Illinois laws that reach small businesses
Eighteen short guides to the Illinois laws small employers and owners meet most, from forming an LLC to wage payment, human rights, consumer rules and state taxes.
Prepared by Prem Tax and Accounting Corp. Last checked against official sources on October 29, 2026.
Illinois law covers how you form and run a business, how you pay and treat staff, how you sell and advertise, and what you owe the state. It can apply to work and business anywhere in Illinois, Cook County included. Each guide gives the key numbers with their year and a checklist.
- Entities: LLCs, corporations, partnerships, medical corporations and professional service corporations.
- Contracts and customers: the UCC, automatic renewals, contractor payment, consumer fraud and deceptive trade practices.
- Staff: wage payment, human rights, workplace safety and non-compete rules.
- Data, tax and schools: data breach notices, income tax, sales and use tax, and private vocational schools.
Illinois OSHA covers public employers only, so private employers answer to federal OSHA. Federal laws apply too, and Cook County adds a layer for work there.
Illinois LLC rules for owners: a short guide
The Illinois LLC Act in plain English: 2026 filing fees, the annual report window, late penalties, member liability and when a professional needs a PLLC.
Read →Running an Illinois corporation: a short guide
The Illinois Business Corporation Act in plain English: 2026 fees, the franchise tax and its $10,000 exemption, the annual report and late penalties.
Read →Illinois partnerships and LLPs: a short guide for owners
The Illinois Uniform Partnership Act in plain English: no-filing partnerships, county name rules, 2026 LLP fees and who answers for partnership debts.
Read →Medical corporations in Illinois: a short guide for physician owners
The Illinois Medical Corporation Act in plain English: who may own shares, the two filings, 2026 fees, IDFPR renewal timing and late penalties.
Read →Professional corporations in Illinois: a short guide for licensed owners
The Illinois Professional Service Corporation Act in plain English: who may own stock, the two filings, 2026 fees, renewal wording and liability limits.
Read →The Illinois UCC: a short guide for small business owners
The Illinois UCC in plain English for small business owners: goods contracts, warranties, UCC-1 loan filings and deadlines, with slides, a table and a chart.
Read →Illinois auto-renewal law: a short guide for sellers
The Illinois auto-renewal law in plain English for sellers: clear terms, trial reminders, renewal notices and penalties, with slides, a table and a chart.
Read →Illinois prompt payment for contractors: a short guide
Illinois prompt payment rules for private construction jobs in plain English: payment deadlines, retainage caps and late interest, with slides and a chart.
Read →Illinois Wage Payment and Collection Act: an owner's cheat sheet
Illinois Wage Payment and Collection Act cheat sheet: payday timing, final pay, deductions, pay stubs and the cost of late pay, with slides and a chart.
Read →Illinois Human Rights Act: job rules on one page
Illinois Human Rights Act cheat sheet for employers: who is covered, the 2-year IDHR charge deadline, yearly training and 2026 changes, with slides and chart.
Read →Illinois OSHA: which safety agency covers your workplace
Illinois OSHA cheat sheet: which workplaces answer to Illinois OSHA and which to federal OSHA, with 2026 penalties, a slide show, a chart and a checklist.
Read →Illinois non-competes and non-solicits: a short guide
Illinois non-compete and non-solicit rules in plain English: 2026 pay floors of $75,000 and $45,000, 14-day review and carve-outs, with slides and a chart.
Read →Illinois private business and vocational schools: the IBHE permit rules
The Illinois Private Business and Vocational Schools Act in plain English: IBHE approval, 2017 fee tables, renewal dates and penalties up to $10,000.
Read →The Illinois Consumer Fraud Act, in plain English
The Illinois Consumer Fraud Act in plain English for small business owners: who it covers, penalties up to $50,000, the 3-year suit deadline and a checklist.
Read →The Illinois Uniform Deceptive Trade Practices Act, simply put
The Illinois Uniform Deceptive Trade Practices Act in plain English: the 12 listed practices, the injunction remedy, how it links to the Consumer Fraud Act.
Read →Illinois PIPA: a short data breach guide for business owners
Illinois PIPA for small businesses: what counts as personal information, breach notice to residents and the Attorney General, disposal rules and penalties.
Read →Illinois income tax for small businesses: a short guide
The Illinois Income Tax Act in plain English: 2026 rates, replacement tax, estimated tax, withholding and late penalties for small business owners.
Read →Illinois sales tax for small businesses: a short guide
Illinois sales tax explained for small business owners: the Retailers' Occupation and Use Tax, 2026 rates, remote sellers, resale certificates and due dates.
Read →Common questions
Is the Illinois minimum wage higher than the federal one?
Yes. Illinois sets $15.00 an hour (since January 1, 2025) for employers with four or more employees. The federal rate in 2026 is $7.25, and a covered worker gets the higher rate.
Does the Illinois Human Rights Act reach a small employer?
It can. It covers private employers with one or more employees in Illinois, with a 20-week test for most claims. Sexual harassment, pregnancy and some disability claims have no weeks test.
I am in DuPage, Kane, Will or Kendall county. What changes?
Those counties generally follow state law, so federal and Illinois law apply, plus any rules your own town sets. Cook County ordinances generally do not reach you unless you have premises or staff working in Cook County.
Official sources
- Illinois General Assembly: Illinois Human Rights Act, 775 ILCS 5
- Illinois Department of Labor: Minimum Wage Law
- Illinois Department of Human Rights: Employment rights
- Illinois Department of Revenue
- U.S. Department of Labor: State minimum wage laws
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