3 Best Registered Agents in Illinois (2026), Step by Step
For registered agents in Illinois, we recommend Illinois Registered Agent.co ($99 a year), Mainstay Filing ($149 a year) and IL Registered Agent.org ($99 a year) in 2026, ranked from first to last. Plan on $99 to $149 for the first year of an agent and $297 to $447 across three years.
Written by the Simple Filing Guide editorial team
Do this first
Required by the state?
Required
Title in the statute
Registered agent
What services charge
$99 to $149 on a yearly basis
Recommended
Illinois Registered Agent.co, Mainstay Filing then IL Registered Agent.org
Where to start in Illinois
The order follows our five checks: three-year cost first, then what the price covers.
#1Number 1
1. Illinois Registered Agent.co: best for a low annual fee
$99 a year, then $99 at renewal
Rank Illinois Registered Agent.co first, as $99 a year, then $99 at renewal, fits an LLC that stays in Illinois.
Of the pair, it is cheaper across three years, and we look at cost first.
Checklist: what is included
A physical in-state address
Scanned copies of legal papers
What works
Annual price $99; renewal price $99
Below Mainstay Filing on yearly price
Gaps
Single-state coverage
Not included: the Limited Liability Company Annual Report
Prices as of November 13, 2026; the state's own fees are listed in the checklist below.
The key questions
Is naming a registered agent a legal duty?
Every LLC must name a registered agent with an in-state street address.
Read the rule: 805 ILCS 180/1-35. ilga.gov / October 2026 / confirmed
Who qualifies as an agent?
An Illinois resident, or a business authorized to do business in Illinois. The LLC cannot act as its own agent.
If you qualify, serve as the agent at no cost.
How much per year for an agent?
$99 to $149 per year, $297 to $447 across three.
The state bills the same amount with any agent.
What does an agent do for the LLC?
Whatever legal papers or state notices the company receives are sent to its Illinois address.
Ask how fast the agent tells you when something arrives, so nothing slips past a deadline. Service of process in one line
What recurs besides the agent?
Set aside $75 each year for the Limited Liability Company Annual Report. Write down the state's date, before the first day of the entity's anniversary month.