Property Tax Appeal Guides by State
I am based in Highlands Ranch, Colorado, and work across the West and Midwest. Every state below has a full appeal guide on this site: deadlines, ratios, procedure, caselaw. The Free Assessment Review runs in every one of them. I appear personally in Colorado and Utah, and I handle the other states personally, case by case.
Colorado First, Then the Rest of the Footprint
Each card carries what the state's appeal turns on and the real-property protest deadline as published on the deadline table. Two kinds of clocks run across these states: fixed-date states set the deadline by statute no matter when the notice arrives, and notice-date states start counting the day the assessor mails. The controlling date is always the one printed on your notice.
May 1 notices, the June 1 protest deadline from 2027, CBOE, BAA and abatements, by a consultant who argues every case.
Most Arizona property can't be usefully appealed, because taxable value sits near half of market. The opportunity is Rule B resets, parcel splits, and the FCV window.
Prop 13 base values, Prop 8 decline-in-value relief, the July 2 filing window, and county-by-county deadlines.
The April 2–30 protest window, the 90% commercial rollback, the equity ground, no-fee PAAB appeals, and the 2027 reassessment.
March 1 notices, the 30-day informal window, BOTA, the county's burden of proof, and the new five-year post-appeal protection.
State-level DOR valuation on a two-year cycle, the AB-26 informal review, county and state tax appeal boards, and the 2026 tiered commercial rates.
June 1 valuation notices, the June 30 county board deadline, TERC appeals by August 24, and full-market-value assessment at Omaha rates above $2 per $100.
December 18 notices, the January 15 county board deadline, the taxable-value ceiling, obsolescence, and the tax-cap screen.
Measure 50's RMV/MAV system, compression, the December 31 PVAB deadline, and the Oregon Tax Court.
July valuation notices, the September 15 county BOE deadline, the State Tax Commission, and real certified tax rates by county.
100% market-value assessments, the July 1 / 30–60 day county BOE deadlines, and the State Board of Tax Appeals.
Late-April assessment schedules, the 30-day objection window, county and state boards of equalization, the 9.5% commercial ratio, and the industrial classification line.
Deadlines are the real-property dates as published on the deadline table, last verified August 2026. Colorado business personal property runs on its own calendar, covered in the Colorado guide; other states' personal-property dates are in each state guide. Several states move dates for weekends, county elections, or late mailings.
The guide is the reference. The review is the answer.
Send me the notice of value, or an address and county, for a commercial property in Colorado or any state above, and I will tell you in writing whether the number is worth contesting, and say so plainly if it is not. Acknowledged within one business day. No retainer, no fee unless your taxes are reduced.