This article is for Chicago-based earners who receive income without traditional payroll withholding, such as 1099 workers, gig workers, and consultants. If you’re earning income without automatic withholding, quarterly estimated taxes likely apply to you. Because the U.S. uses a pay-as-you-earn tax system, the IRS expects individuals to pay tax on income as it is earned. When no taxes are withheld by an employer, estimated tax payments become the way you stay compliant and avoid underpayment penalties. Although Chicago does not impose a local income tax, you’re still responsible for federal income and self-employment taxes, as well as Illinois state income tax if you expect to owe more than $1,000 after credits and withholding. Failing to plan or missing deadlines can result in penalties and interest—even if you pay your full annual tax bill later.
What Are Quarterly Estimated Taxes?
Quarterly estimated taxes are periodic payments you make to cover your expected tax liability on income that isn’t subject to withholding. This includes:
- Federal income tax
- Self-employment tax
- Illinois state income tax
For federal taxes, the IRS requires estimated payments if you expect to owe $1,000 or more after withholding and credits. This system spreads your payments across the year instead of waiting until tax filing season. The IRS uses Form 1040-ES and associated worksheets to help you estimate and pay these taxes. On the state side, Illinois requires estimated payments if your expected liability exceeds $1,000 after credits and withholding. Unlike payroll withholding for W-2 workers, estimated taxes are your responsibility to calculate and send either by mail or online on or before quarterly due dates.
Who in Chicago Needs to Pay Quarterly Taxes?
People in Chicago that would need to pay quarterly taxes are 1099 workers, side hustlers, and multi-state earners. 1099 workers are examples of taxpayers who typically owe quarterly estimated taxes because clients don’t withhold income tax. If you earn net income from self-employment, your taxes won’t be withheld automatically, putting you in the estimated tax system. Side hustlers with additional income on top of W-2 wages may also need to pay quarterly if their withholding doesn’t cover the total tax due. For multi-state earners, you still pay federal and Illinois estimated taxes based on your Illinois residency and income that isn’t withheld. Other states might also require separate estimated payments depending on where you work. In short, if you expect to owe more than $1,000 in federal or state tax for the year after credits and withholding, quarterly estimated payments are usually required.
Illinois-Specific Tax Considerations
Illinois imposes a flat state income tax on individual earnings, meaning all taxable income is taxed at a single rate, unlike states with graduated brackets. If your total Illinois tax due is expected to exceed $1,000, you’re required to make quarterly estimated payments. These are due on similar dates to federal payments and are paid through the Illinois Department of Revenue online system or by mail. While Chicago has no local income tax, freelancers should still be aware of business licenses, registration fees, or city requirements that might apply depending on their services. Missing state estimated payments can result in penalties like underpayment interest, so planning for both federal and Illinois estimated payments together is key.
How to Calculate Quarterly Taxes
Calculating estimated taxes involves projecting your annual income, deductions, and credits, then dividing your expected tax liability into quarterly payments. The IRS provides Form 1040-ES, which includes worksheets to help estimate federal taxes and self-employment tax. You’ll estimate your total tax for the year, subtract any withholding and credits, and divide the remainder across four payments.
To avoid underpayment penalties, many freelancers use IRS safe harbor rules: paying at least 90% of the current year’s tax or 100% of the prior year’s tax liability generally keeps you penalty-free. Tools like accounting software, spreadsheets, and professional guidance can help refine these estimates, especially if your income varies by quarter. Common mistakes include underestimating revenue, forgetting self-employment tax, and failing to update estimates as income changes.
On the Illinois side, state estimated tax worksheets function similarly, requiring annual income projections and quarterly payment calculations.
Quarterly Tax Deadlines Freelancers Miss
Estimated tax payments follow the IRS’s calendar for quarterly due dates—typically:
- April 15
- June 15
- September 15
- January 15 (following year)
These dates reflect income earned through the prior period. Illinois estimated payments generally follow similar schedules: April 15, June 15, September 15, and January 15 of the following year. Missing these deadlines can trigger underpayment penalties and interest, even if you pay the full amount later. If a due date falls on a weekend or holiday, the deadline shifts to the next business day.
Should Chicago Freelancers Work With a Tax Professional?
Many freelancers start out managing taxes themselves, but hiring a CPA or tax professional can make a big difference once your income grows or you have complex deductions and multi-state obligations. At Jacobwise & Co, a tax professional can help you accurately estimate quarterly payments, avoid underpayment penalties, maximize deductions, and stay compliant with both federal and Illinois requirements. You can work with virtual accountants known for freelancer expertise, or choose someone familiar with Chicago and Illinois tax nuances. If juggling estimates feels overwhelming or you want peace of mind before filing season, seeking for professional help is worth considering.
At Jacobwise & Co, we provide tax preparation, bookkeeping, and advisory services for individuals and small businesses across multiple states. Our approach focuses on clarity, compliance, and proactive planning so clients can make confident financial decisions year-round.
Book an appointment with our team →book.jacobwiseco.com
For more information, please visit our Chicago page.