How to Do Payroll in Colorado

Last reviewed: July 2026

Hiring your first employee in Colorado starts a chain of paperwork that has to happen in a specific order. Skip a step and you can end up filing withholding returns with no account number to put on them, or paying an employee before your SUI account exists. Here's the order that actually works, from opening day to your first W-2 season.

Step 1: Get a Federal EIN

Everything starts with your Employer Identification Number. The IRS issues EINs for free at irs.gov/ein, and if you apply online during business hours you'll have the number before you close the browser tab. You'll use this same EIN on every state registration that follows, so get it first.

Step 2: Register With the Colorado Department of Revenue

Colorado withholds state income tax on every paycheck, so you need a withholding account before you run one. Register through tax.colorado.gov, where the Department of Revenue issues an account number you'll use on every deposit and return.

Processing isn't instant. Some employers wait a few business days for confirmation, so don't leave this registration for the morning of your first payroll.

Step 3: Register for SUI With CDLE

State unemployment insurance is a separate registration with a separate agency: the Colorado Department of Labor and Employment. Sign up through their employer portal, and CDLE will assign you an account number along with a rate.

• New employer rate: around 1.7% for most non-construction employers in 2026, though your exact rate depends on industry classification and whether the statewide solvency surcharge applies.
• Taxable wage base: $30,600 per employee for 2026, up from $27,200 the year before.
• Filing frequency: quarterly wage reports, whether or not you paid wages that quarter.

From the Payroll Desk

CDLE mails an annual rate notice every December. File it somewhere you'll actually find it — that document, not last year's memory, is your real SUI rate.

Step 4: Set Up Withholding

Every employee fills out the federal Form W-4 when they start. Colorado adds an optional form, the DR 0004, that lets an employee fine-tune state withholding if the federal form alone doesn't match their situation. It isn't mandatory, but you're required to honor it if someone hands you a completed copy.

If your team wants help walking through allowances and additional withholding, our W-4 Helper tool breaks the form down step by step, and our paycheck calculator shows how withholding choices change take-home pay.

Step 5: Choose a Pay Frequency

Colorado requires pay periods no longer than one calendar month or 30 days, whichever is longer, with payday landing within 10 days after the period ends. Biweekly and semimonthly schedules both satisfy that rule comfortably, and most small employers pick one of those two because they line up cleanly with federal deposit schedules.

Post your payday schedule where employees can see it. Colorado requires a written notice of paydays and pay location, and it needs updating any time the schedule changes.

Step 6: Deposits and Filing Calendar

Federal payroll tax deposits follow either a monthly or semiweekly schedule based on your lookback-period liability, and Colorado withholding deposits generally track that same rhythm. Quarterly, you'll file federal Form 941 to reconcile what you withheld and deposited; our Form 941 guide walks through that filing line by line.

On the state side, expect quarterly withholding returns alongside your CDLE wage reports. Missing a deposit date is one of the most common (and most avoidable) payroll mistakes new employers make, so calendar every due date the same week you register.

Step 7: Year-End: W-2s

By January 31, every employee needs a W-2 showing wages paid and taxes withheld for the year, and the Social Security Administration needs its copy by the same date. Colorado also expects a year-end reconciliation of state withholding. Payroll software handles most of this automatically once your account numbers are entered correctly, which is one more reason to get the registrations right the first time.

Frequently Asked Questions

How often do I need to pay employees in Colorado?

Colorado law sets pay periods no longer than one calendar month or 30 days, whichever is longer, with payday falling within 10 days of the period's close. Most small employers choose biweekly or semimonthly schedules for simpler tax deposits.

What is the Colorado new employer SUI rate?

New Colorado employers generally start at an introductory unemployment insurance rate of 1.7%, applied to the first $30,600 of each employee's 2026 wages. Your exact rate depends on your industry classification and any active solvency surcharge, so confirm the figure on your CDLE rate notice.

Do I need to withhold Colorado state income tax?

Yes. Colorado has a flat state income tax and employers must withhold it from every paycheck. Most employees complete the federal Form W-4, and the optional Colorado DR 0004 lets them fine-tune state withholding if their situation calls for it.

When do I need to report a new hire in Colorado?

Within 20 calendar days of the employee's start date. Report through the Colorado State Directory of New Hires, which shares the data with child-support enforcement agencies nationwide.

Gusto handles the registrations, withholding calculations, and quarterly filings covered above, and it plugs directly into a Colorado employer's CDLE and Department of Revenue accounts once they're set up. It's worth a look if you'd rather not track deposit dates by hand: Gusto.