Colorado Amendment 87
Graduated income tax · November 3, 2026 · Tax year 2027
What Amendment 87 would do
Colorado Amendment 87 would replace the 4.4% flat income tax with six rates from 3.7% to 8.4%, starting in tax year 2027.
What changes if it passes
- Applies the same rate schedule to estates, trusts and C corporations.
- Keeps the 4.4% rate on gains from selling a principal residence above the federal exclusion.
- Lets the state keep and spend the added revenue as a voter-approved revenue change under TABOR.
Estimates at a glance
Change in individual income tax revenue, tax year 2027
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PolicyEngine estimate
Official estimate
+$635.7M
Legislative Council Staff, 2026 Blue Book, Table 3, individual taxpayers, 2023 incomes
Tax returns paying more / less
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Returns whose state income tax rises or falls (a joint return counts once)
Current law and if it passes
| Group | Current law | If it passes |
|---|---|---|
| $0 to $25,000 | 4.4% | 3.7% |
| $25,000 to $100,000 | 4.4% | 4.2% |
| $100,000 to $500,000 | 4.4% | 4.4% |
| $500,000 to $750,000 | 4.4% | 7.4% |
| $750,000 to $1 million | 4.4% | 7.9% |
| Over $1 million | 4.4% | 8.4% |
Who is affected
According to the Blue Book, taxes fall for filers with Colorado taxable income below $510,834 and rise at $510,834 and above.
Key facts
- Vote needed
- A majority vote.
- Takes effect
- Tax years beginning on or after January 1, 2027.
- Years modeled
- Tax year 2027