Longmont, Colorado sales tax rate: 8.865%
Last updated Checked monthly
The sales tax rate in Longmont, Colorado is 8.865%. That’s the 2.9% state rate plus 5.965% in local taxes. It’s higher than 83 of the 114 Colorado cities we checked.
Calculated by the 
Sales Tax APIThe same engine Zamp customers use.Longmont combined rate
8.865%
- Colorado state
- 2.9%
- Boulder CountyCounty
- 1.335%
- LongmontCity
- 3.53%
- Scientific And Cultural Facilities DistrictSpecial district
- 0.1%
- Regional Transportation DistrictSpecial district
- 1%
Longmont sales tax calculator
Enter a price and what you’re selling.
- ColoradoState · 2.9%$2.90
- Boulder CountyCounty · 1.335%$1.34
- Longmont CityCity · 3.53%$3.53
- Scientific And Cultural Facilities DistrictSpecial district · 0.1%$0.10
- Regional Transportation DistrictSpecial district · 1%$1.00
Charging this at checkout? Zamp calculates it on every order and files the returns.
Book a demoLongmont sales tax rate breakdown
State, county, city and special district taxes add up to 8.865%. District lines don’t follow city limits, so some Longmont addresses pay a different rate.
| Jurisdiction | Type | Rate |
|---|---|---|
| State of Colorado | State | 2.9% |
| Boulder County | County | 1.335% |
| Longmont City | City | 3.53% |
| Scientific And Cultural Facilities District | Special district | 0.1% |
| Regional Transportation District | Special district | 1% |
| Combined rate | 8.865% |
Rate history
- July 20238.715%
- July 20248.715%
- July 20258.715%
- July 20268.865%
- Today8.865%
Changed since July 2023.
Charge the right rate in Longmont, on every order.
Zamp calculates tax at each customer’s address, special districts included, then files and pays every Colorado return for you, with a sales tax team you can call.
Longmont sales tax questions.
Still have questions? Call us at 1-866-438-9267 or email us at support@zamp.com.
What is the sales tax rate in Longmont, Colorado?
The combined sales tax rate in Longmont is 8.865% as of November 2, 2026. It’s made up of 2.9% Colorado state tax, 1.335% Boulder County, 3.53% Longmont City, 0.1% Scientific And Cultural Facilities District, 1% Regional Transportation District.
Why does Longmont pay Scientific And Cultural Facilities District and Regional Transportation District tax?
Special districts such as Scientific And Cultural Facilities District and Regional Transportation District levy their own sales tax on top of the state, county and city rates. District lines don’t always follow city limits, so an address a few streets away can have a different rate. This rate was calculated for Longmont’s 80502 ZIP code; the calculator prices any exact address.
Is SaaS taxable in Longmont?
No.
Do online sellers have to collect sales tax in Longmont?
Yes, if they have nexus in Colorado: more than $100,000 in Colorado sales in the previous or current calendar year, or a physical presence in the state. They register with the Colorado Department of Revenue and charge the rate at the buyer’s address.
Sources. Colorado Department of Revenue · Zamp Sales Tax API, for Longmont’s 80502 ZIP code. Rates are checked monthly and are for information, not tax advice.
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