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

No. South Dakota costs the same upfront ($150 vs $150), and if you operate in Illinois you must also register there as a foreign LLC ($150) plus pay a South Dakota registered agent. Realistic first-year cost is roughly $450 versus $150 for forming locally.

Can I form my Illinois business in South Dakota?

Yes. Any Illinois business can form its LLC in South Dakota. 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 South Dakota, so you take on two states' fees and filings instead of one.

Does South Dakota 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 South Dakota LLC (2026)

Compare Illinois LLC vs South Dakota 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 Illinois beats South Dakota. Illinois runs $225 in year one and $75/yr after; South Dakota runs $205 and $55/yr. See the full breakdown below.

Verdict: Illinois wins for most businesses

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

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Factor	Illinois	South Dakota
Filing Fee	$150	$150
Processing Time	Not published by the state	Not published by the state
Annual Report Fee	$75	$55
Annual Report Due	Before 1st of anniversary month	Anniversary month
State Income Tax	Yes	No
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 South Dakota LLC cost.

Business Climate: Illinois vs South Dakota

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

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

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

Total Cost

Illinois

South Dakota

1 Year

$225

$205

3 Years

$375

$315

5 Years

$525

$425

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

Illinois charges $150 to form an LLC, while South Dakota charges $150. The upfront filing fees are identical. The cost that usually gets overlooked: if you form in South Dakota but operate in Illinois, you must also register as a foreign LLC in Illinois (a $150 filing) and maintain a registered agent in South Dakota (typically around $150 per year). That puts the realistic first-year cost of the South Dakota route at roughly $450, versus $150 for simply forming in Illinois. Speed isn't a basis for choosing between them: neither Illinois nor South Dakota publishes a standard processing time, so any figure comparing the two is guesswork.

Taxes: Illinois vs South Dakota

South Dakota has no personal income tax while Illinois does, but forming your LLC in South Dakota won't change that. LLC profits pass through to you and are taxed where you live and operate (in Illinois), not where the LLC is registered, so a South Dakota LLC offers no income-tax savings for an Illinois-based business. 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 South Dakota offers anonymous LLC formation: both states require owner or manager information on public filings. South Dakota's annual report confirms the LLC's ownership/management each year on the public record. 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 South Dakota LLCs file an annual report ($55, due in the anniversary month). If you form in South Dakota while operating in Illinois, you maintain filings in both states, South Dakota's report plus Illinois's equivalent for your foreign registration, and pay a South Dakota registered agent roughly $150 per year. That brings ongoing costs of the South Dakota route to roughly $280 per year, versus about $75 to keep a domestic Illinois LLC in good standing.

When South Dakota Actually Makes Sense

Forming in South Dakota makes sense in a few specific situations: your business genuinely operates in South Dakota, with a real office, employees, or property there, or you're relocating to South Dakota in the near future, which would also move you out of Illinois's personal income tax. For a typical small business based in Illinois, none of these usually apply. Registering a South Dakota LLC to do business back home means $150 in Illinois foreign-registration fees, on top of South Dakota's $150 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

: No. South Dakota costs the same upfront ($150 vs $150), and if you operate in Illinois you must also register there as a foreign LLC ($150) plus pay a South Dakota registered agent. Realistic first-year cost is roughly $450 versus $150 for forming locally.
: Yes. Any Illinois business can form its LLC in South Dakota. 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 South Dakota, 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.
: Illinois, for most. Forming where you operate keeps costs and compliance simple. South Dakota 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 Illinois nor South Dakota 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 South Dakota 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 South Dakota, contrasting filing fees, annual report cost and ongoing obligations across 8 factors. On balance this guide favours Illinois. — Illinois and South Dakota 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

Illinois vs Tennessee →Illinois vs Texas →Illinois vs Utah →Illinois vs Delaware →South Dakota vs Delaware →

Illinois LLC Guide →South Dakota LLC Guide →

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