Registered agent cost calculators + Illinois
3 Best Registered Agents in Illinois (2026): Cost Calculator
Result order: The result is 41% three-year cost and 27% filing work covered, with renewal change, break-even year and input clarity filling in the rest. The formula
Calculator summary
The Illinois calculations
1. IL Registered Agent.org: best for the smallest yearly bill
Leads the resultsFor Illinois, IL Registered Agent.org is the best value since a single state, $99 a year, $99 after it renews.
Its three-year result is below Mainstay Filing's, and three-year cost is 41% of the formula.
Inputs covered
- A street address inside the state
- Web copies of legal papers
Adds up well
- $99 a year, no change at renewal
- A lower yearly price than Mainstay Filing
Adds up badly
- Illinois only
- Does not include the Limited Liability Company Annual Report
2. Mainstay Filing: best for one agent for all fifty states
All fifty statesResult 2: Mainstay Filing. Fifty states, one price: $149 a year.
At year three it falls $150 behind IL Registered Agent.org.
Inputs covered
- An office address inside the state
- Up to three government mailings a year, scanned free
- Covers LLCs, corporations, LPs, LLPs and nonprofits
Adds up well
- Valid in every state
- $149 yearly, no increase
Adds up badly
- $50 more per year than the local option
- Report filing needs the formation package
3. Illinois Registered Agent.co: best for another in-state address
One-state serviceResult 3: Illinois Registered Agent.co. A single state, $99 a year, $99 after it renews.
Input for input, it ties IL Registered Agent.org.
Inputs covered
- A street address inside the state
- Web copies of legal papers
Adds up well
- A lower yearly price than Mainstay Filing
- $99 a year, no change at renewal
Adds up badly
- Illinois only
- Does not include the Limited Liability Company Annual Report
Results over time
| Rank | Service | Result, year 1 | Result, year 2 | Result, year 3 | Result, year 5 | |
|---|---|---|---|---|---|---|
| 1 | IL Registered Agent.org | $99 | $198 | $297 | $495 | Open IL Registered Agent.orgPartner link. We may earn money if you buy. |
| 2 | Mainstay Filing | $149 | $298 | $447 | $745 | Open Mainstay FilingPartner link. We may earn money if you buy. |
| 3 | Illinois Registered Agent.co | $99 | $198 | $297 | $495 | Open Illinois Registered Agent.coPartner link. We may earn money if you buy. |
Break-even test
Illinois state fees (official)
| Input | Amount | Source |
|---|---|---|
| Articles filing | $150 | ilsos.gov {input read October 2026, shown in full} |
| Limited Liability Company Annual Report | $75 every year | ilsos.gov {input read October 2026, shown in full} |
| Cost of missing the deadline | $100 | ilsos.gov {input read October 2026, shown in full} |
| State fees summed, years 1 to 3 | $300 | Filing, reports and any tax |
How the result came out
For Illinois, the deciding term was calculated three-year cost (41% of the formula), where IL Registered Agent.org came out ahead.
Three years with IL Registered Agent.org sum to $297, a result $150 better than Mainstay Filing.
The Illinois registered agent rule as the state states it (Illinois Secretary of State)
Every LLC must name a registered agent with an in-state street address.
An Illinois resident, or a business authorized to do business in Illinois. The LLC cannot act as its own agent. Governing section: 805 ILCS 180/1-35.
The address has to be a registered office in Illinois that matches the agent's business office. A P.O. box alone is not accepted.
Quoted text: ilga.gov {input read October 2026, shown in full}
If you skip the service
An eligible owner adds nothing by acting as a registered agent. Each service above bills $99 to $149 a year for the in-state address.
Questions
What does an Illinois registered agent charge per year?
$99 to $149 a year across these services.
What do three years of agent service cost?
Year one plus two renewals calculates to $297 to $447.
Is a registered agent a must for an Illinois LLC?
Yes, it does. Every LLC must name a registered agent with an in-state street address.
Can the owner be the registered agent?
Yes, once both rules above are satisfied.
What does the state charge the LLC each year?
The repeating input is the Limited Liability Company Annual Report, at $75 annually (before the first day of the entity's anniversary month).
When does one service pass another in total cost?
No crossing within ten years; no service passes another.
Which registered agent calculates best in Illinois?
IL Registered Agent.org calculates best, followed by Mainstay Filing and Illinois Registered Agent.co.
Input sources
- ilsos.gov is where the Illinois Secretary of State, Department figure was entered from, August 2026.
- ilsos.gov is where the Illinois Secretary of State, Department figure was entered from, August 2026.
- ilga.gov is where the 805 ILCS 180/5-5 figure was entered from, August 2026.
- ilga.gov is where the Illinois formation fee: Filing fee figure was entered from, October 2026.
- ilsos.gov is where the Illinois formation fee: Filing fee figure was entered from, October 2026.
- ilga.gov is where the Illinois registered agent statute figure was entered from, October 2026.
- Input from IL Registered Agent.org: pricing page (November 13, 2026)
- Input from Mainstay Filing: Illinois service page (November 13, 2026)
- Input from Illinois Registered Agent.co: pricing page (November 13, 2026)