As described in our most recent blog post, lawfare is ongoing in Pennsylvania that seeks to nullify a rule in state election law that undated or misdated mail-in ballots “shall not be counted.” This simple requirement is facing both federal and state court challenges that are yet to be resolved.
An initial motivating factor behind the opposition to this rule was the belief that many thousands of votes had been tossed during the 2022 general election because of it, thereby “disenfranchising” the affected voters. This belief has been reflected in an oft-repeated claim that during this election, upwards of 10,000 mail-in ballots were rejected for failure to be properly dated.
For example, a press release from the ACLU from about a year ago contained the following snippet: 1
“In Pennsylvania, thousands of voters have their mail-in ballots rejected each year solely because of a common trivial mistake: writing an incorrect date, or no date at all, on their ballot envelope…officials do not use the date to determine whether the ballot was returned on time … and the date is not used to determine voter eligibility. Nonetheless, this essentially meaningless requirement caused the rejection of at least 10,000 ballots from voters who had submitted their mail-in ballots on time in the 2022 general election.”
Judge Baxter (U.S. District Court for the Western District of Pennsylvania) herself cited this claim in her Memorandum Opinion explaining her March 2025 decision which sided with the plaintiffs on their amended complaint, striking down the rule:2
“Under current practice, if the date on the outer envelope is incorrect or missing, the ballot is not counted. It is undisputed that in the 2022 general election, over 10,000 mail ballots were disqualified for this reason.”
As the judge makes clear, the “over 10,000” figure has gone undisputed within the contours of the legal proceedings that have taken place to date. But the origin of this statistic is quite murky, and there is good reason to believe it is a significant overstatement.
This blog post seeks to set the record straight in this regard. Additionally, the post presents a rigorous analysis of data from the 2024 general election in Pennsylvania to quantify the effect of ballots being cancelled due to a missing or invalid date. The analysis finds that 2,055 individuals ended up not voting for that reason, corresponding to just one-tenth of one percent of all returned mail ballots in that election.
Hidden in plain sight: an official count much less than 10,000
Within eight weeks after the 2022 general election, state officials announced that the total number of ballots rejected due to a missing signature; a missing or improper date; or some combination thereof was just under 8,000, per Associated Press reporting: 3
“The Department of State said this week more than 16,000 mail-in ballots were disqualified by county officials because they lacked secrecy envelopes or proper signatures or dates … The agency said 8,250 Pennsylvania mail-in ballots were rejected because they were sent in without being contained within a secrecy envelope, making it impossible for them to be tabulated without putting voter privacy at risk … The remaining 7,904 invalidated ballots were tossed out because the exterior envelopes used to send in those ballots did not have the voters’ signatures, or because those exterior envelopes were either undated or improperly dated.”
Common sense dictates that many of those nearly 8,000 rejected ballots were tossed primarily because of lacking a signature, most likely along with missing a date. The precise number of ballots rejected solely because of a missing or improper date is unknown. Undoubtedly, though, this number would have been substantially less than 8,000.
Moreover, a rejected mail ballot does not necessarily become a lost vote; for instance, the voter may proceed to cast a provisional ballot at the polls on election day. The analysis later in this post will clearly demonstrate this point.
Regardless of how the claim of “more than 10,000 rejected ballots” came about, it is devoid of credibility. Considering both its murky origin and that it is straight-out contradicted by the official figure cited in the Associated Press report, it is an unwelcome imposter and should be ejected from the proceedings.
How many lost ballots in the 2024 General Election?
In a response brief to the defendants’ filing of an appeal of Judge Baxter’s decision in the U.S. 3rd Circuit Court of Appeals, the plaintiffs reiterated their belief that “thousands” of votes continue to be lost “due to the date requirement. Specifically, they declare that about 4,500 votes were lost in the 2024 general election due to missing or incorrect dates, seen as insufficient progress:4
“… before the 2024 election, the Secretary of the Commonwealth redesigned the mail ballot declaration in an effort to reduce widespread errors… in any event, the 2024 election results show that the date requirement has continued to disenfranchise voters by the thousands, even after this redesign. Despite the Secretary’s best efforts to reduce errors, approximately 4,500 eligible Pennsylvania voters had their ballots tossed out for missing or incorrect dates.”
The source cited is a January, 2025 official state press release summarizing what became of the 2.2 million approved mail-in and absentee ballot applications had been distributed to Pennsylvania voters for the November 2024 election, including the following details: 5
- The distributed mail ballots had an 89 percent return rate
- The returned ballots had a 1 percent overall rejection rate
- Of the rejected ballots, 23 percent were tossed due to missing or invalid date
Carrying out the requisite calculations implies 1,958,000 returned ballots of which 19,580 were rejected (based on the first two facts).6 In turn, this implies (based on the third fact) that 4,500 ballots were rejected because of the date rule.
Not so fast, please!
But how accurate is the count of 4,500 lost votes due to the date requirement? Not very, as will shortly be demonstrated.
The count apparently is based on a simplistic calculation using a database maintained by the state’s Bureau of Elections known as the Statewide Mail Ballot (SwMB) file.7 This calculation ignores several important details:
- This count pertains to rejected ballots, not rejected voters—the same voter may have more than one mail ballot recorded, which may include replacements for rejected ballots
- This count combines ballots recorded as cancelled with those last recorded as pending (which, presumably, the voter had been given a chance to cure)
- Ultimately, many of the cancelled or pending ballots did not result in lost votes, because the voter either cured the ballot or cast a provisional ballot on election day
Table 1 presents summary information from the file on the status of mail ballots that were distributed but have not been recorded as votes as of 11/22/2024, including a breakdown of the reasons they remain unrecorded. The total number of ballots cancelled or pending due to mistakes or lapses on the part of the voter (19,334) in Table 1 is a close match to the number calculated above. The total number of ballots cancelled or pending due to missing or incorrect dates is 4,330, which is close to the count of 4,500 calculated above. Thus, Table 1 within reasonable approximation appears to replicate the information reported in the January press release.8
Table 1: Unrecorded ballots by reason for current status
| Cancelled | Pending | Combined | Percent of Total | |
| Incorrect date | 1,969 | 440 | 2,409 | 12.5% |
| No date | 1,556 | 365 | 1,921 | 9.9% |
| No ID | 312 | 1,291 | 1,603 | 8.3% |
| No secrecy envelope | 2,316 | 528 | 2,844 | 14.7% |
| No signature | 2,480 | 1,008 | 3,488 | 18.0% |
| Other | 882 | 60 | 942 | 4.9% |
| Returned after deadline | 6,124 | 0 | 6,124 | 31.7% |
| Challenged | 3 | 0 | 3 | 0.0% |
| TOTAL | 15,642 | 3,692 | 19,334 | 100.0% |
| Not yet returned | 0 | 211,353 | 211,353 |
Table 1 highlights a key distinction in the data—between cancelled and pending ballots. Cancelled ballots are indeed rejected—withdrawn for violating a requirement, plain and simple. Pending ballots are those for which consideration has been deferred, presumably awaiting remediation from voters who had been granted an opportunity to cure.
The table indicates that 805 out of the total 4,330 ballots that had gone unrecorded due to the date requirement were not outright rejected—the ballots are tagged as pending, implying an opportunity to cure. In the case of these pending ballots, the voters bear at least part of the responsibility for their vote ultimately not being recorded, as they have not availed themselves of that opportunity.
As noted above, another significant complication in regard to interpreting Table 1 is the presence in the underlying data of more than one ballot per voter. In particular, some voters with a cancelled ballot are identified with another ballot that served as a replacement for the rejected ballot.
Therefore, the raw count of cancelled due to a missing or invalid date may overstate the number of votes lost due solely to the violation. If a replacement for the cancelled ballot had been supplied to the voter, then the final outcome depends on whether the voter returned the replacement ballot.
Table 2 summarizes the distribution of ballots per voter within the subpopulation of voters for whom at least one ballot had a missing or incorrect date. Most voters, totaling 3,503, have only a single observed ballot, of which 2,714 are cancelled and 789 are pending. Another 826 voters within this subpopulation have two or more ballots observed in the database.
The total number of voters within this population is 4,329, one less than the total number of ballots with missing or incorrect dates. The difference is due to the fact that one voter had a repeat violation of the date requirement, after being supplied with a replacement ballot.
Table 2: Ballot count distribution for the subpopulation of interest
| Ballots per voter | Voter count |
| 1 | 3,503 |
| 1 —cancelled | 2,714 |
| 1—pending | 789 |
| 2 | 770 |
| 3 | 53 |
| 4 | 3 |
| All | 4,329 |
The 2,714 voters whose sole mail ballot had been cancelled had no replacement ballot accorded to them. After cancellation, their sole option would be to vote by provisional ballot at a polling place.
Whether they exercised that option can be determined from their recorded voting histories in the state’s Full Voter Export (FVE) database, by matching their unique voter id numbers across the two databases. It can likewise be determined whether the 789 voters whose sole mail ballot was left pending decided to cast a provisional ballot.
Table 3 summarizes the results from carrying out this analysis. More than a quarter of the voters whose sole ballot had been cancelled due to missing or invalid date recorded in the FVE database as having voted. This leaves 2,020 not voting as a consequence of the ballot rejection. Among those whose sole ballot was pending due to missing or invalid date, nearly 30 percent are indicated as having voted, leaving 559 in pending status.9
Table 3: Final outcomes—voters with a single cancelled or pending mail ballot
| Status Reason | Non-voted | Voted | Total | Percent voted |
| Cancelled – incorrect date | 1,075 | 390 | 1,465 | 26.6% |
| Cancelled – no date | 945 | 304 | 1,249 | 24.3% |
| Cancelled – total | 2,020 | 694 | 2,714 | 25.6% |
| Pending – incorrect date | 310 | 118 | 428 | 27.6% |
| Pending – no date | 249 | 112 | 361 | 31.0% |
| Pending – total | 559 | 230 | 789 | 29.2% |
It remains to ascertain the final outcomes for voters with two or more observed ballots in the SwMB file. Again, this is accomplished by matching to their recorded voting histories in the FVE database.
Table 4 summarizes the results from carrying out this analysis. About 4 of 5 voters in this population (672 out of the total 826) were recorded in the FVE data as having voted. Most of these individuals also had a returned and recorded mail ballot indicated as their final status in the SwMB file.10
There are only 54 voters in this population who had an undated or misdated cancelled ballot as their final status in the SwMB file, of whom 35 had no recorded vote. Adding these 35 to the 2,020 whose sole mail ballot had been canceled due to a missing or invalid date, and who had no recorded vote, yields a total of 2,055 not voting due to their ballot being cancelled for that reason. The corresponding “rejection rate”, relative to the statewide total number of returned mail ballots, is just one-tenth of one percent.
The second largest category of voters listed in Table 4 are those whose final status is pending due to an unreturned ballot, implying that these individuals were supplied with a replacement for their undated or misdated ballot but had not returned it. More than half of these voters are recorded in the FVE data as having voted.
In total (combining unreturned with pending undated or misdated), 254 voters in this population had pending as their final status in the SwMB file, of whom 113 had no recorded vote. Adding these 113 to the 559 whose sole mail ballot remained pending and who had no recorded vote, yields a total of 662 voters left with a pending ballot and no recorded vote. It bears repeating that these voters bear at least part of the responsibility for having no recorded vote, to the extent they did not avail themselves of an opportunity to cure their flawed mail ballot.
Table 4: Final outcomes—voters with two or more observed mail ballots
| Last status in SwMB File | Record in FVE File | Count | Percent |
| Pending — Unreturned | Vote Recorded | 139 | 56.0% |
| No vote / unknown | 109 | 44.0% | |
| Pending — Undated or Misdated | Vote Recorded | 2 | 33.3% |
| No vote / unknown | 4 | 66.7% | |
| Cancelled — Undated or Misdated | Vote Recorded | 19 | 35.2% |
| No vote / unknown | 35 | 64.8% | |
| Cancelled — Other | Vote Recorded | 0 | 0.0% |
| No vote / unknown | 5 | 100.0% | |
| Ballot Returned — Vote Recorded | Vote Recorded | 512 | 99.8% |
| No vote / unknown | 1 | 0.2% | |
| All | Vote Recorded | 672 | 81.4% |
| No vote / unknown | 154 | 18.6% | |
| Total | 826 |
Concluding remarks
Pennsylvania election law requires in no uncertain terms that undated or misdated mail-in ballots “shall not be counted.” This simple requirement is facing federal and state court challenges, motivated in part by a claim that during the 2022 general election, upwards of 10,000 mail-in ballots were rejected for failure to be properly dated.
The origin of this claim is unclear, and though the claim is often repeated, it has no credibility. It is straight-out contradicted by an announcement from the Pennsylvania Department of State in January, 2023, reported by the Associated Press, stating that the number of ballots rejected due to date and signature requirements combined was no more than 8,000.
More recently, opponents of the date requirement have asserted that 4,500 individuals were deprived of their vote during the 2024 general election on account of a missing or invalid date. However, a rigorous analysis of data from the 2024 general election in Pennsylvania indicates that fewer than half that number, 2,055 individual, ended up not voting due to their ballot being cancelled for that reason. That corresponds to just one-tenth of one percent of all returned mail ballots in that election.
An additional 662 voters who had submitted a ballot with a missing or invalid date ultimately were left with a pending ballot and no recorded vote in that election. Arguably, these voters bear at least part of the responsibility for having no recorded vote, to the extent they did not avail themselves of an opportunity to cure their flawed mail ballot.
As a final thought, consider that failure to take note of the date rule or to fill in the correct date can be viewed as a manifestation of the sorts of cognitive limitations we all are subject to. Everyone is more or less prone to forgetfulness, inattention, oversight, miscalculation, and various behavioral biases such as procrastination, making it inevitable that the rule would cause slip-ups. For the hapless 2,055 individuals that lost their vote in 2024, the rule might seem to be the brainchild of a noodge.11
But could it then be the case that, also because of cognitive limitations, for another small percentage of mail-in voters the date requirement might actually be helpful? Could it perhaps be the nudge that leads them to submit their ballot on time? Recalling and writing down the calendar date when completing a mail ballot may well serve as a memory or attention booster, prodding the voter to bring the ballot to a mailbox or drop box promptly, thus precluding a missed return deadline.
This is not mere random speculation. The concept of nudges as mitigants to cognitive limitations has a strong foundation in behavioral economics and the behavioral sciences more generally.12 Moreover, many more mail ballots were disqualified in the 2024 general election because of missing the return deadline than for having missing or invalid dates. Thus, this hypothetical tradeoff may well be worthy of serious consideration in evaluating the merits of the original complaint.
- See “Advocates for voters sue Pennsylvania for rejecting thousands of mail-in ballots due to inconsequential handwritten date mistakes”, May 28, 2024 (link) ↩︎
- See Memorandum Opinion, signed by Judge Susan Paradise Baxter on 3/31/2025. Cases.justia.com, pages 5-6 (link) ↩︎
- See Mark Scolford, “Majority of 16k cancelled Pa. mail-in ballots were from Dems”, Associated Press, January 6, 2023 (link). ↩︎
- See “Brief of Plaintiffs-Appellees Bette Eakin, DSCC, DCCC, AND AFT Pennsylvania”, United States Court of Appeals for the Third Circuit, Case 25-1644 Document 90, Filed 06/04/2025, at page 9 (link). ↩︎
- See “Shapiro Administration Announces 57% Decrease in Mail Ballots Rejected in 2024 General Election”, Pennsylvania Department of State, January 24, 2025 (link). ↩︎
- These counts closely align with data published by the U.S. Election Assistance Commission which indicate 1,933,102 returned ballots and 19,270 rejected ballots for the 2024 general election in Pennsylvania. See Election Administration and Voting Survey 2024 Comprehensive Report, U.S. Election Assistance Commission, June 2025, Chapter 1 Appendix A, Overview Table 1, pages 34-37 (link). ↩︎
- This file contains point-in-time detailed data pertaining to the processing of absentee and mail-in ballots. It is refreshed daily and made available to the public for informational purposes during the course of an election. ↩︎
- The count of pending and cancelled attributed to missing or incorrect dates corresponds to 22.4 percent of total cancelled or pending in Table 1. This is close to but falls short of the reported 23 percent in the January press release, likely reflecting updates or corrections made to the data during the interim period. ↩︎
- To be more precise, 10 percent of the voters in this population who were recorded in the FVE data as having voted were indicated to have voted by mail, indicating that the SwMB file did not have the updated status for their mail ballots. ↩︎
- A single voter in the SwMB file is indicated to have returned a ballot and recorded a vote, but was not found in the FVE file, presumably due to no longer being registered in Pennsylvania as of 1-20-2025. ↩︎
- The colloquial term noodge derives from Yiddish and typically refers to an annoying or pestering person. ↩︎
- The term nudge in such contexts refers to a subtle intervention to influence individuals to make wiser decisions, countering behavioral biases or limitations on the ability to process information. See, for example, John Beshears and Harry Kosowsky, “Nudging: Progress to Date and Future Directions”, Organizational Behavior and Human Decision Processes Volume 161, Supplement, November 2020, Pages 3-19. https://pmc.ncbi.nlm.nih.gov/articles/PMC7946162/ ↩︎




