Boulder County Property Tax Savings Guide
For homeowners in Boulder, Lafayette, Louisville, Superior, Longmont, Erie, Nederland & the rest of Boulder County, Colorado
Here's the short version, if you're in a hurry:
- How it's calculated: Boulder County multiplies your home's actual (market) value by a state-set assessment rate to get your assessed value, then multiplies that by your area's total mill levy (city + county + school district + special districts) to get your annual bill.
- Main relief programs: a Senior Property Tax Exemption and a Disabled Veteran Exemption, each worth 50% of the first $200,000 of your home's actual value — plus a separate state PTC Rebate (up to $1,178/year) for qualifying seniors and disabled residents.
- The catch: none of these are automatic. Every one of them requires an application on file with the county, and a lot of eligible homeowners in Boulder, Lafayette, Louisville, Superior, Longmont, Erie, and Nederland have simply never filed — which means they're quietly overpaying, year after year.
- Worth knowing: the Senior Exemption wasn't funded for last year's bills, but Boulder County confirms it's back for this tax year, first showing up on the bill mailed in January 2027.
1How Your Property Tax Bill Actually Gets Calculated
If you've ever looked at your tax bill and wondered how the county landed on that number, you're not alone — most homeowners have never actually walked through the math. It comes down to two numbers multiplied together: your assessed value and your area's mill levy.
Your assessed value is not the same thing as your home's market value — the price it would sell for. Colorado applies a state-set assessment rate (a percentage, currently 7.05% for the school-district portion of your bill and 6.25% for everything else — county, city, and special districts) to your market value to get a much smaller "assessed value." That assessed value is what your local mill levy actually gets applied to.
A "mill" is $1 of tax for every $1,000 of assessed value. Add up the mills from every taxing authority that covers your property — the county, the City of Boulder (or your town), your school district, and any special districts like fire or water — and you get your total mill levy.
This example uses Boulder County's own published calculation method and the most recently certified total mill levy Boulder County has published for its core city tax area. Your exact mill levy depends on your specific tax district (which fire, water, or special districts cover your address), so treat this as a close estimate, not your literal bill — want your real number? That's what the quiz below is for.
2Exemptions & Relief Programs You May Be Missing
Boulder County offers real relief programs for homeowners who qualify — but every single one of them requires you to actually apply. None of these show up on your bill automatically. That means every year, eligible homeowners across Boulder, Lafayette, Louisville, Superior, Longmont, Erie, and Nederland simply never file, and quietly pay more than they have to.
Senior Property Tax Exemption 50% of first $200,000
Who qualifies: You turned 65 on or before January 1 of the application year, and have owned and lived in the home as your primary residence for at least 10 consecutive years.
Heads up: this exemption wasn't funded for last year's bills — Colorado's legislature has to fund it annually, and didn't for tax year 2025. Boulder County confirms it's back for this tax year, and will first appear on the bill mailed in January 2027. If you think you qualify, it's worth checking whether you're already on file.
Deadline to apply: July 15. Once approved, you don't need to reapply each year — it stays in effect until something changes (you move, sell, or transfer the property).
Disabled Veteran Exemption 50% of first $200,000
Who qualifies: Veterans with a 100% permanent service-connected disability rating (or individual unemployability status), who own and occupy the home as their primary residence. Gold Star spouses also qualify.
Deadline to apply: July 1. Like the senior exemption, it's funded through the same annual state process, and once approved it doesn't require annual reapplication — worth confirming your current status directly with the Assessor's office.
Colorado PTC Rebate Up to $1,178/yr
Who qualifies: Colorado residents 65+ (or a surviving spouse 58+, or those with a qualifying disability) with income under roughly $19,094 (single) or $25,788 (married). This is a separate state rebate filed with your Colorado income tax return, not through the Assessor — but it's real money a lot of eligible homeowners never claim.
3Why Your Bill Can Go Up Even When the Rate Goes Down
This trips up a lot of homeowners: the county or the state announces a lower assessment rate, but your bill still goes up. Here's why — there are two separate numbers involved, and they don't move together.
The assessment rate is set by the state and can go down. But your market value is reassessed by the county every odd-numbered year, based on comparable sales data. If your home's value rose enough during that reassessment cycle, your new (larger) assessed value can more than offset a lower rate — so the math still nets out to a bigger bill.
On top of that, your total mill levy isn't one single number under one authority's control. It's the sum of levies from your school district, the county, your city or town, and any special districts covering your property — and some of those can raise their own mills independent of what the state does with the residential assessment rate.
Bottom line: a headline about a "lower tax rate" doesn't guarantee a lower bill. The only way to know for sure is to look at your actual Notice of Valuation and do the math — or let us do it for you.
Find Out If You're Overpaying On Your Property Taxes
Three quick questions. Takes about a minute.
Which city or area is your home in?
What's the property address?
This comes directly to me, AJ. Your info is never sold or shared, and there's no obligation.
What is your home's assessed value?
Where should I send it?
Please fill in your name, phone, and email.
This comes directly to me, AJ. Your info is never sold or shared, and there's no obligation.
You're all set!
Thanks, there — I'll personally pull your assessed value from the county records and text it to you within a day. No obligation, just the number.
— AJ Chamberlin, Attitude Homes
The part most homeowners miss
Boulder County offers exemption and relief programs that can lower this number — but every one of them requires an application, and a lot of eligible homeowners have simply never filed. I'm happy to take a look at your property's record and let you know what you might qualify for, at no cost.
This is an estimate only. Your exact bill depends on your specific tax district and any exemptions already on file — confirm exact amounts with the Boulder County Assessor's office.
303.588.8999
Call or Text AJCommon Questions
What does "assessed value" actually mean?
It's not your home's market value. It's a smaller number the county calculates by applying a state-set percentage (currently 7.05% for schools, 6.25% for everything else) to your market value. Your mill levy is applied to this assessed value, not your full market value, to get your tax bill.
How do I check if I'm already receiving an exemption?
Your Notice of Valuation and your tax bill both show any exemptions currently applied to your property. If you're not sure how to read it, or just want a second set of eyes, send me your address and I'll pull your record and let you know.
When are Boulder County property taxes due?
You can pay in two installments — the first due March 2, the second due June 15 — or pay the full amount at once by April 30.
Can I appeal my assessment?
Yes. Boulder County mails Notices of Valuation around May 1 each year, and the protest window typically runs through June 8. Full countywide reassessments happen in odd-numbered years (the next is 2027), though limited appeals (for things like new construction) can still come up in other years.
Where can I find my home's assessed value?
Boulder County's own property search tool, your mailed Notice of Valuation, or your most recent tax bill will all show it. If you'd rather not dig through it yourself, use the quiz above and I'll send it to you.
Do I need to reapply for exemptions every year?
No. Once the Senior or Disabled Veteran exemption is approved, it stays in effect until something changes — you move, sell, or transfer the property into a trust or LLC. You do not need to refile annually.
This page is general information, not tax or legal advice. Tax figures are estimates based on the most recently published Boulder County data available at the time of writing and can vary by exact tax district and property. Confirm exact amounts, current exemption status, and eligibility with the Boulder County Assessor's office.
Still not sure if you're overpaying?
It takes one minute to find out, and there's no cost or obligation to check. I'm happy to look into it for you personally.