The nation’s fiscal policy is increasingly dominated by fiscal cliffs – several temporary tax and spending provisions applied to major, substantive and often important programs, which expire nearly simultaneously. Fiscal cliffs can be chaotic due to plausible threats of large tax increases or the elimination of valuable benefits if one party or the other does not get its way. This process makes sustainable progress on deficit reduction and entitlement reform much more difficult.
A fiscal cliff is a date established by current law on which taxes or government spending change abruptly unless Congress intervenes. It is not simply a large deficit. A structural deficit develops over time because recurring spending exceeds recurring revenue. A fiscal cliff concentrates important changes around a particular deadline and forces elected officials to decide whether current law should take effect.
A fiscal cliff also differs from a government shutdown or a debt-limit confrontation. A shutdown occurs when appropriations lapse and agencies lose authority to continue many operations. A debt-limit crisis occurs when the Treasury approaches the limit on authorized federal borrowing. A tax-policy cliff occurs because a deduction, credit, rate or other rule has been written to expire or change on a specified date.
If Congress does nothing, previous law takes effect automatically, often producing a large and abrupt tax increase for affected households. That was the threat at the end of 2025, when many of the individual provisions of the 2017 tax law were scheduled to expire. Congress ultimately prevented most of those increases by making the provisions permanent in the 2025 reconciliation law.
But Congress does not always defuse the time bomb. The enhanced Affordable Care Act premium tax credits also expired at the end of 2025. Their lapse caused substantial increases in net premiums, disrupted household budgets and left some families reconsidering whether they could afford coverage.
Fiscal cliffs therefore create two unattractive possibilities: a hurried agreement that extends popular benefits without sustainable financing, or political deadlock that allows abrupt tax increases or benefit losses to occur. Either outcome encourages chaos rather than deliberate fiscal policy.
The modern history of fiscal-cliff budgeting begins in earnest with the 2001 Economic Growth and Tax Relief Reconciliation Act. Temporary tax provisions had existed long before George W. Bush became president. Congress had used them for surcharges, investment incentives, emergency relief and targeted credits. The 2001 law was different because it placed most of a major individual tax overhaul on a single expiration schedule.
The institutional background was the Byrd Rule, which originated in 1985 and was later incorporated into the Congressional Budget Act. Reconciliation allows qualifying tax and spending legislation to pass the Senate without the ordinary 60 votes needed to end debate. The Byrd Rule, however, allows senators to challenge provisions that increase deficits beyond the period covered by the reconciliation measure.
Congress could have responded by reducing the size of the Bush tax cuts, financing them with permanent offsets, or obtaining 60 votes to waive the objection. Instead, it used a sunset. The tax reductions would formally disappear before they produced deficits outside the applicable budget window.
The 2001 law reduced individual tax rates, enlarged the child credit, addressed marriage penalties, expanded retirement incentives and changed the estate tax. Yet these provisions were generally scheduled to expire after 2010. Supporters of the law did not necessarily expect or desire the pre-2001 tax code to return. The sunset made it possible to enact a broad tax program through reconciliation while limiting the long-term deficit officially attributed to the legislation.
The estate tax provided the clearest illustration of the resulting policy incoherence. It was gradually reduced, repealed for 2010 and scheduled to return in 2011. That sequence was not a plausible permanent tax policy. It was the product of fitting the legislation within a limited budget window.
There is considerable irony in this result. The Byrd Rule was intended in part to protect the long-term budget from deficit-increasing legislation passed through a simple-majority process. The response was not to finance the legislation permanently. Congress instead complied formally by writing an expiration date into the law while creating benefits that supporters expected future Congresses to continue. A rule intended to encourage fiscal discipline helped produce a new source of fiscal instability.
The law also demonstrated the political power of temporary tax relief. Once taxpayers adjusted to lower rates and larger credits, expiration could be portrayed as a tax increase, even though the return to prior law had been written into the original legislation. The statutory burden remained on supporters to enact an extension. The political burden shifted toward those prepared to allow the tax reductions to expire.
When the original deadline approached, Congress did not permit the full tax law to revert. In 2010, it extended the Bush tax provisions for two more years. That moved the deadline to the end of 2012.
The new deadline then converged with the expiration of temporary payroll-tax relief and emergency unemployment benefits, the scheduled onset of automatic spending reductions and other changes. The combination became known as the “fiscal cliff.” Federal Reserve Chairman Ben Bernanke warned Congress in 2012 that allowing all the scheduled tax increases and spending cuts to take effect at once would threaten the still-fragile economic recovery.
Congress again declined to allow current law to operate fully. The American Taxpayer Relief Act, enacted at the beginning of 2013, made most of the Bush tax changes permanent for taxpayers below specified high-income thresholds while allowing the top income-tax rate to rise.
The sequence established the modern fiscal-cliff pattern: enact tax benefits temporarily, allow taxpayers to become accustomed to them, extend them as the deadline approaches and eventually make many of them permanent. What appears temporary in the statute can become presumptively permanent in political practice. The expiration date postpones the fiscal decision without necessarily changing its ultimate outcome.
Republicans did not remain the only party willing to use temporary provisions. Democrats employed them for pandemic-era expansions of the Child Tax Credit, the child and dependent care credit, the Earned Income Tax Credit and Affordable Care Act premium assistance. Republicans again made extensive use of sunsets in the 2017 tax law and the 2025 reconciliation law. Both parties have also supported recurring packages of narrower business and individual tax extenders.
The motivations are not always identical. A provision enacted during an emergency may reasonably be temporary because the emergency is expected to end. A narrowly targeted credit may be structured as a trial. Reconciliation provisions may expire because their sponsors cannot assemble the revenue offsets or Senate votes required for permanence. Temporary provisions can also reflect choices among competing priorities within a limited budget package: shortening the duration of several programs allows lawmakers to include more of them while recording only the costs incurred before they expire. Those differences matter when judging the underlying policies.
Nevertheless, both parties have learned the same legislative technique: offer a visible benefit now, record only its cost through the expiration date and leave a future Congress to determine whether the benefit should continue. That can make a policy easier to enact, but it can also conceal its longer-run cost and encourage households and businesses to organize their affairs around a supposedly temporary provision. Neither party has developed a reliable process for financing, evaluating, extending or terminating these policies when the deadline arrives.
The ACA episode shows both the attraction and the danger of this approach. Democrats initially expanded the premium tax credits for 2021 and 2022 as part of the pandemic-era American Rescue Plan. The Inflation Reduction Act subsequently extended them for only three more years, through 2025. At the same time, Democrats chose to devote substantial budgetary resources to climate and clean-energy incentives, prescription-drug changes and other priorities while also presenting the legislation as reducing the deficit.
Democrats therefore made a consequential choice. They could have made permanent premium assistance a higher priority by reducing other parts of the package, raising additional revenue or accepting less deficit reduction. Instead, Democrats extended the credits for only three years while devoting substantial resources to climate and clean-energy incentives and other priorities.
In hindsight, that choice was a serious mistake. A party cannot design major social policy on the assumption that it will remain in power when the expiration date arrives. Making the credits permanent would not have made them impossible to repeal, but it would have changed the political and legislative burden. Opponents would have had to assemble the votes to take an existing benefit away. Because the credits were temporary, opponents needed only to do nothing.
The ACA episode consequently shows that a sunset is not merely an accounting device. It is a transfer of power to a future Congress. Democrats created a benefit on which millions of households came to depend, but they also created the mechanism by which that benefit could disappear automatically. After control of Congress changed, they could not compel another extension. The party that creates a temporary benefit is betting that a future Congress—possibly controlled by its opponents—will agree to continue it. Both parties understand the immediate legislative advantage of that wager. Neither has adequately confronted its fiscal and human consequences when the wager fails.
The 2025 reconciliation law, commonly called the One Big Beautiful Bill, removed much of the uncertainty surrounding the scheduled expiration of the 2017 individual tax provisions. It permanently extended the lower individual income-tax rates and many other features of the 2017 law. But it combined those permanent changes with another collection of temporary benefits.
The law also demonstrated how vulnerable temporary provisions become after political control changes. It terminated or accelerated the expiration of numerous clean-energy incentives created, expanded or extended during the Biden administration. The IRS identified eight consumer, vehicle and building provisions scheduled to end between September 2025 and June 2026, including credits for new and used electric vehicles, residential clean-energy investments and energy-efficient home improvements. Other business and energy incentives were shortened or subjected to earlier phaseouts. Republicans did not have to repeal a permanent Biden-era settlement all at once; they could dismantle policies that already carried expiration dates or whose durability had never become politically established.
Yet the bill created a new set of Republican provisions scheduled to sunset. Most expire after 2028, followed by another significant change in 2030:
· The deduction for qualified tips expires after 2028. This is an income-tax deduction subject to eligibility rules and limits, not a universal exemption of tips from all federal taxes.
· The deduction for qualified overtime compensation expires after 2028. It does not cover every dollar earned by someone who works additional hours; its operation depends on the statutory definition of qualifying overtime compensation.
· The deduction for interest on qualifying car loans expires after 2028. Eligibility depends on the vehicle, final assembly, loan, income and personal-use requirements.
· The additional deduction for eligible taxpayers age 65 and older expires after 2028. Although promoted as relief from taxes on Social Security, it is a separate deduction rather than a repeal of the rules taxing Social Security benefits.
· The federal Trump Account pilot contribution is limited to eligible children born from 2025 through 2028. The underlying account structure is separate from this temporary $1,000 federal deposit.
· The temporarily increased cap on the state and local tax deduction applies through 2029 and is then scheduled generally to return to $10,000 in 2030. Its benefits are geographically concentrated and available only to households that itemize deductions. Its supporters in high-tax states, however, have already demonstrated that they can make the SALT limit central to negotiations over a broader tax package.
The IRS provides additional details on the effective periods and eligibility restrictions for the temporary deductions. IRS: Working Families Tax Cuts—Individuals and Workers
These provisions differ in size, distribution and economic justification. Some may deserve extension; others may not. But each creates a constituency that can describe expiration as a tax increase or a withdrawn benefit: a penalty on tipped or overtime work, a burden on seniors or car buyers, the loss of a financial start for newborn children, or a major tax increase in high-tax states. Current budget projections assume that the provisions will end as scheduled, while political debate is likely to proceed as though allowing them to end would be unacceptable. The argument will therefore focus less on whether each provision is the best use of limited federal resources than on who should be blamed for its expiration.
The timing is particularly unfortunate. Under the 2026 Trustees’ intermediate projections, the Social Security Old-Age and Survivors Insurance fund will deplete its reserves in the fourth quarter of 2032. Continuing income would then cover about 78 percent of scheduled benefits. The combined retirement and disability funds are projected to deplete their reserves in 2034, although combining their finances would itself require legislation. Medicare’s Hospital Insurance fund is projected to deplete its reserves in the second quarter of 2033, after which dedicated revenue would cover about 89 percent of scheduled expenditures.
Avoiding abrupt reductions will require Congress to increase dedicated revenue, reduce the growth of benefits or provider payments, transfer general revenue, authorize additional borrowing, or adopt some combination of those approaches.
Congress will also face significant procedural obstacles. Social Security cannot be changed through reconciliation because Section 310(g) of the Congressional Budget Act specifically excludes it. A Social Security agreement would therefore ordinarily have to pass through the regular legislative process and attract the 60 Senate votes needed to overcome a filibuster. Medicare is not categorically excluded from reconciliation, although the Byrd Rule can prevent the inclusion of provisions whose budgetary effects are merely incidental to their broader policy purposes. A comprehensive solution involving both programs will almost certainly require bipartisan support.
The outcome of failing to reach such an agreement is difficult to predict. Congress could permit severe benefit or provider-payment reductions, with potentially serious consequences for poverty, access to medical care and economic growth. Alternatively, it could rely heavily on general revenue and additional borrowing, increasing interest costs and the risk of bond-market disruption. The temporary tax provisions are small compared with these entitlement shortfalls, but their expirations will consume revenue, political attention and negotiating capacity just as the much larger Social Security and Medicare decisions become unavoidable.
Both parties rely on sunsets because they make present legislation easier, but an expiration date neither finances a permanent policy nor provides a credible plan for ending it. It merely transfers the decision—and its political and fiscal risks—to future taxpayers, beneficiaries and members of Congress. The convergence of the 2028–2030 tax expirations with the approaching Social Security and Medicare shortfalls will test how long Washington can continue treating a deadline as a substitute for a decision.
Some background material:
Joint Committee on Taxation, List of Expiring Federal Tax Provisions, 2025–2035:
https://www.jct.gov/
Social Security Administration, 2026 Trustees Report materials: https://www.ssa.gov/OACT/TR/
Centers for Medicare & Medicaid Services, 2026 Medicare Trustees Report materials: https://www.cms.gov/oact/tr/
Internal Revenue Service, Working Families Tax Cuts guidance: https://www.irs.gov/newsroom/one-big-beautiful-bill-provisions
U.S. Senate Budget Committee, explanation of the Byrd Rule:https://www.budget.senate.gov/about/budget-process