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The 1031 Napkin Test: Estimate Cash, Debt, and Replacement Value

By Jerry Baker

The 1031 napkin test is a quick way to estimate the cash and replacement-property value needed for an exchange. It compares your sale, allowable exchange expenses, debt, and proposed purchases to flag a possible shortfall. It is a planning shortcut, not an IRS form or proof that your exchange qualifies.

Start with two questions

Before looking at a long list of properties, I want to know how much cash you have to invest and how much replacement value you need to acquire. Those are different numbers. Confusing them can send a property search in the wrong direction.

For a straightforward exchange seeking full deferral, the usual starting goal is to reinvest the net exchange proceeds and acquire enough qualifying replacement value. Debt paid off at the sale remains part of the analysis. You can address that part with qualifying new debt, additional cash, or both.

The underlying law concerns an exchange of qualifying real property and the treatment of money, other property, and liabilities. It does not create a separate safe harbor called the napkin test. Use the shortcut to organize a conversation with your qualified intermediary and tax adviser, then have them work through the actual transaction. [1]

Put these figures on the page

Start with the sale price. Below it, list estimated allowable exchange expenses. On separate lines, record the loan payoff, cash expected to reach the qualified intermediary, and any other closing adjustments. Put a date beside each estimate.

On the replacement side, list the value you will acquire, exchange cash used, new debt, and extra cash you plan to contribute. Keep personal money separate from proceeds already held in the exchange. The source of a dollar can matter even when the total purchase price is unchanged.

Also record your adjusted tax basis, if known, but do not mix it into the cash budget. Basis helps calculate gain. It is not a pile of money available at closing.

A lender payoff statement, estimated settlement statement, prior depreciation schedule, and proposed replacement closing figures are useful inputs. A remembered purchase price and a rough mortgage balance are a much weaker starting point.

A simple starting example

Assume you sell investment property for $2 million. For illustration, assume $100,000 of costs are allowable exchange expenses and the outstanding loan payoff is $700,000. Assume no other credits, prorations, cash withdrawals, or nonqualifying property.

The initial target is therefore $1.2 million of exchange cash deployed into at least $1.9 million of qualifying replacement value. The other $700,000 could come from new debt, extra cash, or a mix, subject to the actual exchange rules.

These are hypothetical planning figures. The tax adviser must confirm which costs belong in the calculation. IRS Publication 544 explains that qualifying exchange expenses affect amount realized and recognized gain; not every charge on a closing statement receives that treatment. [2]

Why the mortgage payoff still matters

It is natural to think the old loan is irrelevant once escrow pays it off. You no longer owe the lender. But the tax calculation still accounts for the debt from which you were relieved.

In a like-kind exchange, certain liability relief is treated as money received. Qualifying liabilities taken on and cash paid can offset that relief under the applicable rules. The calculation looks at the whole exchange, not simply the check remaining after the old lender is paid. [3] [4]

In the example, investing only the $1.2 million into an all-cash replacement would leave a $700,000 difference from the simplified $1.9 million target. That difference needs review. It does not vanish because the loan was paid rather than transferred to the new property.

Write “debt paid off” instead of just “debt” on the worksheet. That small label helps keep the old transaction separate from a loan you may choose for the new one.

Three ways to fund the same target

Using the same example, a $1.9 million replacement could be funded in three straightforward ways. Each assumes all $1.2 million of exchange cash is properly applied and the properties and transaction otherwise qualify.

The financing choices produce the same simplified replacement value. They produce different personal cash commitments and financial risks. A tax target should not be confused with a recommendation to borrow.

Compare the actual loan terms, cash left outside the exchange, expected expenses, and ability to handle a downturn. A plan that uses every available dollar may satisfy the worksheet while leaving too little flexibility for the rest of your life.

Why replacement price alone is not enough

Now assume the investor still buys $1.9 million of qualifying replacement property but uses only $1.1 million of exchange cash. The new loan is $800,000, and $100,000 of exchange proceeds is paid to the investor.

The replacement value matches the starting target. Yet the investor received cash. Increasing the replacement debt does not automatically cancel cash received in the exchange.

The regulations and Form 8824 examples illustrate this asymmetry: excess liabilities taken on can offset liability relief, but they do not simply erase separately received cash. The tax calculation must distinguish those categories. [4] [3]

This is why I would keep two checks on the page: replacement value and use of exchange cash. A single large “purchase price” number can hide what happened underneath it. Ask the CPA to trace any cash paid to you, rather than assuming a larger mortgage solves the issue.

Proceeds are not the same as gain

Suppose the original property in our example has an adjusted basis of $600,000. The assumed amount realized, after the $100,000 allowable expenses, is $1.9 million. The simplified realized gain is $1.3 million.

That is different from the $1.2 million of cash reaching the exchange. One number describes gain; the other describes available cash after the loan payoff. Reinvesting only the gain is not the standard full-deferral test for a 1031 exchange.

Likewise, getting back what you originally paid is not automatically a tax-free cash withdrawal during an exchange. The rules for money received do not let you simply label the first dollars as your original investment. [1] [2]

Keep three labels visible: exchange cash, realized gain, and recognized gain. Recognized gain is the portion currently taken into account under the tax rules. A calculator becomes much easier to misuse when it calls all three “profit.”

How a partial exchange can look

Assume the investor chooses a $1.7 million replacement using the full $1.2 million of exchange cash and $500,000 of new debt. Compared with the $700,000 old loan payoff, there is a simplified $200,000 net debt reduction.

If the exchange otherwise qualifies, the basic boot calculation may recognize $200,000 of the $1.3 million realized gain. The other $1.1 million could remain deferred under these assumptions. This example excludes special recapture rules and other adjustments.

“Boot” is a common term for money or other non-like-kind value received, including certain net liability relief. It is not the tax bill itself. The amount of gain recognized, its character, applicable rates, and other return items determine the tax. [2] [3]

A partial exchange may be a deliberate choice. Compare the actual after-tax outcomes rather than buying another property solely to make a shortfall disappear. The investment still needs to make sense.

Not every closing cost reduces the target

The $100,000 expense assumption does a lot of work in our example. It should not be treated as permission to subtract every seller charge from the reinvestment target.

Publication 544 distinguishes exchange expenses from such items as property taxes, rent prorations, security deposits, and repairs. Some closing entries reflect income, operating costs, liabilities, or other adjustments. Their treatment needs separate analysis. [2]

Ask the tax adviser to mark each line on the proposed settlement statement. Then reconcile the marked statement with the amount that will actually reach the intermediary. A cash balance can be correct while the tax categories used to explain it are wrong.

Do the same on the purchase side. Loan charges, reserves, prepaid items, and other amounts can have different purposes. The fact that escrow pays them does not settle whether they count as qualifying replacement value or an exchange expense. Avoid deducting the same charge twice.

Use dollars before percentages

Loan-to-value, or LTV, describes debt divided by the relevant value. In the basic replacement plan, $700,000 divided by $1.9 million is about 36.84%. That is a result of the assumed dollars, not a universal required LTV.

Changing the amount of extra cash changes the debt needed. An investor who adds $700,000 can pursue the same simplified target without a loan. An investor buying more replacement property might have a different LTV even with the same dollar amount of debt.

Also check what “value” means in a quoted ratio. A lender may use an appraisal or acquisition price. An offering may present a different measure based on its investor price and allocated debt. Do not plug one ratio into a formula that assumes another denominator.

Start with confirmed cash, debt, and value for the interest you would actually acquire. Use percentages to compare those figures after the dollar amounts tie out.

Using the test with a DST

A qualifying Delaware statutory trust interest can be treated as ownership of the underlying real estate for federal tax purposes. Revenue Ruling 2004-86 reaches that conclusion for the particular trust and restrictions it describes. The label “DST” alone does not establish that every trust or exchange qualifies. [6]

For a proposed DST purchase, request the exact cash subscription, allocated debt, and exchange value for your interest. Confirm the date of those figures and whether any fees or reserves need separate treatment.

Do not add the entire property's loan to your personal worksheet. You need the amount associated with the fractional interest you are acquiring. Nor should you assume your exchange value equals the sponsor's original property purchase price.

I would reconcile the sponsor's allocation with the intermediary and CPA before closing. That keeps a useful planning estimate from being mistaken for the final exchange calculation.

Combining several replacement interests

A replacement plan can involve more than one qualifying investment. For illustration, suppose the investor deploys the $1.2 million of exchange cash across three interests. Assume the stated values and debt amounts are accepted for this simplified analysis.

The totals are $1.2 million cash, $700,000 debt, and $1.9 million value. Aggregate LTV is about 36.84%. Averaging the three individual percentages without weighting them would give a different and misleading answer.

This arithmetic does not establish proper identification, availability, eligibility, or suitability. The identification rules still apply, including limits governing multiple properties. Have the intermediary review what must be identified; three investment names do not automatically resolve how underlying properties are counted. [5]

The shortcut does not test investment quality

The worksheet can show that a property fills an exchange gap. It cannot tell you whether the price is reasonable, rents will be collected, expenses are realistic, or a loan can be repaid.

For a private offering, examine the business plan, manager, fees, conflicts, financial information, and restrictions on selling. SEC guidance cautions that private placements can involve substantial loss, limited disclosure, and long periods without liquidity. A Form D filing is not SEC approval. [7]

A $100,000 shortfall is a tax-planning question. It is not a reason to assume any available $100,000 interest is a good purchase. The same is true when selecting leverage just because its amount fits.

I would rather put the investment concerns beside the exchange math. That way, you can see both the potential tax result and the risks you would own after the deadline has passed.

The shortcut does not test every tax rule

Even matching all the planning numbers does not prove full deferral. The old and new interests must qualify, the intended use matters, and the transaction must be structured as an exchange. Related-party rules or a change in tax ownership can require further work. [1]

Separate recapture rules may also create current ordinary income. Form 8824 instructs taxpayers to check certain depreciation and natural-resource recapture provisions in addition to its basic money-and-liability calculation. A replacement of sufficient total value does not by itself answer those questions. [3]

Flag mixed-use property, equipment, prior cost-segregation deductions, mineral interests, seller financing, and changes in entity ownership for specific review. This article's simplified examples do not calculate those situations.

The point of the shortcut is to make the next conversation more useful. It should reveal missing information, not hide it behind a green checkmark.

Your calendar is a separate check

For a typical deferred exchange, replacement property must be identified within 45 days. Receipt must occur by the earlier of 180 days after the transfer or the applicable tax-return due date, including extensions. Both periods run from the relinquished transfer; the 45 days are part of the exchange period. [1]

The regulation specifies midnight deadlines, but that does not mean a bank, title company, sponsor, or intermediary can complete work at midnight. Set an earlier practical schedule for signatures, funding, and confirmation. Confirm any relief separately rather than assuming a closed office extends a statutory deadline. [5]

A portfolio draft is not the required signed identification delivered or sent to a permitted recipient. Nor is a subscription request proof that an interest has been acquired.

Keep the deadline sheet beside the financial worksheet. A plan must satisfy both; extra replacement value cannot repair an untimely identification.

Turn the estimate into a closing plan

Before the sale closes, arrange the exchange structure and ask the intermediary how proceeds will move. Taking unrestricted receipt of the full sale consideration and later purchasing a property generally does not create a deferred exchange. The qualified-intermediary safe harbor has agreement and access restrictions. [5]

Once the final sale statement is available, replace estimates with actual figures. Update the loan payoff, approved expenses, exchange cash, and any adjustments. If the cash differs from the original plan, revisit the replacement amounts while changes are still possible.

Before each purchase, request its final cash requirement and debt allocation. Record what has closed, what remains pending, and the balance at the intermediary. Avoid counting a reserved interest as completed.

After the last closing, reconcile the documents with the CPA's Form 8824 calculation and replacement basis. Save that work for future tax returns. The napkin starts the discussion; the final records carry it forward.

Mark what is still unknown

Give each number a source and a status. For example, “loan payoff: lender estimate through Friday” is more useful than a bare amount. A later closing date could change accrued interest and the final wire.

Use three columns: estimated, confirmed, and needs an answer. Put the name of the person checking each open item beside it. This makes it easier to tell the difference between a funding gap and a figure that simply has not been updated.

Do not round away a small remaining balance just because the page is only a rough plan. Ask how the last dollars will be handled before authorizing the final purchase or release.

Frequently asked questions

Is the napkin test an IRS-approved exchange method?

No. It is a planning shortcut for organizing proceeds, expenses, debt, and replacement value. The actual transaction must satisfy Section 1031 and other applicable rules. Passing a simple arithmetic check does not establish that the property, structure, timing, or tax treatment qualifies. [1]

Do I only need to reinvest my profit?

No. For a straightforward full-deferral plan, review net exchange proceeds and replacement value rather than just gain. In the example here, exchange cash is $1.2 million and realized gain is $1.3 million. They describe different parts of the transaction and cannot be used interchangeably.

Must my new loan equal the loan paid off?

Not necessarily. Additional cash can address a debt-replacement need under the applicable rules. In the simplified example, $700,000 of extra cash replaces the assumed $700,000 loan requirement. The amount and source of funds still need review with the full exchange calculation. [3]

Can a larger mortgage let me keep exchange cash tax free?

Not automatically. Excess new liabilities do not simply offset cash separately received. Review cash boot and liability relief as distinct parts of the calculation. The Form 8824 examples show why an equal or larger replacement price does not alone settle the result. [4]

Does a shortfall make the whole exchange taxable?

Not always. An otherwise qualifying exchange may be partly taxable, with recognized gain generally limited by the applicable boot and realized-gain rules. Special recapture and other provisions can change the result. Ask the CPA to calculate the actual recognized amount and its tax character. [2]

Can I combine DSTs with another replacement property?

A plan may include multiple qualifying interests, provided the ownership, identification, timing, and other exchange requirements are met. Add their actual exchange cash, debt, and value amounts. Then review the overall investment risks and property-count rules rather than relying on the totals alone. [5]

What if I do not know my adjusted basis?

You can begin a cash-and-value planning sheet, but you cannot reliably calculate gain or the tax from a partial exchange without basis. Gather acquisition, improvement, depreciation, and prior-exchange records. Mark the basis as unresolved rather than entering the current mortgage balance or guessing.

What should I bring to the first conversation?

Bring the estimated sale statement, current loan payoff, ownership information, expected closing date, and any replacement ideas. Add your tax-basis records when available. Explain how much outside cash you could contribute and how much debt you are comfortable owning. Those facts turn a rough calculation into a useful planning discussion.

Sources and references

  1. U.S. Congress, reproduced by Cornell Legal Information Institute. 26 U.S.C. §1031 — Exchange of real property held for productive use or investment. Current statute read October6,2026.Relevant sections: Subsections(a)–(f): qualified real property, timing, boot, basis and related parties. Accessed October 6, 2026.
  2. Internal Revenue Service. Publication544 (2025), Sales and Other Dispositions of Assets. 2025return edition currently published; operative portions read October6,2026.Relevant sections: Like-Kind Exchanges, Exchange Expenses, Partially Nontaxable Exchanges, Assumption of Liabilities. Accessed October 6, 2026.
  3. Internal Revenue Service. Instructions for Form8824 (2025). 2025return edition currently published; read October6,2026.Relevant sections: Lines15–25, expense/liability mechanics, Taylor/Finley illustration and special recapture checks. Accessed October 6, 2026.
  4. Office of the Federal Register / Treasury Department. 26CFR1.1031(d)-2 — Treatment of assumption of liabilities. Current eCFR operative example read October6,2026.Relevant sections: Example2: assumed liabilities offset old liabilities but not separate cash received. Accessed October 6, 2026.
  5. Office of the Federal Register / Treasury Department. 26CFR1.1031(k)-1 — Treatment of deferred exchanges. Current through October5,2026; read October6,2026.Relevant sections: Paragraphs(a),(b),(c),(g)(4),(g)(6): exchange not subsequent purchase, statutory midnight, identification and funds access restrictions. Accessed October 6, 2026.
  6. Internal Revenue Service. Revenue Ruling2004-86 — Delaware statutory trust classification and Section1031. Published2004 ruling; operative analysis read October6,2026.Relevant sections: Analysis pages11–14: limited trustee powers, undivided grantor-trust asset ownership and conditional1031 result; no blanket DST approval. Accessed October 6, 2026.
  7. U.S. Securities and Exchange Commission, Investor.gov. Private Placements under RegulationD — Updated Investor Bulletin. Updated September21,2026; read October6,2026.Relevant sections: Risk considerations, limited disclosure, illiquidity and FormD not approval. 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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