Supreme Court upholds Mississippi mail ballot grace period

The supreme court, the United States' highest tribunal, upheld Mississippi's mail-in ballot grace period on June 29, 2026, ruling 5-4 that ballots postmarked by Election Day may be counted within five business days. The decision in Watson v. Republican National Committee rejects an RNC challenge and preserves similar laws in at least 13 other states before November's midterms.

Monday's ruling settles a dispute that reached the high court after the Fifth U.S. Circuit Court of Appeals struck down Mississippi's law in October 2024. The Republican National Committee, the state's Republican Party, and the Libertarian Party of Mississippi had argued that federal statutes setting Election Day preempt state rules allowing late-arriving ballots to be counted.

Key Takeaways

• The Supreme Court voted 5-4 to uphold Mississippi's five-day grace period for mail ballots postmarked by Election Day.
• Justice Amy Coney Barrett wrote the majority opinion; Justices Samuel Alito, Clarence Thomas, Neil Gorsuch, and Brett Kavanaugh dissented.
• Similar late-arrival rules in California, New York, Texas, and at least 10 other states plus Washington, D.C., remain in effect.
• Mississippi's Republican attorney general, Lynn Fitch, defended the state law in court against her own party's challenge.
• The ruling avoids a last-minute overhaul of state election procedures weeks before the 2026 midterms.

What Did the Supreme Court Decide About Late Mail-In Ballots?

In Watson v. Republican National Committee, the Supreme Court held that Mississippi's 2020 law does not conflict with federal Election Day statutes. The law permits election officials to count mail-in ballots received up to five business days after Election Day, provided they were postmarked on or before that date.

Writing for the majority, Justice Barrett said federal law designates the Tuesday after the first Monday in November as Election Day but says nothing about when ballots must be received. "The election-day statutes say nothing about ballot receipt, and we cannot add to the words Congress chose," she wrote, according to The New York Times.

Barrett added that "the defining element of an 'election' has always been the electorate's choice of candidate," and that choice is made when voting is complete, not necessarily when ballots reach officials. Mississippi Secretary of State Michael Watson, a Republican, had defended the grace period on similar grounds.

Why Does This Ruling Matter for the 2026 Midterms?

The decision preserves mail-in voting policies in 14 jurisdictions ahead of November, when control of the House and Senate is at stake. Without the ruling, election officials in Mississippi and states with comparable laws could have been forced to reject ballots that arrived after Election Day despite timely postmarks.

Legal experts noted that a ruling for the RNC could have invited broader challenges to early and mail voting nationwide. Instead, the court left ballot-receipt deadlines to the states, each of which administers its own elections under the federal Election Day calendar.

The timing also matters politically. President Trump has repeatedly criticized mail-in voting, and a contrary ruling would have fueled fresh disputes over election integrity just months before voters head to the polls. For more on how courts and technology are reshaping civic life, see our Future Tech & AI Wonders coverage.

How Did the Justices Split on Mississippi's Ballot Deadline?

The 5-4 divide fell along familiar lines. Barrett wrote for a majority joined by Chief Justice John Roberts and Justices Sonia Sotomayor, Elena Kagan, and Ketanji Brown Jackson, according to The Washington Post.

In dissent, Justice Alito warned the decision "creates a serious risk of further undermining public confidence in our elections and our system of self-government." He was joined by Thomas, Gorsuch, and Kavanaugh.

The case is one of several major election disputes on the court's docket this term, alongside decisions narrowing a landmark voting rights law and a pending challenge to campaign finance restrictions. Monday's outcome keeps Mississippi's grace period—and those modeled on it—on the books for the foreseeable future.