Tax Account Setups
including Sales Tax Registration

Timing

2–5 business days (online) or 2–3 weeks (mail)

If You Do It Yourself

Free

Delivery

Tax ID Number (Account ID) and login details emailed upon approval.

Eligibility

All businesses that sell taxable goods or services, hire employees, or collect use tax. Out-of-state (foreign) businesses with customers or inventory in Illinois must register as remote sellers. No residency or visa requirements apply — foreign owners can register through a valid FEIN.

Every business operating in Illinois must register for the appropriate state and local tax accounts before collecting sales tax, paying employees, or filing business returns. This includes Sales Tax, Use Tax, Withholding Tax, and other specialized tax registrations with the Illinois Department of Revenue (IDOR).

Book a Consultation

Have a Question? Email Me

The consultation fee is applied toward your total service fee if you proceed with the services.

If the consultation is the only service provided, the fee remains non-refundable, as professional time, analysis, and guidance are delivered during the session.

or contact me:

DIY Step-by-Step Guide
(No agent or lawyer)
As an example, in Illinois

Determine Your Filing Type

Corporations must file Form IL-1120 (Corporation Income and Replacement Tax Return)

LLCs taxed as corporations use the same form

LLCs taxed as partnerships or disregarded entities may need Form IL-1065 or IL-1040 (Schedule NR)

Cost: Free — the Illinois Department of Revenue does not charge a filing fee, but taxes owed must be paid

Access Official Filing Portals

Illinois MyTax Portal
https://mytax.illinois.gov

IRS (for federal return reference)
https://www.irs.gov/businesses

Gather Required Data

Business name, FEIN, and Illinois file number

Prior year’s taxable income or loss

Current-year income, deductions, and credits

Authorized and issued capital stock (for corporations)

Payment method for franchise tax due (ACH debit or credit card)

Complete the Filing Process

Log into the MyTax Illinois portal

Choose the correct filing form (IL-1120, IL-1065, or IL-1040)

Fill out all required sections carefully, ensuring figures match your financial statements

Attach supporting schedules if requested (balance sheet, statement of income)

Submit your return and make payment online

Note: If your total tax liability exceeds $400, quarterly estimated payments may be required.

Mail-In Option
(if preferred)

Download the correct form from the Illinois Department of Revenue
https://www2.illinois.gov/rev/forms

Complete, sign, and mail it with payment to:
Illinois Department of Revenue
P.O. Box 19031
Springfield, IL 62794-9031
‍
Processing time: 2–4 weeks.
Cost: Free (postage and payment fees apply).

Receive Confirmation

You’ll receive a filing acknowledgment and payment confirmation from the Department of Revenue.

Keep this for your records — it may be required for annual report renewal or Certificate of Good Standing.

Common Mistakes People Make

Registering before your LLC or Corporation is approved by the Secretary of State.

Providing incorrect business activity codes (NAICS classification).

Failing to include a valid FEIN, causing registration rejection.

Forgetting to register for Withholding Tax if hiring employees.

Not updating your account when expanding to new business locations.

Documents & Information Needed

Thank you! Your submission has been received!