Is it cheaper to form an LLC in Connecticut or Idaho?

Idaho is cheaper at formation ($100) than Connecticut ($120). Ongoing costs are also different: $100 vs $180 per year. Total over three years: $400 vs $660.

Can I form an LLC in Connecticut if I live in Idaho?

Yes, but your Idaho business will almost certainly need to register as a foreign LLC in Idaho too, which means paying Idaho's foreign registration fee and any ongoing Idaho obligations on top of the Connecticut ones. The "form elsewhere to save" math usually doesn't work for operating businesses; it only works when you have no physical operations tied to any specific state.

How long does it take to form an LLC in Connecticut vs Idaho?

Connecticut online: 5 business days; Idaho online: 7 business days. Connecticut offers paid expedite from $50. Idaho offers paid expedite from $40.

Which state has lower taxes for an LLC, Connecticut or Idaho?

Connecticut: state income tax applies to member-level pass-through income, no entity-level franchise or LLC tax. Idaho: state income tax applies to member-level pass-through income, no entity-level franchise or LLC tax.

Do both states require a registered agent?

Yes. Every US state (and DC) requires every LLC to maintain a registered agent with a physical street address in the state. Connecticut and Idaho both have this requirement. You can serve as your own agent if you live in the state; most out-of-state filers use a commercial agent for $50 to $125 per year.

Which state should I pick if I run an online business from home?

Form in the state you actually live in. Your home state's Department of Revenue treats your residence as nexus regardless of where the LLC is filed, which means you owe state income tax there anyway. Forming in Connecticut or Idaho to escape your home state's tax doesn't work; it adds paperwork. The non-resident filings make sense when you genuinely operate nowhere in particular: international founders, purely passive holding entities, or real-estate LLCs owning property in other states.

Connecticut vs Idaho LLC comparison

Connecticut charges $120 to form an LLC; Idaho charges $100. Day-one sticker price is only part of the story, since most of the real cost comes from the annual obligations that stack up each year you keep the LLC open.

Over a rolling three-year window, Idaho runs about $260 less in total state fees than Connecticut. Whether that gap matters depends on whether you actually operate in one of these states or are weighing a non-resident filing.

On speed, Connecticut typically clears standard online filings faster than Idaho. Both states offer expedited tiers at an additional cost for filers on tight timelines.

For most small operators the choice is not really between these two states at all. It is between forming where the business actually operates and trying to route through a non-resident filing. The data below shows what each option actually costs.

Formation filing fee

Connecticut $120

Idaho $100

Idaho saves $20

Year 1 total estimate

Connecticut $300

Idaho $200

Idaho saves $100

Ongoing per year

Connecticut $180

Idaho $100

Idaho saves $80

3-year total

Connecticut $660

Idaho $400

Idaho saves $260

Key differences at a glance

Idaho costs $20 less to form ($100 vs $120).
Idaho is $80 per year cheaper to maintain ($100 vs $180).

Where each state fits

For most filers, forming in the state you actually operate from is the right call. The side-by-side below shows where the two states meaningfully diverge.

Three-year cost, side by side

Rough estimate of the state-facing cost to form and keep an LLC through three years. Both totals include a $100 per year registered-agent estimate.

Connecticut Idaho

Year 1

$300

$200

Year 2

$480

$300

Year 3

$660

$400

Running total includes the one-time filing fee and annual ongoing costs (report fee or franchise tax plus a $100/year registered agent estimate).

What it costs under your specific situation

The table below runs the same LLC through four common scenarios. "Non-resident" rows assume a typical home-state foreign LLC registration adds about $200 per year of stacked cost; the real number depends on which state you live in and ranges from $50 to over $800 depending on jurisdiction.

Scenario	Year 1	Each year after	3-year total
You live in Connecticut, business operates there No foreign LLC registration needed. You pay Connecticut fees only.	$300	$180	$660
You live in Idaho, business operates there No foreign LLC registration needed. You pay Idaho fees only.	$200	$100	$400
Non-resident forming in Connecticut with operations elsewhere You pay Connecticut's fees plus a typical home-state foreign LLC registration of about $200 per year.	$500	$380	$1,260
Non-resident forming in Idaho with operations elsewhere You pay Idaho's fees plus a typical home-state foreign LLC registration of about $200 per year.	$400	$300	$1,000

Connecticut vs Idaho: full comparison

Dimension	Connecticut	Idaho
Online filing Can you file the formation document online?	Yes	Yes
Online approval time Standard, non-expedited	5 business days	7 business days
Expedited option Paid fast-track filing	$50	$40
Annual report Required in addition to tax	Required, $80	Required, $0
State-imposed annual tax Franchise, privilege, or LLC tax minimum	None	None
State income tax On pass-through LLC income at member level	Yes	Yes
Publication requirement Newspaper publication after formation	No	No
Operating agreement Required by state statute	Recommended, not required	Recommended, not required
Foreign LLC fee Cost to register as a foreign LLC in this state	$120	$100
State sales tax General statewide rate	6.3%	6.0%

Taxes in Connecticut and Idaho

How each state handles entity-level tax on LLCs. Pass-through classification means member-level income tax also applies at each member's residence state.

Connecticut tax

No entity-level franchise tax on LLCs. State income tax applies to member-level pass-through income. Corporate rate 7.5%.

Idaho tax

No entity-level franchise tax on LLCs. State income tax applies to member-level pass-through income. Corporate rate 5.3%.

Ongoing compliance

The recurring filings each state requires after formation.

Connecticut

Annual report $80, due 03/31 each year. Registered agent required in Connecticut.

Idaho

Annual report $0, due on your anniversary month. Registered agent required in Idaho.

Formation process, side by side

What actually happens from the moment you start filing to the moment you're in good standing. Use this as a checklist.

Connecticut

Check business-name availability on the Connecticut entity search.
Appoint a registered agent with a physical Connecticut street address.
File Certificate of Organization (Limited Liability Company, Domestic) for $120.
Wait for approval. Online typically 5 business days. Paid expedite from $50.
Adopt an operating agreement (recommended, not required by Connecticut statute).
Apply for a federal EIN (free from the IRS).
Open a business bank account to separate personal and business finances.
File your first annual report and pay $80 when it comes due.

Idaho

Check business-name availability on the Idaho entity search.
Appoint a registered agent with a physical Idaho street address.
File Certificate of Organization Limited Liability Company for $100.
Wait for approval. Online typically 7 business days. Paid expedite from $40.
Adopt an operating agreement (recommended, not required by Idaho statute).
Apply for a federal EIN (free from the IRS).
Open a business bank account to separate personal and business finances.
File your first annual report and pay $0 when it comes due.

Before you pick either state

A few things that apply no matter which state you choose. These trip up enough first-time filers that they're worth stating explicitly.

Registered agent is non-negotiable. Both Connecticut and Idaho (and every other US state) require every LLC to designate a registered agent with a physical street address in the state of formation. You can serve as your own agent if you live in the state; otherwise a commercial agent runs $50 to $125 per year. Using your own home address makes it part of the public record.

Forming elsewhere does not escape your home state's tax. If you live and operate a business from your home state, forming the LLC in Connecticut or Idaho does not avoid your home state's income tax. The moment you transact business at home, your home state requires a foreign LLC registration, and state tax liability follows your residence regardless of where the entity sits on paper.

EIN applications are free. The IRS issues Employer Identification Numbers directly at no cost. Any service charging you to "get your EIN" is reselling a free form submission. Single-member LLCs with no employees technically don't need one for federal tax, but nearly every bank requires an EIN to open a business account.

Operating agreement matters more than the state you pick. A well-drafted operating agreement governs member ownership, management, profit splits, buy-sell terms, and dissolution. Without one, your LLC runs on the state's default rules, which are rarely what you want. California, Maine, Missouri, and New York require a written one by statute; every other state treats it as strongly recommended.

Agency contacts

Connecticut Secretary of the State, Business Services Division

Website: portal.ct.gov/sots
Phone: (860) 509-6003
Mail: Business Services Division, P.O. Box 150470, Hartford, CT 06115-0470
Office: 165 Capitol Avenue, Suite 1000, Hartford, CT 06106
Hours: 8:30 AM to 4:30 PM Eastern, Monday to Friday

Idaho Secretary of State - Business Services Division

Website: sos.idaho.gov
Phone: (208) 334-2301
Mail: Office of the Secretary of State, 450 N 4th Street, PO Box 83720, Boise, ID 83720-0080
Office: 450 N 4th Street, Boise, ID 83702
Hours: 8:00 AM to 5:00 PM Mountain, Monday to Friday

Connecticut Department of Revenue Services

Website: portal.ct.gov/drs
Phone: (860) 297-5962
Email: drs@ct.gov
Mail: 450 Columbus Boulevard, Suite 1, Hartford, CT 06103
Hours: 8:30 AM to 4:30 PM Eastern, Monday to Friday

Idaho State Tax Commission

Website: tax.idaho.gov
Phone: (208) 334-7660
Mail: Idaho State Tax Commission, PO Box 36, Boise, ID 83722-0410
Office: 11321 W Chinden Blvd, Building 2, Boise, ID 83714
Hours: 8:00 AM to 5:00 PM Mountain, Monday to Friday

Frequently Asked Questions

Is it cheaper to form an LLC in Connecticut or Idaho?

Idaho is cheaper at formation ($100) than Connecticut ($120). Ongoing costs are also different: $100 vs $180 per year. Total over three years: $400 vs $660.
Can I form an LLC in Connecticut if I live in Idaho?

Yes, but your Idaho business will almost certainly need to register as a foreign LLC in Idaho too, which means paying Idaho's foreign registration fee and any ongoing Idaho obligations on top of the Connecticut ones. The "form elsewhere to save" math usually doesn't work for operating businesses; it only works when you have no physical operations tied to any specific state.
How long does it take to form an LLC in Connecticut vs Idaho?

Connecticut online: 5 business days; Idaho online: 7 business days. Connecticut offers paid expedite from $50. Idaho offers paid expedite from $40.
Which state has lower taxes for an LLC, Connecticut or Idaho?

Connecticut: state income tax applies to member-level pass-through income, no entity-level franchise or LLC tax. Idaho: state income tax applies to member-level pass-through income, no entity-level franchise or LLC tax.
Do both states require a registered agent?

Yes. Every US state (and DC) requires every LLC to maintain a registered agent with a physical street address in the state. Connecticut and Idaho both have this requirement. You can serve as your own agent if you live in the state; most out-of-state filers use a commercial agent for $50 to $125 per year.
Which state should I pick if I run an online business from home?

Form in the state you actually live in. Your home state's Department of Revenue treats your residence as nexus regardless of where the LLC is filed, which means you owe state income tax there anyway. Forming in Connecticut or Idaho to escape your home state's tax doesn't work; it adds paperwork. The non-resident filings make sense when you genuinely operate nowhere in particular: international founders, purely passive holding entities, or real-estate LLCs owning property in other states.

Full state guides

ConnecticutOpen Connecticut LLC guide →
IdahoOpen Idaho LLC guide →

More Connecticut and Idaho comparisons

More Connecticut vs ...

More Idaho vs ...

Sources

Filing fee: business.ct.gov/knowledge-base/articles/domestic-limited-liability-com… · verified April 21, 2026
Connecticut Secretary of the State Business Services: Certificate of Organization (formation of a domestic LLC) fee is $120. Same fee applies whether filed online through Business.CT.gov or by mail.
Expedited filing: business.ct.gov/knowledge-base/articles/expedited-services · verified April 21, 2026
Connecticut expedited service fee is $50 per transaction. Expedited service is only available for online filings through Business.CT.gov (not available for mail). Expedited filings typically process within 24 hours.
Annual report fee: business.ct.gov/knowledge-base/articles/domestic-limited-liability-com… · verified April 21, 2026
Annual Report fee = $80, filed online between January 1 and March 31 each year. Same $80 fee applies to foreign LLCs (Foreign Annual Report).
Franchise tax: www.cttaxalert.com/2019/08/business-entity-tax-repeal/ · verified April 21, 2026
Connecticut Public Act 19-117 (2019 budget bill) repealed the $250 biennial Business Entity Tax (Conn. Gen. Stat. Sec. 12-284b) effective for tax years beginning on or after January 1, 2020. Connecticut no longer imposes a franchise tax or business entity tax on LLCs. Flagged as applies: false per the instructions.
Foreign LLC registration fee: business.ct.gov/knowledge-base/articles/foreign-limited-liability-comp… · verified April 21, 2026
Connecticut Foreign Registration Statement (foreign LLC): $120 filing fee, matching the domestic Certificate of Organization. Foreign LLCs also file the $80 Annual Report between January 1 and March 31.
Sales tax rate: portal.ct.gov/drs/sales-tax/sales-and-use-tax-information · verified April 21, 2026
Connecticut Department of Revenue Services: statewide general sales and use tax rate is 6.35%. Connecticut does not authorize local sales taxes. A higher 7.75% rate applies to certain luxury goods and a 1% rate applies to computer and data processing services.
Corporate income tax rate: portal.ct.gov/drs/corporation-tax/corporation-business-tax · verified April 21, 2026
Connecticut Corporation Business Tax (CBT) base rate is 7.5% on net income. A 10% CBT surtax has been extended through income years beginning before January 1, 2026 by Public Act 24-151. The 7.5% is Connecticut's income-only corporate rate; the surtax and PTET are noted in taxes.notes rather than folded into this number.
Business name search: service.ct.gov/business/s/onlinebusinesssearch?language=en_US · verified April 21, 2026
Connecticut Business Records Search via the CT.gov portal. Use before filing to confirm name availability.
Online filing portal: business.ct.gov/ · verified April 21, 2026
Business.CT.gov is the official online filing portal for Connecticut business formation, annual reports, and amendments. Filings typically complete within 3 to 5 business days (standard) or about 1 business day with the $50 expedited fee.
Operating agreement requirement: law.justia.com/codes/connecticut/title-34/chapter-613a/section-34-243d… · verified April 21, 2026
Conn. Gen. Stat. Sec. 34-243a defines an operating agreement as the agreement of all members whether oral, implied, in a record, or any combination. No statutory requirement that the agreement be written or filed. Recorded as not required.
Publication requirement: law.justia.com/codes/connecticut/title-34/chapter-613a/ · verified April 21, 2026
Connecticut Uniform Limited Liability Company Act (Chapter 613a) contains no newspaper publication requirement. LLCs are not required to publish notice of formation.
Filing fee: sos.idaho.gov/CORP/forms/LLC/LLC%20Cert%20org.pdf · verified April 21, 2026
Idaho SoS Certificate of Organization Limited Liability Company form (Title 30, Chapters 21 and 25, Idaho Code): base filing fee is $100.00. Paper filings add a $20.00 manual processing fee, bringing the paper total to $120.00. Online filings through SOSBiz are the $100 base rate.
Expedited filing: sos.idaho.gov/CORP/forms/LLC/LLC%20Cert%20org.pdf · verified April 21, 2026
Certificate of Organization instructions: expedited service adds $40.00 (8-hour); same-day service adds $100.00. Recording the cheapest expedited tier (8-hour, $40) as the default expedited fee.
Foreign LLC registration fee: sos.idaho.gov/business-forms/ · verified April 21, 2026
Foreign LLC Foreign Registration Statement base filing fee is $100.00 online through SOSBiz; paper filings add the $20 manual processing fee for a $120 paper total.
Operating agreement requirement: legislature.idaho.gov/statutesrules/idstat/Title30/T30CH25/ · verified April 21, 2026
Idaho Uniform Limited Liability Company Act, Idaho Code Title 30, Chapter 25, does not require a written operating agreement. The Certificate of Organization instructions explicitly state: 'Please do not attach operating agreements. They are not filed with this office.' (Idaho Code Section 30-25-201(C)).
Publication requirement: sos.idaho.gov/business-forms/ · verified April 21, 2026
Idaho Uniform LLC Act and SoS filing instructions contain no publication requirement for LLCs.
Annual report fee: sos.idaho.gov/annual-report-help/ · verified April 21, 2026
Idaho annual report filing fee is $0 for online filing through SOSBiz. Paper annual report filings incur the $20 manual processing fee. Due by the end of the anniversary month; administrative dissolution follows 60 days of non-filing.
Franchise tax: tax.idaho.gov/ · verified April 21, 2026
Idaho State Tax Commission imposes no franchise tax on LLCs. C-corps (including LLCs electing C-corp treatment) pay the 5.3% corporate income tax with a $20 minimum; this is an income tax, not a franchise tax.
Corporate income tax rate: tax.idaho.gov/pressrelease/whats-new-for-2025-income-tax-returns/ · verified April 21, 2026
Idaho corporate income tax rate reduced to 5.3% (flat) effective retroactive to January 1, 2025, per House Bill signed in 2025. Previous rate was 5.695%. The 5.3% rate continues in 2026. Corporate minimum tax is $20. Idaho individual rate is also a flat 5.3%.
Sales tax rate: tax.idaho.gov/taxes/sales-use/ · verified April 21, 2026
Idaho statewide sales and use tax rate is 6.0%. A small number of resort cities may impose local option sales taxes, but there is no general local sales tax.
Business name search: sosbiz.idaho.gov/search/business · verified April 21, 2026
Idaho SOSBiz business entity search. Confirm name availability before filing Certificate of Organization (Idaho Code Section 30-21-301 governs LLC name requirements).
Online filing portal: sosbiz.idaho.gov/ · verified April 21, 2026
Idaho SOSBiz is the online business filing portal. Requires free account. Online filings bypass the $20 manual processing fee that applies to paper submissions.

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