Starting a Business in Denver: What You Need to Know

Step 1: Choose the Right Business Structure

Before you do anything else — get a logo, sign a lease, or open a bank account — you need to decide how your business will be structured legally. This single decision affects your taxes, your personal liability, and how complicated your accounting will be for years to come.

The most common options for Denver small businesses:

• Sole Proprietorship — Simple to start, but no liability protection. Your personal assets are on the line.
• LLC (Limited Liability Company) — The most popular choice for small businesses in Colorado. Offers liability protection and flexible tax treatment.
• S-Corporation — Often the right move once your business is generating consistent profit. Can save self-employed business owners thousands in taxes each year.
• C-Corporation — Typically reserved for businesses planning to raise venture capital or go public.

Not sure which one is right for you? This is one of the most valuable conversations you can have with a CPA before you file anything. Entity selection done wrong is expensive to fix.

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Step 2: Register with the State of Colorado

Colorado makes this relatively straightforward. You'll register your business with the Colorado Secretary of State's office, which can be done online at sos.colorado.gov. LLCs in Colorado also require filing Articles of Organization and paying a registration fee.

You'll also need to obtain an EIN (Employer Identification Number) from the IRS — think of it as a Social Security Number for your business. It's free, and you'll need it to open a business bank account, hire employees, and file taxes.

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Step 3: Understand Denver's Local Tax Requirements

Denver businesses are subject to both Colorado state taxes and Denver-specific taxes and licenses. This is where a lot of new business owners get tripped up.

• Denver Business License — Required for most businesses operating within city limits.
• Denver Occupational Privilege Tax (OPT) — A head tax on employees working in Denver. Both the employer and employee pay a portion.
• Sales Tax — Denver has a combined sales tax rate that includes state, county, and city components. If you sell taxable goods or services, you'll need to collect and remit this.
• Colorado Wage Withholding — If you have employees, you're required to withhold state income tax from their wages.

Denver's tax environment is manageable — but it does require attention to detail. Missing a filing deadline or underreporting can create headaches that are far more time-consuming than just getting it right from the start.

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Step 4: Set Up Your Accounting System Early

We've seen what happens when business owners wait too long to get their books in order. It's not pretty. Setting up a clean, organized accounting system in month one — not month twelve — saves you time, stress, and usually a fair amount of money.

At minimum, you should have:

• A dedicated business bank account (never comingle personal and business funds)
• A simple chart of accounts set up in accounting software (QuickBooks, Xero, or similar)
• A process for tracking receipts and expenses
• A calendar reminder for estimated quarterly tax payments

If this feels overwhelming, a bookkeeper or virtual CFO can take this off your plate entirely — and it's more affordable than most people expect.