Tax Incidence

Tax incidence is the analysis of who ultimately bears the economic burden of a tax, rather than merely who is legally required to remit it. A tax collected from a business may affect consumers through higher prices, workers through lower wages, or owners through reduced returns. Within economics, incidence analysis connects taxation to changes in economic equilibria and the distribution of real income. It therefore differs from an accounting exercise that assigns tax payments solely to the parties named in legislation. (nber.org)

Statutory and economic incidence

Statutory incidence identifies the person or organization legally responsible for paying a tax to the government. Economic incidence identifies the people whose purchasing power or welfare declines after adjustment. The movement of a burden away from the statutory taxpayer is called tax shifting; tax pass-through measures how tax changes affect prices. Forward shifting commonly refers to higher selling prices, while backward shifting refers to lower payments to production inputs. (eml.berkeley.edu)

In the standard competitive model, an otherwise identical tax produces the same equilibrium whether collected from buyers or sellers. Both arrangements create a wedge between the price buyers pay and the net price sellers receive. This equivalence assumes that participants respond to tax-inclusive incentives and that changing the collection arrangement does not introduce other relevant differences. (eml.berkeley.edu)

Competitive markets and elasticity

The basic microeconomic treatment uses supply and demand in a single market under perfect competition. A per-unit tax $t$ changes market equilibrium so that

where $P_b$ is the buyer’s price and $P_s$ the seller’s net receipt. With downward-sloping demand and upward-sloping supply, buyers generally pay more, sellers receive less, and the quantity traded falls. (eml.berkeley.edu)

The division depends on relative price elasticities, not on which side remits the tax. For a small tax introduced at an initially untaxed competitive equilibrium, let $\varepsilon_s$ denote supply elasticity and $\varepsilon_d$ the absolute value of demand elasticity. The local price-burden shares are

The less elastic side bears more because it has fewer opportunities to change quantity in response to the tax. Perfectly inelastic demand places the price burden on buyers; perfectly inelastic supply places it on sellers. These formulas are local results, not universal shares for large reforms or noncompetitive markets. (eml.berkeley.edu)

For illustration, if supply elasticity is 2 and demand elasticity is 1, the formulas assign two-thirds of a small per-unit tax to buyers and one-third to sellers. A tax of $3 would therefore approximately raise the buyer’s price by $2 and lower the seller’s net receipt by $1.

Market structure and behavioral responses

Under market power, competitive elasticity formulas are insufficient. In monopoly and oligopoly, pass-through also depends on demand curvature, costs, and competitive conduct. A tax can be overshifted, meaning the consumer price rises by more than the tax itself. Thus, price pass-through cannot always be interpreted as a simple division of a fixed tax payment between consumers and producers. (nber.org)

Behavioral economics introduces another qualification: people may respond differently to taxes and ordinary prices. Tax salience describes how noticeable a tax is when decisions are made. A 2009 study found that displaying tax-inclusive grocery prices reduced demand for the affected products. Its theoretical framework showed that statutory incidence can matter when consumers do not fully account for taxes, qualifying the standard buyer–seller equivalence result. (pubs.aeaweb.org)

Labor and capital

A payroll tax creates a wedge between employers’ labor costs and workers’ take-home compensation. In a competitive labor market, its distribution depends on labor supply and demand responses. Empirical findings, however, vary with the tax and institutional setting. A study of U.S. unemployment-insurance taxation found substantial shifting of market-wide taxes to workers, but much less shifting of differences between individual firms’ tax rates. (nber.org)

A separate Finnish study found that higher employer payroll taxes reduced employment without reducing employee earnings. Such results distinguish wage incidence from employment responses and show why an observed burden cannot be inferred solely from a tax’s legal designation. (nber.org)

For corporate income taxation, general-equilibrium analysis follows adjustments across industries and factor markets. Changes in investment allocation and capital accumulation can affect both owners’ returns and future wages. Short-run and long-run incidence may consequently differ; an analysis must specify its adjustment horizon and assumptions about factor mobility and substitution. (nber.org)

Distribution and welfare measurement

Distributional studies assign burdens to households using their consumption patterns and sources of income. Annual-income and lifetime-income classifications can produce different results because people’s earnings change over their lives. Fullerton and Rogers’ 1991 comparison found that consumption taxes appeared less regressive under a lifetime perspective, while lifetime analysis required substantially more longitudinal information. Such findings depend on the taxes and population being studied. (nber.org)

Incidence is distinct from deadweight loss. In standard welfare economics, reductions in consumer surplus and producer surplus include both revenue transferred to government and efficiency losses from changed behavior. Allocating tax revenue burdens therefore does not, by itself, measure the full welfare effects of taxation. Models incorporating imperfect competition or tax salience require additional adjustments to conventional welfare formulas. (nber.org)