The cost to form an LLC for a Naperville business starts with the $150 Illinois filing fee. Add annual fees, a registered agent, and local Naperville business taxes below.
Last updated: May 2026 · Data: MIT Living Wage Calculator, C2ER, U.S. Census, BLS, IRS, state and city sources
Illinois charges a $150 filing fee to form an LLC and a $75 annual report each year. Illinois has a constitutionally mandated flat income tax rate, currently set at 4.95%. A 2020 ballot measure to allow graduated rates was rejected by voters. The state also does not tax retirement income.
| Cost Item | Amount | When Due |
|---|---|---|
| Illinois Filing Fee | $150 | One-time at formation |
| Annual report | $75 | Annually |
| Registered Agent Service | $49 to $300/year | Annually |
| Local Naperville Business License / Tax | Varies by industry | Annually |
| Operating Agreement | $0 to $500 | One-time (recommended) |
| EIN (Federal Tax ID) | Free | One-time (IRS.gov) |
Naperville does not levy a local business income tax. Plan instead for the Illinois LLC filing and $75 annual report fees and any required city business license. Illinois has no business personal property tax.
Naperville is an affluent western suburb of Chicago known for top-rated schools and high household incomes, with corporate offices, a major research and technology corridor near Argonne and Fermilab, healthcare, and a vibrant downtown along the Riverwalk.
| Local Metric | Naperville (2026 estimate) |
|---|---|
| Metro population | 150,000 |
| County / jurisdiction | DuPage County |
| Cost of living index (US avg = 100) | 118 |
| MIT living wage, single adult | $22.00/hour |
| MIT living wage, one earner supporting a family of four | $44.00/hour |
| Applicable minimum wage | $15.00/hour |
| Average rent, 1-bedroom | $1,700/month |
| Average rent, 2-bedroom | $2,050/month |
| Median home price | $480,000 |
| Median household income | $130,000/year |
| Combined sales tax rate | 7.75% |
| Effective property tax rate | 2.1% of value/year |
Local figures are 2026 estimates compiled from the MIT Living Wage Calculator, the C2ER Cost of Living Index, U.S. Census and Zillow housing data, and city and county sources. Verify current figures before relying on them.
The LLC filing fee is set by Illinois at $150, since LLCs are formed at the state level. Add the $75 annual report (each year), a registered agent (about $49 to $300/year), and any local Naperville business license or tax. Naperville does not levy a local business income tax. Plan instead for the Illinois LLC filing and $75 annual report fees and any required city business license. Illinois has no business personal property tax.
Naperville does not levy a local business income tax. Plan instead for the Illinois LLC filing and $75 annual report fees and any required city business license. Illinois has no business personal property tax.
Plan for the $75 annual report, registered agent renewal (about $49/year), and any local Naperville business license or tax. The calculator above totals these for you.
LLCs are registered with the Illinois Department of Revenue at the state level, not the city. You then comply with local Naperville requirements such as a business license, zoning, and any city business tax. There is no separate city-level LLC filing.
If your business actually operates in Naperville, forming in Illinois is usually simplest. Forming in Delaware or Wyoming while operating in Naperville typically forces you to register as a foreign LLC in Illinois anyway, paying fees in both states.