, 2026 against official county and state sources.

Tax Sale Atlas publishes educational information about public tax sale processes. This is not legal, financial, or investment advice. Rules, dates, and fees change; confirm with the county office before you bid.

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Compare sale calendars, platforms, and rules across the state, or read the guides before you bid.

Iowa tax salesDue diligence guide
Call Sioux County TreasurerOpen auction