Does Colorado tax RSU income the same as wages?

Yes. Colorado treats RSU ordinary income as wages, taxable at the state's top marginal rate of 4.4%. Supplemental-wage federal withholding (22%, or 37% above $1M YTD) does not adjust for state withholding, so you often owe extra at filing.

What happens if I exercise ISOs while living in Colorado?

Colorado does not run a separate state AMT, so only federal AMT applies. You still need to model the bargain element carefully if you plan a cashless exercise-and-sell.

I moved to Colorado from another state. Who taxes my vesting RSUs?

Most high-tax states (CA, NY, MA) source RSU ordinary income to workdays between grant and vest. If your grant pre-dates your Colorado move, expect the old state to tax the portion of each tranche attributable to workdays earned there. Colorado taxes the remainder.

Can I reduce Colorado taxes by timing my RSU sales?

Colorado taxes long-term capital gains at the same rate as ordinary income, so timing alone does not produce a state savings — only federal. Holding for 12 months still halves the federal rate on gains above basis.

ESPP taxation in Colorado: ordinary income, qualifying dispositions, and payroll

What Colorado residents actually pay

Colorado taxes ordinary income at a top marginal rate of 4.4%. RSU settlement value, NSO exercise spread, and ESPP discount income all count as ordinary wages for this purpose and flow through the state's normal brackets.

Flat 4.4% state rate. Denver has become a meaningful secondary tech hub.

Two taxable events, one plan

An ESPP produces two taxable events. The first is ordinary discount income at purchase (for non-qualified plans or disqualifying dispositions of qualified plans), which Colorado taxes at up to 4.4%. The second is capital gain or loss on sale, taxed at long- or short-term rates federally and at 4.4% if held as ordinary state income.

Qualifying disposition math

A qualifying disposition requires you hold the shares two years from offering date and one year from purchase. Holding that long converts some of the gain to long-term federal capital gains, which for a high earner in Colorado still costs 4.4% state plus federal LTCG rates. The trade-off: two years of concentration risk in your employer's stock.

Payroll reporting

Discount income at purchase flows through W-2 Box 1 and is withheld on payroll. The cost basis reported on Form 1099-B usually excludes the W-2 income component, so you must adjust on Form 8949 to avoid double-taxation. This is the most common ESPP filing error.

Frequently asked

Does Colorado tax RSU income the same as wages?: Yes. Colorado treats RSU ordinary income as wages, taxable at the state's top marginal rate of 4.4%. Supplemental-wage federal withholding (22%, or 37% above $1M YTD) does not adjust for state withholding, so you often owe extra at filing.
What happens if I exercise ISOs while living in Colorado?: Colorado does not run a separate state AMT, so only federal AMT applies. You still need to model the bargain element carefully if you plan a cashless exercise-and-sell.
I moved to Colorado from another state. Who taxes my vesting RSUs?: Most high-tax states (CA, NY, MA) source RSU ordinary income to workdays between grant and vest. If your grant pre-dates your Colorado move, expect the old state to tax the portion of each tranche attributable to workdays earned there. Colorado taxes the remainder.
Can I reduce Colorado taxes by timing my RSU sales?: Colorado taxes long-term capital gains at the same rate as ordinary income, so timing alone does not produce a state savings — only federal. Holding for 12 months still halves the federal rate on gains above basis.