Taxes in Westminster
Westminster's tax picture is genuinely more complex than Arvada's or Centennial's due to its real two-county split -- combined sales tax runs 8.75% in the Jefferson County portion versus 9.0% in the Adams County portion, on top of Colorado's flat 4.40% state income tax.
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Learn moreSales tax genuinely differs by which county portion an address sits in
Westminster's combined sales tax rate is 8.75% in the Jefferson County portion of the city versus 9.0% in the Adams County portion -- a real, disclosed within-city variation stemming directly from the two-county split. The city's own sales/use tax rate was adjusted to 4.25% for all taxable transactions on or after January 1, 2026.
A real, favorable property tax rate -- but only confirmed for the Jefferson County portion
Westminster is cited as having the LOWEST effective property tax rate within Jefferson County specifically, at 0.46% -- a real, sourced, favorable figure, but explicitly a Jefferson-County-portion figure only. No equivalent Adams-County-portion-specific effective rate was resolved this pass, disclosed as a gap rather than assumed equal.
Colorado's flat income tax applies identically across the city
Colorado's flat 4.40% state income tax for 2026 (subject to the same TABOR surplus-refund mechanism documented for Arvada and Centennial) applies to Westminster residents regardless of which county portion they live in.
Retirees should note Colorado's 2026 retirement-income tax changes
Starting tax year 2026, Colorado SB25-136 removes the dollar caps on the state's pension/retirement-income subtraction entirely -- the same statewide change documented for Arvada, applying identically to Westminster residents; see the retiring topic for the fuller picture.
Key takeaways
- Combined sales tax genuinely differs by county portion: 8.75% (Jefferson County portion) vs. 9.0% (Adams County portion).
- Westminster's Jefferson-County-portion effective property tax rate (0.46%) is cited as the lowest within Jefferson County -- but no Adams-County-portion figure was resolved this pass.
- Colorado's flat 4.40% state income tax (2026) applies identically across both county portions of the city.
- Colorado's SB25-136 removes retirement-income subtraction caps starting tax year 2026 -- a real, favorable change for retirees.
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