US Tax Filing in Illinois (CPA & EA Prepared)
Federal and Illinois state returns prepared and signed by a licensed CPA & EA, with IRS representation included, flat fee.
US Tax Filing in Illinois, done right
Everything your Illinois business needs, handled by one licensed CPA & EA team.
Federal returns
1040, 1120, 1120-S and 1065 returns prepared and e-filed for filers in the state.
Illinois state return
Illinois state income-tax return filed alongside your federal one.
Self-employed
Schedule C, self-employment tax and quarterly estimates for Illinois freelancers.
S-corp & LLC
Entity returns and S-corp elections for Illinois business owners.
Foreign-owned
Form 5472, FBAR and FATCA for foreign-owned Illinois businesses.
IRS representation
A licensed EA can represent you before the IRS if a notice arrives.
Illinois businesses, one licensed team
Not a filing mill. A CPA and Enrolled Agent firm that does the work and stands behind it.
A licensed professional prepares and signs, then a second reviews.
If a notice arrives, an Enrolled Agent can represent you directly.
We file both layers together, no handoffs, no gaps.
Filing taxes in Illinois means getting both your federal return and your state obligations right, prepared and signed by a licensed professional who can represent you if the IRS or the state Department of Revenue ever has questions. Illinois charges a $75 annual report fee and a flat 4.95% income tax. Whether you are a resident, an expat filing from abroad, or a business owner facing an IRS notice or audit, here's what filers in the state need to know.
Federal and Illinois state tax filing
Illinois has a state personal income tax (4.95% flat), so you'll typically file a Illinois state return alongside your federal one. Whether you're an individual, a freelancer, an LLC, an S-corp, a C-corp or a foreign-owned business, the return has to reconcile income, deductions and credits correctly, and be filed by the deadline to avoid penalties and interest. We prepare and e-file both layers, and a second licensed professional reviews every line before anything is signed.
Who we file for in Illinois
- Individuals & families. Form 1040 with W-2, 1099, investment, rental and multi-income schedules, and every eligible state and federal deduction applied.
- Self-employed & freelancers. Schedule C, self-employment tax and quarterly estimates, you can size yours with our quarterly tax estimator.
- LLCs & corporations. 1065, 1120 and 1120-S returns, including S-corp owners, test the saving with our S-corp calculator.
- Foreign-owned businesses. Pro-forma 1120 + Form 5472, FBAR and FATCA where they apply.
Sales tax and nexus in Illinois
If you sell goods, Illinois's base sales-tax rate is 6.25%, and you may have a collection obligation if you cross a nexus threshold, in-state or in other states you ship to or store inventory in. Check yours with our sales-tax nexus checker. We register you where you actually owe and fold filing into your bookkeeping.
Why file with a CPA & EA in Illinois?
"Tax preparer" isn't a protected title. A licensed CPA or Enrolled Agent can not only prepare your Illinois and federal returns but also represent you before the IRS if a notice arrives, something a PTIN-only preparer can't fully do. Our tax filing service covers both, year-round, at a flat fee, so the person who files your return in April is the same one who answers the IRS in September.
Four steps.
Then it's handled.
Free consult
Tell us your Illinois situation, entity, income and history.
Send documents securely
Upload through an encrypted portal, we tell you exactly what's needed.
We prepare & review
A CPA or EA prepares it; a second professional reviews every line.
Filed & supported
Federal and Illinois state returns e-filed, with year-round support.
Illinois tax filing questions
Do I need to file a state tax return in Illinois?
Yes, Illinois has a state income tax (4.95% flat), so you generally file a state return alongside your federal one. We prepare both.
Who can file my taxes in Illinois?
A licensed CPA or Enrolled Agent can prepare and sign your Illinois and federal returns and represent you before the IRS. We are a CPA & EA firm, so both are covered.
Can you file Illinois taxes for a foreign-owned business?
Yes. We handle pro-forma 1120 + Form 5472, FBAR and FATCA for foreign-owned Illinois businesses, alongside the standard returns.
What does tax filing in Illinois cost?
We quote a flat fee based on your return's complexity, confirmed in a free consultation, no hourly meter and no surprise add-ons.
Do you handle Illinois sales tax?
Yes. Illinois's base sales-tax rate is 6.25%. We review nexus, register where you owe and file as part of bookkeeping.
Related services
Ready to get started in Illinois?
Get a licensed CPA & EA handling your us tax filing in Illinois, flat fee, no surprises.