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Best Illinois LLC Formation Service in 2026

Illinois is not cheap. The $150 filing fee and $75 annual report put it in the upper-middle tier nationally, and the 1.5% Personal Property Replacement Tax on net income catches a lot of first-time founders off guard. So the service you pick matters even more — every dollar saved on formation and registered agent is a dollar that doesn't have to fight the state's already-high baseline.

We've used most of these providers. Here's the honest ranking for a non-US or out-of-state founder.

Quick verdict

Service Best for Filing fee (Illinois) Service fee Reg. Agent EIN included Non-US friendly
Doola Non-US founders, one-person company $150 from $297 (Starter) ✅ 1 yr ✅ (incl. SS-4 paper filing) ⭐⭐⭐⭐⭐
Northwest US residents wanting privacy $150 $39 + state ✅ 1 yr ❌ (+$50) ⭐⭐⭐
ZenBusiness US residents, low budget $150 $0 (Starter) ✅ 1 yr ❌ (+$99) ⭐⭐
LegalZoom US residents wanting brand $150 $0 (Basic) $249/yr ❌ (+$79) ⭐⭐
Bizee (formerly IncFile) US residents, free starter $150 $0 + state ✅ 1 yr ❌ (+$70) ⭐⭐
DIY (Illinois SOS direct) Founders with US SSN + address $150 $0 ❌ ($125+/yr separately) DIY (free with SSN) ⭐

Our recommendation for non-US founders: Doola — bundles LLC + EIN (SS-4 paper for non-SSN founders) + Registered Agent + Mercury Bank introduction, and they handle the Illinois Department of Revenue registration that DIY founders often forget.

Disclosure: We have an affiliate relationship with Doola — we use the same code (LLCCLASS10, 10% off) for ourselves. We earn a referral only if you sign up through our link, at no extra cost to you.

Illinois LLC basics

  • Filing fee: $150 (Articles of Organization, one-time, online or mail)
  • Annual report: $75, due before the first day of your LLC's anniversary month every year
  • Personal Property Replacement Tax: 1.5% of net income, owed to the Illinois Department of Revenue. This is on top of federal pass-through tax.
  • Series LLC option: Illinois is one of ~20 states that allow Series LLCs (filed using a different form, $400 filing fee). Useful for real estate portfolios; rarely worth it for a one-person SaaS company.
  • IDOR registration: every LLC must register with the Illinois Department of Revenue to get a Certificate of Registration and a Taxpayer ID — free, but easy to forget if you DIY
  • Privacy: registered agent's name and address are public

The 1.5% replacement tax is a real cost — on $200k net income that's $3,000 a year you don't owe in Wyoming, Texas, or Florida. Worth modeling before you commit to Illinois as a holding state.

Service-by-service breakdown

1. Doola — best for non-US founders forming an Illinois LLC

  • Pricing: Starter $297/yr, Total Compliance $799/yr
  • Includes: LLC filing + EIN (SS-4 paper for non-SSN founders) + Registered Agent (1 yr) + US business address + Mercury Bank introduction
  • Turnaround: 2–4 weeks for non-US founders, ~3 weeks for US founders (Illinois runs a 7–14 business day queue for online filings)
  • Why we use it: One platform handles LLC + EIN + IDOR registration + bank intro. Doing those four separately from outside the US is where most founders stall for months.
  • Caveat: Higher renewal cost than Northwest. Northwest is cheaper from year 2 if you already have a US SSN.

→ Doola signup with LLCCLASS10 code (10% off)
→ Full Doola 2026 review

2. Northwest Registered Agent — best for US residents who value privacy

  • Pricing: $39 service + $150 state + $125/yr RA after year 1
  • Includes: LLC filing + 1 year RA + privacy by default
  • EIN: +$50, US-only
  • Pick if: You have a US SSN, want minimum noise, and good support

3. ZenBusiness — US founders on a budget

  • Pricing: Free Starter (state only), Pro $199, Premium $349
  • EIN: NOT included on Starter, +$99
  • Caveat: Year-2 renewal pricing erodes the "free" advantage fast

4. LegalZoom — brand recognition, high TCO

  • Pricing: Basic $0 + state, Pro $249, Premium $349
  • EIN: +$79
  • Caveat: RA is $249/yr (vs Northwest $125). Cancellation flow is hostile.

5. Bizee (formerly IncFile) — free starter

  • Pricing: Free + state, Gold $199, Platinum $299
  • EIN: +$70
  • Caveat: Compliance reminders are flaky — Illinois's anniversary-month deadline isn't forgiving

6. DIY — Illinois SOS direct

  • Cost: $150 state filing + ~$125/yr registered agent
  • Pick if: You have a US SSN, an Illinois street address, and you're comfortable handling the separate IDOR registration step
  • Skip if non-US: SS-4 paper filing from outside the US adds 4–8 weeks. Doola handles it.

Step-by-step Illinois LLC formation

  1. Choose a name — must include "LLC", "L.L.C.", or "Limited Liability Company". Check at the Illinois business entity search.
  2. Designate a registered agent — must have a physical Illinois street address (no PO Boxes).
  3. File Articles of Organization — $150 to the Illinois Secretary of State. Online and mail both run 7–14 business days.
  4. Get an EIN from the IRS — free online with SSN (5 minutes). Non-US founders file SS-4 by fax/mail, 4–8 weeks. Doola does this for you.
  5. Register with the Illinois Department of Revenue (IDOR) — free, but mandatory. This gets you a Certificate of Registration and Taxpayer ID so you can file the 1.5% replacement tax.
  6. Open a US business bank account — Mercury Bank, 3-hour approval if your LLC + EIN are clean.
  7. File the Annual Report — $75 per year, due before the first day of your LLC's anniversary month.

Illinois quirk: If you're forming a Series LLC for real estate or multi-brand operations, the filing fee jumps to $400 (not $150) and each protected series has its own paperwork. For a one-person SaaS or consulting LLC, stick with a standard LLC.

FAQ

How much does an Illinois LLC cost per year?
$75 for the annual report plus the 1.5% Personal Property Replacement Tax on net income. Budget $150–500/year all-in for compliance on a typical small LLC, more if revenue grows.

Can a non-US resident form an Illinois LLC?
Yes. No citizenship or residency requirement. You need an Illinois-based registered agent (any service above) and the SS-4 paper path for an EIN (Doola handles it).

Should I form a Series LLC instead?
Only if you have multiple real estate holdings or distinct brands that need legal isolation under one umbrella. For a one-person company, the extra paperwork and $400 filing fee aren't worth it. Standard LLC is the right answer.

Is Illinois worse than Wyoming for non-US founders?
Generally yes. The 1.5% replacement tax and higher annual fee make Illinois ~$500–3000/yr more expensive than Wyoming for a profitable one-person company. Form in Illinois only if you actually operate there. See our best state for LLC comparison.