What is the Laffer curve and where does the peak sit?

The short answer

Arthur Laffer popularised the curve in the 1970s with a simple insight: tax revenue is zero at a 0% rate and zero at a 100% rate (no one would work for nothing), so revenue must rise then fall as rates increase. The shape is theoretically uncontroversial. The empirical question is the location of the peak.

The Diamond-Saez (2011) framework, working from elasticity estimates of the top of the income distribution, places the revenue-maximising top marginal rate on labor income at around 70-80%, depending on assumptions about behavioural responses, tax-base elasticity and equity preferences. This is well above the top marginal rates currently applied in most advanced economies, suggesting that for ordinary labor taxation, current rates are typically below — not above — the Laffer peak.

The picture is more complex for capital taxation, where international mobility, asset substitution and the timing of realisations produce higher elasticities and a lower revenue-maximising rate.

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What the data shows

The empirical work on Laffer-type peaks has been one of the more productive areas of public economics over the past two decades.

Key figures (Diamond-Saez 2011, OECD Tax Database, Saez/Slemrod/Giertz 2012):

• Diamond-Saez baseline estimate of revenue-maximising top labor income rate: ~73% (federal+state+payroll combined in US setting)
• Estimated elasticity of taxable income at the top: 0.2 to 0.4 in most advanced-economy studies
• OECD average top statutory personal income tax rate (2024): ~42-46%, well below Laffer-peak estimates
• Top statutory rate in the US 1944-1963: ranged 91-94%; effective top rate substantially lower due to deductions
• Capital income elasticities: typically 0.3 to 0.6, producing lower estimated peaks for capital taxation

The exception worth noting is that the empirical literature distinguishes carefully between the elasticity of reported income — which captures both real behavioural response and tax avoidance — and the deeper elasticity of underlying labor supply. The latter tends to be smaller, suggesting that much of the high-income elasticity reflects responses to tax base and avoidance opportunities rather than fundamental work-effort changes.

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Why it happens — the macro mechanism

The location of the Laffer peak depends on three behavioural channels through which higher rates erode tax revenue.

The labor-supply channel. Higher marginal rates can reduce hours worked, work effort or labor force participation. This is the channel most prominent in popular discussions and in the original Laffer presentation. Empirically, however, labor supply elasticities at the top of the income distribution are surprisingly small — high earners typically have already-high hours and limited intensive-margin response. The labor-supply channel matters more at the lower-middle of the distribution, where participation decisions and hours flexibility are larger.

The tax-base channel. Higher rates increase the value of avoidance — through deductions, deferrals, income recharacterisation, or relocation across jurisdictions. This channel produces high apparent elasticities of taxable income that are not necessarily reductions in real economic activity. Saez, Slemrod and Giertz (2012) document that much of the elasticity in top-income studies comes from this channel rather than from labor-supply changes. This is the angle most underappreciated in popular debates: a high elasticity of taxable income does not necessarily mean rates are above the welfare-maximising point, only that the tax base is leaky.

Note that the tax-base channel is policy-malleable. Closing avoidance opportunities, harmonising rates across asset categories and limiting deductions can shift the empirical Laffer peak upward without changing the underlying real elasticities.

The mobility channel. For very high earners and for capital, the option to relocate to lower-tax jurisdictions becomes empirically important. The European single market and the post-1990 globalisation of capital have raised the mobility elasticity for top earners and for corporate capital, lowering the empirical Laffer peak for these tax bases. The 2021 OECD agreement on a 15% global minimum corporate rate reflects exactly this mobility concern.

Synthesis by regime: in the post-1945 closed-economy regime with limited capital mobility and tight controls on avoidance, top labor and capital rates above 70-90% were not unusual and produced significant revenue. In the post-1990 open-economy regime, tax competition and capital mobility have produced lower equilibrium rates across most jurisdictions, narrowing the practical range of revenue-maximising rates for capital. For labor income with limited cross-border mobility, the academic empirical case for substantially higher rates than currently applied remains defensible.

The Laffer curve is real. The claim that we are on the descending side of it is, for most current rates, harder to support empirically.

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What it means for different economic actors

High-income earners are often the focus of Laffer-curve debates, but the empirical literature suggests their behavioural response is dominated by tax-planning rather than labor-supply margins. The implication is that broad tax-base reform tends to be more revenue-productive than headline rate changes alone.

Capital allocators and corporate treasurers face a Laffer-type problem on the corporate-tax side, where international mobility produces real elasticities. The post-2021 global minimum corporate tax framework was designed precisely to limit the bottom of the corporate Laffer curve, by restoring the ability of jurisdictions to levy meaningful rates without triggering relocation.

Macro analysts and policymakers should resist treating “Laffer effects” as a uniform phenomenon. The empirical answer differs sharply by tax base: labor versus capital, mobile versus immobile capital, and along the income distribution.

A common error is to apply Laffer logic uniformly across all rates and bases. The empirical literature is clear that the effect varies by tax type, by income level, and by the openness of the relevant tax jurisdiction.

Practical observation

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Frequently asked questions

Did the 1980s US Reagan tax cuts pay for themselves?

The empirical consensus, including the CBO, Treasury and most academic public-finance studies, is that the 1981 and 1986 tax reductions did not generate enough additional growth to offset the revenue loss. The combined federal deficit rose substantially in the 1980s and the federal debt-to-GDP ratio increased. The Laffer-type behavioural responses observed were real but smaller than required for self-financing.

How does the Laffer logic apply to corporate taxation?

For corporate tax, mobility elasticities are higher than for labor income, particularly post-1990. This produces a lower estimated revenue-maximising rate, often estimated in the 25-35% range for individual jurisdictions. The 2021 OECD framework with a 15% global minimum was designed to restore the ability of jurisdictions to levy meaningful corporate rates without triggering relocation arbitrage.

Can the Laffer peak shift over time?

Yes, and it has. The peak depends on avoidance opportunities, capital mobility, the international tax architecture and the sophistication of tax administration. Closing loopholes, harmonising international rates and improving enforcement can shift the empirical peak upward; the opposite forces shift it downward. The 1981-2021 period in advanced economies featured downward pressure on the empirical peak; the post-2021 global minimum framework may partially reverse that direction.

Last updated — 21 July 2026