If the Senate needs 60 votes to pass anything, how did the 2017 tax cuts pass with 51? How did the American Rescue Plan and the Inflation Reduction Act pass with 50? The answer to all of them is the same three words: budget reconciliation — the filibuster’s enormous, carefully fenced exception, and functionally the only way major partisan legislation becomes law anymore.
How the process works
Created by the Congressional Budget Act of 1974, reconciliation was designed as a technical tool for aligning tax and spending laws with the annual budget. The modern sequence:
- Congress passes a budget resolution containing reconciliation instructions — targets telling committees to change spending or revenues by specified amounts.
- Committees draft legislation hitting those targets, bundled into a reconciliation bill.
- In the Senate, the bill gets limited debate (20 hours) and cannot be filibustered — meaning final passage needs only a simple majority.
Debate limits also produce the Senate’s strangest ritual: vote-a-rama, a marathon session — often overnight — where senators offer unlimited amendments in rapid succession, mostly to force the other party into embarrassing on-the-record votes for attack ads.
The Byrd Rule: the fence around the cheat code
The catch is the Byrd Rule, named for Senator Robert Byrd, which lets any senator strike provisions that are “extraneous” to the budget — most importantly, anything whose budgetary effect is “merely incidental” to a policy purpose, and anything increasing deficits beyond the budget window (the reason the 2017 tax cuts were written to expire). The referee is the Senate parliamentarian, an unelected rules expert whose rulings — delivered in a process nicknamed the “Byrd bath” — have repeatedly reshaped major legislation, famously striking a $15 minimum wage from the 2021 rescue package and immigration provisions from later attempts.
Can: taxes, spending, entitlement changes, anything with a real budgetary core — which is why tax cuts, stimulus, health-subsidy and climate-spending packages all ride this lane. Cannot: pure policy — voting rights, abortion law, gun rules, labor law — where the budget effect is incidental. That boundary is precisely why the pressure to eliminate the filibuster never dies: everything reconciliation cannot carry needs 60 votes or a nuclear option.
Why it now runs Washington
As the filibuster hardened into a universal 60-vote wall, reconciliation became the only reliable train leaving the station — so both parties learned to load their entire domestic agenda onto it. The 2017 Trump tax cuts, the 2021 American Rescue Plan, the 2022 Inflation Reduction Act, and the sweeping 2025 Republican budget package all passed this way, most on party-line votes with vice presidents breaking ties or margins of one. The pattern has a cost: agendas warp to fit the Byrd Rule’s shape, permanent policy gets written as expiring provisions, and an unelected parliamentarian holds a quiet veto over what a governing majority can attempt. It is nobody’s idea of good process — and it is the only process currently working.