Is it cheaper to form an LLC in Illinois than South Dakota?

No. Illinois costs the same upfront ($150 vs $150), and if you operate in South Dakota you must also register there as a foreign LLC ($750) plus pay an Illinois registered agent. Realistic first-year cost is roughly $1,050 versus $150 for forming locally.

Can I form my South Dakota business in Illinois?

Yes. Any South Dakota business can form its LLC in Illinois. But if the business operates in South Dakota, it must also register there as a foreign LLC ($750 filing fee) and maintain a registered agent in Illinois, so you take on two states' fees and filings instead of one.

Does Illinois have better asset protection than South Dakota?

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

South Dakota LLC vs Illinois LLC (2026)

Compare South Dakota LLC vs Illinois 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: August 13, 2026

For most businesses, forming an LLC in South Dakota beats Illinois. South Dakota runs $205 in year one and $55/yr after; Illinois runs $225 and $75/yr. See the full breakdown below.

Verdict: South Dakota wins for most businesses

For most South Dakota-based businesses, forming locally in South Dakota is the smarter choice. You avoid paying fees in two states and managing compliance in both. Illinois only makes sense if your business genuinely operates there, and even then the total costs deserve a hard look.

Ready to file? Our affiliate partner ZenBusiness files your South Dakota LLC formation paperwork, from $0 + state fee.

Start your South Dakota LLC with ZenBusiness →

Affiliate link. We may earn a commission at no cost to you · compare all formation services. MyStateLLC is not a law firm and does not provide legal advice.

Factor	South Dakota	Illinois
Filing Fee	$150	$150
Processing Time	Not published by the state	Not published by the state
Annual Report Fee	$55	$75
Annual Report Due	Anniversary month	Before 1st of anniversary month
State Income Tax	No	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	$750 + registered agent ~$150/yr

Full fee breakdown for either state: South Dakota LLC cost and Illinois LLC cost.

Business Climate: South Dakota vs Illinois

Factor	South Dakota	Illinois
5-year business survival rate	52.7% (#19 of 51)	55.6% (#3 of 51)
Business application growth (2026 YTD (Jan to Jul) vs 2025 YTD (same months))	+15.4% YoY (#47 of 51 by volume)	+7.7% YoY (#7 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: South Dakota vs Illinois

State A

State B

South Dakota

✓ Cheaper Long-Term

Formation fee$150

Annual report fee$55

State entity taxNone

Report dueAnniversary month

Processing timeNot published by the state

Late penalty$55

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

Total Cost

South Dakota

Illinois

1 Year

$205

$225

3 Years

$315

$375

5 Years

$425

$525

Will you operate outside your home state?

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 a state requires publication, and any one-time registration charge a state requires before the LLC may trade. 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. Montana's annual report is free when filed by April 15 and $35 after, a waiver the Secretary of State applies at its discretion. 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

South Dakota charges $150 to form an LLC, while Illinois charges $150. The upfront filing fees are identical. The cost that usually gets overlooked: if you form in Illinois but operate in South Dakota, you must also register as a foreign LLC in South Dakota (a $750 filing) and maintain a registered agent in Illinois (typically around $150 per year). That puts the realistic first-year cost of the Illinois route at roughly $1,050, versus $150 for simply forming in South Dakota. Speed isn't a basis for choosing between them: neither South Dakota nor Illinois publishes a standard processing time, so any figure comparing the two is guesswork.

Taxes: South Dakota vs Illinois

South Dakota has no personal income tax, while Illinois taxes individual income. Since pass-through LLC profits are taxed where you live and operate, a South Dakota-based owner keeps South Dakota's no-income-tax benefit either way. Forming in Illinois adds no tax advantage. 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 South Dakota nor Illinois offers anonymous LLC formation: both states require owner or manager information on public filings. Illinois doesn't permit anonymous LLC formation; management is disclosed on public filings. 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

South Dakota LLCs file an annual report ($55, due in the anniversary month), and Illinois LLCs file an annual report ($75, due in the anniversary month). If you form in Illinois while operating in South Dakota, you maintain filings in both states, Illinois's report plus South Dakota's equivalent for your foreign registration, and pay an Illinois registered agent roughly $150 per year. That brings ongoing costs of the Illinois route to roughly $280 per year, versus about $55 to keep a domestic South Dakota LLC in good standing.

When Illinois Actually Makes Sense

Forming in Illinois makes sense in a few specific situations: your business genuinely operates in Illinois, with a real office, employees, or property there, or you're relocating to Illinois in the near future and accept taking on Illinois's personal income tax, which South Dakota doesn't levy. For a typical small business based in South Dakota, none of these usually apply. Registering an Illinois LLC to do business back home means $750 in South Dakota foreign-registration fees, on top of Illinois's $150 formation fee, while South Dakota's own annual report runs $55 a year and is due in the anniversary month. When in doubt, form where you actually do business.

Frequently Asked Questions

: No. Illinois costs the same upfront ($150 vs $150), and if you operate in South Dakota you must also register there as a foreign LLC ($750) plus pay an Illinois registered agent. Realistic first-year cost is roughly $1,050 versus $150 for forming locally.
: Yes. Any South Dakota business can form its LLC in Illinois. But if the business operates in South Dakota, it must also register there as a foreign LLC ($750 filing fee) and maintain a registered agent in Illinois, 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.
: South Dakota, for most. Forming where you operate keeps costs and compliance simple. Illinois is worth considering only if you actually do business there or have investor requirements that point there.
: Speed isn't a basis for choosing between them: neither South Dakota nor Illinois publishes a standard processing time, so any figure comparing the two is guesswork. Only 19 of the 50 states publish anything about non-expedited turnaround at all. Whichever you pick, remember that forming in Illinois while operating in South Dakota means you're not fully set up until the South Dakota 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 South Dakota versus Illinois, contrasting filing fees, annual report cost and ongoing obligations across 8 factors. On balance this guide favours South Dakota. — South Dakota and Illinois 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.

More State Comparisons

South Dakota vs Indiana →South Dakota vs Iowa →South Dakota vs Kansas →South Dakota vs Delaware →Illinois vs Delaware →

South Dakota LLC Guide →Illinois LLC Guide →

📎

Embed this comparison, free

Add the South Dakota vs Illinois cost calculator to any page. Works in WordPress, Squarespace, Webflow, and any HTML site.

<iframe src="https://www.mystatellc.com/tools/compare-states?embed=1&stateA=SD&stateB=IL" width="100%" height="720" frameborder="0" style="border:0;max-width:900px;display:block;margin:0 auto;" title="South Dakota vs Illinois LLC Cost Comparison" loading="lazy"></iframe>
<p style="text-align:center;font-size:.8125rem;color:#6b7280">Source: <a href="https://www.mystatellc.com/llc/compare/south-dakota-llc-vs-illinois-llc">MyStateLLC, South Dakota vs Illinois LLC Comparison</a></p>