Crossing out a mistake on a ballot is almost never the right fix. Optical scanners read the marks you make, so cross-outs, erasures, and correction fluid can cause the machine to misread your intent or throw out that contest entirely. The right move is to get a replacement ballot before the original is scanned. How you do that depends on whether you’re at a polling place, filling out a mail-in ballot, or using an electronic machine.
At the Polls: Ask for a New Ballot
If you’re voting in person and notice you filled in the wrong bubble or made a stray mark, flag down a poll worker before you feed the ballot into the scanner. The poll worker will “spoil” your ballot, marking it unusable and setting it aside so it can never be counted. You’ll get a fresh one to start over. The spoiled ballot is stored separately and logged for the audit trail, but it doesn’t enter the ballot box.
Some jurisdictions cap the number of replacements, but the limit is generous enough that an honest mistake rarely runs into it. The one thing you can’t undo is a ballot the scanner has already accepted. Once it’s through the machine, it’s counted and mixed with the others, and there’s no way to retrieve it.
Modern precinct-count scanners actually help you here. If you accidentally mark two candidates in a race that allows only one, the scanner will typically reject the ballot and alert you. You can then ask a poll worker to spoil it and issue a new one. Central-count scanners used for mail-in ballots don’t give you that real-time feedback, because you’re not standing at the machine when your ballot runs through.
Mail-In or Absentee Ballot: Before You Send It
If you catch the mistake before sealing and mailing your ballot, contact your local election office and request a replacement. Most jurisdictions allow at least one or two. The office will void the original in their system and get you a new one. Replacement requests have their own deadlines, and you still need enough time to complete and return the new ballot before your state’s receipt deadline.
Don’t try to patch a paper mail-in ballot with correction fluid, cross-outs, or erasures. Anything ambiguous can cause the scanner to skip that contest or flag the ballot for manual review.
Mail-In Ballot: After It’s Been Sent
Once your ballot has been received and scanned, a marking error in a specific contest is generally final. Officials count what the scanner reads, and there’s no mechanism to pull the ballot back out and let you redo it.
If you requested a mail-in ballot but haven’t returned it, some states let you show up at your polling place on Election Day and either surrender the blank ballot to vote a fresh one or cast a provisional ballot. Rules vary a lot. Some states let you vote a regular ballot in person as long as the absentee hasn’t been recorded; others won’t issue a new ballot at all once an absentee has been requested. Check with your local election office before assuming you can switch.
Electronic Voting Machines: Use the Review Screen
Touchscreen and other direct-recording electronic machines handle corrections differently, because nothing is physically marked until you finalize your vote. Most systems show a summary or review screen at the end that lists every selection. You can navigate back to any contest and change your choice before hitting the final “cast ballot” button.
Once you confirm and cast on an electronic machine, the selection is locked. There’s no spoiled-ballot equivalent to request. That makes the review screen the most important step of the whole process. Read through every contest before you finalize.
Overvoting vs. Undervoting: What’s Actually at Stake
Two ballot errors get confused, and they have very different consequences.
- An overvote is marking more candidates than allowed in a single contest, such as filling in two bubbles when you can only pick one. It invalidates that contest because the machine can’t determine your intent, so it records no vote for that race. The rest of your ballot still counts.
- An undervote is leaving a contest blank or picking fewer candidates than allowed. It’s perfectly legal. Voters skip races all the time, and it doesn’t affect any other contest.
The takeaway: an overvote costs you that one race, not the entire ballot. Every other correctly marked contest is still counted.
Ballot Curing Won’t Fix a Marking Mistake
Ballot curing sometimes gets mentioned in the same breath as ballot errors, but it addresses a different problem. Curing covers issues with the ballot envelope, most often a missing signature, a signature that doesn’t match your registration, or a missing inner secrecy envelope in states that require one. It does not fix a situation where you marked the wrong candidate.
Roughly 33 states require election officials to notify voters of a curable envelope defect and give them a window to fix it. If you’re contacted about a ballot issue, respond immediately. The deadlines can be tight, and in states without a formal curing process, a ballot rejected for a signature deficiency may simply not be counted.
Where to Confirm Your State’s Rules
Every state runs elections a little differently, so the specifics above will vary depending on where you vote. Your state or county election office is the reliable source. The U.S. Election Assistance Commission maintains a directory with links to every state’s election office, registration tools, absentee voting information, and ballot-tracking options.1U.S. Election Assistance Commission. Register And Vote in Your State
If any part of the process is unclear, call your local election office before Election Day. Poll workers are trained to help with ballot corrections on the spot, but knowing your options ahead of time saves you time and stress when it counts.