The vice president votes in the Senate only to break a tie. Article I, Section 3 of the Constitution makes the vice president President of the Senate but says they “shall have no Vote, unless they be equally divided.” In practice that means a 50-50 vote on anything that needs a simple majority: nominations, budget reconciliation bills, amendments and many procedural motions. It doesn’t help on votes that need 60 or two-thirds.
Kamala Harris holds the record with 33 tie-breaking votes. JD Vance cast 8 in the first six months of 2025 alone. Here’s how the tie-breaker works and why it matters so much in a closely divided Senate.
Why does the vice president preside over the Senate? #
The Framers needed a way to settle deadlocks in the Senate without giving any state extra weight. If a senator broke ties, their state would effectively get a third vote. Handing the job to the vice president, who is elected nationally, solved that.
The clause reads: “The Vice President of the United States shall be President of the Senate, but shall have no Vote, unless they be equally divided.” It’s one of the few places in the Constitution where the executive branch sits directly inside the legislature.
How does a tie-breaking vote happen in practice? #
The vice president rarely presides over routine business. The president pro tempore, traditionally the longest-serving senator in the majority, and a rotation of junior senators handle most days in the chair.
When a tie is coming, the process is simple:
- Whips count votes. Party leaders know in advance when a vote is heading for 50-50.
- The vice president comes to the Capitol. They usually wait off the floor until the vote is called.
- They take the chair and vote. If the roll call ties, the vice president announces their vote from the chair and the measure passes or fails.
If the vice president isn’t there and the vote ties, the measure fails, because a tie isn’t a majority.
Which votes can the vice president break? #
Only those decided by a simple majority of senators voting. Anything that needs a larger threshold is out of reach, because 50 plus one doesn’t get there.
| Senate vote | Threshold | Can the VP break a tie? |
|---|---|---|
| Cabinet and judicial nominations | Simple majority | Yes |
| Budget reconciliation bills | Simple majority | Yes |
| Amendments and most procedural motions | Simple majority | Yes |
| Passing a bill after debate has closed | Simple majority | Yes |
| Cloture (ending a filibuster) | Three-fifths of senators, usually 60 | No |
| Treaties | Two-thirds of senators present | No |
| Overriding a veto | Two-thirds | No |
| Convicting in an impeachment trial | Two-thirds | No |
That’s why the filibuster shapes so much of what a tie-breaker can do. Most legislation needs 60 votes to get past cloture, so the vice president matters most on nominations and reconciliation. We explain both in how the Senate filibuster works and how budget reconciliation works, and cloture itself in what a cloture vote is.
The tie-breaking record #
Tie-breakers used to be rare. Close Senates and party-line voting have made them common. Here are the leaders, based on the Senate’s historical records.
| Vice president | Tie-breaking votes |
|---|---|
| Kamala Harris (2021–2025) | 33, the record |
| John C. Calhoun (1825–1832) | 31 |
| John Adams (1789–1797) | 29 |
| Mike Pence (2017–2021) | 13 |
| JD Vance (2025– ) | 8 by mid-July 2025 |
Harris’s total came from the 117th Congress, when the Senate was split 50-50 and Democrats held the majority only because of her vote. Vance’s early votes included the confirmation of Pete Hegseth as Secretary of Defense in January 2025 and passage of the budget reconciliation bill in July 2025. Pence cast the first tie-breaker ever on a Cabinet nominee, for Betsy DeVos in 2017.
Why tie-breakers happen even in a 53-47 Senate #
The Senate began 2025 with 53 Republicans, 45 Democrats and 2 independents who caucus with Democrats. A 50-50 tie still happens whenever three majority senators vote with the minority, which is exactly what occurred on several high-profile votes in 2025. The narrower the majority, the more often the vice president is needed.
That’s one reason the 35 Senate races on the November 3, 2026 ballot get so much attention. Our list of every Senate seat up in 2026 covers who’s running. Because the vice president breaks ties, a 50-50 Senate is controlled by the vice president’s party, so the minority needs 51 seats for a majority.
Election Tracker groups every published Senate poll by race, each with a 30-day average and a trend line once there’s enough data, so you can see which seats are close enough to decide the majority. Its Market Sentiment tab also shows current Polymarket prices on Senate control and on how many seats Republicans will hold after the midterms. The app labels those prices as trader sentiment, not forecasts.
What happens with ties in Senate committees? #
The vice president has no vote in committees. A tied committee vote means the measure or nomination isn’t reported favorably. During the 50-50 Senate of 2021 and 2022, the two parties’ power-sharing agreement split committees evenly and let leaders bring a deadlocked nomination or bill to the floor through a discharge motion, a vote on which the vice president could break a tie.
Frequently asked questions #
Can the vice president vote to create a tie? #
No. The vice president can vote only when senators are already equally divided. They can’t turn a 51-49 vote into a 51-51 tie.
Can the vice president speak in Senate debates? #
Not in the modern Senate. Early vice presidents occasionally addressed the chamber, but today the presiding officer doesn’t take part in debate. The vice president’s influence comes through the tie-breaking vote and informal lobbying off the floor.
What happens if a Senate election ends in a tie? #
That’s a different question, about a tied election for a Senate seat rather than a tied vote in the chamber, and state law decides it. We cover it in what happens if a US Senate race ends in a tie.
Has a vice president ever voted against their own president? #
It happened in the early republic, when vice presidents were sometimes political rivals of the president, before the 12th Amendment changed how they were elected. Modern vice presidents run on the same ticket and vote with the administration.
Can the president pro tempore break ties? #
No. The president pro tempore is a senator and votes once, like any other senator. Only the vice president has the extra tie-breaking vote.