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

Tax savings depend on your income level. For profits over $60,000, S-Corp election can save 15.3% self-employment tax on distributions. For example, with $100,000 profit, paying yourself a $60,000 salary and $40,000 distribution could save about $6,120 in self-employment taxes annually.

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

File Form 2553 with the IRS within 2 months and 15 days of your tax year start (or entity formation). This is a federal election that applies to both LLCs and corporations. You don't need to file anything additional with Illinois - the state follows federal S-Corp elections.

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

Yes, Illinois LLCs can elect S-Corp taxation by filing Form 2553 with the IRS. This gives you S-Corp tax benefits while maintaining LLC flexibility. You keep your LLC structure but get taxed like an S-Corp, including the salary/distribution split for tax savings.

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

Illinois imposes a $150 annual LLC fee and requires an annual report. Both LLCs and S-Corps pay the same state income tax rates as pass-through entities. Illinois doesn't impose additional franchise taxes, making it relatively business-friendly compared to states like California.

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

Consider S-Corp election when your business consistently generates over $60,000 in annual profits. The timing should account for payroll setup costs, quarterly tax payments, and additional compliance. Many businesses make the switch at year-end to start the new tax year with S-Corp status.

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

While not required, an accountant is highly recommended for S-Corp taxation. You'll need to run payroll, file quarterly payroll taxes, annual corporate tax returns, and ensure reasonable salary compliance. The complexity and potential audit risks make professional help worthwhile for most businesses.

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: January 2026

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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	All profits subject to 15.3% self-employment tax	Only salary subject to payroll taxes, distributions tax-free
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 business income is under $60,000 annually (self-employment tax savings minimal)
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 business generates over $60,000 in annual profit consistently
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 have 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

In Illinois, the S-Corp tax election typically becomes beneficial when business profits exceed $60,000 annually. At this income level, the payroll tax savings from distributions often outweigh the additional costs of running payroll and maintaining corporate compliance.

Frequently Asked Questions

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