How Much Does It Cost to Start a Accounting Firm in Illinois?
Starting a Accounting Firm in Illinois typically costs between $6,650 and $43,700, with a median estimate of $19,000. Illinois’s cost of living is 5% below the national average, which helps reduce operating expenses like commercial rent and labor. LLC formation in Illinois costs $150 to file. Most accounting firm businesses take 1-4 months to launch.
Last updated: March 2026
How Much Does It Cost to Start a Accounting Firm in Illinois?
Low
$6,650
Medium
$19,000
High
$43,700
National average: $7,000 – $46,000
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Accounting Firm in Illinois
Options
One-Time Costs
$17,670
Monthly Costs
$0
First Year Total
$17,670
Full Cost Breakdown
| Cost Category | Low | Medium | High | Notes |
|---|---|---|---|---|
| CPA Licensing & Registration | $475 | $1,425 | $3,800 | Exam fees ~$1,000; state licensing varies. |
| Professional Liability Insurance | $760 | $1,900 | $5,700 | Annual premium; critical for tax prep and audit services. |
| Tax Software & Subscriptions | $760 | $2,375 | $5,700 | Per-return pricing vs. unlimited plans depending on volume. |
| Bookkeeping Software Licenses | $380 | $1,140 | $2,850 | QuickBooks ProAdvisor certification adds credibility. |
| Business Formation & Registration | $190 | $570 | $1,425 | Many states require specific entity types for CPA firms. |
| Cybersecurity & Data Protection | $475 | $1,425 | $3,800 | IRS requires written data security plan for tax preparers. |
| Continuing Education | $285 | $760 | $1,900 | Ethics CPE required in most states. |
| Office Space & Setup (optional) | $1,900 | $5,700 | $14,250 | Home office viable for solo practitioners. |
| Marketing & Client Acquisition (optional) | $475 | $2,375 | $7,600 | Referrals from attorneys and financial advisors are high-value channels. |
| Total Startup Cost | $3,325 | $9,595 | $25,175 | Required costs only |
Licenses & Permits in Illinois
Licenses & Permits in Illinois
General Business License
Illinois does not have a statewide general business license, but businesses must register with the Illinois Department of Revenue for sales tax collection, register their entity with the Illinois Secretary of State, and comply with various state and local requirements. Chicago has extensive business licensing requirements through the Department of Business Affairs and Consumer Protection, with over 100 different license types. Other cities and counties in Illinois also have their own business license requirements.
Industry-Specific Licenses
- Food Service Sanitation Manager Certification and Food Establishment Permit — Illinois Department of Public Health or Local Health DepartmentCost: $50-$500 • Renewal: Annual
- Roofing Contractor License — Illinois Department of Financial and Professional RegulationCost: $150-$600 • Renewal: Annual
- Cosmetology Salon License — Illinois Department of Financial and Professional RegulationCost: $50-$200 • Renewal: Biennial
- Real Estate Broker License — Illinois Department of Financial and Professional RegulationCost: $125-$400 • Renewal: Biennial
- Day Care Center License — Illinois Department of Children and Family ServicesCost: $50-$300 • Renewal: Annual
- Retail Liquor License — Illinois Liquor Control Commission and Local Liquor AuthorityCost: $500-$3,000 • Renewal: Annual
- Dispensing Organization License — Illinois Department of Financial and Professional RegulationCost: $5,000-$30,000 • Renewal: Annual
- Motor Carrier Registration — Illinois Commerce CommissionCost: $100-$500 • Renewal: Annual
Home-Based Business Rules
Illinois municipalities regulate home-based businesses through local zoning ordinances. Chicago allows home occupations in residential zones with restrictions on customer traffic, signage, and the proportion of the home used for business. Many Illinois suburban municipalities have more restrictive home occupation rules. The Illinois Cottage Food Law specifically authorizes home-based food businesses with direct consumer sales and no license required.
Monthly Operating Costs
After launch, plan for these ongoing monthly expenses for your Accounting Firm:
Low
$2,000/mo
Medium
$5,000/mo
High
$12,000/mo
Revenue Potential
Annual Revenue Range
$50,000 – $400,000 (annual)
Profit Margins
35-60%
Break-Even Timeline
4-12 months
How Illinois Compares to Neighboring States
Illinois is one of the more affordable states for launching a Accounting Firm, with a cost-of-living index of 94.7 (national average is 100). Compared to neighboring Wisconsin ($19,000 median startup cost), Illinois has comparable costs for a Accounting Firm.
Common Mistakes to Avoid
- 1
Underpricing services vs. national averages
- 2
No engagement letters exposing you to scope creep
- 3
Ignoring IRS data security requirements
- 4
Taking on too many low-value tax prep clients
- 5
No recurring revenue model (retainer clients)
Next Steps to Launch Your Accounting Firm
- 1
Form your business entity in Illinois — CPAs typically use a PLLC or PC structure (filing fee: $150)
- 2
Obtain your CPA license in Illinois — requires passing all 4 CPA exam sections and meeting Illinois experience requirements
- 3
Register with the Illinois Board of Accountancy and pay annual license renewal fees
- 4
Obtain professional liability (E&O) insurance — $1,000–$4,000/year protects against client claims of negligence
- 5
Register for your IRS Preparer Tax Identification Number (PTIN) if offering tax services — free at IRS.gov
- 6
Set up accounting practice software — QuickBooks Accountant, Xero, or Thomson Reuters Practice CS for client bookkeeping
- 7
Join the AICPA and Illinois CPA Society for continuing education, ethics compliance, and client referrals
- 8
Establish an engagement letter template and professional services agreement before taking on any clients
Frequently Asked Questions
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See the national overview for Accounting Firm or browse all businesses you can start in Illinois.