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Veto and veto override markets

Veto markets ask whether an executive will reject a bill, and sometimes whether the legislature will override that rejection. They sit at the intersection of politics and procedure. The procedure is often where readers get tripped up.

The signing window

Under the US Constitution, once a bill passes both chambers and is presented to the president, the president has ten days (Sundays excepted) to sign or veto it. If the president does neither while Congress is in session, the bill becomes law without a signature.

Two details matter for markets:

• Presentment timing: Congress controls when a passed bill is formally sent to the president, which can be days after the final vote. A by-date market may hinge on that gap.
• Pocket vetoes: If Congress adjourns in a way that prevents the bill's return within the window, an unsigned bill does not become law. Whether a particular recess qualifies has been disputed historically.

US governors have their own windows, set by state constitutions, and many have a line-item veto for appropriations that the president does not.

Threats vs actions

A statement of administration policy saying advisers would recommend a veto, or a public threat, is not a veto. Markets should distinguish between "announces intent to veto" and "vetoes." This is the same announcement vs occurrence distinction that appears across political markets. Threats are also often used as negotiating leverage, so a threat followed by a revised bill and a signature is common.

Override math

Overriding a presidential veto requires a two-thirds vote of members present and voting in both chambers. Because it depends on members present, absences can shift the number of votes needed. The originating chamber votes first; if it fails there, the other chamber never votes. Historically, the large majority of presidential vetoes have not been overridden.

Read legislative vote and bill passage markets for vote-counting basics, and note that because an override already needs two-thirds, more than the three-fifths needed for Senate cloture, the filibuster is rarely the binding constraint — see our filibuster and cloture guide.

Comparing initial vote margins

A useful sanity check is the original passage vote. If a bill passed the House 230–200, an override needs a significant number of members to switch, which is uncommon when the veto comes from their own party's president. A bill that passed with veto-proof margins is a different situation, though members sometimes switch after a veto on party-loyalty grounds.

Deadline and funding contexts

Vetoes become especially relevant around funding deadlines — see government shutdown and debt ceiling deadline markets. A vetoed spending bill near a deadline can create linked outcomes across several contracts.

A worked example

A bill passes the Senate 52–48 and the House narrowly. The president has publicly threatened a veto. A market on a veto by month-end trades at 70 cents (illustrative — verify live). A reader checks whether the bill has been formally presented, how many days remain in the window, whether Congress is scheduled to adjourn, and whether negotiations on a revised bill are underway — each of which can change both timing and outcome.

Before you act on a price

• Read the full title and rules, including the named settlement source, the threshold, and the time zone.
• Convert the Yes and No prices to implied probabilities with the implied probability tool and note the gap between them.
• Account for fees and spread — the fee drag tool uses assumptions only, so verify the live schedule on the venue.
• Write your own probability range and the evidence behind it before comparing it with the crowd.
• Check related and near-duplicate markets for consistency; prices on this page are illustrative — verify live cents on the operator.

The bottom line

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