Colorado Tax Withholding Requirements for Employers

Colorado tax withholding requirements for employers start with a single rate and a single duty: withhold 4.40% of each employee’s adjusted taxable wages for 2026 and send that money to the Colorado Department of Revenue on the schedule the DOR assigns you. The obligation covers Colorado residents wherever they work and nonresidents for any hours they physically work inside the state. You are the collecting agent, and you are personally liable for the tax whether or not you actually deducted it from the paycheck.

Register Before You Withhold a Dollar

Open a wage withholding account with the Department of Revenue before running your first Colorado payroll. The application is Form CR 0100, the Colorado Sales Tax and Withholding Account Application, filed online or on paper.¹ The DOR issues you a Colorado Account Number that goes on every return and every piece of correspondence.²

Keep records of total wages paid and Colorado tax withheld for each employee. The IRS requires employment tax records to be retained at least four years after the tax is due or paid, whichever is later.³ Those records feed your annual reconciliation and are what you’ll reach for in an audit.

Collect the Right Withholding Certificate

Every new hire submits a federal Form W-4, and Colorado uses that W-4 by default to calculate state withholding. If the employee gives you nothing else, the W-4 alone drives the state calculation, and the default is designed to cover the employee’s full-year Colorado liability, usually producing a small refund at filing time.⁴

Employees who want to adjust their Colorado withholding separately from federal can submit Form DR 0004, the Colorado Employee Withholding Certificate. It lets them claim a different exemption amount, request additional withholding, or reduce withholding when they expect large deductions. When an employee hands you a DR 0004, calculate state withholding from that form instead of from the W-4.⁵

Calculate the Withholding

The calculation method lives in Form DR 1098, the Colorado Withholding Worksheet for Employers.⁶ The worksheet takes gross wages for the pay period and adjusts them for filing status, standard deduction, and any additional instructions from the W-4 or DR 0004. For 2026 the built-in standard deduction is $11,000 for married filing jointly and qualifying surviving spouse, and $5,500 for every other filing status.⁷

Apply the flat 4.40% state rate to the adjusted result. Payroll software runs the same math automatically; the DR 1098 is the manual version.

Bonuses, Commissions, and Other Supplemental Wages

Irregular payments such as bonuses, commissions, and severance are treated as supplemental wages. You can withhold at a flat rate equal to the income tax rate rather than running the full DR 1098 calculation. For 2026 that flat supplemental rate is 4.40%.

Nonresidents Who Work in Colorado

Employees who live outside Colorado but perform services inside the state owe Colorado tax on the wages tied to that in-state work, and you must withhold on that portion. An employee counts as physically present in Colorado on any day they spend the majority of their working hours here, including travel time into the state to perform services.⁸

For nonresidents who split a pay period between Colorado and other states, apportion wages by the ratio of Colorado workdays to total workdays. Four Colorado days out of twenty means 20% of that period’s wages are subject to Colorado withholding.⁸

Some nonresidents are outside the withholding rule entirely: rail, air, and motor carrier employees who work across multiple states; active-duty servicemembers and their spouses stationed in Colorado under military orders; and employees who telecommute from outside Colorado even when the employer is based in the state.⁸

How Often You File and How You Pay

The DOR assigns your filing frequency based on annual Colorado withholding liability, and there are three tiers:⁹

Weekly, for annual withholding above $50,000. Tax accumulated through any Friday is due by the third business day after that Friday.¹⁰
Monthly, for annual withholding of at least $7,000 but not more than $50,000. Returns and payment are due by the 15th of the following month.
Quarterly, for annual withholding under $7,000. Returns and payment are due by April 30, July 31, October 31, and January 31.

The periodic return is Form DR 1094, the Colorado W-2 Wage Withholding Tax Return, filed and paid through the DOR’s Revenue Online portal.¹¹ Weekly filers must pay by Electronic Funds Transfer.¹² Everyone else can pay by e-check, credit card, or debit card through Revenue Online.¹³ File a return for every assigned period even in periods with zero wages and zero withholding.

Year-End Reconciliation

After the calendar year closes, reconcile the total tax withheld from employees against the total you remitted on your DR 1094 filings. The reconciling form is DR 1093, the Annual Transmittal of State W-2 Forms, which ties your individual W-2s to your periodic payments.¹⁴

Employees must receive their W-2 by January 31 following the tax year.¹⁵ The same January 31 deadline applies to filing the DR 1093 and submitting all W-2 copies to the DOR.¹⁶ Employers filing large numbers of W-2s must submit electronically through Revenue Online. Mismatches between the DR 1093 totals and your remitted payments will generate a notice and can trigger a payroll audit.

What Late or Missed Payments Cost

The Colorado penalty for filing or paying withholding tax late is the greater of $5 or 5% of the unpaid tax plus an additional 0.5% for each full or partial month the balance stays unpaid, capped at 12% of the tax owed.¹⁷ The penalty starts on the original due date, so even a few days late triggers the 5% floor.

Interest runs on top of the penalty. For 2026 the DOR charges 8% annual interest if you pay before receiving a notice of deficiency, or within 30 days after one is issued. After that, the rate rises to 11%.¹⁷ The DOR can impose additional penalties for willful failure to file, fraudulent returns, or negligent disregard of the withholding rules.

Withheld tax is a trust fund. The money belongs to the employee and the government from the moment it comes out of the paycheck. Officers, owners, and anyone with authority over payroll can be held personally liable for unremitted trust-fund taxes even if the business becomes insolvent.

Federal deposit penalties run separately and can stack on top of the state ones. The IRS uses a tiered schedule: 2% for deposits 1 to 5 days late, 5% for 6 to 15 days late, and 10% for more than 15 days late. If tax is still unpaid 10 days after the IRS issues a formal notice, the penalty rises to 15%.¹⁸

Closing Your Withholding Account

If you stop paying Colorado wages, close the account. File Form DR 1108, the Business Tax Account Closure Form, and identify which accounts you’re closing and the effective date.¹⁹ Leave the account open and the DOR may assess tax for periods you had no activity.

Before you close, pay final wages, make any remaining deposits, and file the last DR 1094 for the period. The annual DR 1093 reconciliation and W-2 distribution are still due for any year in which you paid wages. Notify the IRS and file final federal employment tax returns as well.²⁰ Keep payroll records at least four years past the final tax payment; both the DOR and the IRS can audit closed accounts inside that window.³

One Related Obligation to Not Overlook

Income tax withholding is not the only payroll obligation Colorado imposes on employers. Every business with at least one employee must also register with the Family and Medical Leave Insurance (FAMLI) Division through the My FAMLI+ Employer portal and remit quarterly FAMLI premiums.²¹ FAMLI is administered separately from the DOR and has its own rates, wage base, and deadlines; registering for a withholding account does not register you for FAMLI.

1
Department of Revenue – Taxation. CR 0100 – Colorado Sales Tax and Withholding Account Application
2
Colorado Department of Revenue. Instructions for the Colorado Sales Tax and Withholding Account Application
3
Internal Revenue Service. Topic No. 305, Recordkeeping
4
Colorado Department of Revenue. Colorado Employee Withholding Certificate
5
Colorado Department of Revenue. 2026 Colorado Employee Withholding Certificate
6
Department of Revenue – Taxation. DR 1098 – Colorado Withholding Worksheet for Employers
7
Colorado Department of Revenue. 2026 Colorado Withholding Worksheet for Employers
8
Colorado Department of Revenue. Colorado Wage Withholding Tax Guide
9
Department of Revenue – Taxation. Colorado Tax Withholding Requirements for Employers – Section: What Is My Filing Frequency?
10
Department of Revenue – Taxation. Colorado Taxes and Fees Due Date Guide
11
Department of Revenue – Taxation. Colorado W-2 Wage Withholding Tax Return
12
Department of Revenue – Taxation. Colorado Wage Withholding Tax Guide
13
Department of Revenue – Taxation. File Withholding Online
14
Colorado Department of Revenue. DR 1093 – Annual Transmittal of State W-2 Forms
15
Social Security Administration. Deadline Dates to File W-2s
16
Colorado Department of Revenue. DR 1093 – Annual Transmittal of State W-2 Forms
17
Department of Revenue – Taxation. Tax Topics: Penalties and Interest
18
Internal Revenue Service. Failure to Deposit Penalty
19
Department of Revenue – Taxation. DR 1108 – Business Tax Account Closure Form
20
Internal Revenue Service. What Business Owners Need to Do When Closing Their Doors for Good
21
Family and Medical Leave Insurance. Employers