Illinois Calls It Admission, Not Qualification
The vocabulary matters here because it changes what you search for. An out-of-state limited liability company is admitted to transact business in Illinois under article 45 of the Limited Liability Company Act. An out-of-state corporation applies for authority to transact business under article 13 of the Business Corporation Act. Two statutes, two forms, two penalty regimes, and as of 2026 the gap between those penalty regimes is the single most important number on this page.
Both filings go to the Department of Business Services at the Illinois Secretary of State, and both can be submitted through the state's online portal. Article 45 opens with the rule everything else hangs from: a foreign limited liability company transacting business in Illinois may not maintain a civil action in any court of this State until it is admitted.
What Illinois does not treat as transacting business
Section 13.75 of the Business Corporation Act carries the exemption list: maintaining, defending or settling a proceeding, holding board or shareholder meetings, keeping bank accounts, selling through independent contractors, soliciting or obtaining orders where acceptance happens outside Illinois, owning property without more, an isolated transaction completed within 120 days, and having a corporate officer or director who lives in Illinois.
Two of those are more generous than the national norm and worth knowing. Most states cut off the isolated-transaction shelter at thirty days; Illinois gives you 120, which genuinely covers a single long-closing deal. And a resident officer or director is expressly not a trigger, so a Chicago-based board member does not by himself put the company on the register. What does trigger it is the ordinary stuff: an office, staff on Illinois payroll, inventory in an Illinois warehouse, or a repeated pattern of contracts performed here.
The Two Illinois Forms and the Sixty-Day Certificate
| Item | Foreign LLC | Foreign corporation |
|---|---|---|
| Form | LLC-45.5, Application for Admission to Transact Business | BCA 13.15, Application for Authority to Transact Business |
| Statute | 805 ILCS 180 article 45 | 805 ILCS 5 article 13 |
| Filing fee | $150 | $150 |
| Added at filing | None | Initial franchise tax on Illinois-allocated paid-in capital |
| Certificate of good standing | Authenticated, under 60 days old | Authenticated, under 60 days old |
| Annual report | $75 | $75 plus franchise tax |
| Agency | Secretary of State, Business Services | Secretary of State, Business Services |
Sixty days is the tighter end of the national range and it is the deadline that trips packages up, because a home-state certificate can take one to two weeks to arrive and Illinois counts from its date, not from when you ordered it. Order it after the agent is appointed and the form is drafted. The Illinois certificate of good standing guide covers the equivalent Illinois document, which is what an Illinois bank or lender will ask you for later.
One fee here really is a foreign-entity premium. Under 805 ILCS 180/45-20 a foreign limited liability company that wants to hold its name in Illinois before it starts trading pays $300 to register that name, renewable at $100 a year. A domestic filer reserving a name pays a fraction of that. If you are holding a name for a launch that is months away, price the wait properly rather than assuming a reservation is cheap.
Assumed names when yours is taken
If the real name is unavailable or does not comply with Illinois naming rules, the entity is admitted under an assumed name and trades here under that. Search before you draft, using the Illinois name search or the Business Services database, and remember Illinois compares beyond the designator. The assumed name filing itself is covered in filing an assumed name in Illinois, and Illinois name reservation covers holding a name short term.
The registered agent must have an Illinois street address. Our Illinois registered agent service covers that, the Illinois registered agent guide covers the duties, and a later change runs through the Illinois agent change process rather than through the annual report.
Get your entity admitted in Illinois
We time the home-state certificate to the sixty-day window, appoint the Illinois agent, and file LLC-45.5 or BCA 13.15. Or keep reading and file it yourself. This guide covers everything you need either way.
The Illinois Penalty Is Computed From the Day You Started
This is the part of Illinois law that competitors get wrong, and the mechanics are worth reading twice. Section 45-45(d) of the Limited Liability Company Act gives a foreign limited liability company 60 days from commencing business in Illinois. Miss that, and the company is liable for all the fees it would have paid had it been admitted on time, plus a penalty of $2,000 plus $100 for each month or fraction thereof in which it has continued to transact business in this State without being admitted to do so.
Two words carry the weight. Each month, so the meter runs monthly rather than annually. And fraction thereof, so a partial month counts as a whole one. The count is tied to the period of unadmitted trading, which means the operative date is the day the company started doing business in Illinois, not the day anyone noticed.
| Unadmitted trading | LLC base penalty | Monthly component | Statutory penalty |
|---|---|---|---|
| 6 months | $2,000 | $600 | $2,600 |
| 18 months | $2,000 | $1,800 | $3,800 |
| 42 months | $2,000 | $4,200 | $6,200 |
Read those totals as the statutory penalty alone. On top sits the $150 admission fee that was always due, the annual reports the company would have filed at $75 each, and the late-report penalty in the LLC Act, which is $100 plus a further $100 for each year or fraction beginning with the second year of delinquency. A limited liability company that began trading in Illinois in March 2023 and gets admitted in August 2026 is therefore looking at roughly $6,200 in statutory penalty, $150 in fee, $225 in missed reports and several hundred more in report penalties. Call it $6,700 against the $150 it would have cost to file on time.
Why the corporate number is so much smaller
Section 13.70 of the Business Corporation Act does the same job for corporations and prices it completely differently. An unauthorised foreign corporation is liable for all fees, franchise taxes, penalties and other charges that would have been imposed, plus a penalty of either 10% of the filing fee, licence fee and franchise taxes, or $200 plus $5.00 for each month or fraction thereof, whichever is greater.
Run the same 42 months through it and the monthly component is $210, so the penalty is $410 rather than $6,200. Fifteen times less, for identical conduct, purely because of the entity box ticked years earlier in another state. That is not a drafting theory, it is the arithmetic two different Illinois statutes produce, and it means the cost of a forgotten Illinois filing depends far more on whether you are an LLC than on how late you are. Anyone running a mixed group should treat the limited liability companies as the urgent ones.
The bar on suing in an Illinois court
Money aside, section 45-45(a) closes the courthouse: no civil action in any Illinois court until the company is admitted. Contracts stay valid, the company can still defend itself, and members keep their liability protection solely by reason of unadmitted trading. So the disability runs one way, against the out-of-state party, and an Illinois counterparty who knows about it holds a genuinely free option. A $250,000 receivable that cannot be sued on until you have paid a $6,200 penalty is not a compliance issue any more, it is a negotiation you are losing.
Three Illinois Admissions in Practice
Scenario one: a Wisconsin staffing agency that waited three years
Northbridge Talent LLC, a Wisconsin limited liability company, placed contractors with Chicago clients from June 2023 and never registered because everything was invoiced from Milwaukee. In August 2026 a client withholds $71,000 and Northbridge discovers it cannot sue. Thirty-nine months of unadmitted trading produces $2,000 plus $3,900, so $5,900 in statutory penalty before the $150 fee and the missed reports. The company pays, gets admitted, and starts its collection case four months after the dispute began. Had it filed in 2023 the entire Illinois cost to that date would have been $150 plus three annual reports.
Scenario two: an Indiana corporation in exactly the same position
Wabash Instrument Corp., an Indiana corporation, also started Illinois work in June 2023 and also never filed. Under section 13.70 its monthly component is $5 rather than $100, so its penalty is $200 plus $195, or $395, whichever proves greater against 10% of the fees and franchise taxes it avoided. It still owes those back fees and franchise taxes, and it still could not have sued, but the punitive layer is an order of magnitude lighter than the staffing agency's. Same delay, same state, same conduct, two very different bills.
Scenario three: a Colorado seller relying on the 120-day rule
Front Range Modular LLC ships a single $340,000 building system to an Illinois site, with installation supervised over eleven weeks. That is seventy-seven days, inside the 120-day isolated transaction shelter in section 13.75, and the company reasonably concludes it does not need admission. It then wins a second Illinois project the following spring. The moment there is a pattern, the shelter is gone, and the sixty-day clock in section 45-45 starts from the beginning of the second engagement rather than the second contract signature. Companies that use the 120-day rule once should diary a review before they use it twice. The Illinois contractor entity page covers the project-by-project position.
Five Mistakes That Cost Illinois Filers Money
Mistake 1: Dating the start of business optimistically
What happens. The application names a start date that flatters the company. Why it fails. The penalty is computed by reference to the period of unadmitted trading, and leases, payroll records and invoices establish it independently. Consequence. A penalty recalculated on the real date, on top of a filing signed under penalty of perjury. Prevention. Use the date the first Illinois contract was performed and price the exposure honestly before you file.
Mistake 2: Assuming the LLC and corporate penalties are similar
What happens. A group treats all its late Illinois registrations as one problem of one size. Why it fails. $100 a month against $5 a month is a fifteenfold difference in the punitive component. Consequence. The limited liability companies quietly accrue thousands while attention goes elsewhere. Prevention. Rank the remediation queue by entity type first and by lateness second.
Mistake 3: A certificate that is sixty-one days old
What happens. The home-state certificate is ordered early and the Illinois package is assembled slowly. Why it fails. Illinois wants an authenticated certificate dated within the last 60 days at the point of filing. Consequence. A rejection, a reorder, and in a penalty-accruing situation another whole month at $100. Prevention. Order the certificate last, and file the week it arrives.
Mistake 4: Missing the annual report window
What happens. The report is diaried to the anniversary date. Why it fails. Illinois wants it delivered within the 60 days immediately preceding the first day of the anniversary month, which is a window that closes before the anniversary rather than after it. Consequence. A $100 penalty, then another $100 for each year or fraction from the second year of delinquency. Prevention. Diary the start of the window. The Illinois annual report guide sets out how the window is counted.
Mistake 5: Looking for the franchise tax at the wrong agency
What happens. A corporation's finance team looks for Illinois franchise tax at the Department of Revenue. Why it fails. Illinois franchise tax is administered by the Secretary of State and is paid with the annual report, not with the income tax return. Consequence. An unpaid franchise obligation attached to the entity record, which is what blocks a certificate of good standing at the worst possible moment. Prevention. Treat the Secretary of State filing and the Department of Revenue registration as two separate calendars, and read Illinois entity tax rates before budgeting either.
What Illinois Wants After Admission
The annual report is $75 and is due in the 60 days immediately preceding the first day of your anniversary month. A series limited liability company adds $50 for each series. Corporations pay the same $75 and also settle franchise tax, which Illinois computes on the paid-in capital allocated to the state. The exemption threshold on that tax has been raised repeatedly in recent sessions, so most small corporations now owe nothing while still being required to file, which is a trap of its own: nothing owed reads to a busy controller like nothing due. The Illinois annual report service handles the filing and the Illinois annual report cost page lays out the year.
Separately, the Illinois Department of Revenue runs its own registration for income tax, the personal property replacement tax and sales tax. Nothing about the Secretary of State admission opens those accounts. Start with Illinois sales tax registration, add Illinois payroll tax registration if you are hiring, and read hiring employees in Illinois for the sequence. If the entity later changes its name or governance at home, amend the Illinois record through amending an Illinois filing; if the Illinois chapter ends, withdraw deliberately using closing an Illinois entity rather than letting the record lapse into reinstatement. And where an LLC has more than one member, confirm signing authority in the Illinois operating agreement.
Let File.Business get you admitted in Illinois.
We establish the real start date so the exposure is priced correctly, clear the name, appoint an Illinois registered agent, time the home-state certificate to the sixty-day rule, file LLC-45.5 or BCA 13.15, pay the $150, and diary the annual report window. First year of Illinois registered agent included.
How File.Business Handles an Illinois Admission
The first question we ask about Illinois is not which form. It is when did you start. If the answer is more than sixty days ago and the entity is a limited liability company, the penalty is already running at $100 a month and every week of assembly costs real money, so we compress the package: name clearance and agent appointment in parallel, home-state certificate ordered immediately and tracked, filing the day it lands. If the answer is next month, we sequence it the ordinary way and the certificate goes last. We file LLC-45.5 or BCA 13.15 through the Secretary of State, pay the $150, send you the acceptance, and set two dates: the annual report window that closes before your anniversary month, and the franchise tax cycle if you are a corporation. The agency-side detail is on the Illinois foreign qualification page.
Illinois foreign qualification FAQ
What does Illinois charge to admit a foreign LLC or corporation?
The application fee is $150 for a foreign limited liability company on form LLC-45.5 and $150 for a foreign corporation on form BCA 13.15. A corporation also pays an initial franchise tax computed on the paid-in capital it allocates to Illinois, so its total is higher.
What is the penalty for transacting business in Illinois without being admitted?
For a limited liability company not admitted within 60 days of commencing business, 805 ILCS 180/45-45 imposes all the fees that would have been due plus a penalty of $2,000 plus $100 for each month or fraction of a month of unadmitted trading. For a corporation, 805 ILCS 5/13.70 imposes the greater of 10% of the fees and franchise taxes avoided, or $200 plus $5 for each month or fraction.
How is the Illinois penalty period counted?
By reference to the period the company continued to transact business in Illinois without being admitted, which runs from the day it started doing business here rather than from the day the state noticed. A fraction of a month counts as a whole month.
Can an unadmitted company sue in Illinois?
No. Section 45-45(a) of the Limited Liability Company Act says a foreign LLC transacting business in Illinois may not maintain a civil action in any court of the state until it is admitted. It can still defend itself, and its contracts remain valid.
How recent must my certificate of good standing be for Illinois?
It must be an authenticated certificate of good standing or similar document from the home state dated within the last 60 days. Order it after the agent is appointed so it does not age out while the package is assembled.
When is the Illinois annual report due?
Within the 60 days immediately preceding the first day of your anniversary month. The fee is $75, plus $50 per series for a series LLC. Filing late brings a $100 penalty and a further $100 for each year or fraction from the second year of delinquency.
Which activities do not count as transacting business in Illinois?
Section 13.75 of the Business Corporation Act exempts defending or settling proceedings, internal meetings, bank accounts, selling through independent contractors, orders accepted outside Illinois, owning property without more, an isolated transaction completed within 120 days, and having an officer or director who lives in Illinois.
Ready to get admitted in Illinois?
One engagement covers the start-date review, the name clearance, the Illinois registered agent, the sixty-day certificate timing, the LLC-45.5 or BCA 13.15 filing and the $150 payment. If a penalty is already accruing at $100 a month, speed is the whole product.
Working through this in Illinois: Illinois foreign qualification covers the service, Illinois registered agent covers the address the state serves papers on, and Illinois filing fees lists the wider schedule.
The penalty figures on this page are taken from the statutes themselves rather than from a summary, because this is the number most guides get wrong.
Disclosure. File.Business is a private filing service, not a government agency and not a law firm. We prepare and submit filings at your direction, and nothing on this page is legal or tax advice. Filing fees, deadlines, and statutory references are current as of the last-updated date shown above and can change. Confirm current requirements with the relevant state agency before you file.
