The Economics of Deferral

It measures the effective tax rate that deferral produces, explains the options that a realization system gives investors and what section 1031 adds to them, examines lock-in and incidence, confronts the combination of section 1031 and the basis step-up at death, and considers deferral when prices are rising. The illustrations are simplified. They ignore transaction costs, depreciation, and state taxes unless stated, and their purpose is to show direction and magnitude, not to model any client's position.

3.1 Effective tax rate under indefinite deferral

A measure. The effective tax rate on an investment compares its return before tax with its return after tax. It equals one minus the ratio of the after-tax rate of return to the pre-tax rate of return. Ling and Petrova use the same measure, computed on internal rates of return, in their model of commercial real estate.¹

An illustration. Consider an investment of $1,000,000 in land that appreciates 6 percent a year, owned by an investor who pays tax at a combined rate of 25 percent on gain when it is recognized, the rate used in 1.4. Under a tax that reached appreciation as it accrued, the investor would keep 4.5 percent a year, an effective rate of 25 percent. Under a realization tax, the result depends on how long the investor waits.

The pattern is the point. The effective rate falls as the holding period lengthens, because the postponed tax compounds in the investor's favor. An investor who wants to change properties every five years would, without section 1031, bear the effective rate of a five-year holder, 22.9 percent, however long the investor remains in real estate. With exchanges, the same investor bears the effective rate of a thirty-year holder, 13.6 percent, and bears none if the chain ends at death with a basis step-up (3.5).

Depreciable property. For a building the picture is less favorable to the exchanger. The replacement property's lower basis produces lower depreciation deductions, and the deferred recapture is eventually taxed at the rates that apply to it (Chapters 36 and 37).² Barker, Ling, and Petrova, modeling commercial real estate with those effects included, estimate the incremental present value of an exchange at under 1 percent to about 8 percent of property value.³ In the 2015 model, a moderately taxed investor who expects to exchange at each disposition has an effective tax rate of about 23 percent over a nine-year holding period, and the rate rises when exchanges are assumed to be unavailable.⁴

3.2 Option value and the timing election

Realization as an option. A realization-based tax gives investors a choice about when gains and losses are taxed, and the choice has value. The economics literature treats this timing option as a central feature of capital gains taxation, with consequences for when investors trade and for asset prices.⁵ An investor can realize losses while deferring gains, can time realizations to years of lower rates, and can avoid realization entirely by holding until death.

Section 1031 is mandatory, but using it is a choice. When its conditions are met, section 1031 applies whether or not the taxpayer wants it (9.6).⁶ For real estate sold in the ordinary way, however, whether the conditions are met is largely within the seller's control. A seller who structures the sale as an exchange, typically by engaging a qualified intermediary before closing and identifying replacement property on time, can defer. A seller who closes an ordinary sale cannot. The mandatory rule therefore operates as an election in practice, and the familiar asymmetry follows: sellers with gains exchange, and sellers with losses sell outright and recognize the loss.

An option to wait and see. The deferred exchange adds a second option. Between the sale and the end of the identification period, the taxpayer can search for replacement property and decide whether to go forward. If the exchange fails because no suitable property is found, the gain is recognized, and in qualifying cases it is reported under the installment method when the taxpayer receives the proceeds, which may be in the following year (Chapter 44).⁷

The option can lose value. Deferral exposes the taxpayer to future rates. Gain that would be taxed at today's rates may be taxed later at higher ones. A recent budget proposal would have taxed the long-term capital gains of taxpayers with taxable income above $1 million at ordinary rates, and together with separate proposals to raise the top ordinary rate and the net investment income tax rate, it would have produced a top marginal rate of 44.6 percent on such gains.⁸ The value of deferral depends on expectations about rates as well as on the time value of money, and an investor who expects rates to rise may rationally prefer to recognize gain now.

3.3 Lock-in, asset mobility, and allocative efficiency

Lock-in. Because realization triggers tax and holding does not, an investor with accrued gain has a reason to keep an asset that would otherwise be sold. The phenomenon has a long literature.⁹ Feldstein, Slemrod, and Yitzhaki, using individual tax return data, found that sales of corporate stock are quite sensitive to tax rates and that the realization of capital gains is even more sensitive.¹⁰ Later work has examined how lock-in affects equilibrium returns and the pattern of returns over long horizons.¹¹ The concern is not new to section 1031. Treasury's economists trace the provision's origin in part to the lock-in produced when World War I financing raised the top income tax rate from 7 percent to 77 percent.¹²

Mobility within real estate. Section 1031 relieves lock-in for a real estate investor who wants to change properties. The evidence summarized in Chapter 63 associates exchanges with shorter holding periods, and respondents to an industry-sponsored survey expected holding periods to lengthen substantially if exchanges were repealed (63.2).¹³ To the extent owners can match properties to their skills and plans more readily, the stock of real estate is used more productively.

Lock-in to real estate. The same provision creates a different lock-in. Gain can be deferred only by reinvesting in real property, so an investor who wants to move capital out of real estate into a business or securities faces a tax that an investor moving between properties does not. The debate over repeal has framed the two effects as an asset-specific lock-in that section 1031 reduces and an asset-type lock-in that it creates.¹⁴ Which effect dominates is an empirical question the literature has not answered (63.5). Auerbach's broader analysis of capital gains taxation discusses distortions of this kind and the policies available to lessen them.¹⁵

Efficiency. The allocative case for section 1031 is therefore conditional. If the gains from mobility within real estate outweigh the distortion toward real estate as an asset class, the provision improves allocation compared with a realization tax that lacks it. If not, it holds capital in real estate that would be better used elsewhere. A tax that reached gains as they accrued would remove both effects, at the costs of valuation and liquidity described in 1.1.

3.4 Incidence: who actually captures the deferral benefit

Statutory and economic incidence. The deferral belongs by law to the exchanger. Who ends up with its value depends on the market. When a tax advantage attaches to owning a particular kind of asset, competition among buyers can capitalize the advantage into the asset's price and transfer its value to sellers. The capitalization of fiscal differences into property values has been studied empirically for decades.¹⁶

Three candidates. The benefit can stay with the exchanger, pass to the seller of replacement property through a higher price, or pass to tenants through improved space or lower rents.

The price evidence points toward sellers. Exchange buyers have been found to pay premiums in the Phoenix apartment market, in a large sample of commercial apartment and office sales, and in Indiana farmland. In the commercial sample, the average premium generally exceeded the value of the deferral itself, which the authors attributed to the exchanger's weak bargaining position under the exchange deadlines.¹⁷ On the other side of the farmland market, a model of exchanges on the urban periphery explains why sellers of agricultural land who exchange tend to receive replacement properties of lower market value.¹⁸

Whether any benefit reaches tenants has been modeled rather than observed. The 2015 industry-funded study concluded that repeal would require prices to fall or rents to rise for investors to earn their required returns, a result that depends on assumptions about the marginal investor and the supply of space.¹⁹

Implications. If part of the benefit is capitalized into prices, it accrued to those who owned real estate when the capitalization occurred, and later buyers who pay the premium receive less than the headline value of deferral. Repeal would impose a corresponding loss on owners through lower prices, which is one reason transition matters in any reform (64.1). The same analysis means that the tax expenditure figures in Chapter 62 measure revenue forgone, not who benefits, and neither official estimator publishes a distribution of the benefit (63.5).

3.5 The section 1031 plus section 1014 sequence and the "exemption in effect" critique

The sequence. Property acquired from a decedent generally takes a basis equal to its fair market value at the date of death.²⁰ An owner who exchanges repeatedly and dies holding the last replacement property passes it on with the entire deferred gain, and the depreciation recapture accumulated along the chain, eliminated. In the illustration in 3.1, the effective tax rate of such a chain is zero. Chapter 46 describes the planning built on this result.

The critique. Critics argue that the sequence turns a deferral provision into an exemption for many of the taxpayers who use it. Johnson argued that most gain not recognized in an exchange is never taxed, relying on research on capital gains generally that suggested only a minority of unrecognized gain is eventually taxed.²¹ The critique is strongest in its structural form. Section 1031 does not create the step-up, which applies to any asset held until death. What section 1031 adds is the ability to reshape a real estate portfolio repeatedly without leaving the path to the step-up. Without it, each change of property would realize gain. With it, a portfolio can be actively managed for decades and still be treated at death as if it had never been sold.

The response. Defenders make three points. The industry-funded 2015 study found that most exchange replacement properties resold within its data window were sold in taxable sales, although that finding does not reach property held until death (63.2).²² The estate tax may reach the property's value at death, but only for estates above the basic exclusion amount, which is $15 million for decedents dying in 2026.²³ And the step-up is a feature of the rules for property passing at death, not of section 1031, so the objection is properly directed at section 1014.

Measurement. The magnitude is uncertain. The Joint Committee estimates the exclusion of capital gains at death at $379.3 billion for fiscal years 2025 through 2029, and the carryover basis of gifted property at a further $68.1 billion, but it does not separate the share attributable to property that passed through exchanges (62.2).²⁴

The policy response. Proposals to treat death as a realization event would end the sequence for gain above their exclusions (64.5). Until something like that is enacted, the combination remains the most important economic fact about section 1031 for a taxpayer who does not intend to sell.

3.6 Deferral under inflation and under a realization-based system

Nominal gains. The income tax measures gain in nominal dollars, and basis is not adjusted for inflation. Treasury's description of a comprehensive income tax treats the failure to take account of inflation in measuring depreciation and capital gains as a tax penalty, and the Joint Committee staff likewise assumes, for administrative feasibility, that a normal income tax would not index basis.²⁵ Part of what the Code taxes as gain on real estate held for a long period is therefore the effect of inflation on the asset's price.

An illustration. Return to the land in 3.1, and suppose that inflation is 3 percent a year, so the land's real return before tax is about 2.9 percent. Measured against that real return, the effective tax rates are much higher.

A nominal rate of 25 percent becomes an effective rate of 41 to 50 percent on the real return for an investor who is taxed annually or sells within a decade. Deferral is the main thing that brings it down.

Deferral as a rough offset. The interaction gives section 1031's defenders an argument that its critics must meet: deferral partly offsets the overtaxation of real returns that nominal measurement produces. The argument is imprecise. The size of the offset depends on the holding period rather than on the rate of inflation, and it shelters real gain along with inflationary gain. Indexing basis would address inflation directly, and a system with indexing would have less need for deferral on this ground.

Deferral within a realization system. Deferral is not an anomaly in a realization-based income tax. It is the default for every asset that is held, and section 1031 extends it through transactions that would otherwise end it. The alternatives are the ones Chapter 1 described: tax accrued gain annually, at the cost of valuation and liquidity, or tax realized gain without exception, which intensifies the lock-in described in 3.3. Section 1031 is one of the ways the Code manages the tension between those alternatives, and Part XII examines how well it does so.