Yes, you can run as a write-in candidate in Illinois, but you have to file first. A write-in candidate must file a notarized Declaration of Intent to be a Write-In Candidate (SBE Form P-1F) "no later than 61 days prior to the election" with the proper election authority (2027 Candidate's Guide p. 13; 10 ILCS 5/7-59(b), 17-16.1). For the 2027 elections, that means December 24, 2026 for the February 23 primary and February 4, 2027 for the April 6 consolidated election (2027 Election & Campaign Finance Calendar pp. 8, 30).
Write-in declarations are not filed with the Illinois State Board of Elections (Calendar pp. 8, 30). They go to the election authority for the race. Some candidates are barred from the write-in route, and a winning write-in still has paperwork to finish. The rest of this explainer covers each of those points. ISBE's guides are not legal advice, so confirm the details with your election authority.
For the full picture of running for local office, see our guide on how to run for local office in Illinois.
The key dates for 2027
| Election | Write-in declaration deadline |
|---|---|
| February 23, 2027 primary | December 24, 2026 |
| April 6, 2027 consolidated election | February 4, 2027 |
Both deadlines come from the same rule: no later than 61 days before the election.
There is one earlier date for a special situation. To force a primary for an office that would otherwise be uncontested, a write-in declaration must be filed by December 17, 2026 with the local election official (Guide p. 14; Calendar p. 8). If that is your goal, talk to the local election official well before then.
What you file
The core document is the Declaration of Intent to be a Write-In Candidate, SBE Form P-1F, and it must be notarized (Guide p. 13). There is no petition and no signature requirement for the declaration itself in the sources we rely on.
Where you file it depends on the race. The rule is "the proper election authority" (10 ILCS 5/7-59(b), 17-16.1), and ISBE is clear that it is not ISBE. Call your county clerk or board of election commissioners, describe the office, and ask where the P-1F goes and what hours the office keeps around the deadline. Note that December 24 falls on Christmas Eve, so ask early about office hours that week.
Who cannot run as a write-in
Two groups are barred (Guide pp. 11 to 13; 10 ILCS 5/17-16.1):
- A partisan candidate defeated at the primary or caucus cannot come back as a write-in for that office.
- A nonpartisan candidate defeated at a nonpartisan primary cannot either.
The idea is the same in both cases: losing at the nominating stage closes the write-in door for that election.
If an objection knocks you off the ballot
There is a late path for candidates removed by an objection. If an objection knocks a candidate off the ballot after the 61st day, that candidate may file a write-in declaration up to 7 days before the election (Guide p. 13; 10 ILCS 5/17-16.1).
This matters on the April 6 track, where objections are due December 1 or 2, 2026 and electoral boards decide them in the weeks after, with court review possible after that. A candidate who is removed late in that process is not necessarily out of the race. Our post on running as an independent in Illinois explains why that matters especially for independents, who have no party to fill a vacancy.
If you win
A write-in who wins must then file a Statement of Candidacy and a receipt for a Statement of Economic Interests (Guide p. 14). Ask the election authority where you filed the P-1F when and where those are due, and file them promptly.
Questions to ask your election authority
The sources we rely on set the filing rules above. They do not cover how write-in votes are cast and counted in your jurisdiction, and those details matter to how you campaign. Ask your election authority:
- Where do I file the P-1F for this office, and what are your hours near the deadline?
- How do voters cast a write-in vote on your ballots and voting equipment?
- How are write-in votes for a declared candidate counted and reported?
- If I win, when and where do I file my Statement of Candidacy and SEI receipt?
Write the answers down, and use their exact words when you tell supporters how to vote for you.
Why write-in campaigns depend on reminders
A candidate printed on the ballot is in front of every voter who opens it. A write-in candidate is not. Every vote depends on the voter remembering your name and how to write it in, at the moment they are filling out the ballot. That makes a write-in campaign, more than most, a campaign of reminders: when early voting opens, what the voter needs to do, and the exact spelling of your name.
Early voting starts January 14, 2027 for the February 23 races and February 25 (or March 12 where a February primary ran) for the April 6 races. Your reminders need to arrive before those dates, not just before election day.
Sending those reminders by text
Text reminders fit a write-in campaign well, as long as you send them only to people who have agreed to hear from you. A petition sheet or sign-in sheet counts as consent to receive texts only if it says so plainly and the date is recorded, so build your list the honest way: ask at the door, at events and on your website. Never assume you can text a whole voter list.
Schedule your reminders around the voting dates. In CampaignCNX+, you text your opted-in supporters from your campaign number and handle the replies in a two-way inbox, so a voter who asks "how exactly do I write you in?" gets a real answer from your team. Quiet-hours scheduling keeps reminders out of early mornings and late nights, and STOP replies are handled automatically. CampaignCNX+ files your carrier registration (10DLC or toll-free) for you and guides you through Campaign Verify.
That last step needs planning. Campaign Verify is required for political texting on registered numbers, and it needs an EIN and a published election-authority filing; candidates with no committee are not eligible. A candidate who has not formed a political committee does not yet have that filing. Our post on Campaign Verify for local candidates covers what it costs and how long it takes, so you can line it up before your first reminder.
A reminder to an opted-in supporter, using the instructions your election authority gave you, might read:
"Hi, it's Sam Rivera for Park Board. Early voting opens Feb 25. To vote for me, write in SAM RIVERA as the election office directs. Reply STOP to opt out"
FAQ
Do I need signatures to run as a write-in in Illinois? The declaration (Form P-1F) is notarized and filed by the deadline; the sources we rely on do not list a signature requirement for it. Confirm with your election authority.
Where do I file? With the proper election authority for the race, not with ISBE.
What is the deadline? No later than 61 days before the election: December 24, 2026 for February 23, and February 4, 2027 for April 6.
I lost the primary. Can I run as a write-in in the general? Not for the same election. A partisan candidate defeated at the primary or caucus, and a nonpartisan candidate defeated at a nonpartisan primary, are barred.
What if I was removed by an objection? If it happens after the 61st day, you may file a write-in declaration up to 7 days before the election.
Get your reminders ready
A write-in race is won one reminder at a time. To start, 100 free SMS included. Your number is $5 a month. See CampaignCNX+ for Illinois campaigns, or start your CampaignCNX+ account.