What payroll deadlines should employers track?

Payroll Tax Deadlines for Employers in Colorado

Employers operating in Colorado must track several key payroll tax deadlines to maintain compliance and avoid penalties. Staying organized with these dates ensures timely tax deposits and filings at both the state and federal levels.

Federal Payroll Tax Deadlines

• Federal Tax Deposits: Employers must deposit federal income tax withheld, Social Security, and Medicare taxes according to their deposit schedule (monthly or semi-weekly). Use the Electronic Federal Tax Payment System (EFTPS) for payments.
• Form 941 Filing: File Form 941 quarterly to report federal payroll taxes withheld and paid. Deadlines are generally April 30, July 31, October 31, and January 31 for the previous quarter.
• Form W-2 and W-3: Provide employees with Form W-2 by January 31 and file Form W-3 with the Social Security Administration by the same date.

Colorado State Payroll Tax Deadlines

• Colorado Withholding Tax Deposits: Employers must deposit state income tax withheld based on their assigned deposit schedule (monthly, quarterly, or semi-weekly). Deposits are made through the Colorado Department of Revenue's Revenue Online portal.
• Quarterly Withholding Returns: File Form DR 1094 (Withholding Tax Return) quarterly by the last day of the month following the quarter (April 30, July 31, October 31, January 31).
• Unemployment Insurance (UI) Tax: Colorado employers must report and pay UI taxes quarterly. File Form UITR-1 and remit payment by the last day of the month following the end of the quarter.

Operational Tips for Managing Payroll Deadlines

• Automate Reminders: Use payroll software or calendar alerts to track deposit and filing deadlines to avoid late payments.
• Maintain Accurate Records: Keep detailed payroll records, including employee wages and tax withholdings, to support filings and audits.
• Coordinate with Payroll Providers: If using a third-party payroll service, confirm their schedule aligns with state and federal deadlines.
• Stay Updated: As of 2026, review Colorado Department of Revenue and IRS websites regularly for any changes in deadlines or filing requirements.