Colorado tax forms & filing.

Things to know about filing in Colorado

• Colorado's Taxpayer's Bill of Rights (TABOR) frequently produces state-level rate cuts and refund mechanisms when revenue exceeds limits. These TABOR refunds change every year — we watch for the announced rate and apply on the current return.
• Colorado conforms broadly to federal AGI as the starting point but adds back certain items (e.g., federal bonus depreciation in some years) and offers state-specific subtractions for retirement income, military pension, and qualifying capital gains on Colorado-source assets.
• If you work in Colorado but live elsewhere — common for remote employees of Boulder/Denver tech companies — you may owe nonresident Colorado tax on the Colorado-source wages. Withholding handles most of this; the return reconciles it.

Colorado TABOR refunds — what they are and when they apply

Colorado's Taxpayer's Bill of Rights (TABOR), enshrined in the state constitution since 1992, limits state revenue growth to inflation plus population. When state revenue exceeds the TABOR cap, the surplus must be refunded to taxpayers.

TABOR refunds have taken different forms over the years: rate cuts, flat per-taxpayer refund checks, sales-tax refunds, and adjustments to deductions. The specific mechanism is determined each year by the legislature based on the surplus amount.

Practical effect: Colorado residents periodically receive unexpected state-level refunds in addition to their normal return-based refund. The amount and form change yearly. We track the announced TABOR mechanism each filing season and apply it correctly to client returns.

Metro Denver special-district considerations

Denver and surrounding metro communities operate under multiple overlapping special districts that levy property tax, sales tax, and occasionally other assessments. These don't affect the state income tax return directly but matter for total tax-burden modeling.

Self-employed Colorado filers operating in metro Denver may owe Denver occupational privilege tax ('head tax') on top of state and federal obligations. The OPT is administered by Denver Treasury and is a payroll-based tax separate from any state filing.

We don't handle property-tax or special-district filings directly, but we flag exposure at intake when reviewing total tax burden for relocation or business-formation decisions.

Where's my refund?

The Colorado Department of Revenue runs the official refund-status tracker. You'll need your Social Security number, filing status, and exact refund amount (in some cases, the tax year and a return-amount input).

Check your Colorado refund status →

Multi-state considerations

If you lived or worked in more than one state during the tax year, you typically file a part-year resident return in each state. If you live in one state and work in another, you usually file as a resident where you live and as a nonresident in the work state — claiming a credit on the resident return for taxes paid to the work state. Reciprocity agreements between some neighboring states change this default; we map this out at intake.

Colorado-specific multi-state nuances are addressed in the quirks list above when they apply.

Get the current-year forms

State tax rates, brackets, and forms change every year. We point to the Colorado Department of Revenue as the authoritative source for current-year information. Form numbers above are stable; rates, deduction amounts, and credit limits are not — always verify before relying on a specific dollar amount.

Open the Colorado Department of Revenue website →