I'll gather current research and data to assess how common voter fraud is in U.S. elections.
Short answer: According to academic research, court findings, and federal government investigations, voter fraud exists but is vanishingly rare in the United States — not at a scale that would affect national election outcomes.
1. What the research consensus shows
•The body of research — from academic peer-reviewed studies, government investigations, and court records — consistently finds that in-person voter fraud, voter impersonation, and non-citizen voting occur at rates so low as to be statistically negligible, and that no documented instance of fraud has ever changed the outcome of a U.S. election
•The weight of rigorous academic studies, major news investigations, and official reviews converge: voter fraud exists but is vanishingly rare in absolute and relative terms — orders of magnitude below levels that would flip national elections
•Sensationalist claims aside, "fraud by voters at the polls is vanishingly rare, and does not happen on a scale even close to that necessary to 'rig' an election"
2. How rare is "rare"? The numbers
Researchers measure proven fraud as a tiny fraction of votes cast:
•The Brennan Center's seminal report The Truth About Voter Fraud found that most reported incidents of voter fraud are actually traceable to other sources, such as clerical errors or bad data matching practices. The report reviewed elections that had been meticulously studied for voter fraud, and found incident rates between 0.0003 percent and 0.0025 percent. The report noted it is more likely an American "will be struck by lightning than that he will impersonate another voter at the polls."
•A comprehensive 2014 study published in The Washington Post found 31 credible instances of impersonation fraud from 2000 to 2014, out of more than 1 billion ballots cast
•Two studies done at Arizona State University found similarly negligible rates. The project found 10 cases of voter impersonation fraud nationwide from 2000–2012 and zero successful prosecutions for impersonation fraud in five states from 2012–2016 where politicians argued fraud was pernicious
•A specialized United States Department of Justice unit formed with the goal of finding instances of federal election fraud examined the 2002 and 2004 federal elections, and were able to prove that 0.00000013 percent of ballots cast were fraudulent
•Other well-cited analyses put the rate in the hundred-thousandths to millionths of a percent. For example, an MIT study of mail ballots over two decades called mail-in fraud "exceedingly rare" at about 0.00006 percent of votes nationally, and Brookings' review of Heritage Foundation data calculated Arizona fraudulent votes as roughly 0.0000845 percent across decades.
3. How many proven cases exist?
The most-cited public compilation is the Heritage Foundation's Election Fraud Database, which is described as just a sampling and not an exhaustive list:
•It lists roughly 1,561 "proven instances" yielding about 1,325 convictions across its time window, and it reports that 20 new cases were brought in 2024
•Other summaries of the same database describe "about 1,300 convictions" over decades, or about 30-40 proven cases per year on average over 40+ years.
That total is spread across more than 40 years and hundreds of millions of votes cast in federal, state and local elections nationwide. Even Heritage lists 1,561 instances of voter fraud resulting in 1,325 convictions — across an entire country voting for 40+ years — of those, just 20 cases were brought in 2024
For comparison, investigators examining 84 million votes cast in 22 states found 14 instances of fraud referred for prosecution, which amounts to a 0.000017 percent fraud rate
4. Types of fraud that do occur
When fraud does occur, federal authorities categorize it as:
Types of fraud include voter impersonation or in-person voter fraud, mail-in or absentee ballot fraud, illegal voting by noncitizens, and double voting
According to Heritage and FBI definitions, common categories include:
•Impersonation fraud at the polls — the rarest form
•Absentee Ballot Fraud: The most common form of modern fraud, involving someone filling out or forging a mail-in ballot for another person
•Duplicate / Double voting: An individual voting in two different jurisdictions
•False registrations, vote buying, illegal "assistance" at the polls, ineligible voting, altering the vote count, and ballot petition fraud
•The FBI also defines voter/ballot fraud to include intentionally giving false information when registering, receiving money for voting, voting more than once, or an election official corrupting their office
Research finds impersonation at the polling place is the rarest of all: one 12-year nationwide study found impersonation fraud by voters at the polls to be the rarest fraud of all: only 10 cases alleged in 12 years
5. What courts and federal agencies say
•Courts Agree: Fraud by Voters at the Polls is Nearly Non-Existent
The Fifth Circuit noted there were "only two convictions for in-person voter impersonation fraud out of 20 million votes cast in the decade" before Texas passed its voter ID law, and the Fourth Circuit noted North Carolina "failed to identify even a single individual who has ever been charged with committing in-person voter fraud"
•Government Investigations Agree: Voter Fraud Is Rare — e.g., Kansas, Texas, Colorado and Florida investigations that started with allegations of 100+ cases yielded 1 to a handful of convictions
•Federal election-security agencies including CISA and the FBI called the 2020 election the "most secure in American history", a conclusion also echoed for 2020 security by national security and election agencies
6. Why the debate persists
•Isolated cases do happen. Scholars note that documented cases exist, but existence does not settle whether fraud is frequent or large enough to alter outcomes, and that while fraud is rare in modern U.S. elections at the national level, it can matter more in close local contests where margins are a few dozen votes.
•Perception vs. evidence: Research has shown that even though studies consistently find few instances of in-person voter fraud, public belief that fraud is common remains high — in one 2016 Washington Post poll, 46% of Americans believed voter fraud occurred frequently, in part driven by rhetoric and media coverage.
•Arguments that it IS a problem typically emphasize: 1) Heritage-style database proves fraud is "real and pressing" even if counts are low, 2) even small numbers undermine confidence, and 3) enforcement depends on detection, so true rate may be undercounted.
•Arguments that it is NOT a systemic problem emphasize that exhaustive multi-year pulls of every state record found the overall fraud rate to be "infinitesimal", that no rigorous body of research has shown fraud at the scale necessary to flip major elections, and that many alleged instances turn out to be clerical errors or bad data matching.
Bottom line
•Voter fraud is not a myth — proven cases of double voting, absentee ballot fraud, false registrations and ineligible voting have resulted in more than 1,000 criminal convictions over four decades.
•But measured against the hundreds of millions of ballots cast, the rate is consistently documented in the range of 0.0003% to 0.0025% in Brennan Center reviews, and even lower (0.000017%, 0.00000013%) in government audits — orders of magnitude too low to rig statewide or national elections under current evidence.
Most experts and election officials therefore describe election fraud in federal U.S. elections as real but extremely rare and not a systemic problem, while acknowledging that maintaining verification, audits and prosecution remains important for public confidence and for protecting tight down-ballot races.