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1031 Exchange Debt Replacement: New Debt, Added Cash, and DST Allocations

By Jerry Baker

Debt replacement is the part of a 1031 exchange that deals with the mortgage or other debt paid off when you sell your property. You may address that amount with debt on the replacement property, added cash, or a mix of both; you do not always need a new loan. The full calculation also considers the property you buy, proceeds you reinvest, cash you receive, and qualifying exchange expenses.

What does debt replacement mean?

Suppose your rental sells for $2 million and the closing agent pays off an $800,000 mortgage. Ignoring costs for a moment, $1.2 million remains for your exchange. That is the cash you can see in the exchange account. It is not the full value of the property you sold.

The mortgage payoff still matters. In an exchange, relief from a liability can count as money received for tax purposes. The rules allow certain offsets, including replacement debt and cash you contribute. That is the reason people talk about replacing debt. It is a planning shorthand for the liability calculation, not a rule that says you must borrow the same amount again. [1]

I start with separate lines for equity, debt, and total value. Mixing those figures makes a good plan look short or a short plan look complete. Once the numbers are clear, we can compare investments that fit them. Your CPA should confirm the tax calculation, and your qualified intermediary should confirm how the exchange funds will move.

Keep three numbers separate

Exchange equity is the cash available to reinvest after the loan payoff and closing adjustments. It is not necessarily your taxable gain. A property can have substantial equity and a high tax basis, or little remaining equity and a low basis.

Debt relieved is the liability addressed in the exchange calculation when you dispose of the old property. The final mortgage payoff provides a starting point. Your tax preparer must sort out principal, accrued interest, fees, and any unusual debt terms instead of assuming every dollar on the payoff statement is the same thing.

Replacement value is the value of the qualifying real property you receive. For a simple purchase, cash plus qualifying debt helps explain how you fund that value. Closing costs, reserves, personal property, and offering expenses can require separate treatment. Neither a bank balance nor a sales brochure substitutes for the final exchange worksheet. [1]

For the examples below, assume the properties qualify, the exchange meets all deadlines, and the investor follows the required exchange process. Also assume no closing expenses, no other property, and enough realized gain for the stated boot to matter unless an example says otherwise. These are illustrations, not instructions for a particular tax return.

Three ways to address the old debt

Return to the $2 million sale, $800,000 loan payoff, and $1.2 million of exchange equity. Here are three possible funding plans for a $2 million replacement purchase.

Funding planExchange cashNew cashReplacement debt
Use debt$1,200,000$0$800,000
Use cash$1,200,000$800,000$0
Use both$1,200,000$300,000$500,000

Each plan funds the same $2 million purchase. In the second and third plans, added cash offsets debt relief. IRS guidance specifically allows cash paid in the exchange to reduce the amount treated as received from relief of liabilities. It does not require a replacement mortgage dollar for dollar. [2]

The economic choices differ. A cash purchase uses more money you could have kept available elsewhere. A loan leaves more of that money outside the property, but adds debt payments and lender risk. A combination may strike a workable balance. The tax goal does not decide which choice fits your life.

Added cash must actually go into the transaction in the proper way. A plan to contribute money later is not the same as funding the purchase by the required deadline. Before closing, confirm the amount, account, wiring process, and ownership with the people handling your exchange.

What happens if you do not replace enough?

Suppose you reinvest all $1.2 million of exchange cash and take on $600,000 of replacement debt, with no added cash. You buy $1.8 million of qualifying property. The old debt was $800,000, so the simplified liability shortfall is $200,000.

That shortfall can create taxable boot. Boot is money or nonqualifying value received in an otherwise qualifying exchange. It can include net debt relief even if no extra cash arrives in your checking account. A partial exchange can still defer part of the gain; the presence of boot does not by itself mean every dollar of gain becomes taxable. [1]

Boot is also not the tax bill. If the example produces $200,000 of recognized gain, the resulting tax depends on the kind of gain, tax rates, state rules, and your circumstances. If the realized gain were only $120,000, the ordinary boot calculation would not create $200,000 of gain. Special recapture rules and other issues still need review.

I would rather compare a clear partial-exchange plan with a clear full-deferral plan than force a poor investment to fit a tax target. Sometimes accepting some tax leaves an investor with a better mix of risk and available cash. That decision belongs in a side-by-side discussion with the investor and tax adviser.

More debt does not erase cash you keep

There is an important limit to the debt-and-cash discussion. Added cash can offset net debt relief. Extra replacement debt does not, by itself, wipe out cash boot you receive. The IRS calculation keeps cash received separate from the liability offset, which cannot fall below zero. [1] [3]

Take the same sale. You use $1.1 million of the exchange proceeds, receive $100,000 in cash through a properly structured transaction, and buy a $2 million replacement with a $900,000 loan. The larger loan covers the old $800,000 debt. It also supplies the extra $100,000 needed to fund the purchase.

Yet you still received $100,000. The fact that the replacement property costs $2 million does not make that receipt disappear. Under the simplified assumptions, the cash can produce recognized gain up to $100,000, limited by realized gain. That is why “buy equal or greater value” is useful shorthand but not a complete tax calculation.

This example is not permission to take money out of your intermediary account whenever you want. Exchange agreements limit your rights to receive or control the funds. An improper receipt may raise a larger qualification problem. Arrange any planned cash receipt with your QI and CPA before the transaction, not after a wire has gone out. [2]

How debt can work in a DST allocation

In a qualifying Delaware statutory trust structure, an investor may be treated as owning a proportionate interest in the underlying real estate for federal income tax purposes. Revenue Ruling 2004-86 explains this treatment for the trust arrangement described there. It does not say every trust labeled “DST” qualifies. [4]

A leveraged DST may therefore supply allocated property debt along with the cash investment. The allocation comes from the offering and ownership terms; it is not a personal cash advance for you to spend. Confirm the cash subscription, allocated debt, and recognized exchange value in the offering documents and closing records.

For a simplified illustration, assume the investor's exchange value consists only of equity plus allocated debt. If an offering uses 40% debt against that value, the equity share is 60%. A $300,000 cash allocation then corresponds to $500,000 of exchange value and $200,000 of allocated debt.

The arithmetic is $300,000 divided by 0.60, which gives $500,000. Subtract the $300,000 equity to find $200,000 debt. Multiplying $300,000 by 40% would give $120,000, which is the wrong denominator for this example. The percentage applies to total value, not to the investor's cash alone.

Before using that formula, ask what the quoted LTV measures. A lender may use an appraised value or a property purchase price. An offering may use total investor cost, which can include a markup or expenses. Those figures can differ. For exchange planning, use the documented investor debt allocation and the value confirmed for your exchange, not an unrelated marketing percentage.

A portfolio can combine different debt levels

You do not necessarily need the same LTV in each replacement investment. For a qualifying exchange into several properties or DSTs, review the totals and the separate facts for each investment. Your identification and closing requirements still apply to the whole plan.

Here is a hypothetical allocation using $1.2 million of equity. These figures assume that the stated percentages use the same equity-plus-debt definition and that the offerings support the allocations shown.

InvestmentCash equityAllocated debtExchange value
DST A: 0% LTV$400,000$0$400,000
DST B: 50% LTV$400,000$400,000$800,000
DST C: 50% LTV$400,000$400,000$800,000
Total$1,200,000$800,000$2,000,000

The overall LTV is $800,000 divided by $2 million, or 40%. It is not the simple average of 0%, 50%, and 50%, which is about 33.3%. The correct portfolio ratio weights each investment by its value. Equal cash allocations do not create equal property-value allocations when debt levels differ.

The table addresses the simplified $800,000 debt target. It does not establish that any of the three investments is suitable. Two loans with the same LTV can have very different rates, maturity dates, reserve needs, and operating risks. I want to understand those differences before treating a spreadsheet total as a solution.

What if the figures change before closing?

A worksheet should show its date and the documents behind it. Suppose an investment was expected to provide $200,000 of allocated debt, but the final subscription provides $190,000 for the same cash amount. The plan is now $10,000 short of its earlier debt estimate. That difference deserves review even if the change seems small beside a multimillion-dollar exchange.

Do not solve it by editing the old spreadsheet to show the number you hoped to receive. Ask whether you can add cash, adjust an allocation among eligible identified properties, or accept the tax result. Each choice depends on the remaining time and the actual transaction. An investment that has closed may no longer be adjustable.

Keep both the original plan and the final records. Mark which figure changed, why it changed, and who confirmed the new amount. That short record helps your CPA reconcile the exchange without guessing whether a difference came from debt, fees, or a mistaken entry.

Debt changes the investment as well as the exchange

Consider a $1 million property with $400,000 of debt and $600,000 of equity. If the property value falls to $800,000 while the debt stays unchanged, the equity falls to $400,000. The property lost 20% of its value; the equity lost about 33.3%. This illustration ignores cash flow, expenses, and loan repayment.

Leverage can also magnify a gain. It is not a free way to fill the debt line on an exchange worksheet. A lender must still be paid according to the loan agreement, and sale proceeds available to investors depend on what remains after debt and other obligations.

Review when principal comes due, whether the rate can change, and whether the loan amortizes. A low payment today may leave a large balance at maturity. Ask what happens if rents are lower or sale financing is harder to obtain. Review guarantees and exceptions to nonrecourse terms rather than treating “nonrecourse” as a promise that your investment is safe.

DST structure adds another reason to read carefully. The favorable trust treatment in Revenue Ruling 2004-86 depends on restricted trustee powers, including limits related to refinancing the acquisition debt. Do not assume the manager can simply replace the loan the way an owner of a directly held property might. A proposed change in structure needs its own legal and tax analysis. [4]

Costs and tax basis need their own review

A $2 million contract price rarely means the exchange account receives exactly $1.2 million after an $800,000 payoff. There may be commissions, title charges, prorations, deposits, reserves, or other settlement items. Their tax treatment is not identical.

IRS Form 8824 instructions account for exchange expenses. That does not mean every cost listed at closing qualifies as an exchange expense. Have your preparer classify the charges and your QI confirm the funding. Keep an updated worksheet showing both the amount to reinvest and the cash needed outside the exchange. [1]

Also distinguish a loan payoff from debt cancellation. These examples assume the old lender receives the amount owed; they do not address a lender forgiving an unpaid balance. A short sale, foreclosure, or forgiven debt can require a different analysis, including the nature of the loan and possible cancellation-of-debt income. Those facts need their own review before you use a routine exchange illustration. [2]

Debt replacement also does not create a fresh tax basis equal to the new property's price. A like-kind exchange generally carries deferred gain into the replacement property through the basis rules. IRS Publication 551 explains the adjustments for cash, liabilities, recognized gain, and additional costs. [5]

In a simple full-deferral example, you sell for $2 million with a $700,000 adjusted basis and acquire a $2 million replacement. Ignore expenses and all special issues. The $1.3 million realized gain is deferred, so the replacement basis remains $700,000. The mortgage payoff and new loan do not erase that gain or make the full $2 million depreciable.

Land, buildings, carried-over basis, and additional basis may require separate records and depreciation treatment. Your cash distribution and your taxable income may also differ. Get the completed basis schedule after the exchange; keep it with the closing documents for the eventual sale or next exchange.

A practical workflow before you choose investments

First, establish the sale figures. Use the expected closing statement and current loan payoff. Label estimates as estimates. A planning number can change when closing moves or a charge is added, so identify who will provide the final numbers.

Next, ask the CPA to calculate the target. Review adjusted basis, gain, exchange expenses, equity, debt relief, and any planned cash receipt. If full deferral and partial deferral are both options, compare the estimated tax results as well as the money left available afterward.

Then, compare actual investments. Record cash needed, documented debt, total exchange value, minimum investment, status, and closing requirements. Include your own added cash if that is part of the plan. Review concentration, income assumptions, fees, and loan risk alongside the tax totals.

Finally, confirm and reconcile. Availability can change before funding. Ask for current figures and a backup approach while there is still time. After closing, reconcile what you acquired against what you planned and give the final records to the preparer completing Form 8824.

In a standard deferred exchange, replacement property must generally be identified within 45 days. Receipt must occur by the earlier of 180 days or the relevant tax return due date, including extensions. A debt shortfall discovered late does not create more time. Have the QI and tax adviser confirm your exact dates and any applicable relief. [1]

Frequently asked questions about debt replacement

Do I have to take out the same mortgage again?

No. Replacement debt is one way to address liability relief. Added cash used in the exchange can also provide an offset, or you can use both. Reinvesting enough value and handling the proceeds correctly still matter. Your CPA should calculate the complete transaction rather than treating the old loan balance as a standalone borrowing requirement.

Why does the debt matter if I paid it off at closing?

The payoff used part of the property's sale value. It did not reduce the transaction to only the cash left over. IRS basis guidance expressly includes debt paid off in a deferred exchange, while the gain rules address relief from liabilities. The payoff, net proceeds, expenses, and replacement funding need to appear in the same review.

Can I buy an all-cash DST after selling a property with debt?

Potentially. You could add enough outside cash, combine the all-cash investment with qualifying investments that provide debt, or accept a partial exchange after reviewing the tax cost. An all-cash DST alone does not supply replacement debt. The final plan must satisfy the other exchange rules and fit your financial circumstances.

Does nonrecourse DST debt count differently from a personal loan?

Personal responsibility and the tax treatment of a liability are separate questions. Form 8824 instructions address both recourse and nonrecourse liabilities. A qualifying DST may allocate underlying debt without giving you a personal spending account or requiring the same loan process as a direct purchase. Confirm the actual debt allocation, documents, and tax treatment for the offering.

Can a larger replacement loan offset cash I withdraw?

Not simply because the loan is larger. The net-liability calculation cannot create a negative amount that cancels cash received. Cash boot remains a separate part of the analysis. Also, unauthorized access to exchange funds can raise qualification issues beyond the amount of the withdrawal. Plan any receipt with your QI and tax adviser before it happens.

What is the right LTV for my exchange?

There is no universal percentage. Start with the exchange figures and any outside cash you are willing to use. Then review actual debt allocations and property values. Portfolio LTV is total debt divided by total value, not an unweighted average of investment percentages. The right funding plan also depends on the loans, properties, and risks you can accept.

Is a debt shortfall taxed dollar for dollar?

A shortfall may create recognized gain; it is not itself a dollar-for-dollar tax charge. The recognized amount is generally limited by realized gain under the boot rules, with other rules potentially affecting the result. Federal and state tax calculations follow. Ask your preparer to show the estimated gain, tax, and remaining deferred gain separately.

Use debt as a planning input, not the sole reason to invest

The debt figure helps define the exchange problem. It does not identify the best property or manager. A plan that meets every number on the worksheet can still have loan terms, a hold period, or a risk level you do not want.

I would start with accurate sale figures, compare debt and cash choices, and then look at the investments that can support the plan. Your QI handles the exchange process, your tax adviser confirms the tax result, and the investment review addresses what you will own. Each part deserves attention before you commit.

Sources and references

  1. Internal Revenue Service. Instructions for Form 8824 (2025). 2025 instructions, current page read October 6, 2026.Relevant sections: Deferred Exchanges; lines 15, 15a, and 18–25; recourse and nonrecourse liabilities; examples. Accessed October 6, 2026.
  2. Internal Revenue Service. Publication 544 (2025), Sales and Other Dispositions of Assets. 2025 publication, current page read October 6, 2026.Relevant sections: Like-Kind Exchanges; Partially Nontaxable Exchanges; Assumption of liabilities; actual/constructive receipt; foreclosure and debt cancellation. Accessed October 6, 2026.
  3. Internal Revenue Service. Sales, Trades, Exchanges 4. Current IRS FAQ read October 6, 2026.Relevant sections: Answer on reporting exchanges, liability relief, cash and liability offsets. Accessed October 6, 2026.
  4. Internal Revenue Service. Revenue Ruling 2004-86: Classification of a Delaware statutory trust. 2004 ruling; official text read October 6, 2026.Relevant sections: Revenue Ruling 2004-86, Facts, Analysis, and Holdings: proportionate ownership, trustee powers, and debt restrictions. Accessed October 6, 2026.
  5. Internal Revenue Service. Publication 551 (12/2025), Basis of Assets. December 2025 revision, current page read October 6, 2026.Relevant sections: Like-Kind Exchanges of Real Property; exchange expenses versus other settlement items; Partially Nontaxable Exchange and debt paid off. Accessed October 6, 2026.

Educational information, not an offer or a personal tax, legal, or investment recommendation. Examples are hypothetical and omit stated adjustments. Tax treatment depends on your facts and current law. Review your transaction with your CPA, attorney, and qualified intermediary. Real estate investments can lose value and may be illiquid.

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