The Fiscal Tightrope: Why Taxing Savings, Not Subsistence, Is the Only Path to Sustainable Public Finance

Introduction

There is a persistent illusion in public finance that governments can tax their way to prosperity. The temptation is understandable: raising rates on existing bases appears faster and politically simpler than cultivating new economic activity. Yet a growing body of theoretical and empirical evidence suggests that this illusion is not merely costly, but actively self-defeating. When policymakers tax beyond the margin of savings, when they extract revenue from households struggling to cover basic needs, and when they treat small and medium enterprises as cash cows rather than growth partners, they do not merely slow economies; they erode the very tax base upon which future budgets depend.

This blog post examines four interconnected realities that every finance minister must confront: the theoretical case for limiting taxation to savings rather than subsistence; the counterproductive nature of taxing poverty and the strategic importance of small and mid-size taxpayers; the capacity of growth-friendly environments to generate fiscal surpluses without rate hikes; and the sobering real-world consequences when taxes consume the income that should feed, house, and warm a population.

1. The Uncomfortable Arithmetic: Taxation Should Fall on Savings, Not Subsistence

The foundational insight of modern optimal taxation theory is as elegant as it is politically inconvenient: in an ideal system, taxes should distort only the intertemporal margin—that is, they should affect what would otherwise be saved, not what is consumed to survive. Frank Ramsey’s 1927 formulation of the optimal commodity tax problem established that tax rates should be inversely related to the price elasticity of demand, minimizing deadweight loss by leaving relatively undistorted those goods for which consumption is most necessary and least responsive to price changes. The original Ramsey rule, as discussed in Mankiw, Weinzierl & Yagan (2009),¹ established that uniform taxation does not maximize utility; rather, a tax scheme should reduce the production of all taxed commodities in the same proportion with respect to the benchmark case of prices equal to marginal costs. Yet Ramsey himself recognized the catch: necessities tend to have low elasticity, meaning his rule, taken literally, would impose the highest rates on the goods the poor need most.

The theoretical resolution to this tension came later, through the seminal work of Chamley (1986)² and Judd (1985),³ who demonstrated that in a dynamic Ramsey problem with infinitely lived households, the optimal tax on capital income converges to zero in the steady state. As detailed in a comprehensive NBER working paper by Abel (2007),⁴ the intuition is powerful: taxing capital income is equivalent to imposing an ever-increasing tax on future consumption relative to present consumption, creating an intertemporal distortion that compounds over time and severely penalizes the savings that fund investment. In practical terms, this literature delivers an uncomfortable message to policymakers. If the goal is to raise revenue with minimal economic damage, the tax system should lean toward consumption taxation that exempts or zero-rates basic necessities, while avoiding the double taxation of savings and investment income. When governments instead impose heavy taxes on labor and capital simultaneously, they do not merely reduce the after-tax return to saving; they shrink the pool of domestic investment, lower long-run productivity, and ultimately constrain the wage growth that sustains income tax receipts.

The political economy of this prescription is admittedly difficult. Voters rarely rally for abstract efficiency. Yet the empirical costs of ignoring it are substantial. Research on the Laffer curve dynamics, as reviewed in Mankiw, Weinzierl & Yagan (2009),¹ confirms that once an economy approaches the vertex of the Laffer curve, further rate increases become counterproductive, reducing both output and collections. The broader implication is that every government occupies a specific point on a nonlinear revenue surface; crossing the threshold transforms a tax from a source of funding into an engine of avoidance, evasion, and capital flight. When policymakers tax too much—when they reach into the portion of income that would have been productively saved and reinvested—they trigger a contraction that harms both private welfare and public budgets.

2. The Poverty Trap: Small and Mid-Size Taxpayers Are Allies, Not Enemies

If the theoretical literature warns against taxing savings, the applied literature on development and informality delivers an equally urgent warning: do not tax poverty. Across the global South, the poorest households are increasingly net payers into fiscal systems that were ostensibly designed to finance their uplift. The Commitment to Equity (CEQ) Handbook, edited by Nora Lustig, provides a comprehensive methodological framework for measuring this phenomenon.⁵ In a working paper for ECINEQ,⁶ Lustig demonstrates that in Armenia, Bolivia, Ethiopia, Ghana, Guatemala, Honduras, Sri Lanka, and Tanzania, the headcount ratio measured with the international poverty line is higher for consumable income than for market income—meaning fiscal policy actively increases poverty. A UN DESA background paper⁷ confirms this startling result: in Ethiopia, Ghana, Guatemala, Nicaragua, Uganda, and Tanzania, the Consumable Income headcount ratio exceeds the Market Income headcount ratio, primarily because of high consumption taxes on basic goods.

The consequences extend beyond equity. When the state extracts resources from survivalist operators without delivering tangible public services in return, it undermines the social contract and encourages further informality.⁶⁷ Heavier taxation accelerates the shift into the shadow economy, where workers remain vulnerable and governments collect nothing. The evidence from Bamako to Bangkok suggests a common pattern: when presumptive taxes and daily license fees fall on vendors who earn below formal income tax thresholds, the fisc gains pennies while losing the formalization dividend of future growth.

The flip side of this tragedy is the underappreciated role of small and medium enterprises (SMEs) as fiscal allies. In the European Union, SMEs represent two-thirds of employment and generate nearly 57 percent of total value added in the non-financial business sector.⁸ Yet a European Commission JRC study reveals a disturbing pattern: micro and small firms face a sharp increase in their corporate tax burden as they grow out of the micro category, while medium and large firms enjoy lower effective rates.⁸ A prior European Commission empirical study found that medium-sized enterprises virtually do not benefit from SME tax incentives in most EU countries, and that investments financed by equity capital face higher effective tax burdens than those financed by debt—placing SMEs at a competitive disadvantage since they typically face greater difficulty obtaining loans.⁹

This is not merely a European problem. Across Africa, SMEs face punitive tax environments, with bureaucratic delays and presumptive taxes that formal operators cannot absorb. When governments treat small and mid-size taxpayers as easy targets—presumptive taxes, multiple local levies, and compliance costs that large firms can absorb but small ones cannot—they do not merely extract revenue; they sterilize the entrepreneurial dynamism that expands the future tax base. The evidence from both Bamako and Barcelona suggests a common principle: the path to sustainable revenue runs through the formalization and growth of small enterprises, not their predation.

3. Growth as Revenue: How Improving the Economic Environment Expands Fiscal Space

The most underexploited insight in public finance is that the budget often fixes itself when the environment is right. This is not a naïve supply-side slogan; it is a robust empirical finding across transition economies, emerging markets, and high-growth European jurisdictions. Recent panel analysis of EU-27 countries from 2000 to 2022 confirms that total tax revenue exerts a positive effect on GDP growth, but this relationship is highly sensitive to composition.¹⁰ Social security contributions show a significant negative impact on growth, whereas corporate income tax, personal income tax, and property tax revenues are positively associated with expansion.¹⁰ Crucially, the study finds that government expenditure has a significant negative effect on growth, reinforcing the lesson that a smaller, more efficient state can generate more fiscal room than a larger, distorting one.¹⁰

Countries with the lowest tax burdens in the EU—Ireland at 21.7 percent, Romania at 27.9 percent, and Malta at 28.8 percent—demonstrate that high revenue is not a prerequisite for development finance.¹¹ The Laffer curve literature provides the microeconomic mechanism behind this macroeconomic pattern. Even before the theoretical maximum is reached, the marginal economic damage of higher rates begins to erode the base faster than the higher rate can compensate. Conversely, when countries improve their business environment—reducing regulatory burdens, securing property rights, and streamlining tax administration—they expand the formal sector and increase the productivity of existing taxes without raising rates. A transparent, predictable environment reduces evasion and encourages voluntary compliance, allowing countries to sustain lower tax effort while achieving higher growth.

The policy implication is clear: governments facing revenue shortfalls should first ask whether their economic environment is driving activity into the shadows, not whether rates are high enough. The ILO’s World Employment and Social Outlook: Trends 2022 emphasizes that in developing regions, limited fiscal space compromises progress on social protection, and that informal employment—often driven by punitive tax and regulatory environments—leaves workers particularly vulnerable during crises.¹² A budget is not merely a collection of rates and bases, but a reflection of the underlying economy’s health. Improve the soil, and the harvest of revenue grows organically.

4. When Taxes Eat Survival: Real-World Warnings

Theory and cross-country regressions are abstract until one confronts the household budget in Athens, the market stall in Accra, or the pharmacy in Buenos Aires. When taxes consume the portion of income that should cover food, housing, and medicine, the result is not merely distributional injustice; it is a macroeconomic contraction born of collapsing demand, rising informality, and social instability.

Greece offers the most devastating recent example of a developed economy pushed into this trap. An ESM working paper on the Greek crisis documents how successive indirect tax hikes increased the average household’s indirect tax burden by approximately 30 percent between 2008 and 2013.¹³ VAT reached 23 percent, among the highest in the eurozone, while excises on alcohol, tobacco, and transport fuel nearly doubled. One researcher estimated that the poorest households faced tax increases of 337 percent. The system’s progressivity collapsed: between 2010 and 2017, the tax burden on the bottom income quartile exceeded that of the top quartile, as lump-sum levies and property taxes were imposed to combat evasion by the wealthy. The result was not a revenue bonanza. Tax debts ballooned to 90 percent of annual tax revenue, the worst figure in the industrialized world, while the VAT deficit from evasion alone reached 34 percent. High taxation discouraged transactions, encouraged flight to the informal sector, and deepened a depression that lasted nearly a decade. By 2013, nearly half of Greek children lived in low-expenditure households, up from 21 percent in 2008.¹³

France’s experience with the Impôt sur la solidarité fortune (ISF) illustrates a different but equally instructive failure. Introduced in 1982 and abolished in 2017, the wealth tax triggered substantial capital flight. As Fortune reported, between 2000 and 2017, around 60,000 millionaires left France, taking with them future income tax, VAT, and corporate tax revenues.¹⁴ One estimate put total capital flight between 1988 and 2007 at €200 billion, potentially dragging GDP growth down by an average of 0.2 percent each year. France Stratégie found that the 2017 reform converting the broad wealth tax into a narrower real estate levy (IFI) initially favored the wealthiest households, with the top 5 percent capturing 57 percent of the tax reductions.¹⁵ While the Macron administration’s reform succeeded in modestly reversing departures of wealthy taxpayers, the episode underscores a harsh reality: when taxes are perceived as confiscatory, the mobile capital and talent that drive modern economies simply relocate, leaving behind a narrower base and heavier burdens on those who cannot leave.

In the developing world, the mechanism is often more direct. When governments rely on VAT and excises that include basic goods, the poor pay twice: once as consumers and again as survivors of truncated opportunity. Research on the poverty impacts of revenue systems in developing countries confirms that taxes on kerosene, basic foods, and intermediates are among the most regressive, undermining public subsidies aimed at the poor.⁶⁷ The global cost-of-living crisis has amplified these dynamics. In Turkey, where inflation hit a 24-year high, nearly half of Istanbul residents surveyed could not afford red meat and a third could not buy vegetable oil. In Bangladesh, millions of unemployed workers survive on $32 per month, substituting chickpeas for protein as taxes and tariffs on essentials compound price pressures.

These cases share a common thread. When the tax system reaches into the portion of income that covers basic needs, it does not merely redistribute; it destroys. Households cut consumption of taxed necessities, reducing VAT receipts; they shift into informal work to escape presumptive levies, shrinking the income tax base; and they postpone or forgo investment in health and education, undermining the human capital that drives long-term growth. The fiscal state, in its desperation for immediate revenue, devours the seed corn of future prosperity.

Conclusion

The art of taxation, as Jean-Baptiste Colbert famously observed, consists in so plucking the goose as to obtain the largest possible amount of feathers with the smallest possible amount of hissing. Modern political economy adds a crucial caveat: the goose must also remain healthy enough to grow new feathers. The evidence surveyed here—from the Ramsey-Chamley-Judd theoretical tradition to the recent experiences of Greece, France, and the developing world—points to a coherent set of principles for sustainable public finance.

First, taxes should be designed to fall on the margin of savings and excess consumption, not on the subsistence spending that preserves human dignity and productive capacity. Second, small and mid-size taxpayers, whether formal SMEs in Europe or informal operators in Africa, are not enemies of the fisc but its most important prospective allies; predatory taxation on this segment is a strategy for fiscal decline, not expansion. Third, improving the economic environment—through regulatory efficiency, institutional transparency, and competitive tax structures—expands the base and improves compliance more reliably than raising rates ever could. Fourth, and finally, when governments ignore these principles and allow taxes to consume the income that should feed, house, and warm their populations, the result is not revenue abundance but revenue crisis, not equity but pauperization, and not growth but stagnation.

The uncomfortable fact is that sustainable taxation is a discipline of restraint. It requires policymakers to accept that the state’s share of a shrinking pie is worth less than a modest share of a growing one. For finance ministers tempted by the quick fix of higher rates on vulnerable bases, the experiences of Athens, Bamako, and Paris should serve as cautionary tales. The path to fiscal health runs not through the confiscation of survival, but through the cultivation of an environment in which taxpayers—small and large, poor and wealthy—can thrive, save, and contribute willingly to a common prosperity.

Written with the support of kimi.com.

References