Illinois sales tax debt: IDOR collection, liability and the Tax Tribunal
Last updated · Reviewed for accuracy against IRS.gov guidance
Illinois sales tax is legally the Retailers' Occupation Tax, administered by the Illinois Department of Revenue (IDOR) at a 6.25% state rate plus local taxes. IDOR can hold responsible officers personally liable and offers payment plans. Disputes over $15,000 in tax for a period can go to the Illinois Independent Tax Tribunal, which charges a $500 filing fee.
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Retailers' Occupation Tax
What most people call Illinois sales tax is technically the Retailers' Occupation Tax (ROT) — a tax on the retailer's business of selling, which retailers pass to customers. Its companion, Use Tax, applies to purchases where ROT wasn't paid. The general state rate is 6.25% (a lower rate applies to qualifying food and drugs), and home-rule and non-home-rule local taxes add to it. IDOR administers both.
How balances build
Unfiled ROT returns lead IDOR to issue notices and, eventually, a Notice of Tax Liability. Illinois imposes late-filing and late-payment penalties under its Uniform Penalty and Interest Act, and interest runs on unpaid tax. Use the amounts on your IDOR notice — the penalty depends on how late the return or payment was and whether it followed a notice.
Personal liability
Illinois law (the Uniform Penalty and Interest Act, 35 ILCS 735/3-7) allows IDOR to assess a personal liability penalty against officers or employees responsible for filing returns and paying tax who willfully failed to do so. IDOR issues a Notice of Penalty Liability to the individual. It's the Illinois counterpart to the federal Trust Fund Recovery Penalty.
Payment plans and collection
IDOR offers payment plans for taxpayers who can't pay in full, generally requiring current filings. Unresolved balances can lead to liens, levies, referral to collection agencies and, for retailers, revocation of the Certificate of Registration needed to sell. IDOR can also refuse to renew certain state licenses for unpaid taxes.
Disputes: Board of Appeals and the Tax Tribunal
The Illinois Independent Tax Tribunal hears disputes when IDOR issues a Notice of Deficiency, Notice of Tax Liability, Notice of Claim Denial or Notice of Penalty Liability and the tax for a period exceeds $15,000, excluding interest and penalties (or penalties and interest alone exceed $15,000). Petitions are filed within the statutory deadline with a $500 filing fee. Smaller cases go through IDOR's administrative hearing process. Check the protest deadline on your notice; then run the free business tax relief assessment.
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Start the calculatorFrequently asked questions
Is Illinois sales tax the same as the Retailers' Occupation Tax?
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Yes, in practice. Illinois 'sales tax' is the Retailers' Occupation Tax plus related local occupation taxes, with Use Tax covering purchases where it wasn't paid.
When can I go to the Illinois Independent Tax Tribunal?
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When the IDOR notice involves more than $15,000 of tax for a period (excluding penalties and interest), or more than $15,000 of penalties and interest alone. The filing fee is $500.
Can IDOR hold me personally liable?
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Yes. Responsible officers and employees who willfully fail to file or pay can be assessed a personal liability penalty through a Notice of Penalty Liability.
Can I go to jail for not paying Illinois sales tax?
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Criminal charges are possible in most states for knowingly keeping collected tax, but the overwhelming majority of cases are handled civilly through billings, penalties, liens and levies. If you've received a criminal investigation notice, talk to a tax attorney before anything else.
Does closing the business end the sales tax debt?
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No. Closing stops new liability from accruing, but assessed tax, penalties and interest remain, and states commonly pursue owners or officers personally for collected-but-unremitted tax.
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Sources
IRS figures on this page (rates, fees, thresholds) verified as of 2026-11-04. See our editorial policy.
TaxSettlementCalculator.com is not a tax firm, law firm, CPA, or government agency and is not affiliated with the IRS or any state tax agency. Estimates are for educational purposes only and are not tax, legal, or financial advice. Results vary based on individual circumstances, and no outcome is guaranteed. We connect users with independent tax relief professionals.