Chicago residents have several official deadlines between October 12 and October 31, 2026, but they do not all work the same way. Some are filing deadlines, some are receipt deadlines, and some are application cutoffs where starting the process is not enough. The most important practical rule is to identify what the agency must have in hand by the stated date and to keep proof that you completed the required step.
This guide includes only dates that were confirmed on current federal, Illinois, Chicago, Cook County or regional government sources as of October 3, 2026. It does not include dates that fall outside October 12–31, deadlines that depend entirely on an individual notice, or program openings whose actual cutoff comes later.
| Date | Who needs to act | What must happen | Deadline type |
|---|---|---|---|
| October 13 | Employees who received at least $20 in tips during September | Report September tips to the employer | Reporting deadline |
| October 14 | Employees appointed to serve as election judges | Give the employer written notice of Election Day absence | Notice deadline |
| October 15 | Individuals with a valid six-month federal filing extension | File the 2025 federal income tax return | Filing deadline |
| October 15 | Illinois calendar-year individual filers using the automatic extension | File the 2025 Illinois Form IL-1040 | Filing deadline |
| October 18 | Eligible Illinois voters who want to use online voter registration | Complete online voter registration | Registration deadline |
| October 26 | Certain military and overseas voters tied to Chicago | Submit the applicable vote-by-mail or federal-only ballot application | Application receipt deadline |
| October 26, 4 p.m. CT | People wishing to comment on the current Cook County planning notice | Submit written public comments so they are received by the deadline | Public-comment receipt deadline |
| October 29 | Registered voters in the United States who want a mail ballot for the November 3 election | Ensure the election authority receives the vote-by-mail application | Application receipt deadline |
| October 31 | Chicago-area riders who want to apply for a NITA rider advisory council | Submit the council application | Application deadline |
Yes, for a specific group. The IRS 2026 tax calendar says an employee who received $20 or more in tips during September must report those tips to the employer by October 13. This is not the date when the employee files an annual income tax return, and it is not a separate payment deadline to the IRS. It is a reporting obligation to the employer.
The official source is the IRS 2026 Publication 509 tax calendar.
Use the reporting method your employer requires and retain a record showing what you reported and when. The useful completion signal is not that you calculated the tips; it is that the report was actually delivered through the employer’s accepted process.
Employees who have been appointed to serve as election judges for the November 3, 2026 General Election should check the October 14 notice deadline. Illinois election calendars identify October 14 as the last day for an employee appointed as an election judge to give the employer written notice that the employee will be absent from work on Election Day because of that appointment.
This is an employer-notice deadline, not a voter-registration deadline and not the date of election-judge service. The election itself is November 3. Residents serving in Chicago should use the Chicago Board of Elections 2026 Election Calendar for the city-specific calendar.
If you obtained the automatic six-month extension for your 2025 federal individual income tax return, October 15, 2026 is the filing deadline for Form 1040 or Form 1040-SR. The IRS calendar specifically identifies October 15 for individuals with that extension.
The most important distinction is between filing and payment. A filing extension did not extend the normal deadline to pay 2025 federal income tax. If you still owe tax, October 15 is not a new interest-free payment date. The IRS states that the extended filer should file and pay any tax, interest and penalties due. See the IRS 2026 tax calendar.
For an electronically filed return, save the filing confirmation or acceptance record. If you mail a return, follow the IRS mailing instructions applicable to your return and keep documentation of timely mailing. Do not treat “tax software says the return is ready” as completion.
Yes. The Illinois Department of Revenue says the extended due date for a calendar-year 2025 Form IL-1040 is October 15, 2026. Illinois grants an automatic six-month extension to file, but the state explicitly says that the extension does not extend the time to pay tax owed. For calendar-year filers, payment was due April 15, 2026.
That means someone who still has an unpaid Illinois balance should not read October 15 as a new payment grace period. The October date is primarily the extended filing deadline. The official instructions are on the Illinois Department of Revenue Form IL-1040 general-information page.
For the November 3, 2026 General Election, the Illinois State Board of Elections calendar lists October 18 as the online voter-registration deadline. Illinois law closes online registration on the 16th day before the election.
If you miss this online deadline, that does not necessarily mean you have lost the ability to register. Illinois provides grace-period registration and voting after the regular registration period closes. The process is in person and is different from the online system. Use the Illinois State Board of Elections 2026 election calendar and the Illinois voter-registration information page to check the current procedure.
Do not stop after entering information into a form. Make sure the online submission reaches the confirmation stage, then use the state or Chicago election authority’s voter-status tools to verify your registration information. Processing by the election authority may occur after submission; the October 18 date is the online submission cutoff, not a promise that every record is fully processed at that exact moment.
Chicago’s 2026 election calendar places several military and overseas voting deadlines on October 26. These include certain members of the U.S. services and eligible family members who expect to be absent from their county of residence on Election Day, as well as specified overseas or nonresident civilian voters seeking ballots under Illinois’ military and overseas voting rules.
For some unregistered U.S. citizens temporarily outside the United States who apply late in the pre-election period, the available ballot may contain federal offices only. Because eligibility differs by status and residence history, this is a deadline where the exact category matters. The authoritative city source is the Chicago Board of Elections 2026 Election Calendar.
If this category applies to you, treat October 26 as a receipt deadline for the applicable application, not merely the day to begin preparing it.
Yes, for residents or other interested parties who want their written comments considered in the currently posted Cook County Bureau of Economic Development planning process. The County’s notice lists a public-comment period ending October 26, 2026 and states that written comments must be received by 4 p.m. Central Time on the final day to receive consideration.
This is voluntary civic participation, not an application for cash benefits. If you want your comment included in the formal process, the relevant result is that the County receives it by the stated time. Current instructions are posted on the Cook County Bureau of Economic Development public-notices page.
For the November 3, 2026 General Election, the Illinois State Board of Elections says all requests by mail for a vote-by-mail ballot must be received by the election authority by October 29, 2026. This applies to the standard vote-by-mail process for registered voters; special rules apply to military and overseas voters.
The key word is “received.” October 29 is not simply a postmark date for the application. If you wait until the last day to place a request in the mail, it may arrive too late. The official statewide source is the Illinois State Board of Elections Voting by Mail page.
No. It is the deadline for the election authority to receive the application for a mail ballot. Ballot-return rules are separate. This distinction matters because a voter could submit a valid request by October 29 but still have another required step: receiving, completing and returning the actual ballot according to the election rules.
The Northern Illinois Transit Authority says applications for its new Riders Advisory Council and ADA Advisory Council are open through October 31, 2026. NITA is seeking riders from Cook County, the collar counties and the City of Chicago. The ADA Advisory Council is intended to bring the perspectives of riders with disabilities into transit policy and service discussions.
The councils are volunteer bodies, and NITA says it plans to identify members in early 2027. That is an important processing distinction: October 31 is the application deadline, while selection happens later. Details are on the official NITA Rider Advisory Councils announcement.
Start with obligations that can create penalties or loss of a procedural option if missed. That usually means tax filing first, then any voter-registration or ballot-request deadline that applies to you. Next, handle notices tied to a role you already accepted, such as election-judge service. Optional public-comment and advisory-council applications can follow if they are relevant to your interests.
A useful deadline checklist has three columns: what must be submitted, who must receive it, and what confirmation proves completion. For a tax return, that may be an electronic acceptance notice. For online voter registration, it may be a submission confirmation plus a later registration-status check. For a vote-by-mail request, the controlling issue is receipt by the election authority. For a public-comment submission, save the sent message or portal confirmation and make sure it was transmitted before the stated cutoff.
This list deliberately excludes dates outside October 12–31, 2026 and deadlines that are not universal or cannot be verified from a current official source. For example, Cook County’s Tax Year 2025 second-installment property-tax due date was October 1, so it falls outside this guide’s date window. It also excludes open-enrollment programs whose October date is only a start date and whose actual enrollment deadline comes later.
Government agencies can amend calendars, especially election procedures and public notices. If your action is consequential, check the linked official page again immediately before submitting rather than relying on a saved screenshot or an older calendar copy.
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