How to Start a 501c3 Nonprofit in Colorado: IRS Application and State Filings

How to Start a 501(c)(3) Nonprofit in Colorado: IRS Application and State Filings

Starting a 501(c)(3) nonprofit in Colorado requires two parallel processes: registering with the state as a nonprofit corporation, and obtaining federal tax-exempt status from the IRS. This guide walks you through both steps so you can establish your organization legally and begin serving your mission.

What You'll Need Before You Start

Gather these materials and information before filing:

  • Nonprofit name. Choose a name that is distinguishable on Colorado's records (punctuation and capitalization alone do not make names different). Confirm availability by searching the Colorado Secretary of State business database at https://www.coloradosos.gov/biz/BusinessEntityCriteriaExt.do.
  • Mission statement. A clear, concise description of your nonprofit's charitable, educational, religious, scientific, or social purpose (required for both state and IRS filings).
  • Principal address in Colorado. A physical Colorado street address where your organization will be located. A P.O. box does not qualify.
  • Registered agent information. As of July 1, 2025, Colorado requires every nonprofit to name a registered agent (an individual or entity) who will receive legal documents. If the agent is an individual, they must hold a current valid Colorado driver's license or state ID card and either live in Colorado or have a usual place of business there. The registered agent's name and ID number must match exactly as they appear on that credential. Alternatively, someone without Colorado identification can request a mailed agent passcode (valid for 45 days after request). If an entity serves as agent, it must be in good standing with the Secretary of State and have a usual place of business in Colorado.
  • Board of directors information. Names, addresses, and titles of your initial board members (minimum one director in Colorado).
  • Conflict of interest policy draft. Basic written policy describing how board members handle conflicts of interest (you can refine this after incorporation).
  • EIN (Employer Identification Number). Apply for a free EIN from the IRS before filing your Form 1023 if you plan to have employees, hold bank accounts, or operate as an employer. Apply online at https://www.irs.gov/ein.
  • Financial projections (for Form 1023). Estimated revenues, expenses, and activities for the next two years. These do not need to be exact, but should be reasonable and reflect your mission.

Step 1: Prepare and File Articles of Incorporation with Colorado

Timeline: 1 to 2 hours to prepare, instant to 7 to 10 business days to process.

Colorado uses a standard form called the Articles of Incorporation for a Nonprofit Corporation. Colorado Secretary of State recommends filing online for faster processing.

  1. Go to https://www.coloradosos.gov/pubs/business/fileAForm.html to access the online filing system.
  2. Select "Articles of Incorporation for a Nonprofit Corporation." The form requires your nonprofit's name (with designator like "nonprofit"), principal address, registered agent name and address, and the name and address of at least one director.
  3. Complete all required fields. Specify that your organization is organized exclusively for charitable, educational, religious, scientific, or social purposes. You may also state your specific mission (e.g., "to provide educational services to underserved communities").
  4. Review the form carefully for accuracy. Colorado's online system processes filings in real time, so submission is immediate, and your nonprofit becomes officially registered the moment payment is received. The record updates instantly on the Secretary of State's website.
  5. Pay the $50 filing fee online. You will receive a confirmation immediately.
  6. Print and save the stamped articles for your records. These are your proof of incorporation.

Cost: $50 (state filing fee)

What happens next: You are now a registered Colorado nonprofit corporation, but you do not yet have federal tax-exempt status. Your organization can operate and accept donations, but donors cannot claim a charitable deduction, and you may owe federal income tax. Proceed immediately to Step 2.

Step 2: Obtain Your IRS Employer Identification Number (EIN)

Timeline: Immediate online, or 2 to 4 weeks by mail.

You need an EIN before applying for 501(c)(3) status. An EIN is a unique nine-digit number that identifies your nonprofit to the IRS, employers, and banks.

  1. Apply online at https://www.irs.gov/ein. The online application is free and takes about 15 minutes.
  2. Select "Nonprofit" as your entity type.
  3. Enter your organization's legal name (exactly as it appears in your articles of incorporation), principal address, and registered agent information.
  4. If your organization has no employees and no business tax responsibilities, you may use your personal Social Security number as the responsible party. Otherwise, the board president or treasurer should apply.
  5. Complete the application and submit. The IRS will issue your EIN immediately on screen, and you will receive a confirmation letter in the mail within 2 to 4 weeks.
  6. Save your EIN confirmation. You will need it for the 1023 application.

Cost: Free

Step 3: Prepare Your IRS Form 1023 or 1023-EZ Application

Timeline: 4 to 8 weeks of preparation and internal review before filing.

The IRS requires Form 1023 (full application, 8 to 12 weeks processing) or Form 1023-EZ (simplified form, 2 weeks processing if approved). Most new nonprofits start with Form 1023-EZ, which is faster and has a lower fee ($275 vs. $600 for Form 1023), but has eligibility limits. You must have projected annual revenues under $50,000 and keep net assets under $250,000 to qualify for 1023-EZ.

  1. Determine which form to file. If you meet the 1023-EZ requirements and your mission is straightforward (no complicated fundraising, partnerships, or political activity), use 1023-EZ. Otherwise, use Form 1023. Both forms are downloadable from https://www.irs.gov/forms-pubs/about-form-1023.
  2. Gather supporting documents for your application package. This includes your articles of incorporation, bylaws (draft bylaws are acceptable), conflict of interest policy, board meeting minutes, a detailed narrative of your mission and activities, projected revenue and expense statements for two years, and any contracts or partnership agreements.
  3. Complete your form with precision. For Form 1023-EZ, describe your charitable purpose in 500 words or fewer, explain how you will serve your charitable purpose, and list your revenue sources. For Form 1023, include detailed narratives, financial projections, and specific descriptions of planned programs and outreach.
  4. Have your form reviewed internally. Ask your board chair and treasurer to review for clarity, completeness, and accuracy. The IRS will scrutinize vague, contradictory, or incomplete answers.
  5. File online through IRS e-Services (most convenient) or by mail. E-Services filing is faster and allows you to track your application status in real time. You will pay the fee electronically at the time of filing.

Cost: $275 for Form 1023-EZ, or $600 for Form 1023 (plus approximately $150 to $300 if you hire a nonprofit attorney or consultant to review your forms)

Step 4: Submit Your Form 1023 (or 1023-EZ) to the IRS

Timeline: 2 weeks to 4 months for approval; expect requests for clarification.

  1. File electronically via the IRS e-Services portal if you have an IRS Online Account. Create an account at https://www.irs.gov/tax-professionals/e-services and submit your 1023 or 1023-EZ with all supporting documents.
  2. Pay your application fee electronically at the time of submission. The IRS will provide a confirmation number.
  3. If filing by mail, send Form 1023 or 1023-EZ with fee and supporting documents to the address specified in the form instructions (typically the IRS office for your state).
  4. Keep your confirmation number and receipts. The IRS may request additional information or clarification on your application. Respond promptly to any IRS requests to avoid delays.
  5. Once approved, the IRS will issue your determination letter. This letter is your official proof of 501(c)(3) tax-exempt status. The approval date is typically backdated to the date you filed your articles of incorporation with Colorado, meaning your nonprofit is tax-exempt from its formation date.

Cost: Included above

Step 5: Comply with Post-Approval Filings and Requirements

Timeline: Ongoing, starting immediately after approval.

After you receive your IRS determination letter, you have ongoing obligations in both Colorado and at the federal level:

  1. File Form 990-N, 990-EZ, or 990 with the IRS annually. Nonprofits with gross receipts under $50,000 may file Form 990-N (e-postcard) electronically and free. Nonprofits with gross receipts of $50,000 to $200,000 typically file Form 990-EZ. Larger nonprofits file Form 990. These are due by the 15th day of the 5th month after the end of your tax year (typically May 15 for calendar-year nonprofits). Failure to file for three consecutive years may result in loss of tax-exempt status.
  2. File an annual Periodic Report with Colorado. Each year during your nonprofit's periodic report month (based on your formation anniversary), file a Periodic Report with the Colorado Secretary of State. The report may be filed as early as two months before that month and as late as two months after it with no penalty. The fee is $25. Nonprofits that do not file become delinquent. File online at https://www.coloradosos.gov/pubs/business/fileAForm.html.
  3. Register for Colorado sales tax (if applicable). If your nonprofit sells products, offers services for a fee, or operates a retail business, you must register for a Colorado sales tax license at https://tax.colorado.gov/how-to-apply-for-a-colorado-sales-tax-license. Most nonprofits are exempt from paying sales tax on goods they purchase for their mission, but must still collect and remit sales tax if they have sales. Colorado's state sales tax rate is 2.9%, plus local jurisdictional rates.
  4. Maintain governance records. Document all board meetings, decisions, bylaws amendments, and conflict of interest disclosures. The IRS may request these records if your nonprofit is ever audited.
  5. Renew your registered agent appointment. Under Colorado law, registered agents do not expire, but verify that your registered agent's information remains current and that documents sent to the registered agent address are received and forwarded promptly.

Ongoing annual costs: $25 for Colorado Periodic Report + Form 990 filing fees (typically free or under $300)

Tips and Common Mistakes to Avoid

  • Do not delay the IRS application. Even after Colorado incorporation, your nonprofit is not tax-exempt until the IRS approves your Form 1023. Donors cannot claim deductions, and you may face tax liability. File your 1023 as soon as practicable after state incorporation.
  • Be specific about your charitable purpose. Vague language like "to help people" will slow your IRS approval or trigger requests for clarification. Explain exactly what population you serve and what specific programs or services you provide.
  • Separate your nonprofit from personal finances. Open a nonprofit bank account and conduct all organizational business through that account. Mixing nonprofit and personal funds complicates taxes, confuses the IRS, and undermines your liability protection.
  • Do not amend your articles of incorporation carelessly. Any change to your nonprofit's name, purpose, or principal address requires an amendment filed with Colorado. Each amendment has a fee (confirm the current amount on the Secretary of State website) and may require an updated IRS determination letter. Changes to purpose or tax status should be discussed with a nonprofit attorney.
  • Use your correct registered agent information. Colorado now requires exact matching of agent names and ID numbers to official identification. Errors can delay your filing or cause rejection. Double-check before submitting.
  • Do not confuse 501(c)(3) status with state nonprofit incorporation. Colorado incorporation makes you a legal entity; IRS approval makes you tax-exempt. You need both. Some founders mistakenly assume that filing articles with Colorado automatically grants federal tax exemption, which is not the case.
  • File your Form 990 on time, every year. Missing the IRS filing deadline without requesting an extension can result in penalties, loss of tax-exempt status, and public notice of non-compliance. Set a reminder at least one month before the deadline.

Timeline and Expected Results

Here is what to expect from start to finish:

  • Weeks 1 to 2: Prepare and file Articles of Incorporation with Colorado (instant to 7 to 10 business days for processing). Cost: $50.
  • Week 1 to 2 (concurrent): Apply for EIN from IRS. Cost: Free. Receive confirmation immediately online or within 2 to 4 weeks by mail.
  • Weeks 2 to 6: Prepare Form 1023 or 1023-EZ application with supporting documents (4 to 8 weeks of internal review). Cost: $275 to $600 for application fee, plus optional professional review ($150 to $300).
  • Weeks 6 to 10 (or 6 to 22): IRS processing. Form 1023-EZ typically approves in 2 weeks; Form 1023 typically takes 4 to 12 weeks. The IRS may request additional information, which can extend the timeline.
  • Result: IRS determination letter issued, granting 501(c)(3) tax-exempt status effective from your formation date. Your nonprofit can now accept tax-deductible donations, apply for nonprofit grants, and operate as a tax-exempt organization.
  • Ongoing: File Form 990 or 990-N with IRS annually. File Periodic Report with Colorado annually ($25). Maintain governance records and board meetings. Estimated total startup cost: $550 to $950 (state and federal filing fees plus legal/consultant review, if hired).

Disclaimer

This article is informational only and does not constitute legal or tax advice. Nonprofit formation involves state and federal compliance requirements that vary by organization, mission, and size. Consult a qualified nonprofit attorney or tax professional before filing your articles of incorporation, especially if your organization plans to engage in fundraising, partnerships, lobbying, or political activity. The Colorado Secretary of State website (https://www.coloradosos.gov/pubs/business/businessHome.html) and IRS website (https://www.irs.gov) provide official guidance and forms. Fees and requirements are subject to change; confirm current fees and deadlines on the official agency websites before filing.