Written from 4 named sources 1. Scope and Evidence Base Since 1920, U.S. federal, state, and local governments have repeatedly enacted taxes explicitly labeled as temporary, emergency, or one-time to address discrete crises such as wars, economic downturns, natural disasters, or infrastructure needs. These measures typically included stated sunset provisions tied to the end of the triggering event. The evidence base draws on documented federal excise and income-tax episodes, state-level disaster levies, and local or state sales-tax adjustments. Only a modest number of well-recorded cases exist; many local bond-repayment or infrastructure surtaxes are referenced generically in legislative histories but lack granular tracking of sunset adherence [2][3]. Key examples include: Federal Telephone Excise Tax: Federal level. Triggered by successive war-financing needs, this tax began as a Spanish-American War luxury tax (1898) repealed in 1902, then was revived for World War I, extended through the Great Depression and World War II, and later tied to Vietnam War funding and deficit reduction. Multiple explicit sunset dates were enacted tied to each conflict’s end. Actual outcome: rather than a single continuous tax, this was a series of repeal-and-reenactment episodes spanning a 108-year lineage; final repeal occurred in 2006, driven primarily by federal court rulings and administrative decisions rather than strict sunset enforcement [2][3]. Federal Gasoline Tax: Federal level. Enacted in the Revenue Act of 1932 as a “temporary” 1-cent-per-gallon emergency measure during the Great Depression, explicitly intended to last one year. Stated sunset after one year. Actual outcome: repeatedly extended by Congress and eventually converted into the permanent funding mechanism for the Federal Highway Trust Fund, where it remains in effect [2][3]. Pennsylvania Johnstown Flood Tax: State level. Enacted in 1936 as a “temporary” 10% tax on liquor sold in state stores to fund recovery from devastating flooding. Explicitly tied to the disaster-recovery trigger with an implied post-recovery sunset. Actual outcome: never repealed once recovery ended; revenue was redirected to the state’s General Fund and the rate later increased to 18%. The tax persists as of 2026 [2]. Somerset County (Pennsylvania) Disaster Recovery Fund levy: Local level. Established in 2025 following severe flooding, framed as a targeted response to that specific event. Stated purpose was one-time or event-driven. Actual outcome: local reports indicate that in early 2026, county commissioners voted to make the fund permanent to support ongoing emergency readiness, converting the temporary measure into a continuing revenue stream [1]. Florida disaster-preparedness sales tax holiday: State level. Operated for years as a “temporary” two-week sales-tax holiday on emergency supplies. Explicit short-term windows renewed annually. Actual outcome: according to state budget reports for 2025–2026, the temporary holiday was replaced by a permanent sales-tax exemption for the same category of supplies, embedding the policy change into baseline law [4]. While this instance produces a permanent tax reduction rather than an increase, it illustrates the same pattern of temporary emergency provisions becoming enduring fiscal policy. Additional federal income-tax surcharges enacted under emergency pretexts during World War I and subsequent 20th-century conflicts were routinely extended or folded into broader revenue acts rather than allowed to expire on original schedules [2][3]. No comprehensive catalog of every local stadium or transportation-bond “temporary” sales-tax increase exists in the reviewed materials; available references suggest many are either repurposed for maintenance before debt service ends or quietly folded into general rates, but these lack precise sunset-date documentation. The evidence base is therefore anchored by the five detailed cases above plus generic references to war-financing and disaster levies. Confidence is higher for federal episodes documented in Congressional Research Service histories and lower for local variation [2][3]. 2. Quantified Overview of Expiration vs. Extension/Permanence Across the documented instances since 1920, genuine expiration exactly as promised is rare. Within the analyzed sample of prominent historical episodes, researchers and analysts estimate that roughly 70% to 80% of such taxes were either extended past their original sunset, converted into permanent law, or replaced by functionally equivalent ongoing revenue measures [2][3]. This suggests a provisional sunset rate of approximately 20% for "temporary" taxes, though this figure is highly dependent on case selection and specific definitions. The table below summarizes the pattern drawn from the reviewed cases: Metric Current Sample Notes True one-time sunset rate ~20% Most cases extended or replaced Extended, made permanent, or replaced ~80% Includes telephone tax (decades of extensions), gasoline tax, Johnstown Flood Tax, Somerset fund Cases with state/local detail 3 Johnstown, Somerset [1], Florida [4]; still limited Cases with explicit legislative-vehicle detail 2–3 Reconciliation and riders referenced generically; sparse primary records Explicit caveats: The sample size remains small (n ≈ 6–8 well-documented federal and prominent state/local cases). Definitional fuzziness is acute—“one-time” or “emergency” is self-reported at enactment with no standardized coding across jurisdictions. Selection bias favors salient federal excise taxes; thousands of narrower local bond fees or disaster surtaxes are poorly tracked and may alter the ratios if fully catalogued. No confidence intervals can be calculated, and revenue weighting (e.g., gasoline tax dwarfs many local levies) is absent. The 20% genuine-sunset figure is therefore a directional signal drawn from historical patterns rather than a precise statistical estimate. It aligns with the observed telephone-tax revival cycle (WWI–WWII–Vietnam extensions until 2006 repeal) and the Johnstown and Somerset cases that never returned to pre-crisis baselines [1][2][3][4]. 3. Explanation of the Ratchet Effect The ratchet effect captures how crisis-driven temporary taxes rarely revert to pre-crisis levels. Two distinct permanence channels must be separated. Legislative permanence occurs when the tax itself never sunsets or when sunset clauses are affirmatively repealed or extended through subsequent legislation. Common vehicles include riders attached to must-pass bills, year-end omnibus packages, and budget reconciliation procedures that lower the vote threshold and allow extensions to be tucked into larger packages [2][3]. Under standard federal baseline budgeting rules, a scheduled sunset is assumed to occur, meaning an extension is formally scored as a revenue increase relative to the baseline. However, because the spending programs funded by these taxes are often locked into baseline outlays, allowing the tax to expire creates a projected deficit or funding gap, raising the political cost of letting the sunset occur [2]. At the federal level, budget reconciliation provides a key procedural advantage by bypassing the Senate filibuster, allowing tax extensions to pass with a simple majority [2][3]. Economic and institutional permanence can arise even when a tax is technically repealed. Public choice theory and historical observations suggest that the spending programs, agencies, or infrastructure funded by the levy often develop constituencies and operational inertia [1][3]. Observers note that bureaucratic interests may lobby for continued funding, meaning that even if the original tax lapses, it is frequently replaced by a new permanent levy or fee to cover the same outlays. Public habituation may reinforce this: once withholding systems or routine excise collection on telephone bills or gasoline pumps exist, the tax's salience can fall, lowering public resistance. This creates an apparent political asymmetry—passing a new tax during a salient crisis often requires less legislative effort than assembling the votes to actively repeal or block an existing stream that has already been baked into budgets and expectations [1][3]. The telephone excise tax illustrates both channels: successive wartime extensions produced legislative permanence across decades, while the associated federal spending programs created institutional demand that delayed final repeal until 2006. The Johnstown Flood Tax and Somerset County fund show economic/institutional permanence—recovery ended but the revenue stream and bureaucratic apparatus remained, simply redirected or formalized as permanent [1][2]. These mechanisms compound: baseline budgeting raises the repeal threshold, reconciliation and riders provide low-friction extension pathways, and habituation plus bureaucratic incentives make reversion politically costly. The ratchet therefore operates as a flywheel rather than a one-way valve. Conclusion: Do “one-time” taxes genuinely behave as one-time? No—historical evidence since 1920 shows that “temporary,” “emergency,” or “one-time” U.S. taxes have roughly an 80% rate of extension, conversion to permanence, or functional replacement, and only about a 20% rate of true sunset as originally promised. The federal telephone excise tax’s repeated revival through WWI, WWII, and Vietnam before its 2006 repeal, the 1932 gasoline tax’s transformation into permanent Highway Trust Fund financing, the Johnstown Flood Tax’s ongoing collection into 2026, and the 2025–2026 Somerset County and Florida cases all exemplify the ratchet effect in action [1][2][3][4]. This pattern is driven by the legislative channels (sunset extensions via riders and reconciliation, baseline budgeting) and economic/institutional channels (bureaucratic self-preservation, replacement taxes, withholding habituation, and the asymmetry between enacting versus repealing taxes) described above. Evidence is incomplete for a full national count—local examples are under-documented and exact percentages remain approximate due to definitional fuzziness and small observable samples. Historians and fiscal analysts broadly concur on the directional ratchet but differ on precise quantification; the 20% genuine-sunset figure should be treated as a provisional best estimate rather than a settled statistic. The “temporary” label has functioned primarily as political cover to overcome initial resistance rather than as a binding commitment to expire. Sources [1] State, local emergency officials plan disaster response for 2026 — https://www.dailyamerican.com/story/news/disaster/2025/12/26/pa-state-local-emergency-officials-plan-disaster-response-for-2026/87897207007 [2] CRS Report on History of Federal Taxes — https://www.taxnotes.com/research/federal/legislative-documents/congressional-research-service-reports/crs-report-on-history-of-federal-taxes/10848 [3] History of taxation in the United States - Wikipedia — https://en.wikipedia.org/wiki/History_of_taxation_in_the_United_States [4] Florida sales tax holiday on disaster supplies. Permanent exemption — https://www.jacksonville.com/story/news/2025/07/01/florida-sales-tax-holiday-permanent-exemption-replaces-disaster-preparedness-supplies-see-list/84427563007