A New Balance of Power: What the 120th Congress Means for Federal Tax Legislation

The 2026 midterm elections have shifted the balance of power in Congress. Democrats have taken control of the Senate with at least 54 seats, compared with 44 for Republicans. Two races, in Alaska and Mississippi, are still undecided. In the House of Representatives, Democrats have secured control of the chamber with at least 255 seats, according to the Associated Press.

The last time Democrats won a Senate majority of comparable size, in 1986, they picked up eight seats to reach 55 and kept the majority for eight years.

Major Changes to the Tax-Writing Committees

Most federal tax policy comes from the Senate Finance Committee and the House Ways and Means Committee. Both will see significant turnover.

Senate Finance Committee

Currently, the Senate Finance Committee has 14 Republican seats and 13 Democratic seats, with Senator Mike Crapo as the Chair. When the new Congress convenes in 2027, Democrats will hold 15 seats and Republicans 12. Eight new members are expected to be appointed, representing about 30% of the committee.

Democrats will have 11 returning members and four new appointments. Republicans will have eight returning members and also need four new appointments to fill their 12 seats.

Senator Ron Wyden is expected to become chair. He has already released a statement setting out the Democratic agenda for the committee, which includes, in his words, “ensuring billionaires pay their fair share and hold tax cheats accountable.” Wyden also said Democrats will focus on health care and trade policy, including efforts to bring down costs.

House Ways and Means Committee

The House Ways and Means Committee currently has 26 Republicans and 18 Democrats. In the new Congress, those numbers are expected to reverse to 26 Democrats and 18 Republicans. Based on that composition, Democrats will have 12 seats to fill, while Republicans will need only one new appointment. Representative Richard Neal is expected to become the chair.

Timing of Committee Appointments

Each party will choose its leaders and committee members in November and December 2026. However, the committee rosters can’t be formally approved until each chamber votes on its organizing resolutions after the 120th Congress convenes. Final appointments are expected in January 2027. After those resolutions pass, the committees will formally organize and confirm their chairs and subcommittee assignments.

Prospects for a Lame-Duck Tax Bill

Congress faces several federal priorities before year-end and the swearing-in of the new Congress. These include FY2027 government funding before H.R. 6500, the Continuing Appropriations and Extensions Act, 2027 expires on December 11. Other priorities include the National Defense Authorization Act for Fiscal Year 2027, health care extenders and the Farm, Food, and National Security Act of 2026. Any tax provisions added to these bills would most likely need bipartisan support, and Democrats may prefer to wait until January, when they take the majority, to advance their own tax proposals.

Tax Legislation Before 2028 Election

Democrats will have wider margins in the new Congress than Republicans had in the last one. Even so, President Trump can still veto any bill, including budget reconciliation legislation, and Democrats won’t have the two-thirds majority needed to override a veto. Whether new tax legislation becomes law in the next two years will depend heavily on whether President Trump and the new Congress work together to reach agreement on tax policy.

One of the most likely openings for major legislation in 2027 is the next debt-limit increase. According to the Bipartisan Policy Center, the United States is projected to reach the current $41.1 trillion debt limit sometime between late winter and mid-summer 2027. No vote has been scheduled yet, but Congress is expected to act on the debt limit in spring or summer 2027. That vote could become a vehicle for tax and spending negotiations.

Conclusion

The midterm results have redrawn the membership of the committees that shape federal tax policy, yet a fresh majority is no promise of new legislation. Democrats will steer the agenda on both tax-writing panels, and Senator Wyden has signaled his priorities will include tax policies affecting high-income taxpayers and increased tax enforcement. Still, President Trump retains his veto pen, and Democrats lack the two-thirds margin to overcome it. Whatever tax measure reaches enactment during the 120th Congress will likely reflect bargaining between both sides rather than a one-party rewrite.

For that reason, businesses may see greater stability in the tax landscape over the coming two years. With a Democratic Congress facing a Republican White House, any tax bill will likely require give-and-take, making a broad overhaul of today’s rules less likely before 2029. Narrower adjustments remain possible, particularly if tax items get folded into a debt-limit agreement. On balance, though, the current legislative outlook suggests a reasonably steady backdrop for near-term planning. Business owners should use this window to sharpen their planning, watch debt-limit talks closely and keep their advisors informed and engaged.