Voter fraud claims are widespread — I'll check the latest evidence on how often it actually happens.
In the United States voter fraud exists, but extensive research, audits and court reviews have found it is extremely rare and not at a scale that affects national election outcomes.
What the data shows
Studies across partisan and nonpartisan sources converge on very low rates:
•Overall rate is microscopic. Scholars conclude instances of voter fraud are extremely uncommon relative to hundreds of millions of ballots cast. Documented rates are typically measured in the hundred-thousandths to millionths of a percent, with common cited figures like 0.0000845% (Arizona sample), ~0.000039% (Pennsylvania).
•Brennan Center for Justice: Impersonation fraud rates are between 0.0003% and 0.0025%. One Brennan-cited review of 84 million votes in 22 states yielded 14 instances referred for prosecution — an implied rate on the order of 0.00000017% in that sample.
•Heritage Foundation Database: The conservative Heritage Foundation's Election Fraud Database, which catalogs proven instances that led to prosecutions, shows approximately 1,400 proven cases across decades and billions of ballots. Other syntheses of the same database cite 1,546 instances since 1982 and that it identified only 192 instances since 2020. Heritage itself acknowledges the database is not comprehensive.
•Associated Press (2020): 475 potential cases out of 25 million votes in 2020.
•Mail-ballot fraud: A 20-year MIT analysis estimated mail-ballot fraud around 0.00006% of votes nationwide. A 2025 Brookings analysis of national mail-voting data found fraud rates around 0.000043% (about four cases per 10 million ballots).
•Dead voters: Researchers analyzed 4.5 million voter records (2011–2018) in Washington state and found 14 ballots (0.0003%) that might have been cast after the voter's death, likely due to name collisions or clerical errors, not fraud.
The takeaway in most reviews is: Fraud occurs, but at a scale far too small to alter national outcomes.
Types of fraud that do occur
The U.S. government defines voter or ballot fraud as one of three broad categories of federal election crimes. Common types include:
•Voter impersonation: Appearing at a polling place and casting a ballot in the name of another registered voter, the form most commonly cited for voter ID laws, and also the form research consistently finds to be vanishingly rare. One Loyola Law School review identified only 31 credible incidents of in-person impersonation out of more than one billion ballots cast.
•Double voting or voting in two jurisdictions, voting in the name of a deceased person, noncitizen voting, mail-in/absentee ballot fraud, providing false information when registering, and ballot stuffing or tampering by officials.
Isolated incidents have been prosecuted, including ballot tampering by a political operative in North Carolina's 9th District in 2018 and mail-in ballot manipulation charges in Paterson, N.J. in 2020. Each case was investigated, prosecuted and corrected, which is described as evidence of accountability, not systemic failure.
What election security reviews found
•The Cybersecurity and Infrastructure Security Agency (CISA) declared the 2020 contest "the most secure in American history," noting there was no evidence that voting systems deleted or lost votes, changed votes, or were compromised in any way.
•CISA has consistently stated it found no evidence of foreign interference that altered the outcomes of the 2020 or 2024 presidential elections.
•Numerous court decisions, state election officials, federal agencies and independent reviews have found no evidence of widespread fraud capable of changing the election outcome. By 2020, roughly 95–98% of votes were cast on paper, enabling hand recounts and risk-limiting audits that confirmed machine tallies, such as Georgia's statewide hand recount in 2020.
Why the perception of a major problem persists
•Former President Donald Trump and allies have alleged "MASSIVE VOTER FRAUD," focusing especially on mail ballots and voting machines, and in October 2026 offered a $1 million reward for reports leading to convictions.
•Research on propaganda and disinformation notes that both left- and right-leaning citizens are susceptible to claims that elections are "rigged", and that foreign disinformation campaigns explicitly aim to erode confidence by amplifying narratives that mail voting is inherently corrupt.
•The conservative Heritage Foundation and other groups document cases to support stricter voting laws, while academic researchers emphasize the rarity to oppose claims of systemic rigging. Brookings' synthesis of Heritage data still produced very small percentages and found documented cases did not change election outcomes in the data examined.
Safeguards in place
State and federal systems include signature verification, ballot tracking, chain-of-custody logs, bipartisan poll-worker teams, pre-election logic and accuracy testing, post-election risk-limiting audits, and federal cybersecurity partnerships through CISA and the Election Assistance Commission.
Bottom line
•Voter fraud is real but rare — on the order of a few cases per million ballots.
•No audit, court case, or federal security review has found evidence of widespread, outcome-changing fraud in recent presidential elections.
•The greatest vulnerabilities identified by DHS and researchers are not large-scale ballot fraud, but misinformation, underfunded infrastructure, and harassment of election workers, while legitimate elections are described as more secure and auditable than a decade ago.
Whether that rare level constitutes a "problem" is often a political judgment: supporters of stricter voting rules argue any fraud undermines confidence and justifies ID laws and tighter list maintenance, while election administrators and most researchers argue the data does not support claims of rampant or systemic fraud.