Issues
You should know where every single cent of your tax bill is going and which authority is responsible.
The burden of proof for an appeal should rest on the county, not you, as long as you have made a good-faith effort to justify the discrepancy.
Property taxes are hard to follow. The state Legislature sets the tax framework; local taxing authorities set mill levies and receive the revenue. Property tax dollars stay in your county and do not fund state services; they support local entities such as schools, counties, cities, and special districts. The Assessor does not write tax law or set mill levies; the job is to value property fairly and run an office that puts clarity first: what drives the numbers on your bill and where to go next. This page goes deeper on the assessor-shaped parts of that picture: what is easy to find, what is explained in plain language, and what is available by default. For a plain-language statewide overview, see Understanding Property Taxes in Colorado from the Colorado Division of Property Taxation.
Government should never benefit from the fact that citizens lack the time, expertise, or resources to challenge it.
Property taxes in Colorado have gone up sharply. The assessor does not set assessment rates or mill levies; the question is whether you can see what drove the increase.
But when your bill arrives:
- Can you easily see exactly which authorities drove the increase?
- Can you easily find your comparable sales ("comps")?
- Can you follow the logic from your property's characteristics to its assessed value in plain language?
For many Arapahoe County residents, the answer to all three is no, or getting a clear answer takes more work than it should. Much of what you need is public, but it is not assembled in one place: you have to trace it across statutes, metro districts, mill levies, and county tools. Residents should not have to do that detective work just to understand their assessment and their bill. Making the picture clear, plain, and easy to follow is the assessor's job.
Property valuation appeals (Arapahoe County)
This campaign site is not the county. Filing instructions, forms, and deadlines are set by Arapahoe County. For tax year 2026, the county's real property valuation appeal window ran May 1 through June 8, 2026 and has closed. If you filed a protest during that window, the county site is where you check status , read the Assessor's determination, and find any next steps.
Under Colorado's two-year reappraisal cycle, odd years are general reappraisal years for real property; even years are often intervening years where many parcels see smaller year-to-year changes. That can make it easy to assume "nothing big is happening" even when a protest window is open for the current tax year, which helps explain why owners miss deadlines even when the county has posted them online.
Several residents have told this campaign they only learned about the 2026 window from social media or a neighbor, not from postal mail. That pattern is why the campaign pushes for clearer notice and county information that is easy to find year-round, not dependent on whether mail caught your attention. If you are unsure whether you already filed or what your Notice of Valuation shows, use the county's official channels (including e-notices, if you enrolled) rather than unofficial screenshots alone.
Fairness in appeals: The burden of proof for an appeal should rest on the county, not you, as long as you have made a good-faith effort to justify the discrepancy. In plain terms, once a resident shows up in good faith with real evidence, the county should carry the weight of defending the valuation on the record. Do not leave people to reverse-engineer a black box alone. That is a standard for how the office should operate; specific rules and evidence requirements for any given protest still come from state law and county materials.
Further appeal: if you filed during the 2026 window and disagree with the Assessor's determination on your protest, Colorado's process may continue to a County Board of Equalization step, with its own deadlines. The county's appeals materials describe that path on the county site.
Transparency that matters
A lot of information is public, but it is often scattered, buried in PDFs, or hard to reuse. You should have easy access to what you need to understand assessor-related parts of your bill: not a treasure hunt, and not something that requires you to be a tax or tech specialist to get the basics.
Transparency that matters means helping people see how valuation and line items connect to the legal framework (state law and local overlays), in plain language. The goal is clarity: useful information you can act on, not a maze of PDFs and disconnected pages.
- People should not have to connect the dots across county sites to interpret public data.
- Plain-language explanations should be consistent wherever you look, so taxpayers are not piecing together conflicting stories from notices, portals, and other pages.
Public APIs and machine-readable data
When assessor-related data is only available as unstructured pages or PDFs, residents and third parties end up retyping, screen scraping, or maintaining one-off tools. That is friction, and it increases the chance that copies of the data drift out of sync with the official source.
Where appropriate, public APIs (or other stable machine-readable feeds) make it easier to build accurate, repeatable, auditable tools. That includes people who want to manipulate raw data for research, journalism, or their own analysis, not only casual browsers.
- Structured, machine-readable data (CSV and similar) and clear presentations reduce guesswork and repeated manual work, and they make transparency easier to verify than when everything lives in PDFs or unstructured pages.
- Residents and software developers should not have to rely on scraping just to get straightforward answers.
Mass appraisal (CAMA)
Computer-assisted mass appraisal (CAMA) is the software and workflow stack counties use to value large numbers of properties: models, comparable data, rules, reappraisal cycles, and the workpapers appraisers rely on. It is not a casual policy dial; it exists so professional judgment can be applied at scale while staying defensible under Colorado appraisal standards and oversight.
That judgment shows up in concrete office choices: neighborhood boundaries, how tax increment financing (TIF) and other classifications interact with value, and which comparables and adjustments the workflow uses. Those choices change the assessment. One Colorado example is Aurora Urban Renewal Authority litigation over TIF reassessment, resolved by the Colorado Supreme Court in 2024 (details in the note below). How much of that judgment and supporting evidence owners see on notices and portals before they protest depends on configuration, product capabilities, and office policy. None of this is fully black and white: state law and Colorado appraisal standards still leave room for interpretation and practice, so counties do not all land in the same place.
Aurora URA, developers, and TIF reassessment
Starting in 2018, Aurora Urban Renewal Authority (AURA) and developers in the renewal areas sued the Arapahoe County assessor and the Colorado Property Tax Administrator over how tax increment financing (TIF) splits reassessed value between base and increment.
Plaintiffs argued much of the gain was indirect "hype" value (market perception that the plan area is hotter), and that it should sit in the URA increment. The administrator's rule treated that indirect slice as split per the administrator's formula between increment for the URA and the base shared by schools, county, and other overlapping districts, which they said shorted the TIF side.
On January 22, 2024, the Colorado Supreme Court upheld the administrator and the assessor (2024 CO 4, No. 22SC92), reversing the Colorado Court of Appeals. Opinion .
Campaign positions are goals, not a guarantee of a specific vendor or contract. Nothing here claims how Arapahoe County's system is set up today; the Assessor's office holds that operational record. The point is to treat taxpayer-facing outputs as a first-class outcome of how mass appraisal is run.
Metro districts
Metro districts can affect a significant portion of property tax bills, especially when long-term debt (bonds) is involved. Example concerns include how districts are governed and how debt service can shape the tax bill over time. The core campaign goal is the same: make underlying public data understandable.
What is a metro district?
A metro district (metropolitan district) is a local government that can charge property taxes in your neighborhood for things like roads, parks, and water. Often part of that tax goes to repaying long-term debt (bonds).
How it is supposed to work: In a conservative or well-run district, the borrowed money roughly matches the cost of improvements, and property taxes mainly repay that debt over many years.
Good use (the intended model)
- Debt finances improvements, and taxes repay the borrowed amount over time.
- Residents can understand the connection between improvements, debt, and what shows up on the tax bill.
Bad use risk (legal abuse)
- In some districts, bonds can be used as a cash-flow strategy, where the borrowed amount is intentionally larger than what was spent on improvements.
- In those scenarios, homeowners can end up paying for infrastructure twice: once through the home price and again through long-term debt service.
- Some debt-service structures may also have governance dynamics that limit oversight and practical pushback for later homeowners.
Tool note: This page is campaign informational. Always verify details with official county and district sources.
Modernizing property assessment
Modern Systems is the inward side: office systems, CAMA, workflows, data shared with other county offices. Better Outcomes for Residents is the outward side: access, transparency, usable data. Modernizing assessment means getting both right. Fair, explainable results come from process, not slogans. I want residents to follow the story of their bill, not guess.
Definitions
Next step: explore the resident-facing tools I build from public data.
This is informational and not legal or tax advice. Always verify details with official county sources.