How DSTs can help investors address potential exchange shortfalls and preserve full tax deferral
A 1031 exchange is not just about selling one property and buying another. To achieve full tax deferral, an investor generally needs to replace the full value of the relinquished property, reinvest all net exchange equity, and replace any debt that was paid off at closing with equal or greater debt or additional cash. If the investor comes up short, the Internal Revenue Service (IRS) may treat that shortfall as boot, which can create current taxable gain even though the transaction is otherwise structured as a 1031 exchange.
For investors selling appreciated real estate anywhere in the country, that matters. In any state that taxes income, capital gains, or gain recognized from a property sale, boot can create a painful and avoidable tax bill. This article uses California for the numeric examples simply as the state-tax illustration. The same exchange principles apply nationally.
This is one reason Delaware Statutory Trusts (DSTs), should often be viewed as a first-line 1031 solution. Under Revenue Ruling 2004-86, the IRS ruled that, under the facts of that ruling, a taxpayer may exchange real property for an interest in a properly structured DST without recognition of gain or loss under Section 1031, assuming the other requirements of the exchange are satisfied.
What “boot” means in a 1031 exchange
In plain English, boot is the part of the exchange where the investor has effectively received value instead of fully rolling that value into qualifying replacement property. The IRS taxes boot because Section 1031 is intended to defer gain only to the extent the taxpayer stays invested in like-kind replacement real estate. If part of the transaction looks like a partial cash-out or debt relief, the IRS generally treats that portion as current taxable gain rather than deferred gain.
The two most common forms of boot are:
- Equity boot, often called cash boot, which usually happens when the investor does not reinvest all exchange equity.
- Mortgage boot, which usually happens when the investor does not replace all debt paid off on the relinquished property and does not offset the shortfall with additional cash.
Equity boot: what it is and why the IRS taxes it
Equity boot usually occurs when the investor does not reinvest all of the net exchange proceeds. If exchange cash comes back to the investor instead of going into replacement property, the IRS generally views that as the investor receiving part of the sale proceeds rather than fully continuing the investment. That is why the shortfall can become currently taxable.
The tax character of that recognized gain depends on the underlying gain in the relinquished property. In real estate exchanges, that can include long-term capital gain and gain attributable to depreciation. One important category investors should understand is unrecaptured Section 1250 gain, which is generally the portion of gain attributable to prior depreciation on real property and is taxed federally at a maximum 25% rate rather than the usual 20% maximum long-term capital-gains rate.
Mortgage boot: what it is and why the IRS taxes it
Mortgage boot usually occurs when debt paid off on the relinquished property is not replaced on the replacement side and the investor does not contribute enough new cash to offset the reduction. The IRS treats relief from debt as a form of value received by the exchanger. In practical terms, if the investor walks away from the old liability but does not replace it with new debt or equivalent cash, the IRS may treat that shortfall as current gain.
This is why many exchangers are surprised by tax even when they think they “bought enough property.” The purchase alone is not the full test. If the debt stack shrinks and the investor does not make up the difference, mortgage boot may still be created.
Assumptions used in the examples below
The examples below use California simply as the state-tax illustration. The same exchange principles are relevant nationally. The California assumptions are used because California taxes capital gains as ordinary income and because affluent exchangers often face the highest state brackets there. The tables below assume a high-income taxpayer already in the top tax brackets, using:
| Tax assumption used in examples | Rate |
| Federal Capital Gains Tax | 20.0% |
| Federal Depreciation Recapture Tax (Section 1250) | 25.0% |
| California tax rate used in examples | 13.3% |
(Disclaimer: The rates above are hypothetical assumptions used for educative and illustrative purposes only and do not represent actual tax advice or guaranteed results. Actual tax rates may vary. Investors are requested to consult with a tax professional regarding their specific situation.)
The 13.3% California rate reflects the top 12.3% California income-tax rate plus the additional 1% tax on taxable income above $1 million. California taxes capital gains as ordinary income.
Example 1: equity shortfall creates cash boot
Assume an investor sells a property and has $3,000,000 of exchange equity available after debt payoff and closing costs. The investor completes replacement purchases but reinvests only $2,500,000, leaving $500,000 unplaced.
For illustration, assume the recognized gain consists of $300,000 of long-term capital gain and $200,000 of unrecaptured Section 1250 gain.
| Example 1: Equity shortfall | Amount |
| Net exchange equity available | $3,000,000 |
| Equity reinvested | $2,500,000 |
| Equity not replaced | $500,000 |
| Federal Capital Gains Tax at 20% on $300,000 | $60,000 |
| Federal Depreciation Recapture Tax (Section 1250) at 25% on $200,000 | $50,000 |
| California tax at 13.3% on $500,000 | $66,500 |
| Approximate total current tax | $176,500 |
(Disclaimer: The above table is a hypothetical illustration intended for illustrative and educational purposes only. It does not represent actual results or tax advice. Investors are requested to consult with a tax professional regarding their tax liabilities.)
That $500,000 shortfall can become taxable cash boot because the investor effectively pulled value out of the exchange instead of keeping it fully invested in qualifying replacement property.
Example 2: debt shortfall creates mortgage boot
Assume an investor sells a property with $2,000,000 of debt being paid off. The investor reinvests all equity but takes on only $1,200,000 of new debt and does not add new cash to make up the difference. The debt shortfall is $800,000.
For illustration, assume the recognized gain consists of $300,000 of long-term capital gain and $500,000 of unrecaptured Section 1250 gain.
| Example 2: Debt shortfall | Amount |
| Debt paid off on relinquished property | $2,000,000 |
| New replacement debt | $1,200,000 |
| Debt not replaced | $800,000 |
| Federal Capital Gains Tax at 20% on $300,000 | $60,000 |
| Federal Depreciation Recapture Tax (Section 1250) at 25% on $500,000 | $125,000 |
| California tax at 13.3% on $800,000 | $106,400 |
| Approximate total current tax | $291,400 |
(Disclaimer: This table is a hypothetical illustration intended to show how a debt shortfall may impact an exchange. It does not represent actual tax or investment advice. Investors are requested to consult with a tax professional regarding debt planning.)
This example shows why debt planning matters just as much as equity planning. A debt shortfall can create a very real tax bill even when the investor believed the exchange was otherwise complete.
Why DSTs are often the cleanest solution
DSTs are versatile because they can help address the exact problems that create boot.
Some DST offerings are structured as all-cash / no-debt investments, which can be used to absorb exchange equity. Other DST offerings include replacement debt, which can be used to help satisfy debt-replacement requirements. Investors can use one DST or a basket of DSTs to more precisely match both the equity and debt needs of the exchange. The legal reason DSTs can be used this way is Revenue Ruling 2004-86, which is the IRS ruling that supports properly structured DST interests as qualifying replacement property under Section 1031.
That flexibility is exactly why DSTs are considered a primary 1031 solution for investors who want precision, speed, passive ownership, and cleaner tax execution.
How a DST may address equity boot
Assume the same facts as Example 1. The investor has $500,000 of exchange equity left over after the primary replacement-property allocation is complete. Instead of taking that money out and creating taxable cash boot, the investor allocates that $500,000 into a suitable DST.
| Equity shortfall solution | Without DST | With DST |
| Leftover exchange equity | $500,000 | $500,000 |
| Amount treated as taxable cash boot | $500,000 | $0 |
| Federal Capital Gains Tax at 20% | $60,000 | $0 |
| Federal Depreciation Recapture Tax (Section 1250) at 25% | $50,000 | $0 |
| California tax at 13.3% | $66,500 | $0 |
| Approximate current tax | $176,500 | $0 |
(Disclaimer: The above table is a hypothetical illustration intended to show how a DST may be used to address an equity boot. It does not represent tax advice or imply performance. Investors are requested to consult with a tax professional regarding equity boot.)
When the DST is a qualifying replacement property and the exchange is otherwise structured correctly, the DST allocation may eliminate the equity shortfall that created the boot problem.
How a DST may address mortgage boot
Assume the same facts as Example 2. The investor needs to replace an $800,000 debt shortfall. Instead of accepting mortgage boot, the investor allocates exchange proceeds into a DST that includes sufficient replacement debt to fill that gap.
| Debt shortfall solution | Without DST carrying replacement debt | With DST carrying replacement debt |
| Debt shortfall | $800,000 | $800,000 |
| Amount treated as taxable mortgage boot | $800,000 | $0 |
| Federal Capital Gains Tax at 20% | $60,000 | $0 |
| Federal Depreciation Recapture Tax (Section 1250) at 25% | $125,000 | $0 |
| California tax at 13.3% | $106,400 | $0 |
| Approximate current tax | $291,400 | $0 |
(Disclaimer: The above table is a hypothetical illustration intended to show how a DST may be used to address a mortgage boot. It does not represent tax advice or imply performance. Investors are requested to consult with a tax professional regarding mortgage boot.)
When the DST is qualifying replacement property and provides sufficient replacement debt within a properly structured exchange, the DST allocation may help reduce the debt shortfall that created the mortgage boot problem.
The bottom line
Boot is the part of a 1031 exchange where the investor has effectively received value instead of fully rolling that value into qualifying replacement property. If exchange equity is not fully replaced, cash boot may be triggered. If debt is not fully replaced, mortgage boot may be triggered. In either case, current taxable gain can result.
DSTs may help in addressing these problems in a way that is often cleaner, faster, and more precise than other options. They may absorb leftover exchange equity, provide replacement debt, and eliminate the shortfalls that would otherwise create taxable boot.
Orvida Investment Advisors is a Registered Investment Advisor that specializes in advising real estate owners on Delaware Statutory Trusts (DSTs), 1031-eligible securities, and other passive real estate investment strategies used in connection with a 1031 exchange. We help investors evaluate DST offerings for replacement debt, replacement equity, projected income, liquidity limitations, sponsor quality, and overall exchange fit so they can pursue more complete and tax-efficient 1031 strategies. If you are selling appreciated investment real estate and need strategic guidance on DST investments, 1031 replacement securities, or passive 1031 exchange solutions, Orvida Investment Advisors provides specialized advice in these complex real-estate securities decisions.
Important Disclosure
This article is for educational purposes only. It does not constitute tax, legal, or investment advice. Section 1031 rules are technical and fact-specific. DSTs are private placement securities available only to appropriate investors. DSTs involve risk, including illiquidity and possible loss of principal. Projected income and tax deferral outcomes are not guaranteed and are subject to individual circumstances. No performance is implied. Investors should consult their own tax, legal, and financial advisors before making any exchange or investment decision.
