A Chicago Accountant Who Knows Illinois Taxes

What a Chicago Small Business Accountant Actually Does

A good small business accountant is a year-round partner, not a March filing service. The job starts with setup: choosing between an LLC, S-corp, or C-corp and getting the entity registered with the Illinois Secretary of State and the Illinois Department of Revenue. Then comes the monthly engine — clean books in QuickBooks or Xero, reconciled bank accounts, payroll runs, sales tax filings for businesses that sell taxable goods, and 1099s for contractors at year-end.

For a Chicago business specifically, the accountant also owns the local details: Illinois has no state-level business license for most companies, but the City of Chicago requires most businesses to register for a business license, and food, retail, and professional services have their own city and state layers. Between the state, Cook County, and the city, a business that sells goods in Chicago can owe sales tax to all three jurisdictions — and the accountant is the one who makes sure every registration and filing deadline is met before the penalties start accruing.

Illinois Tax Rates Every Chicago Owner Should Know

Illinois's income tax is a flat 4.95% — locked in by the state constitution, which requires a single rate, after voters rejected a graduated-tax amendment in 2020. For LLC and S-corp owners, that flat rate applies to pass-through income on top of federal tax. C-corporations face a combined 9.5% — the 7% corporate rate plus the 2.5% personal property replacement tax — and then shareholders pay tax again on dividends. That double layer is why most small businesses choose pass-through status, and why an accountant's entity advice is worth real money at formation time.

Sales tax is where Illinois surprises people. Chicago's combined rate — state, county, city, and transit district portions — tops 10%, among the highest in the country. If you sell taxable goods or certain services in the city, you must register with the Illinois Department of Revenue, collect the tax, and file on the state's schedule. Remote sellers and marketplace sellers face the same registration duties under Illinois's marketplace rules. An accountant who knows Illinois sales tax will tell you exactly when registration is triggered — and will stop you from the classic mistake of collecting tax you never remit, which turns into personal liability fast.

Entity Choice in Illinois: LLC, S-Corp, or C-Corp

Most Chicago small businesses start as LLCs — simple to form, flexible, and the default protection for personal assets. But the LLC's tax treatment has a ceiling: all net profit flows to you as self-employment income, and once your business is profitable, the self-employment tax on that income starts to hurt. That is when the S-corp election becomes the accountant's standard move — the business pays you a reasonable salary (subject to payroll tax) and the remaining profit passes through without self-employment tax. The trade-off is payroll administration: an S-corp must run payroll and file the related returns, which is why the election only pays off above roughly $40,000–$60,000 of net profit.

C-corporations are the right answer less often than owners think. The 9.5% Illinois corporate rate plus the federal 21% rate means entity-level tax of nearly 30% before any dividend — a heavy load for a business whose owners just want the profit personally. C-corps make sense when you plan to reinvest heavily, need to attract investors, or want to offer equity incentives. In Illinois, where the pass-through rates are flat and predictable, most service businesses are better off as an LLC or S-corp — and the accountant who runs that math for you before you file the formation paperwork is worth the fee.

What a Chicago Accountant Costs — and How to Choose One

Chicago accounting rates sit near the national average for a major city. Monthly bookkeeping for a small business typically runs $300–$900 depending on transaction volume; business tax preparation runs $500–$1,800 based on entity type and complexity; and bundled bookkeeping-plus-tax packages usually come with a discount. Formation and sales tax registration are often one-time setup fees of $300–$800. The pricing model to look for is flat and written down — a monthly fee for a defined scope, with catch-up cleanup quoted separately before it starts.

Choose by fit, not just price. Ask whether the accountant works with businesses your size in your industry, whether they use cloud bookkeeping you can see in real time, and whether tax strategy — entity choice, estimated payments, sales tax planning — is included or billed hourly. A Chicago accountant who files one return a year and disappears is not a partner; the value is in the monthly discipline that makes tax season boring. And for anything requiring a CPA's credential — audited financials, certain attest work, or representing you before the IRS in serious disputes — confirm the person you hire actually holds the Illinois CPA license.

Frequently Asked Questions