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Colorado
Employee Obligations (Which Returns YOU Must File)
If you physically work in Colorado, file a nonresident Colorado return (tax rate: Flat 4.4%). Then file your Arizona return and claim the Form 309 credit so you don't get taxed twice on the same income.
Employer Obligations (What Your Employer Must Withhold & Remit)
Register for withholding, unemployment, and FAMLI from day 1. Must withhold the employee FAMLI share. Unemployment applies to the first $30,600. FAMLI employer contribution is 0.44% on wages up to $184,500. Effective January 1, 2026, FAMLI benefit payments are subject to FICA and FUTA for employers with 10 or more employees; FAMLI handles employee-side FICA withholding on benefit payments.
City & Local Income Taxes (Extra Filings Beyond the State Return)
Denver charges a flat $5.75/month Occupational Privilege Tax (not a percentage). Greenwood Village $2/month, Sheridan $3/month, Glendale $5/month. Aurora eliminated its tax in January 2025.
Other Paycheck Deductions (Disability, Paid Leave, Unemployment)
FAMLI 0.44% on wages up to $184,500.
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This is general information, not tax or legal advice. Laws change frequently. Always consult a licensed CPA or tax attorney for your specific situation. All information researched as of March 21, 2026.