How the Supreme Court’s Mail Ballot Ruling Affects Your Vote

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A mail ballot can meet the mailing deadline and still arrive too late to count. A state’s receipt deadline decides how much time remains for the envelope to reach election officials.

The Supreme Court, ruling on June 29, 2026, rejected the argument that the federal laws setting Election Day require mail ballots to arrive by that day. That preserves extra delivery time where state law allows it, but leaves voters facing different return rules in different states.

The Court decided the case and preserved state receipt rules

The case is Michael Watson, Mississippi Secretary of State v. Republican National Committee, docket number 24-1260. On June 29, 2026, the Supreme Court reversed the U.S. Court of Appeals for the Fifth Circuit, the appeals court that had ruled against Mississippi, and sent the case back for further proceedings. On September 9, 2026, the Fifth Circuit, acting on the Supreme Court’s remand, affirmed the district court’s judgment for Mississippi.

The vote was five to four. Justice Barrett wrote the majority opinion, joined by Chief Justice Roberts and Justices Sotomayor, Kagan and Jackson. Justice Alito dissented, joined by Justices Thomas and Gorsuch and, for most of the opinion, Justice Kavanaugh. The Court’s judgment was issued on July 31, 2026. Under Supreme Court Rule 45, issuing the judgment in a federal-court case sends the lower court the Court’s opinion and a certified copy of its judgment, normally 32 days after the decision.

Alito’s dissent argued that the electorate’s collective choice becomes authoritative when the collection of ballots reaches election officials, so adding ballots received afterward postpones that choice beyond the federally required day. He would have upheld the Fifth Circuit’s ruling against Mississippi’s later receipt deadline.

The majority concluded that the federal election-day statutes say nothing about ballot receipt. The ruling removes that federal objection to a later receipt deadline; it does not require any state to adopt one. For voters, the deadline still comes from the law and instructions of the state running the election.

Mississippi’s rule and the lawsuit against it

Mississippi requires mailed absentee ballots to be postmarked on or before Election Day and received no more than five business days afterward. Under that rule, the extra days are only for a ballot already postmarked to reach election officials.

In 2024, the Republican National Committee, the Mississippi Republican Party and individuals sued Mississippi election officials, arguing that federal law bars the state from counting absentee ballots received after Election Day. The Libertarian Party of Mississippi brought a similar suit, and the district court consolidated the cases and ruled for Mississippi.

The Fifth Circuit reversed, holding that Mississippi’s later receipt deadline is preempted, or overridden, by federal law. It ruled on the law but left the remedy to the district court, sending the case back with an instruction to weigh the value of leaving existing rules in place on the eve of an election. The Supreme Court’s later reversal means that Fifth Circuit ruling no longer controls.

The Fifth Circuit’s October 2024 opinion did not itself order officials to reject those ballots: it declined to grant a permanent injunction, leaving relief to the district court. Mississippi’s election office was still instructing voters on November 4, 2024 to postmark ballots by November 5 and have them received by November 13.

The Supreme Court described the challenge as a narrow timing dispute that did not contest absentee voting itself, early voting, or counting and certification after Election Day.

Why the two sides read Election Day differently

Federal law sets House elections on the Tuesday after the first Monday in November of each even-numbered year. Related federal statutes set the election timing for senators and presidential electors. The disagreement was over what must be completed by that day: the voter’s submission or the election office’s receipt.

The Republican challengers’ Supreme Court brief argued that an election is a public process ending when officials receive the ballots, rather than when individual voters make their choices. They pointed to historical practices in which even absentee ballots were received by officials on Election Day. Their brief distinguished receipt, when the ballot box closes and the result is fixed, from later counting, certification and announcement of a winner. That argument did not require officials to know the winner on election night; it required them to have the ballots that would determine the winner.

Mississippi argued in its Supreme Court brief that an election is completed when voters mark and submit their ballots through the state’s lawful method. Its brief distinguished mailing a ballot to the registrar with a timely postmark from merely leaving a marked ballot in a drawer. On that view, delivery is the transport of an already completed choice, rather than an opportunity to keep voting.

Mississippi also argued that receipt on Election Day was common in the nineteenth century because voting then largely occurred in person, and that this history does not stop states from adopting different practices. The state’s brief warned that the Fifth Circuit’s reasoning would bar court orders extending ballot-receipt deadlines for service members under the Uniformed and Overseas Citizens Absentee Voting Act (UOCAVA), the federal law on absentee voting by military and overseas voters.

The challengers, for their part, argued that federal backup provisions, such as UOCAVA’s write-in ballot for a voter whose state absentee ballot does not arrive in time, do not change what makes a ballot timely in ordinary circumstances.

The challengers relied on Foster v. Love, an earlier Supreme Court decision that described an election as the combined actions of voters and officials meant to make a final selection of an officeholder. The Court answered that Foster decided only that an election may not be completed before federal Election Day and does not mention ballot receipt. The Court also concluded that UOCAVA confirms that federal law dictates when ballots must be cast, while state law dictates when they must be received.

The ruling does not make every state’s deadline the same

The Supreme Court’s opinion describes Mississippi as one of roughly 30 states that count at least some absentee ballots mailed by Election Day but received afterward. The National Conference of State Legislatures publishes a table of each state’s postmark and receipt deadlines for mailed ballots, and a second table for military and overseas voters. Use that comparison as an overview, then confirm the rule with the election office responsible for the ballot.

California’s official instructions require mailed ballots to be postmarked by Election Day and received within seven days afterward. Mississippi, as noted above, also requires a postmark by Election Day but allows five business days for the ballot to arrive. In both states a ballot must meet both requirements: one that arrives inside the window still does not count if it was postmarked late.

An Ohio law effective March 20, 2026, eliminated the four-day grace period for regular mailed absentee ballots and requires them to be delivered by 7:30 p.m. on Election Day. The Supreme Court’s decision does not itself restore a grace period a state has removed.

The U.S. Election Assistance Commission explains that ballots must be sent at least 45 days before a federal election to military and overseas voters covered by UOCAVA who request them before that deadline. The 45-day requirement tells election officials when to send ballots; state receipt rules tell voters when those ballots must arrive. Military and overseas voters should confirm the rules that apply to their own category, rather than assume the ordinary domestic deadline applies.

A postmark is not a guarantee of timely delivery

The U.S. Postal Service (USPS) says a postmark applied at a processing facility shows the date of the first automated processing operation, which is not necessarily the first day USPS had the mail. A ballot can therefore go into the mail on one day and be postmarked on a later one.

A Postal Service rule on postmarks, effective December 24, 2025, said it did not change existing postal operations or postmarking practices. USPS says a voter can request a free manual postmark at a postal retail counter so that the postmark date matches the date USPS accepts the ballot. A same-day postmark addresses proof of mailing; it does not make the ballot arrive that day.

USPS reported that 97.73 percent of ballots returned from voters to election officials in 2024 were delivered in fewer than three days, with an average delivery time of one day. Those figures describe ballots as a group; they do not promise that any one envelope will arrive before its legal deadline.

The Election Assistance Commission’s 2024 survey report lists late receipt or a missed deadline as the reason for 17.8 percent of rejected mail ballots. That figure concerns rejected ballots, not all mailed ballots, and it does not identify postal delay as the cause of every rejection. Leave time for both the mailing requirement and the receipt requirement.

Check the actual deadline and the permitted backup

For domestic nonmilitary voters returning ballots by mail, USPS recommends mailing before Election Day and at least one week before the election office’s receipt deadline. Both parts of that advice apply, and it does not replace a state’s own postmark deadline or guarantee that a ballot will be accepted. USA.gov provides a directory for finding state and local election offices. Ask that office for the current postmark deadline, receipt deadline and permitted return methods for the specific election.

The Election Assistance Commission says hand delivery or a drop box may be available depending on local rules, and many states offer online ballot tracking. Check the allowed location and cutoff before using an alternative to the mail. Use tracking to identify a problem while there is still time to ask an official about it.

USA.gov says that a voter with an absentee ballot who wants to vote in person must follow state or local procedures, which may involve exchanging the ballot, handing it in or casting a provisional ballot. The Election Assistance Commission says a provisional ballot is counted only after officials verify that the voter is eligible and has not already voted in the election. Do not assume that showing up in person automatically cancels a mailed ballot or guarantees a second ballot will count. If a ballot was requested or sent and its status is unclear, the election office can say how to proceed.

The Election Assistance Commission describes the Federal Write-In Absentee Ballot as an emergency backup for eligible military and overseas voters who have not received their requested regular absentee ballot. That backup can be used for federal offices and for other elections as state law permits. Military and overseas voters whose regular ballot has not arrived should ask their election office about that option and its deadline. It is not a universal substitute for a domestic mail ballot that missed its deadline.

The National Conference of State Legislatures describes ballot curing as a state process for fixing problems such as a missing or mismatched envelope signature. A signature repair process should not be treated as permission to return the ballot late. The election office can say what can be corrected, how voters are notified and when the correction is due.