Colorado is Moving Your Property Tax Deadlines. Here's the New Timeline.

The Bottom Line

Colorado is shuffling the calendar for property taxes starting in 2027. If you plan to protest your home's valuation or apply for senior and veteran tax breaks, you'll have new deadlines to memorize—some earlier, some later. It also cuts red tape for counties, meaning faster decisions on property tax refunds under $20,000.

What This Bill Actually Does

SB26-046 is a procedural cleanup bill that rewires Colorado's property tax calendar and cuts administrative red tape. The biggest shift is around property tax valuation protests. For real estate, the deadline to protest your property's valuation with the county assessor is moving up by a full week—from June 8 to June 1. County assessors will also have to wrap up those protest hearings by June 1. For business personal property, the deadline to conclude hearings is shifting to June 30, perfectly matching the actual protest deadline.

On the tax break front, the bill actually gives folks more time to get their paperwork together. It aligns the application deadlines for the qualified-senior primary residence classification and the disabled veteran property tax exemption. Instead of a scattered spring schedule, both will now have a regular application deadline of July 15 and a late application deadline of August 15.

On the backend, the bill doubles the threshold for county commissioners and assessors to settle property tax refunds or abatements locally. Previously, any abatement over $10,000 had to go to the state Property Tax Administrator for review. That threshold is now $20,000, meaning local governments can issue medium-sized refunds faster without asking the state for permission. Finally, the legislation drags the state's property tax administration into the digital age. It officially allows county assessors to submit required tax documents to the state in an electronic format, rather than being forced to mail physical paper, and reduces the number of duplicate copies required for various official notices.

What It Means for You

For the average homeowner, the most critical takeaway from this legislation is the new June 1 deadline to protest your real property valuation. Every two years, when you get that notice in the mail telling you what the county thinks your house is worth, the clock starts ticking. Losing a week off that protest window might not sound like much, but gathering neighborhood comps and preparing a solid appeal takes time. If you miss that June 1 cutoff, you lose your right to formally object to the valuation adjustment for that cycle.

If you are a senior citizen or a disabled veteran, the news here is much better. By pushing the application deadline for the senior and veteran property tax exemptions back to July 15 (with a late grace period extending to August 15), you get significantly more breathing room to get your paperwork in order. This replaces the old mid-March deadline for the qualified-senior primary residence subclassification, giving families more time to realize they qualify and apply during the summer rather than scrambling during tax season.

Keep in mind that these major calendar shifts—including the protest and exemption deadlines—don't actually take effect until January 1, 2027. You've got some time before you need to update your calendar. Also, if you ever find yourself fighting for a tax refund due to a county error on your property's square footage or classification (known as an abatement), you could see your money faster. By bumping the state-review threshold from $10,000 to $20,000, the county can simply cut you a check for a $15,000 overpayment without waiting weeks or months for a state bureaucrat in Denver to sign off on it.

What It Means for Your Business

If your business involves owning commercial real estate, developing land, or managing multifamily properties, you need to circle June 1 on your 2027 calendar. Moving the real property protest deadline up from June 8 means your window to evaluate the county's assessment, consult with your tax counsel, and file an appeal is compressed. For businesses with large portfolios across multiple counties, losing that week of prep time means your team will need to move a lot faster once notices of valuation drop in early May.

For businesses with significant equipment, machinery, or furniture—which is subject to business personal property tax—the changes are a bit different. Your standard protest deadline stays at June 30, but assessors will now have to conclude their hearings by that same date, rather than dragging into July. However, if your county uses an alternate protest and appeal procedure (which some larger counties do to handle high volumes), the timeline shifts later: you'll receive your valuation notice by July 15 and have until July 31 to protest. You'll want to check with your specific county assessor's office to see which timeline they follow so you don't miss your window.

The operational changes in this bill will actually streamline things if you're disputing a tax bill. The increase in the local abatement settlement threshold to $20,000 means that mid-sized commercial tax disputes can be resolved entirely at the county level. Furthermore, the shift to allow electronic document transmission and fewer physical copies reduces the administrative friction between the county and the state. Less friction in the county assessor's office generally translates to faster resolutions and refunds for business taxpayers.

Follow the Money

This bill is practically a freebie for the state budget. According to the fiscal note, the legislation requires no new state appropriations and will not impact state revenue or TABOR refunds. In fact, it actually saves the state a tiny bit of labor. By raising the abatement review threshold to $20,000, the Division of Property Taxation expects to see its caseload of abatement reviews drop by about 50 percent (roughly 260 fewer reviews per year), freeing up state staff for other duties.

At the local level, county governments will see a very minor reduction in their workload and administrative costs. Moving away from mandatory paper copies and allowing single electronic submissions will save a few bucks on postage, paper, and administrative time. While it won't balance a county budget, it’s exactly the kind of commonsense modernization that local assessors have been asking the state to implement for years.

Where This Bill Stands

SB26-046 is currently Signed Into Law. The latest official action came on 03/26/2026: Governor Signed.

That means the legislative process is complete and the bill is now law. The remaining questions are about implementation timing and how agencies, businesses, or local governments respond.