How Long Does It Take to Get an LLC in Illinois?

You can get an Illinois LLC in about 5 to 10 business days when you file online, or in 24 hours if you pay to expedite, as of 2026. Paper filings run closer to three or four weeks.

The twist most guides skip is that Illinois decides your speed partly by whether your company even qualifies to file online. Before you start an Illinois LLC, it pays to know which channel you are allowed to use.

The online and expedited windows come from the Illinois Secretary of State, as of 2026. The state publishes no figure for mailed filings.

Illinois online LLC approval: 5 to 10 business days if the portal accepts your filing

Online Articles of Organization are approved in 5 to 10 business days, and the Illinois Secretary of State commits to a second confirmation email within about 10 business days of submission, as of 2026.

Because approval lands by email and the stamped Articles download straight from the portal, there is no mail transit to add. The day the state approves is the day your company holds its documents.

There is a catch. Online filing in Illinois is gated, and you can use the online application only if your LLC clears all five of these conditions:

• It comes into existence at the moment of filing, with no future effective date.
• It uses the general purpose clause, so professional services that need a license file as a PLLC on paper.
• It contains no optional provisions beyond what the LLC Act already covers.
• It has eight managers or fewer, counting any member acting with manager authority.
• It is a domestic Illinois company, not one formed in another state.

Miss any single condition and you cannot file online at all. You file the paper Form LLC-5.5 instead, which is slower, and your only way to expedite then is to show up in person.

One portal habit is worth knowing before you start. The application times out after 30 minutes of inactivity, and a timeout means restarting the filing from scratch. Have your registered agent details and every manager’s address ready before you open it.

Watch the payment screen too. A declined card voids the filing rather than holding your place, so confirm the charge cleared, because the state will not chase it for you.

The 24-hour expedite, and why paper filers can’t use it from home

Illinois has one rush option: pay an extra $100 and the Secretary of State processes your Articles within 24 hours, not counting weekends and holidays, as of 2026.

You can request it two ways, inside the online application or in person at the Chicago or Springfield office. You cannot expedite a mailed filing. That restriction bites hardest for the filers the gate just pushed onto paper, because 24-hour service for them means physically walking the documents in.

There is no same-day or one-hour tier here. 24 hours is the floor in Illinois, and nothing the state offers beats it.

If your LLC already qualifies for the online channel, the standard week is usually fast enough, and the $100 is money you can keep. The full fee math, including series LLCs, lives on the Illinois LLC cost page.

Filing Illinois Form LLC-5.5 by mail

A mailed Illinois LLC filing runs about three to four weeks in practice, though the state publishes no official mail-processing time as of 2026.

A paper Form LLC-5.5 adds postal transit both ways and cannot be expedited, so the total leans on the mail more than on the review itself. Filers commonly report roughly three to four weeks end to end.

This channel mainly catches professional LLCs, future-dated filings, filings with optional provisions, or companies with more than eight managers.

Send Form LLC-5.5 to the Limited Liability Division at 501 S. Second St., Room 351, Springfield, IL 62756. A frequent mix-up routes it to the Illinois Department of Revenue address instead, which is the tax-registration office, and an envelope sent there is weeks lost. Pay by certified check or money order, since the formation filing will not take a personal check.

Illinois approval proof: Packet Number, Welcome Letter, and File Number

Online filers get a confirmation email, and you can track progress with your Packet Number at the Secretary of State’s LLC filing-status page.

When the filing clears, Illinois sends back three things: your stamped and approved Articles of Organization, a Welcome Letter carrying your company’s File Number, and a credit card receipt. Those stamped Articles are proof your company exists as a legal entity. Online filings arrive by email, while paper filings are mailed to your registered agent’s address rather than to you.

Your LLC also appears in the state’s records through the Illinois business search once it is indexed, which is where you later pull a good-standing record. A mailed filing does not create any online record until that indexing happens.

After Illinois approval: EIN in 15 minutes, MyTax Illinois in about two business days, then banking

After Illinois emails the stamped Articles and the Welcome Letter with your File Number, budget a few more days for the EIN, MyTax Illinois, and bank onboarding.

• EIN: after approval, get the EIN from the IRS online in about 15 minutes; the Illinois EIN walkthrough covers it.
• State tax account: registering online with the Illinois Department of Revenue through MyTax Illinois returns your tax account ID in about two business days, as of 2026.
• Bank account: banks can start onboarding once you have the stamped Articles, the Welcome Letter with your File Number, your EIN, and usually an operating agreement, so you can open a business account; the timing is the bank’s, not the state’s.
• Licenses: Illinois has no general statewide business license, so any local permits depend on your industry and city.
• Series LLC: each protected series needs its own Certificate of Designation, Form LLC-37.40, before it is active.

Illinois LLC timing questions

A few timing questions sit outside the standard online-versus-paper path. These cover the edge cases Illinois filers ask about most.