Taxes in Highlands Ranch
Highlands Ranch's tax picture is genuinely simpler on the sales-tax side than its incorporated Douglas County neighbors -- no municipal layer, since there's no city government -- but genuinely more layered on the property-tax side, where the Highlands Ranch Metro District's own levy stacks on top of the standard county and school district rates.
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Learn moreColorado's flat, TABOR-variable state income tax
Colorado's flat income tax rate is 4.40% for 2026 -- not fully fixed, since a TABOR-driven refund mechanism can temporarily lower it further in years the state certifies a qualifying revenue surplus (it applied for tax year 2024, specifically, not for 2025). See colorado.js for the full mechanism.
Sales tax: 5.0% combined, no municipal layer
Highlands Ranch's combined sales tax rate is 5.00%: 2.90% Colorado state + 1.00% Douglas County + 1.10% special district (Regional Transportation District 1.0% + Scientific and Cultural Facilities District 0.1%). Because Highlands Ranch is unincorporated, there is NO city sales tax layer -- a genuinely lower combined rate than incorporated Parker (8.0%) or Castle Rock (8.1%), both of which add their own municipal rate on top of this same base.
Property tax: a genuinely multi-layered bill, with one figure disclosed as unresolved
Douglas County's own average effective property tax rate runs around 0.55% -- cited as among the higher rates of Colorado's major counties specifically because of heavy special-district (metro district) layering, even though Colorado's own statewide average (~0.50%) is low nationally. The Highlands Ranch Metro District's own 2025 mill levy is 12.250 (below its voter-capped 12.750 maximum) -- but this is only one layer; Douglas County's own mill levy and the Douglas County School District's mill levy also apply, and a single combined effective rate for a specific Highlands Ranch parcel was not resolved to one verified figure this research pass. Confirm directly with the Douglas County Assessor for a specific address.
Key takeaways
- Colorado's flat state income tax is 4.40% for 2026 (TABOR-variable).
- Highlands Ranch's combined sales tax rate is 5.00% -- genuinely lower than incorporated Parker's (8.0%) or Castle Rock's (8.1%), since there is no municipal sales tax layer here.
- Douglas County's average effective property tax rate runs around 0.55%, and the Highlands Ranch Metro District adds its own 12.250-mill 2025 levy on top of the county and school district's own separate levies -- a full combined effective rate for a specific parcel was not resolved to one verified figure this pass.
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