The Evidence That Wins Colorado Property Tax Appeals (and What Gets Ignored)

Most denied protests fail for the same reason: the homeowner argued feelings ("my taxes are too high!") instead of value. Assessors and County Boards of Equalization can only act on evidence about what your home was worth on the appraisal date. Here's what that evidence looks like when it wins.

Rule zero: argue value, inside the study period

Colorado residential values must reflect sales from the statutory study period — an 18-month window ending June 30 of the even year before reassessment (the rules come from Title 39 of the Colorado Revised Statutes; the Division of Property Taxation publishes assessor procedures). A sale from last month may be useless; a slightly older sale inside the window is gold. Anchor every argument to that period and to the question "what would this home have sold for then?"

Comparable sales: the backbone

• Pick 3–5 truly comparable homes: same neighborhood or school area, within ~20% of your size, similar age and style, sold inside the study period.
• Adjust honestly. If a comp has a remodeled kitchen and yours is original, the comp's price should be adjusted down before comparing. Boards respect homeowners who adjust against themselves where warranted.
• Lead with price per square foot, then explain the adjustments. A tight range across several comps below your assessed value is very hard to dismiss.
• Avoid cherry-picking. One distressed sale among ten higher ones will sink your credibility; a consistent pattern wins.

Condition evidence: show, don't tell

The model assumed your home is average. Prove it isn't with documentation a stranger can verify:

• Dated photos of the roof, foundation cracks, original kitchens/baths, water damage
• Contractor estimates or inspection reports putting a dollar figure on needed repairs
• Insurance claims or engineering reports for structural issues

Record corrections: the easiest wins

If the county has your square footage, bath count, basement finish, or quality grade wrong, document the truth (floor plan, appraisal, photos) and ask for the correction plus the corresponding value change. These are the fastest, least adversarial wins in the system — the assessor's office fixes data errors all the time.

What gets ignored

• "My taxes went up too much" — the board can't change tax rates, only value.
• Zillow/Redfin screenshots by themselves — automated estimates carry little weight; the sales behind them, properly selected, are what matter.
• Comps from outside the study period or from dissimilar neighborhoods.
• Your neighbor's lower assessment (rather than sales) — equalization arguments exist but are much weaker than market evidence in practice.

Putting the package together

1. One-page summary: your requested value and the three strongest reasons.
2. Comp table with addresses, sale dates, prices, $/sqft, and adjustments.
3. Condition exhibit: photos + repair estimates, each labeled.
4. Record corrections, if any, with proof.

That's the exact structure HomeTaxDrop builds for every client — pulled from county records, sales data, and the photos you give us, then filed and argued on your behalf for no upfront cost. Run your address and see what your case looks like, or start with how the appeal process works.