Reference
What Is a Conference Committee?
A conference committee is a temporary joint committee of House and Senate members formed to reconcile differences between House and Senate versions of the same bill. The Constitution requires that both chambers pass identical legislation before it can be sent to the President.
Last updated May 2026
Why Conference Committees Are Needed
The legislative process requires the House and Senate to pass the exact same text of a bill before it can go to the President. In practice, each chamber often passes its own version of the same legislation, with different provisions, spending levels, or policy details.
When the two versions differ, Congress has a choice: one chamber can simply adopt the other's version, they can trade amendments back and forth (called "ping-pong"), or they can formally convene a conference committee to negotiate a single compromise version.
Conference committees are typically used for major, complex legislation — like defense authorization bills or appropriations packages — where the differences between chambers are numerous and require structured negotiation.
How a Conference Committee Works
Both chambers must agree to go to conference. The House and Senate each appoint a group of "conferees" — members who will negotiate the final text. These are typically members from the committees that originally handled the bill, and each chamber's group is led by a senior majority and minority member.
Conferees meet to negotiate a compromise between the two versions. Their work is bounded by the provisions in dispute — they generally cannot add completely new material that was not in either version, and they must stay within the scope of the differences between the two bills.
The negotiations can be brief or take weeks, depending on the complexity of the legislation and the distance between the two versions.
The Conference Report
When conferees reach agreement, they produce a conference report — a document containing the agreed-upon final text of the bill along with a joint explanatory statement explaining the decisions made.
Both chambers must vote to adopt the conference report. The vote is an up-or-down choice — members cannot amend the conference report. Each chamber votes separately, and both must approve. If one chamber rejects the conference report, the bill is dead unless they return to negotiation.
Once both chambers adopt the conference report, the identical text goes to the President for signature or veto.
The Alternative: Ping-Pong
In practice, formal conference committees have become less common. The more frequent approach is informally called "ping-pong" or "amendment exchange" — one chamber passes its bill, the other amends it and sends it back, and chambers trade amendments until they converge on identical text.
Ping-pong is faster and less formal than a conference committee, but it puts more negotiating power in the hands of leadership rather than the committee members who originally drafted the legislation. Major bills — including many appropriations packages and the annual National Defense Authorization Act — still go through formal or informal conference-style negotiations.
See How a Bill Becomes a Law for the full legislative process.
Frequently Asked Questions
What is a conference committee?
A conference committee is a temporary joint committee of House and Senate members formed to reconcile differences between the two chambers' versions of the same bill. The Constitution requires both chambers to pass identical text before a bill can go to the President.
Why is a conference committee needed?
When the House and Senate pass different versions of the same bill, those differences must be resolved before it can become law. A conference committee is one way to negotiate a single compromise version. Alternatively, the chambers can trade amendments back and forth — a process called ping-pong.
Who serves on a conference committee?
Both chambers appoint "conferees" — typically members of the committees that originally handled the legislation. Both majority and minority members are represented, with senior members leading the negotiations for each side.
What is a conference report?
A conference report is the document produced by a conference committee containing the agreed-upon final text of the bill. Both the House and Senate must vote to adopt the conference report with no amendments allowed. If both chambers approve, the final text goes to the President.
Can a conference committee add new provisions to a bill?
No. Conference committees are generally limited to resolving differences between the two versions. They cannot add entirely new provisions that were not in either the House or Senate version, and they must stay within the scope of the disagreements they were convened to resolve.
How common are conference committees today?
Formal conference committees have become less common in recent decades. Congress more often uses the informal "ping-pong" process — trading amendments between chambers — which is faster but concentrates negotiating power in party leadership rather than committee members.