Polk County at a Glance
Polk County is Iowa's economic and population center. Des Moines anchors a growing insurance, financial services, and tech sector — Principal Financial, Nationwide, and Wells Fargo all have major presences. The metro is expanding steadily west into Dallas County and north into Ankeny. For tax lien investors, Polk offers Iowa's largest parcel pool with meaningful property diversity.
Polk County uses a rotational/random assignment format consistent with most Iowa counties. Investors register interest in specific parcels before the sale. When multiple investors register for the same parcel, the county treasurer assigns the certificate by random rotation — no competitive bidding on rate. You receive the full 24% annual rate (2% per month) regardless of how many other investors wanted the same parcel.
Registration opens several weeks before the June sale. The delinquent parcel list is published in local newspapers and on the Polk County Treasurer's website. Review the full list, identify parcels you want, research them thoroughly, then register your interest with the treasurer before the deadline. Unlike SRI-based states (Indiana), Polk County runs its own sale — go directly to the treasurer's office for procedures.
Competition in Polk County is higher than rural Iowa counties — more investors register for Des Moines parcels than for farmland in southwest Iowa. But because the rate is fixed at 24% regardless, "competition" here only affects whether you are assigned a specific parcel, not the rate you earn. Register for more parcels than you need to ensure you're assigned your target volume.
The Des Moines and Raccoon Rivers run through central Polk County, and significant portions of the inner-city floodplain have been mapped as FEMA Special Flood Hazard Areas. While major flood events are less common than in Iowa's river-border counties, properties adjacent to these waterways carry flood risk that affects both resale value and the owner's ability and willingness to redeem.
Before registering interest in any Polk County parcel near a river or creek, check the FEMA Flood Map Service Center for current FIRM designation. Properties in Zone AE (100-year floodplain) face mandatory flood insurance requirements on any financed resale, limiting your exit market if redemption does not occur and you ultimately take a deed.
How Polk County Tax Lien Sales Work
Rotational Assignment
Polk County holds its annual tax sale in June with registration required in advance. The delinquent parcel list is published before registration opens. Register interest in your target parcels with the Polk County Treasurer before the deadline. No deposit is required in most Iowa counties — confirm current policy with the treasurer. The county assigns certificates by rotation where multiple investors register.
24% Annual — 2% Monthly Accrual
All Iowa tax lien certificates earn 24% per year, accruing at 2% per month from the date of sale. This is the full statutory rate — not reduced by competitive bidding. Payment is due promptly after assignment. The county issues a tax sale certificate confirming your lien position, the amount, and the accrual start date. Keep this document — it is your legal instrument.
21 Months — Then Tax Deed
Owners have 21 months from the sale date to redeem by paying the certificate amount plus all accrued interest (24% per year). You may pay subsequent year taxes during this period to add to your certificate balance and earn additional interest. After 21 months unredeemed, apply to the Polk County Treasurer for a tax deed with proper notice to the owner. Iowa Code § 448 governs the deed process.
Key Details
| County seat | Des Moines — Iowa's capital and largest city |
| Population | 492,401 (2020 Census) — largest county in Iowa |
| Sale timing | Annual — June; confirm exact date annually with Polk County Treasurer |
| Sale format | Rotational assignment — no competitive bidding on rate |
| Registration | Required in advance — contact treasurer for current deadline and procedure |
| Deposit | Usually none required — confirm with Polk County Treasurer each year |
| Interest rate | 24% per annum, accruing at 2% per month from sale date — Iowa Code § 447.1 |
| Redemption period | 21 months from date of sale — Iowa Code § 447.9 |
| Subsequent taxes | Certificate holder may pay subsequent year taxes and earn 24% on those amounts too |
| Tax deed path | Apply to Polk County Treasurer after 21-month period; serve notice to owner — Iowa Code § 448 |
| County Treasurer | 515-286-3080 · polkcountyiowa.gov → |
| Statute | Iowa Code § 446 → · § 447 → · § 448 → |
Research Tools for Polk County
Polk County Treasurer
Primary source for sale schedule, delinquent parcel list, registration procedures, and certificate issuance. Contact directly for each year's sale date and registration deadline.
polkcountyiowa.gov →Polk County Assessor
Assessed values, property characteristics, land use classification, and ownership information. Cross-reference with the delinquent list to evaluate certificate collateral before registering.
Polk Assessor →Polk County Recorder
Deeds, mortgages, and all recorded instruments. Search for prior encumbrances on any parcel where you intend to pursue a tax deed if unredeemed — assess your lien priority.
Polk County Recorder →Polk County GIS
Parcel boundaries, aerial imagery, zoning, and property data. Use to verify lot size, land use, and condition of surrounding properties before registering interest in any parcel.
Polk County GIS →FEMA Flood Map Service
Official FIRM maps for Des Moines River and Raccoon River floodplain zones. Check any parcel near either river corridor before registering — flood zone affects resale exit if you ultimately receive a deed.
FEMA Flood Maps →City of Des Moines Permits
Building permits, code violations, and demolition orders for Des Moines city addresses. Open code violations can affect your position if you ultimately receive a deed and attempt to sell or rent.
Des Moines Permits →Des Moines Area Association of Realtors
Current residential market data for Polk County — median prices, days on market, and absorption rates by neighborhood. Verify collateral value and exit market before registering.
DMAAR Stats →Iowa DNR Environmental Sites
Contaminated sites, UST registrations, and environmental records. Check commercial or former industrial parcels before registering — Iowa DNR maintains site-specific remediation records.
Iowa DNR Sites →Polk County Court Records
Active foreclosure proceedings, probate cases, and civil actions on properties of interest. Existing mortgage foreclosures can affect lien priority and your post-deed position.
Polk County Courts →IRS Lien Search
Federal tax liens must be researched separately — they can affect priority position in Iowa just as in other states. Check commercial parcels or any property with apparent prior business operations.
IRS Lien Search →Iowa Code § 446 — Tax Sale
Governing statute for Iowa tax sales — registration, assignment process, minimum bids, and certificate issuance.
Iowa Code § 446 →Iowa Code § 448 — Tax Deed
Process for applying for a tax deed after the redemption period — notice requirements, treasurer procedures, and deed issuance.
Iowa Code § 448 →Model Polk County lien returns before you register
Use the LTV Calculator to project 24% annual interest returns across your certificate portfolio, and the Parcel Tracker to log flood zone status, code violations, and redemption deadlines for each parcel.