Illinois LLC Taxes: Replacement Tax, Income Tax and What an LLC Actually Owes

If you formed an LLC in Illinois, the question of what you actually owe in taxes is straightforward in some ways and surprisingly complex in others. Unlike many states, Illinois imposes no franchise tax on LLCs. But that does not mean your LLC pays nothing. The real bills come from the personal property replacement tax, your personal income tax as an owner, and the annual Secretary of State filing fee. Understanding which taxes apply to your LLC structure depends on how many members you have and whether you have elected S-corporation taxation.

No Franchise Tax on Illinois LLCs

Start here: Illinois imposes no franchise tax on LLCs. You will not see a bill for existing as an LLC in this state, no annual franchise tax fee, and no tax based simply on the fact that your business is registered. That puts Illinois ahead of many states that charge annual franchise taxes or corporate existence taxes regardless of profit or activity.

The confusion usually starts because people see the $75 annual report fee owed to the Secretary of State each year and assume that is a tax. It is not. That $75 is a filing fee for maintaining your LLC registration with the state. It is due before the first day of your LLC anniversary month each year (the month you filed your Articles of Organization), and it is separate from any state tax obligations.

The Personal Property Replacement Tax: What Multi-Member LLCs Actually Pay

The headline tax obligation for most Illinois LLCs is the personal property replacement tax, and it applies specifically to multi-member LLCs taxed as partnerships. This is not a one-time fee. It is an annual tax on your net income, and it exists because Illinois eliminated its personal property tax on business property and replaced it with this income-based tax.

The illinois replacement tax rate is 1.5 percent of net income. That means if your multi-member LLC has taxable net income of $100,000 for the year, you owe $1,500 to the Illinois Department of Revenue for the personal property replacement tax.

This applies only if your LLC is taxed as a partnership. For federal purposes, a multi-member LLC is treated as a partnership by default unless you elect otherwise. That partnership status flows through to Illinois state taxation: you file Form IL-1065, Illinois Partnership Return of Income, and the replacement tax obligation kicks in.

One important nuance: the replacement tax is calculated on net income. That means you subtract legitimate business expenses, depreciation, and losses from your gross revenue before calculating the tax. You do not pay 1.5 percent on every dollar that came in the door; you pay it only on what remains after deductions.

Single-Member LLCs: The Disregarded Entity Rule

If your LLC has only one member (just you), Illinois treats it as a disregarded entity for income tax purposes by default. That means your LLC does not file a separate state return. Instead, the LLC income flows directly to your personal tax return, and you report it on your individual Illinois income tax return.

This sounds simpler, and in terms of filing it is. But it does not eliminate tax obligations. The income is still taxable in Illinois at the 4.95 percent individual rate on your personal return. The 1.5 percent replacement tax is owed by partnerships and S corporations, not by an individual reporting a disregarded single-member LLC's income.

Single-member LLC owners sometimes assume that because there is no separate LLC return, there are no Illinois LLC taxes. That is incorrect. The LLC's net income is taxed on your individual Illinois return at 4.95 percent, even though there is no separate LLC return.

Individual Income Tax: What LLC Owners Pay on Their Share

Beyond the replacement tax, you as an LLC owner owe personal state income tax on your share of LLC net income. Illinois has a flat personal income tax rate of 4.95 percent, effective since July 2017. This rate applies to all individuals, trusts, and estates, and it applies to your LLC income as well.

Here is how the math works in practice. Suppose your multi-member LLC has $100,000 in net income for the year. After you pay your 1.5 percent replacement tax ($1,500), you still owe personal income tax on your individual share of that income. If you are a 50-50 partner, your $50,000 share is subject to the 4.95 percent state income tax, which equals $2,475. Add that to the $750 replacement tax on your individual share (your 50 percent of the $1,500 LLC replacement tax), and your total Illinois state tax bill is $3,225.

That calculation shows why understanding both taxes matters. The replacement tax is a business-level obligation; personal income tax is an owner-level obligation. They layer on top of each other.

How to File: Form IL-1065 and Reporting Requirements

Multi-member LLCs file Form IL-1065, Illinois Partnership Return of Income, with the Illinois Department of Revenue. This return reports the LLC gross income, expenses, and net income, and it calculates the personal property replacement tax owed.

Filing deadline depends on your federal filing deadline. If your LLC is on a calendar year (January 1 to December 31), your Illinois return is due by the same deadline as your federal Form 1065, which is typically March 15 or later depending on federal extension.

Individual LLC members receive a Schedule K-1-P, reporting their share of LLC income. They use that information to file their personal Illinois income tax returns. The owner-level tax is paid as part of each individual's state income tax return, not from the LLC account.

You can file and pay taxes through the Illinois Department of Revenue online at https://tax.illinois.gov/. Many LLC owners work with a CPA or tax professional to handle the IL-1065 filing, especially if the LLC has multiple members or complicated expense allocation.

S-Corporation Election: A Tax Strategy to Consider

Some LLC owners in Illinois elect to be taxed as an S-corporation instead of a partnership. This is a federal election made on IRS Form 2553, but it changes how Illinois taxes the business as well.

If an Illinois LLC elects S-corporation status, the LLC is still subject to the 1.5 percent personal property replacement tax. But the replacement tax applies only to the net business income, not to reasonable W-2 wages paid to owner-employees. This can result in lower replacement tax liability if you are taking a reasonable salary as an owner-employee.

The trade-off is complexity. S-corps require payroll setup, W-2 reporting, self-employment tax considerations, and a separate S-corporation return. For very small LLCs with one owner and modest income, the added compliance cost often outweighs the tax savings. For larger LLCs with higher profits, the reduction in replacement tax can be significant enough to justify the additional bookkeeping.

This is a decision best made with a CPA or tax advisor who can run the numbers for your specific situation.

The Difference: LLCs, C-Corps, and S-Corps in Illinois

It is worth noting how Illinois LLC taxes compare to other entity types, so you understand what you chose when you formed your LLC.

A C-corporation in Illinois pays a 7 percent corporate income tax on net income plus a 2.5 percent personal property replacement tax, for an effective 9.5 percent combined state tax on profits. That is significantly higher than the 1.5 percent replacement tax alone for a multi-member LLC.

An S-corporation pays only the 1.5 percent replacement tax (on net income minus W-2 wages), which is the same as an LLC. The difference is how the entity structure affects self-employment tax and how owner income is distributed. That is a federal consideration, not an Illinois state tax consideration.

A sole proprietorship pays the 4.95 percent personal income tax on business income, just as a single-member LLC owned by an individual does. From an Illinois state tax perspective, there is no advantage to being a sole proprietor instead of a single-member LLC. The LLC structure provides liability protection at no additional Illinois tax cost.

Annual Secretary of State Reporting: The $75 Fee

Beyond the replacement tax and income tax, your LLC owes a $75 annual report filing fee to the Illinois Secretary of State. This is due before the first day of your LLC anniversary month each year. The due date is determined by the month you originally filed your Articles of Organization.

If you miss the deadline, the LLC is not in good standing, and a $100 penalty applies if the report is not filed before the first day of the second month after the anniversary month. Continued delinquency can lead to administrative dissolution, which would terminate your LLC status and expose you to personal liability that the LLC structure was supposed to protect.

This is not optional and not a tax in the traditional sense, but it is a recurring cost of maintaining your LLC in good standing with the state.

Sales Tax Is Separate

This article focuses on Illinois state income taxes and the replacement tax, but do not overlook sales tax if your LLC sells goods or certain services. Illinois has a state sales tax rate of 6.25 percent, and many counties and cities add local sales taxes on top of that. If you are selling taxable products, you need a Certificate of Registration from the Illinois Department of Revenue and must collect and remit sales tax to the state.

Sales tax is collected from customers and remitted to the state; it is not a tax on your business income. But it is a significant compliance obligation and often a larger dollar figure than your income tax.

What Your Illinois LLC Actually Owes: A Summary

Here is the bottom line for an Illinois multi-member LLC with $100,000 in net annual income:

• Personal property replacement tax to the Illinois Department of Revenue: $1,500 (1.5 percent of net income)
• Personal income tax owed by each owner on their share: varies by ownership percentage (4.95 percent flat rate)
• Annual report filing fee to the Secretary of State: $75
• No franchise tax: $0

For a single-member LLC owned by an individual with the same $100,000 net income, there is no IL-1065 and no 1.5 percent replacement tax. The income is reported on your individual return and taxed at 4.95 percent, and the $75 annual report still applies.

Action Items for Your Illinois LLC

If you own an Illinois LLC and are not already tracking these obligations, start here:

1. Confirm your LLC anniversary month. Your annual report is due before the first day of that month.
2. Determine whether your LLC is taxed as a partnership (default for multi-member LLCs) or if you have elected S-corporation treatment.
3. Set aside funds for the 4.95 percent personal income tax owed by each owner and, for multi-member LLCs and S corporations, the 1.5 percent replacement tax on net income.
4. Work with a CPA or tax professional to file Form IL-1065 (if multi-member) or to report LLC income on individual returns by the appropriate deadline.
5. Ensure the $75 annual report fee is paid before the due date to maintain good standing.

Important Disclaimer

This article is informational content about Illinois LLC tax obligations and is not legal advice, tax advice, or professional accounting guidance. Tax law is specific to your situation, and the figures and deadlines mentioned here are accurate as of the date of publication but can change. Every LLC is different: your income level, business structure, and tax strategy will affect what you actually owe.

Before making any decisions about your LLC tax strategy, including whether to elect S-corporation taxation, consult with a qualified CPA, tax attorney, or tax professional licensed in Illinois. The Illinois Department of Revenue website at https://tax.illinois.gov/ has official guidance, and the Small Business Administration's Illinois district office can also point you to local resources.

Take the time to understand your obligations now rather than scrambling at tax time. The 1.5 percent replacement tax and the 4.95 percent personal income tax are real bills due to the state, and the $75 annual report fee is a compliance requirement. Plan for them, and your Illinois LLC will stay in good standing and out of trouble with the tax authorities.