City of Des Moines · Tax Increment Financing

Methodology & limitations

What this covers

A project is not the same as a council vote. A single deal typically returns to the council several times — preliminary terms, then final terms, then amendments years later. Those actions are clustered into one project, and the figures reported are the committed terms from the agreement of record, with the full action history kept in the timeline.

Sources

Source	What it provides	Role
Council agendas & minutes councildocs.dsm.city	Item descriptions, developer names, addresses, roll-call numbers, votes, dispositions	What was decided
Council communications staff reports attached to items	Incentive amount & structure, total project cost, urban-renewal area, and the projected taxes-with-vs-without-project tables	The money
Iowa Dept. of Management urban-renewal filings	TIF actually collected and actually rebated, per year, per area	Independent actuals
Polk County Assessor parcel roll + geometry	Current assessed value, year built, TIF-district tag, parcel location	What exists on the ground
City of Des Moines neighborhood boundaries	51 recognized neighborhood polygons	Geographic grouping

How it was built

Harvest
Screen
ExtractEach candidate item — its agenda text, minutes text and full staff report — is read and converted into a structured record: counterparty, project, address, incentive amount and structure, total cost, units, disposition, vote, and a source citation with page and a short verbatim anchor phrase.
ReconcileActions are clustered into projects, the agreement of record is promoted to the headline row, and the best-available figure is carried forward with a tag showing which meeting it came from.
Join

Key decisions

TIF is reported on a net-present-value basis, not cash basis

Staff reports state each incentive two ways: a larger cash basis (the undiscounted sum of rebates over 15–20 years) and a smaller net present value. The city commits to, caps, and reports its own "% of project cost" on the NPV. Using the cash figure overstates the subsidy by roughly 40–75%.

No figure is ever estimated

Where a document says terms are "as set forth in the Agreement" and gives no number, the field is left blank and flagged — never inferred, interpolated, or back-computed. This is why totals are described as "stated" figures and cover only part of the project count.

Batch actions are shown but excluded from totals

Annual Workforce Housing Tax Credit resolutions bundle many unrelated developments into one item, and their stated cost aggregates all of them — several of which have their own rows. These rows are marked batch and left out of every sum to prevent double-counting.

Actual rebates are a developer-level figure

The state reports rebates by recipient, not by project. A developer's total spans all of their projects, so the "actual rebate paid" column is a developer total attached for reference — it is never summed across rows. The authoritative citywide totals come from the state series directly.

Validation

Three independent sources are used to check each other, and they agree:

Limitations

Read these before drawing conclusions. None of them are hidden in the data — each has a corresponding flag or blank cell.

Definitions

Tax increment financing (TIF): When a project raises a property's taxable value, the additional tax — the increment — is diverted to repay project costs instead of flowing to the general funds of the taxing bodies. Des Moines typically pays this to the developer as a rebate over a set term.
Net present value (NPV): A future stream of rebates expressed in today's dollars (staff reports use a 4.5% discount rate). Always smaller than the undiscounted cash total. This is the basis used throughout.
Net public gain: The staff-projected net taxes flowing to all taxing bodies — schools, county, city, transit — after the incentive is paid, compared against leaving the site as it is. It is a projection, not an outcome.
Urban renewal area: The statutory district (Iowa Code ch. 403) whose increment funds a project. Distinct from a neighborhood: districts are fiscal boundaries, neighborhoods are the city's recognized civic areas.
Certificate of completion: Issued once a developer satisfies the agreement. Used here as confirmation a project was actually built, as opposed to merely approved.
Assessed value: The Polk County assessor's current total value for the matched parcels. For a finished project it reflects the building; for a recent approval it still reflects the pre-development site.