In voting, a ballot is not included in the vote count if a law declares or an election authority determines that it is spoilt (chiefly British), spoiled (chiefly American), void, null, informal, invalid, rejected or stray. This may occur accidentally or deliberately.
The total number of spoilt votes in a United States election has been called the residual vote.Caltech/MIT Voting Technology Project, Residual Votes Attributable to Technology: An Assessment of the Reliability of Existing Voting Equipment, version 2, 3 Mar. 2001, http://www.hss.caltech.edu/~voting/Caltech_MIT_Report_Version2.pdf
In some jurisdictions, spoilt votes are counted and reported.
As an example, UK law specifically precludes ballots "on which votes are given for more candidates than the voter is entitled to vote for", "on which anything is written or marked by which the voter can be identified" or "which are unmarked or void for uncertainty".
In Canada, a spoiled ballot is one that has been handled by an elector in such a manner that it is ruined beyond use, or that the deputy returning officer finds soiled or improperly printed. The spoilt ballot is not placed in the ballot box, but rather is marked as spoilt by the deputy returning officer and set aside. The elector is given another ballot. A 'rejected ballot' is one which cannot be counted due to improper marking by the voter. Examples of this are ballots which have more than one mark, the intent of the voter cannot be ascertained, or the voter can be identified by their mark.
In many jurisdictions, if multiple elections or referendums are held simultaneously, then there may be separate physical ballots for each, which may be printed on different-colored paper and posted into separate ballot boxes. In the United States, a single physical ballot is often used to record multiple separate votes. In such cases one can distinguish an "invalid ballot", where all votes on the ballot are rendered invalid,See, for example, Determining the Validity of Optical Scan Ballot Markings, Michigan Bureau of Elections, May 27, 2004. from a "partially valid" ballot, with some votes are valid and others invalid.
A None of the above option on the ballot was shown to reduce spoilt votes. The Supreme Court of India mandated 2013 in India the "None of the above" option.
The Sham election may be questioned if there is an unusually high proportion of spoilt votes.
In multiple-vote U.S. ballots, voter rolloff is calculated by subtracting the number of votes cast for a "down-ballot" office, such as mayor, from the number of votes cast for a "top-of-the-ballot" office, such as president. When the election jurisdiction does not report voter turnout, roll-off can be used as a proxy for residual votes. Some voters may only be interested in voting for the major offices, and not bother filling in the lower positions, resulting in a partially valid ballot.
While it is not illegal to advocate informal voting in Australian federal elections, it was briefly illegal to advise voters to fill out their ballots using duplicated numbers. Albert Langer was jailed for violating an injunction not to advocate incomplete preference voting for the 1996 Australian federal election.
During the 2021 Hong Kong legislative elections, pro-democratic supporters urged voters to cast spoilt ballots or not vote in the election in protest of the rewriting of election rules by the National People's Congress in Beijing. Despite the government criminalising inciting voters to cast invalid ballots or not vote, as well as attempts to boost voter turnout, the election recorded a record number of invalid ballots as well as historically low voter turnout.
Intentionally spoiling someone else's ballot before or during tabulation is considered electoral fraud.
The United States Election Assistance Commission's survey of the 2006 midterm elections reported undervoting rate of 0.1% in US Senate elections and 1.6% in US House elections; overvotes were much rarer. Some paper-based voting systems and most DRE voting machines can notify voters of under-votes and over-votes. The Help America Vote Act requires that voters are informed when they have overvoted, unless a paper-ballot voting system is in use. Help America Vote Act Section 301(a)1(A)(iii)
In the Philippines, votes cast for aspirants later declared as nuisance candidates whose name manage to get printed in ballots were considered stray votes prior to the 2013 elections. A particular type of nuisance candidates runs "to cause confusion among the voters by the similarity of the names" with a bona fide candidate for the same office.
Since the 2013 elections, votes for these class of nuisance candidates are transferred to their namesake bona fide candidate as valid votes.
See also
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