Colorado payroll taxes come in four layers on top of federal obligations: a flat 4.40% state income tax withheld from each paycheck, unemployment insurance premiums paid by the employer on the first $30,600 of each worker’s annual wages, Family and Medical Leave Insurance contributions of 0.88% split evenly between employer and employee, and in some cities a monthly occupational privilege tax on both the business and the worker. Liability starts as soon as you cross modest wage or headcount thresholds, and the penalties for missing a filing or misclassifying a worker are heavy.
State Income Tax Withholding
Colorado uses a flat income tax rate rather than brackets. For 2026, employers withhold 4.40% of each employee’s wages. The rate has dropped below 4.40% in some past years when state revenues triggered TABOR refunds (the 2024 effective rate was 4.25%), but you should withhold at 4.40% unless the state announces a change.
Withholding is calculated from each employee’s federal Form W-4 unless the worker submits a Colorado Employee Withholding Certificate (Form DR 0004). The DR 0004 is optional. If an employee skips it, you base Colorado withholding on the federal W-4, which is designed to approximate the correct state tax over the year.1Colorado Department of Revenue. DR 0004 – Colorado Employee Withholding Certificate
Every dollar you withhold is legally held in trust for the state. Colorado takes a super-priority lien on all business assets for unremitted withholding, and an employer who fails to withhold the right amount is personally liable for the shortfall even if the employee later pays the tax on their own return. The only defense is reasonable cause rather than neglect.2Justia Law. Colorado Code 39-22-604 – Withholding Tax
Unemployment Insurance Premiums
Colorado employers pay unemployment insurance on the first $30,600 of each employee’s annual wages for 2026. This chargeable wage base adjusts each year.3Department of Labor & Employment. Premium Rates Once a worker’s year-to-date wages pass that mark, you owe no further UI premiums on them for the rest of the calendar year. The employer carries the full cost; nothing comes out of the employee’s paycheck.
Experienced employers pay a rate between 0.56% and 7.34% based on their claims history. New businesses without an experience rating get introductory rates by industry:
- Non-construction, general construction, and trades: 3.05% combined rate
- Heavy construction: 6.285% combined rate
- Political subdivisions: 0.20%
These combined rates roll a beginning rate, support rate, and surcharge together.4Department of Labor & Employment. Introductory Rates
Quarterly UI wage reports and payments are due the last day of the month following each quarter: April 30, July 31, October 31, and January 31.5Department of Labor & Employment. How To Submit a Wage Report in MyUI Employer+ for Employers
Family and Medical Leave Insurance
FAMLI funds paid leave for qualifying life events through a premium of 0.88% of wages for 2026, split evenly: 0.44% from the employer and 0.44% from the employee.6Family and Medical Leave Insurance (FAMLI). Premium and Benefits Calculator You withhold the employee’s share from each paycheck, add your own share, and remit the full amount quarterly.
Businesses with nine or fewer employees are not required to pay the employer’s half. They still must withhold and remit the employee’s 0.44%, but only that amount.7Family and Medical Leave Insurance (FAMLI). Employers Any employer may voluntarily cover the employee’s portion as a benefit.
FAMLI premiums apply only up to the Social Security wage cap, $184,500 for 2026. Wages above that are not subject to the premium.
Local Occupational Privilege Taxes
Several Colorado cities add a monthly head tax, called an occupational privilege tax, on both the employer and any employee working within city limits. These are separate from state obligations and the state does not collect them for you. Denver charges $5.75 per employee per month, plus $4.00 per month paid by the employer.8City and County of Denver. Business Tax FAQ Aurora, Glendale, Sheridan, and Greenwood Village all have their own versions with different thresholds and amounts. If your workers are spread across multiple municipalities, you may need to register and file in each one.
When You Become a Liable Employer
A Colorado business becomes liable for unemployment insurance, and in practice for the full payroll tax stack, when either of two tests is met. The wage test: paying $1,500 or more in total wages during any calendar quarter in the current or prior year. The headcount test: employing at least one person for any part of a day in 20 different weeks in a calendar year. The weeks don’t have to be consecutive, and it doesn’t have to be the same employee each week.9Department of Labor & Employment. Employer Liability Chart
Buying an existing business that already carries UI liability transfers that obligation to the new owner, along with the predecessor’s experience rating. This covers acquisitions, mergers, and purchases of a substantial portion of the prior business’s assets.10Department of Labor & Employment. Unemployment Insurance Premiums
Registering and Filing
New employers register through the MyBizColorado portal, which connects to both the Department of Revenue and the Department of Labor and Employment.11colorado.gov. MyBizColorado Have ready your Federal Employer Identification Number, NAICS code, legal and trade names, and the Social Security numbers of all owners or officers.
For state withholding, the key form is CR 0100, the Colorado Sales Tax and Withholding Account Application.12Colorado Department of Revenue – Taxation. CR 0100 – Colorado Sales Tax and Withholding Account Application The estimated monthly withholding you enter sets your filing frequency. Unemployment insurance accounts are managed through MyUI Employer+.13Department of Labor & Employment. Starting a Business
Colorado assigns your withholding filing frequency by annual volume:
- Less than $7,000 per year: quarterly, due the last day of the month following the quarter.
- $7,000 to $50,000 per year: monthly, due by the 15th of the following month.
- More than $50,000 per year: weekly, due the Wednesday after the pay-period week ends.
The state may change your frequency as your payroll grows.14Department of Revenue – Taxation. Withholding Filing Frequency and Due Dates
By January 31 each year, you must file Form DR 1093, the Annual Transmittal of State W-2 Forms, reconciling the withholding on all employee W-2s against what you actually remitted.15Department of Revenue – Taxation. DR 1093 – Annual Transmittal of State W-2 Forms Mismatches are one of the fastest ways to draw a notice from the Department of Revenue.
New Hire Reporting
You must report every new hire and rehired employee to the Colorado State Directory of New Hires within 20 calendar days of the hire date. If the employee’s first scheduled payroll falls after that window, the report can go in with that payroll instead. Employers filing electronically must submit at least twice per month, spaced between 12 and 16 days apart.16Colorado Child Support Services. New Hire Reporting The data feeds child support enforcement and fraud detection.
Penalties That Hurt the Most
Worker Misclassification
Treating a worker as an independent contractor when they’re really an employee is more than a back-tax problem. Colorado treats willful misclassification as a separate violation with escalating fines: up to $5,000 per misclassified worker for a first offense, and up to $25,000 per worker for a second or subsequent offense, plus a ban on state contracts for up to two years.17FindLaw. Colorado Code 8-72-114 – Misclassification Penalties These stack on top of the unpaid UI premiums, FAMLI contributions, and withholding you should have been remitting. The Department of Labor and Employment accepts anonymous complaints and runs its own investigations.
Late Filing and Non-Payment
Colorado charges both penalties and interest on late or missing payroll tax payments. For withholding, the consequences go further. Because withheld amounts are held in trust, a business that collects withholding but fails to remit it faces a statutory lien that sits ahead of every other claim on the business’s assets, including secured creditors and other tax liens.2Justia Law. Colorado Code 39-22-604 – Withholding Tax That makes withholding one of the last obligations a struggling business should let slip.
Responsible individuals, including officers, owners, and anyone with authority over the company’s finances, can be held personally liable for unremitted amounts even when the business is an LLC or corporation. Colorado imposes escalating percentage-based penalties for late filings and charges interest that compounds daily. The state may reduce penalties for reasonable cause, but interest is rarely waived even when penalties are abated.