How much can I save in taxes with an S-Corp versus LLC in Illinois?

Whether the election pays depends on your profit, the salary your work would command and the added payroll and tax filing costs, so run the figures with a tax professional before you elect. For example, if your Illinois LLC generates $100,000 in profit, you'd pay yourself a reasonable W-2 salary of $60,000 and take a $40,000 distribution. Illinois also imposes no state-level self-employment tax, making federal savings your only benefit. Calculate your specific scenario by consulting a CPA to determine your break-even point before filing election forms with both the IRS and Illinois Department of Revenue.

How do I elect S-Corp status for my Illinois business?

To elect S-Corp status for your Illinois LLC, file IRS Form 2553 (Election by a Small Business Corporation) with the IRS no more than 2 months and 15 days after the start of the tax year the election is to take effect. For a new LLC, the first tax year begins on the earliest of the date it first has owners, first has assets or begins doing business. Missing this deadline moves the election to the next tax year unless the IRS grants late-election relief under Rev. Proc. 2013-30. Illinois automatically recognizes your federal S-Corp election; the Illinois Secretary of State requires no separate state filing or fee. This election fundamentally changes your tax obligation: instead of paying self-employment taxes on 92.35% of business income (the 12.4% Social Security part stops at the annual wage base), you only pay them on W-2 wages you take, potentially saving 15.3% on retained earnings. Contact the IRS or visit irs.gov to confirm your entity's tax year, then prepare and file Form 2553 immediately to avoid penalties and compliance complications.

Can my Illinois LLC be taxed as an S-Corp?

Yes, your Illinois LLC can elect S-Corp taxation by filing Form 2553 (Election by a Small Business Corporation) with the IRS, no more than 2 months and 15 days after the start of the tax year the election is to take effect. For a new LLC, the first tax year begins on the earliest of the date it first has owners, first has assets or begins doing business. Illinois doesn't impose additional state-level S-Corp election fees beyond the federal filing, though you'll remain subject to Illinois's $75 annual LLC Report fee, due before the first day of your formation anniversary month to the Illinois Secretary of State. This election allows you to maintain your LLC's liability protection and operational flexibility while receiving S-Corp tax treatment, which enables you to split income between W-2 wages (subject to payroll taxes) and distributions (subject only to income tax). This salary/distribution strategy typically saves self-employment taxes compared to sole proprietorship or standard LLC taxation. The practical benefit: as an S-Corp-taxed LLC, you could reduce self-employment taxes by 15.3% on your distribution portion, potentially saving thousands annually. Next step: consult a CPA or tax professional to determine your reasonable salary threshold, then file Form 2553 with the IRS and maintain proper payroll records.

Does Illinois have special taxes for LLCs or S-Corps?

Illinois imposes a $75 annual report fee (Form LLC-50.1), due before the first day of your formation anniversary month to the Illinois Secretary of State. Both LLCs and S-Corps are taxed as pass-through entities at Illinois's flat 4.95% individual income tax rate, meaning profits pass through to owners' personal tax returns. However, S-Corps offer a potential federal self-employment tax advantage. Owners can take a reasonable salary and distribute remaining profits as dividends, avoiding the 15.3% self-employment tax on that distribution portion. For LLCs, Illinois has no corporate franchise tax, but it does charge a $75 annual report fee and imposes the 1.5% Personal Property Replacement Tax on LLCs taxed as partnerships or S corporations. This $150 annual cost is minimal compared to the potential self-employment tax savings an S-Corp election could provide if your LLC generates substantial net income. File your LLC annual report and fee payment with the Illinois Secretary of State website by March 15th to maintain good standing and avoid penalties.

When should I switch from LLC to S-Corp taxation?

Whether the election pays depends on your profit, the salary your work would command and the added payroll and tax filing costs, so run the figures with a tax professional before you elect. You'll file Form 2553 (Election by a Small Business Corporation) with the IRS; Illinois automatically recognizes the federal S election, so no separate state form is required. However, you must run quarterly payroll through an Illinois-registered employer (obtaining an EIN from the IRS), which costs $500 to $1,500 annually. Time your election for January 1st by filing both forms by March 15th of that year. Start by calculating your actual tax savings using an accountant familiar with Illinois LLC taxation, then proceed with payroll setup if the numbers justify the administrative burden.

Do I need an accountant for S-Corp taxes in Illinois?

While not legally required, an accountant is highly recommended for S-Corp taxation in Illinois. You'll need to run payroll through the state's payroll tax agencies, file quarterly federal and state payroll tax returns (941-PR and IL-941), and submit an annual Form 1120-S to the IRS by March 15th. Illinois corporations file an annual report (Form BCA 14.05) with the franchise tax, and C corporations pay a 7% income tax plus a 2.5% Personal Property Replacement Tax. S-Corps demand strict reasonable salary compliance, the IRS scrutinizes owner-compensation levels, and underpaying yourself invites audit risk and penalties. Missing payroll deadlines triggers penalties exceeding 25% of unpaid taxes. Payroll processing and the extra accounting an S-Corp needs are added yearly costs, and their price depends on the provider. Contact the Illinois Secretary of State's business services division or consult a CPA experienced with S-Corp elections to schedule a tax planning consultation before your fiscal year-end.

Illinois LLC vs S-Corp: Making the Right Choice for Your Business

Understand the key differences between LLCs and S-Corps in Illinois, including taxes, flexibility, and costs to choose the best structure for your business goals.

By Edmond Hui · Last updated: October 2026

In Illinois, an LLC fits when you want maximum flexibility in management and ownership structure; a S-corp fits when your profit is high enough that the self-employment tax saved on distributions is larger than the added payroll and tax filing costs. Compare both structures in detail below.

Read this guide for another state:

Affiliate disclosure: We may earn a commission at no extra cost to you.

Form your LLC with Northwest ($39 + state fee)Includes a year of registered agent service. After year one, registered agent service is $125/yr. That enrolls you by default in annual report filing at $100 plus state fees, charged automatically to your saved payment method and cancellable any time.

Not sure which service is right? Compare formation services →

Comparison chart for Illinois LLC versus S-Corp, contrasting liability, taxation and ongoing filing burden across 8 factors. — Side-by-side on the factors that decide the choice, for Illinois. Source: Illinois Secretary of State.

LLC vs S-Corp: Side-by-Side

Factor	LLC	S-Corp
Formation cost	$150 state filing fee to Illinois Secretary of State	$150 state filing fee + federal S-Corp election (Form 2553)
Ownership limits	Unlimited owners, any type of investor allowed	Maximum 100 shareholders, must be U.S. citizens/residents
Management	Flexible management structure, member or manager-managed	Corporate structure required: board of directors, officers, shareholders
Self-employment tax	92.35% of profits subject to 15.3% self-employment tax, with the 12.4% Social Security part capped at the annual wage base	Only salary is subject to payroll taxes. Distributions are not, but the profit is still taxed as income
Payroll required	No payroll requirements for members	Must run payroll and pay reasonable salary to owner-employees
State taxes in Illinois	Pass-through taxation, members pay on personal returns	Pass-through taxation, shareholders pay on personal returns
Complexity	Simple ongoing compliance, annual report required	More complex: payroll, corporate formalities, multiple tax filings
Conversion path	Can elect S-Corp tax status without changing entity	Difficult to convert to LLC without tax consequences

When an LLC Makes More Sense

You want maximum flexibility in management and ownership structure
Your profit is not yet high enough for the self-employment tax an S-Corp election saves to exceed its added payroll and tax filing costs
You plan to have non-U.S. investors or multiple classes of ownership
You prefer simpler ongoing compliance and administrative requirements

When an S-Corp Makes More Sense

Your profit is high enough that the self-employment tax saved on distributions is larger than the added payroll and tax filing costs
You want to minimize self-employment taxes through salary/distribution split
You're comfortable with corporate formalities and payroll requirements
All owners are U.S. citizens or residents and you've fewer than 100 shareholders

Tax Deep Dive

LLC Default Tax

Illinois LLCs are taxed as pass-through entities by default, meaning all business profits flow through to members' personal tax returns. Members pay both income tax and self-employment tax (15.3%) on their share of profits, regardless of how much they actually withdraw from the business.

S-Corp Tax

S-Corps in Illinois provide tax savings through a salary/distribution split strategy. Owner-employees must pay themselves a reasonable salary subject to payroll taxes, but additional profits can be distributed as dividends that avoid self-employment tax. This creates potential savings on the 15.3% self-employment tax portion.

Breakeven Income

There is no single profit figure at which an S-Corp election starts to pay for an Illinois LLC. The election saves self-employment tax only on profit you take as distributions above a reasonable salary, and it adds payroll and tax filing costs. Whether the saving is larger than those costs depends on your profit, the salary your work would command and any Illinois tax that applies to S corporations, so run the figures with a tax professional before you elect.

Calculate Your Tax Savings in Illinois

Enter your profit and filing status to compare estimated annual taxes for LLC, S-Corp, and C-Corp side by side, specific to Illinois.

This guide is general information, not legal or tax advice, and reading it does not create an attorney-client relationship. It reports published tax rates and statutory attributes, with the sources this page cites. It cannot tell you which structure is better for you: that turns on your profit, the salary you could defend as reasonable compensation, every state you owe tax in, and plans for owners, investors and exit that no figure on this page measures. Confirm your own position with a CPA or tax attorney licensed in your state before you elect anything, because some elections are slow or costly to reverse.

Frequently Asked Questions

: Whether the election pays depends on your profit, the salary your work would command and the added payroll and tax filing costs, so run the figures with a tax professional before you elect. For example, if your Illinois LLC generates $100,000 in profit, you'd pay yourself a reasonable W-2 salary of $60,000 and take a $40,000 distribution. Illinois also imposes no state-level self-employment tax, making federal savings your only benefit. Calculate your specific scenario by consulting a CPA to determine your break-even point before filing election forms with both the IRS and Illinois Department of Revenue.
: To elect S-Corp status for your Illinois LLC, file IRS Form 2553 (Election by a Small Business Corporation) with the IRS no more than 2 months and 15 days after the start of the tax year the election is to take effect. For a new LLC, the first tax year begins on the earliest of the date it first has owners, first has assets or begins doing business. Missing this deadline moves the election to the next tax year unless the IRS grants late-election relief under Rev. Proc. 2013-30. Illinois automatically recognizes your federal S-Corp election; the Illinois Secretary of State requires no separate state filing or fee. This election fundamentally changes your tax obligation: instead of paying self-employment taxes on 92.35% of business income (the 12.4% Social Security part stops at the annual wage base), you only pay them on W-2 wages you take, potentially saving 15.3% on retained earnings. Contact the IRS or visit irs.gov to confirm your entity's tax year, then prepare and file Form 2553 immediately to avoid penalties and compliance complications.
: Yes, your Illinois LLC can elect S-Corp taxation by filing Form 2553 (Election by a Small Business Corporation) with the IRS, no more than 2 months and 15 days after the start of the tax year the election is to take effect. For a new LLC, the first tax year begins on the earliest of the date it first has owners, first has assets or begins doing business. Illinois doesn't impose additional state-level S-Corp election fees beyond the federal filing, though you'll remain subject to Illinois's $75 annual LLC Report fee, due before the first day of your formation anniversary month to the Illinois Secretary of State. This election allows you to maintain your LLC's liability protection and operational flexibility while receiving S-Corp tax treatment, which enables you to split income between W-2 wages (subject to payroll taxes) and distributions (subject only to income tax). This salary/distribution strategy typically saves self-employment taxes compared to sole proprietorship or standard LLC taxation. The practical benefit: as an S-Corp-taxed LLC, you could reduce self-employment taxes by 15.3% on your distribution portion, potentially saving thousands annually. Next step: consult a CPA or tax professional to determine your reasonable salary threshold, then file Form 2553 with the IRS and maintain proper payroll records.
: Illinois imposes a $75 annual report fee (Form LLC-50.1), due before the first day of your formation anniversary month to the Illinois Secretary of State. Both LLCs and S-Corps are taxed as pass-through entities at Illinois's flat 4.95% individual income tax rate, meaning profits pass through to owners' personal tax returns. However, S-Corps offer a potential federal self-employment tax advantage. Owners can take a reasonable salary and distribute remaining profits as dividends, avoiding the 15.3% self-employment tax on that distribution portion. For LLCs, Illinois has no corporate franchise tax, but it does charge a $75 annual report fee and imposes the 1.5% Personal Property Replacement Tax on LLCs taxed as partnerships or S corporations. This $150 annual cost is minimal compared to the potential self-employment tax savings an S-Corp election could provide if your LLC generates substantial net income. File your LLC annual report and fee payment with the Illinois Secretary of State website by March 15th to maintain good standing and avoid penalties.
: Whether the election pays depends on your profit, the salary your work would command and the added payroll and tax filing costs, so run the figures with a tax professional before you elect. You'll file Form 2553 (Election by a Small Business Corporation) with the IRS; Illinois automatically recognizes the federal S election, so no separate state form is required. However, you must run quarterly payroll through an Illinois-registered employer (obtaining an EIN from the IRS), which costs $500 to $1,500 annually. Time your election for January 1st by filing both forms by March 15th of that year. Start by calculating your actual tax savings using an accountant familiar with Illinois LLC taxation, then proceed with payroll setup if the numbers justify the administrative burden.
: While not legally required, an accountant is highly recommended for S-Corp taxation in Illinois. You'll need to run payroll through the state's payroll tax agencies, file quarterly federal and state payroll tax returns (941-PR and IL-941), and submit an annual Form 1120-S to the IRS by March 15th. Illinois corporations file an annual report (Form BCA 14.05) with the franchise tax, and C corporations pay a 7% income tax plus a 2.5% Personal Property Replacement Tax. S-Corps demand strict reasonable salary compliance, the IRS scrutinizes owner-compensation levels, and underpaying yourself invites audit risk and penalties. Missing payroll deadlines triggers penalties exceeding 25% of unpaid taxes. Payroll processing and the extra accounting an S-Corp needs are added yearly costs, and their price depends on the provider. Contact the Illinois Secretary of State's business services division or consult a CPA experienced with S-Corp elections to schedule a tax planning consultation before your fiscal year-end.

Sources

2 documents

Each entry below is a document recorded in our verified Illinois 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

More for Illinois LLCs

Start and set up

Taxes, money and growth

Stay compliant

Operate in other states

Compare structures

By owner type

Forming an LLC in Illinois?

See how Northwest Registered Agent, Bizee, ZenBusiness and LegalZoom, the formation services we partner with, compare on 3-year cost, BBB rating and Trustpilot score before you choose.

Compare Services →

Ready to Form Your Illinois LLC?

Affiliate disclosure: We may earn a commission at no extra cost to you.

Not sure which service is right? Compare formation services →

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.

How we check facts

LLC vs S-Corp: Side-by-Side

When an LLC Makes More Sense

When an S-Corp Makes More Sense

Tax Deep Dive

LLC Default Tax

S-Corp Tax

Breakeven Income

Calculate Your Tax Savings in Illinois

Frequently Asked Questions

Sources

More for Illinois LLCs

Start and set up

Taxes, money and growth

Stay compliant

Operate in other states

Compare structures

By owner type

By profession

Ready to Form Your Illinois LLC?

More Illinois LLC Guides

Related guides