Is it cheaper to form an LLC in Connecticut than Illinois?

Connecticut's filing fee is lower ($120 vs $150), but that's not the full picture: operating in Illinois means also registering as a foreign LLC there ($150) and paying a Connecticut registered agent. Realistic first-year cost is roughly $420 for the Connecticut route versus $150 for forming in Illinois.

Can I form my Illinois business in Connecticut?

Yes. Any Illinois business can form its LLC in Connecticut. But if the business operates in Illinois, it must also register there as a foreign LLC ($150 filing fee) and maintain a registered agent in Connecticut, so you take on two states' fees and filings instead of one.

Does Connecticut have better asset protection than Illinois?

Not meaningfully. Both states provide charging-order protection for LLC members, and neither offers a decisive asset-protection edge for a typical small business. Sound insurance and clean separation of business and personal finances matter more in practice.

State Comparison

Illinois LLC vs Connecticut LLC (2026)

Written for owners based in Illinois.

Verdict: for most owners, form where the business is based

Connecticut and Illinois end up close: $120 to form against $150, $80 a year against $75, and first-year totals of $200 and $225. The difference is procedural rather than financial. Connecticut requires the annual report to be delivered by electronic transmission unless the Secretary of the State grants an exemption, and more than one year in default lets the state issue a forfeiture notice and dissolve the company, with a $120 reinstatement plus every missed $80 report to undo it. Qualifying that LLC into Illinois costs $150.

Based in Connecticut? Read Connecticut LLC vs Illinois LLC →

Compare Illinois LLC vs Connecticut LLC on filing fees, taxes, privacy laws, and annual costs. Find out which state is actually better for your business.

By Edmond Hui · Last updated: September 23, 2026

If your business is based in Illinois, an Illinois LLC needs no foreign registration there; a Connecticut LLC run from Illinois generally must also register in Illinois as a foreign LLC (Illinois's $150 filing fee). If your business is based in Connecticut, a Connecticut LLC needs no foreign registration there; an Illinois LLC run from Connecticut generally must also register in Connecticut as a foreign LLC (Connecticut's $120 filing fee). An LLC formed in one of these states and run from the other owes whatever filings, fees and taxes each state requires. An Illinois LLC runs $225 in year one and $75/yr after; a Connecticut LLC runs $200 and $80/yr. See the full breakdown below.

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Factor	Illinois	Connecticut
Filing Fee	$150	$120
Processing Time	Not published by the state	Most online filings auto-accepted
Annual Report Fee	$75	$80
Annual Report Due	Before 1st of anniversary month	March 31
State Income Tax	Yes	Yes
Anonymous LLC	No	No
Publication Requirement	No	No
Foreign LLC Cost (if forming out-of-state)	N/A, you're in your home state	$150 + registered agent ~$150/yr

Full fee breakdown for either state: Illinois LLC cost and Connecticut LLC cost. Owner privacy options for either state: Illinois anonymous LLC guide and Connecticut anonymous LLC guide.

Business Climate: Illinois vs Connecticut

Factor	Illinois	Connecticut
5-year business survival rate	55.6% (#3 of 51)	51.1% (#25 of 51)
Business application growth (2026 YTD (Jan to Jul) vs 2025 YTD (same months))	+7.7% YoY (#7 of 51 by volume)	+15.6% YoY (#34 of 51 by volume)

Sources: U.S. Bureau of Labor Statistics, Business Employment Dynamics · U.S. Census Bureau, Business Formation Statistics (BFS)

See the full 50-state survival ranking.

Compare LLC Costs: Illinois vs Connecticut

State A

State B

Illinois

Formation fee$150

Annual report fee$75

State entity taxNone

Report dueBefore 1st of anniversary month

Processing timeNot published by the state

Late penalty$100

Connecticut

✓ Cheaper Upfront✓ Cheaper Long-Term

Formation fee$120

Annual report fee$80

State entity taxNone

Report dueMarch 31

Processing timeMost online filings auto-accepted

Late penalty$0

Total Cost

Illinois

Connecticut

1 Year

$225

$200

3 Years

$375

$360

5 Years

$525

$520

Will you operate outside your home state?

A figure shown as "from" is the least the state can charge, not a price. Tennessee's report is $300 for up to six members and $50 for each member above six, its franchise tax is the greater of $100 or 0.25% of Tennessee net worth, Wyoming's report is the greater of $60 or $.0002 per dollar of in-state assets, Kentucky's entity tax is $175 up to $3 million of gross receipts and graduated above it, and New York's annual filing fee is graduated on New York source gross income. A total that contains one of those is shown as "from" for the same reason. Costs include every mandatory state charge: the filing fee, the report fee (annualised where a state files biennially), any state entity-level tax shown in its own row above, a one-time publication cost where the state publishes a rate for it, and any one-time registration charge a state requires before the LLC may trade. Two exclusions follow from that wording. Arizona and Nebraska require publication and publish no rate, so no newspaper cost is carried for either and their totals are not the whole cost. Alaska's $50 annual state business licence is a separate charge from the Secretary of State fees and is not carried here either. Annualising makes the 1, 3 and 5 year rows a cost of ownership rather than a payment schedule: a biennial state charges its whole report fee in the years it falls due and nothing in between. Entity-level taxes that only apply after a corporate election, or above an owner or income threshold, are excluded and flagged on the state's own cost page. New York's publication cost is carried at a $250 floor, roughly $200 of newspaper cost in a low-cost county plus the $50 Certificate of Publication fee. No county-clerk-designated New York City newspaper publishes a rate card, so the four-figure NYC estimates in wide circulation cannot be traced to a primary source and are not asserted here; budget for materially more than the floor if you file in a NYC county. Every fee was verified against the state's own fee schedule, statute, or revenue authority on 29 July 2026. Excludes registered agent and legal fees. For informational purposes only, not legal or tax advice.

Filing Fees & Formation Costs

Illinois charges $150 to form an LLC, while Connecticut charges $120. Connecticut is $30 cheaper upfront. The cost that usually gets overlooked: if you form in Connecticut but operate in Illinois, you must also register as a foreign LLC in Illinois (a $150 filing) and maintain a registered agent in Connecticut (typically around $150 per year). That puts the realistic first-year cost of the Connecticut route at roughly $420, versus $150 for simply forming in Illinois. Only one side of this comparison is knowable: Connecticut publishes a standard turnaround (most online filings auto-accepted), while Illinois publishes no standard processing time, so the two can't be ranked against each other on speed.

Taxes: Illinois vs Connecticut

Both Illinois and Connecticut levy a personal income tax on pass-through business income, and your LLC's profits will be taxed where you live and operate. Forming in Connecticut doesn't change what an Illinois-based owner pays. Illinois levies a flat 4.95% personal income tax. Neither state imposes a separate franchise or privilege tax on LLCs beyond standard filing fees.

Privacy & Asset Protection

Neither Illinois nor Connecticut offers anonymous LLC formation: both states require owner or manager information on public filings. Connecticut's annual report discloses the LLC's members or managers, a public filing. Business owners who prioritize privacy typically form a holding company in a state like Wyoming or New Mexico instead. Both states provide charging-order protection for LLC members, and for most small businesses the practical difference in asset protection between the two is minimal.

Annual Maintenance Costs

Illinois LLCs file an annual report ($75, due in the anniversary month), and Connecticut LLCs file an annual report ($80, due March 31). If you form in Connecticut while operating in Illinois, you maintain filings in both states, Connecticut's report plus Illinois's equivalent for your foreign registration, and pay a Connecticut registered agent roughly $150 per year. Counting report fees, the agent and any entity-level tax, that brings the Connecticut route to roughly $305 a year, versus about $75 to keep a domestic Illinois LLC in good standing.

When Connecticut Actually Makes Sense

Forming in Connecticut makes sense in a few specific situations: your business genuinely operates in Connecticut, with a real office, employees, or property there, or you're relocating to Connecticut in the near future. For a typical small business based in Illinois, none of these usually apply. Registering a Connecticut LLC to do business back home means $150 in Illinois foreign-registration fees, on top of Connecticut's $120 formation fee, while Illinois's own annual report runs $75 a year and is due in the anniversary month. When in doubt, form where you actually do business.

Frequently Asked Questions

: Connecticut's filing fee is lower ($120 vs $150), but that's not the full picture: operating in Illinois means also registering as a foreign LLC there ($150) and paying a Connecticut registered agent. Realistic first-year cost is roughly $420 for the Connecticut route versus $150 for forming in Illinois.
: Yes. Any Illinois business can form its LLC in Connecticut. But if the business operates in Illinois, it must also register there as a foreign LLC ($150 filing fee) and maintain a registered agent in Connecticut, so you take on two states' fees and filings instead of one.
: Not meaningfully. Both states provide charging-order protection for LLC members, and neither offers a decisive asset-protection edge for a typical small business. Sound insurance and clean separation of business and personal finances matter more in practice.
: It depends on where the business is based. For an Illinois-based business, Illinois: forming where the business is based keeps costs and compliance simple, and Connecticut is worth considering only if you actually do business there. For a Connecticut-based business, the same reasoning points to Connecticut.
: Only one side of this comparison is knowable: Connecticut publishes a standard turnaround (most online filings auto-accepted), while Illinois publishes no standard processing time, so the two can't be ranked against each other on speed. Whichever you pick, remember that forming in Connecticut while operating in Illinois means you're not fully set up until the Illinois foreign registration is also processed, so the out-of-state route is rarely the faster path end to end. If your timing is genuinely fixed, buy the state's expedite tier rather than relying on a standard turnaround.

Comparison chart of forming an LLC in Illinois versus Connecticut, contrasting filing fees, annual report cost and ongoing obligations across 8 factors. — Illinois and Connecticut side by side on the factors that decide where to form. Source: MyStateLLC 50-state cost dataset, verified against each Secretary of State's published fee schedule, July 2026.

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More State Comparisons

Illinois vs Delaware →Illinois vs Florida →Illinois vs Georgia →Illinois vs Wyoming →Connecticut vs Delaware →

Illinois LLC Guide →Connecticut LLC Guide →

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Sources

Each entry below is a document recorded in our verified sources, and each entry says what the document is. Some statutory text is read from an accurate mirror rather than from the state's own host, and those say so.

ilsos.gov/departments/business-services/limited-liability-companies.htmlIllinois Secretary of State: business entity filings
ilga.gov/legislation/ILCS/details?ActName=Limited+Liability+Company+Act.&ActID=2290&ChapterID=65&ChapAct=805+ILCS+180%2F&SeqStart=14450000&SeqEnd=15800000Illinois LLC filing fees
business.ct.gov/business-servicesConnecticut Secretary of State: business entity filings
business.ct.gov/-/media/businessonestop/fee-schedule-revised-712020.pdfConnecticut LLC filing fees

Edmond Hui · Founder, MyStateLLC

Edmond Hui is a software engineer and serial entrepreneur based in New York who has founded multiple online businesses across e-commerce, media, and information publishing. Before transitioning into tech, he spent years as a commercial real estate professional closing deals totaling over 100,000 square feet, giving him firsthand experience with business formation and entity structuring. He built MyStateLLC to provide the free, state-specific LLC guidance he wished existed when forming his own companies.