To calculate a Section 351 exchange, first confirm that property—not services—is transferred to a corporation solely for stock and that the transferors control the corporation immediately afterward. Then calculate realized gain, measure boot as cash plus the fair market value of nonstock property, apply the liability rules in Section 357, and compute the stock basis under Section 358. Stock-only exchanges generally defer gain; cash or other property can trigger current gain up to the applicable boot amount, while liabilities can create separate recognition when the statutory tests are met.
The central stock-basis formula is: aggregate adjusted basis of property transferred, minus cash and other property received, minus any recognized loss, plus recognized gain and any dividend amount, with the liability adjustments required by Section 358(d). Property received as boot generally takes a fair-market-value basis.
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The calculation at a glance
A practical worksheet should produce four separate results:
- Aggregate adjusted basis transferred: the tax basis of every asset contributed.
- Realized gain: the value of all consideration received, including stock and relevant liability relief, minus the aggregate adjusted basis transferred.
- Recognized gain: the portion taxed in the exchange year. For ordinary Section 351(b) boot, this is generally the lesser of realized gain or boot. Section 357 can change the result for certain liabilities.
- Basis after the exchange: the corporation stock basis under Section 358 and the basis of any cash or other property received.
Do not treat the stock’s fair market value as its tax basis. Section 358 carries the transferors’ historic basis into the stock, then adjusts it for money, other property, recognized gain or loss, dividends, and liabilities.
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First confirm that Section 351 applies
Property must be exchanged for stock
Section 351(a) provides nonrecognition when one or more persons transfer property to a corporation solely in exchange for stock and those transferors are in control of the corporation immediately after the exchange. “Control” is determined under Section 368(c). The statutory rule is: “No gain or loss shall be recognized if property is transferred to a corporation by one or more persons solely in exchange for stock in such corporation and immediately after the exchange such person or persons are in control (as defined in section 368(c)) of the corporation.”
Services are not property for this purpose. A person receiving stock for services may have a separate compensation transaction rather than a qualifying Section 351 property exchange. Identify what each transferor contributed and what each transferor received before doing any basis arithmetic.
Control is tested immediately after the exchange
List all transferors participating in the exchange and determine whether they collectively satisfy the Section 368(c) control requirement immediately after the transfer. A later change in ownership does not replace this immediate-after-the-exchange test. If the control requirement fails, the nonrecognition rules may not apply as expected, so the worksheet should stop until the ownership facts are resolved.
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Stock plus cash or property is still analyzed under Section 351(b)
Receiving money or other property in addition to stock does not automatically destroy the entire exchange. Section 351(b) generally recognizes gain, but only up to the amount of money and the fair market value of other property received. This additional consideration is commonly called boot. Loss is not recognized under the general Section 351(b) rule.
Gather the transaction inputs
Use a separate line for every asset and every form of consideration. Keep amounts tied to the exchange date and identify who supplied each valuation.
| Input | What to record | Why it matters |
|---|---|---|
| Transferred asset | Description and ownership | Different assets can have different bases, values, and attached liabilities. |
| Adjusted basis | Tax basis immediately before the exchange | Used to calculate realized gain and the carryover portion of stock basis. |
| Fair market value | Value on the exchange date | Used to measure total consideration and the value of nonstock property received. |
| Attached liability | Debt or other liability associated with the asset | Relevant to realized gain, Section 357(b), Section 357(c), and Section 358(d). |
| Stock received | Class and fair market value, if determinable | Stock is part of total consideration but is not boot. |
| Cash received | Amount paid to the transferor | Cash is boot under Section 351(b). |
| Other property received | Description and fair market value | Nonstock property is boot and generally receives a fair-market-value basis. |
| Dividend amount | Any amount treated as a dividend under the applicable rules | May increase stock basis under Section 358. |
Use contemporaneous valuation support for property, stock, and liabilities. A basis schedule that omits an attached liability can produce the wrong realized gain, boot, and stock basis even when the ownership analysis is correct.
Step 1: Add the adjusted bases of all transferred property
For each asset, begin with its adjusted tax basis immediately before the exchange. Add those amounts to obtain the aggregate adjusted basis:
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Do not substitute fair market value for basis. Basis reflects the transferor’s tax investment, while fair market value measures economic value. The difference between the two is what creates realized gain or loss.
Step 2: Calculate realized gain
Realized gain measures the economic gain inherent in the transaction, whether or not it is currently taxed. The practical formula is:
Realized gain = total consideration, including stock and relevant liability relief, minus aggregate adjusted basis of property transferred.
Total consideration can include the fair market value of stock, cash, the fair market value of other property, and liability relief that is relevant under the liability rules. If total consideration is below aggregate basis, the transaction has a realized loss. Section 351(b) generally does not recognize that loss merely because boot was received.
Because liabilities can be treated differently under Sections 357 and 358, show them on their own line rather than silently netting them against the asset value. This makes it possible to test both the ordinary boot rule and the liability exceptions.
Step 3: Measure ordinary boot
For Section 351(b), calculate boot without including the stock:
Boot = cash received + fair market value of nonstock property received.
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Section 351(b) states that if an exchange would qualify except for the receipt of money or other property, gain is recognized “but not in excess of” the amount of money plus the fair market value of the other property. Thus, ordinary boot cannot make recognized gain exceed the gain actually realized. If realized gain is smaller than boot, recognized gain is limited to realized gain.
Step 4: Test liabilities under Section 357
Ordinary assumption of liabilities
Assuming a liability generally does not, by itself, prevent Section 351 qualification. Nevertheless, the liability affects the economic consideration in the realized-gain calculation and can reduce the stock basis through Section 358(d). Document which liabilities the corporation assumed, the amount outstanding on the exchange date, and whether the liability was attached to a specific asset.
Section 357(b): tax-avoidance purpose or no bona fide business purpose
Section 357(b) can treat an assumed liability as money received when the principal purpose of the assumption is tax avoidance or there is no bona fide business purpose for the assumption. In that case, the liability is analyzed like boot for gain-recognition purposes. The facts supporting the business purpose should be recorded with the exchange documents; the label placed on the transaction after the fact is not a substitute for those facts.
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Section 357(c) addresses a different problem: liabilities assumed that exceed the aggregate adjusted basis of the property transferred. The excess produces recognized gain under the liability rule. This test is separate from simply asking whether cash or other property was received, so a transaction with no cash boot can still create current gain if liabilities exceed aggregate basis.
For a liability-heavy exchange, calculate the Section 357(c) excess explicitly:
Section 357(c) excess = liabilities assumed − aggregate adjusted basis of transferred property.
If the result is positive, the excess is a required recognized-gain amount under Section 357(c). The final recognized-gain computation must reflect the applicable Section 357 rule as well as any Section 351(b) boot. Because statutory ordering and liability character can matter, unusual or highly leveraged exchanges should be reviewed under the Code and regulations applicable to the transaction date.
Step 5: Determine recognized gain
For an ordinary exchange with cash or other property and no Section 357 override, use:
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Recognized gain under Section 351(b) = the lesser of realized gain or ordinary boot.
Apply the following sequence:
- Calculate realized gain from total consideration, including relevant liability relief, minus aggregate adjusted basis.
- Calculate ordinary boot as cash plus the fair market value of nonstock property.
- Set tentative Section 351(b) recognized gain at the lesser of those two amounts.
- Run the Section 357(b) and Section 357(c) liability tests. A liability treated as money under Section 357(b), or an excess liability amount under Section 357(c), can require recognition beyond a simple cash-and-property calculation.
- Do not recognize a loss under the general Section 351(b) rule merely because the exchange contains boot.
Keep the ordinary boot amount and any Section 357 amount in separate columns. Combining them prematurely makes it difficult to show why gain was recognized and which statutory rule caused it.
Step 6: Compute the transferor’s stock basis
Section 358 and Treasury Regulation Section 1.358-1 provide the controlling framework. Start with the aggregate adjusted basis of the property transferred and make the statutory adjustments:
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minute| Stock-basis adjustment | Effect |
|---|---|
| Aggregate adjusted basis of property transferred | Starting amount |
| Cash received | Subtract |
| Fair market value of other property received | Subtract |
| Recognized loss | Subtract, if a rule actually recognizes one |
| Recognized gain | Add |
| Amount treated as a dividend | Add, when applicable |
| Liability adjustments under Section 358(d) and related provisions | Apply the required reduction or exception |
In compact form:
Stock basis = transferred basis − cash − fair market value of other property − recognized loss + recognized gain + applicable dividend amount, then apply the required liability adjustments.
The liability adjustment is not optional. Section 358(d) treats specified liability relief as money received for basis purposes, subject to the statutory rules and exceptions. Therefore, a stock-basis schedule that stops after subtracting cash and property can overstate basis when the corporation assumes liabilities.
If multiple transferors exchange property, compute each transferor’s stock basis separately. Each person has a different transferred basis, liability allocation, boot amount, and recognized-gain result even when the corporation issues the same class of stock.
Step 7: Assign basis to boot property
Other property received in the exchange generally takes a basis equal to its fair market value on the exchange date. Record that basis separately from the stock basis. Cash has a cash basis equal to its amount, while noncash boot should be identified by asset so later gain or loss calculations use the correct starting basis.
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Do not use the corporation’s historic basis in the distributed property as the transferor’s basis. The general boot-property rule is fair market value at the exchange date.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Worked example: cash and property boot with assumed debt
The following numbers are hypothetical and illustrate the mechanics; they are not a tax result for any particular taxpayer.
| Item | Amount |
|---|---|
| Asset A adjusted basis | $100,000 |
| Asset A fair market value | $220,000 |
| Asset B adjusted basis | $80,000 |
| Asset B fair market value | $80,000 |
| Aggregate adjusted basis | $180,000 |
| Stock received | $250,000 fair market value |
| Cash received | $20,000 |
| Nonstock property received | $30,000 fair market value |
| Liability assumed by corporation | $50,000 |
Realized gain
Total economic consideration is $250,000 of stock + $20,000 of cash + $30,000 of other property + $50,000 of relevant liability relief = $350,000. Subtract the $180,000 aggregate adjusted basis: realized gain is $170,000.
Ordinary boot and Section 351(b) gain
Ordinary boot is $20,000 cash + $30,000 fair market value of other property = $50,000. The tentative Section 351(b) recognized gain is the lesser of $170,000 realized gain and $50,000 boot, or $50,000.
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Section 357(c) check
The $50,000 liability is below the $180,000 aggregate adjusted basis, so it does not create a Section 357(c) excess in this illustration. The transaction still requires the Section 358(d) liability adjustment when stock basis is computed.
Stock basis
Before the liability adjustment, the calculation is $180,000 transferred basis − $20,000 cash − $30,000 other property + $50,000 recognized gain = $180,000. Applying the $50,000 liability reduction required by the applicable Section 358(d) rules produces a preliminary stock basis of $130,000, subject to the exact statutory exceptions and ordering for the transaction.
Boot-property basis
The $30,000 nonstock asset generally has a $30,000 basis because its basis is its fair market value on the exchange date. The $20,000 cash has a $20,000 cash basis.
Comparison of common exchange patterns
| Pattern | Ordinary boot | Liability analysis | Typical tax result |
|---|---|---|---|
| Stock only, no problematic liabilities | None | Confirm Section 357 and Section 358 treatment if any liabilities are assumed | Gain generally deferred if Section 351(a) requirements are met. |
| Stock plus cash | Cash received | Cash is measured directly under Section 351(b) | Gain recognized up to realized gain and the cash amount. |
| Stock plus nonstock property | Fair market value of property | Value the property on the exchange date | Gain recognized up to realized gain and the property’s fair market value. |
| Liability assumed for a bona fide business purpose | Not automatically ordinary boot | Still affects realized gain and stock basis; test Section 357(c) | Usually no qualification failure solely from assumption, but excess liabilities can trigger gain. |
| Liability treated as money under Section 357(b) | Liability amount is treated as money | Principal tax-avoidance purpose or no bona fide business purpose | Current gain can result under the liability rule. |
| Liabilities exceed aggregate adjusted basis | May be no cash or property boot | Section 357(c) excess equals liabilities over aggregate basis | Gain is recognized on the excess under Section 357(c). |
Common calculation errors and how to correct them
- Calling all debt relief boot: Debt assumption is not automatically ordinary Section 351(b) boot. Correct it by running the separate Section 357(b) and Section 357(c) tests.
- Using fair market value as stock basis: Stock basis is determined under Section 358, not by simply copying the stock’s value. Build the schedule from transferred adjusted basis.
- Ignoring liabilities in realized gain: Relevant liability relief can be part of total consideration. Show it explicitly before calculating realized gain.
- Subtracting only cash from stock basis: Subtract the fair market value of other property, add recognized gain, and apply Section 358(d) liability adjustments.
- Recognizing losses because the exchange contains boot: The general Section 351(b) rule recognizes gain, not loss. A loss requires a different applicable rule.
- Using the corporation’s basis for boot property: Other property received generally starts at fair market value on the exchange date.
- Failing to test control immediately after the exchange: Verify the transferors’ control at the required moment, not at a later date.
- Relying on an old template: Apply the Code and regulations in effect for the exchange date. Statutory and regulatory text can change.
Documentation checklist
Retain a worksheet that ties every number to source documentation:
- Adjusted-basis records for each transferred asset.
- Valuation support for transferred assets, stock, and nonstock property received.
- Loan agreements, payoff statements, and schedules identifying liabilities assumed.
- A written explanation of the business purpose for liability assumptions.
- The ownership table showing transferors and post-exchange control.
- The calculation of realized gain, ordinary boot, Section 357(b) treatment, and Section 357(c) excess, if any.
- The final Section 358 stock-basis schedule and separate basis for each boot asset.
Keep the liability and valuation evidence with the exchange agreement. If the transaction is audited years later, the relevant question will be what the facts and values were on the exchange date, not what a later spreadsheet assumed.
When professional review is especially important
Obtain transaction-specific tax advice before filing when liabilities are close to or greater than aggregate basis, when a liability was incurred shortly before the exchange, when the corporation assumes obligations without a clear business purpose, when multiple transferors have different classes of stock, or when part of the consideration is services rather than property. Those facts can change qualification, recognized gain, basis allocation, or the character of the transaction.
The applicable transaction year matters. Section 351, Section 357, Section 358, and Treasury Regulation Section 1.358-1 are the primary authorities for the calculations described here, but statutory and regulatory text can change. Verify the law in effect on the exchange date before completing the return.
Quick Recap
Final worksheet
- Inventory every transferred asset, its adjusted basis, fair market value, and attached liabilities.
- Confirm that property, rather than services, was exchanged for stock and that the transferors satisfy the immediate-after-the-exchange control requirement.
- Add transferred bases to obtain aggregate adjusted basis.
- Add stock, cash, other property, and relevant liability relief to calculate total consideration and realized gain.
- Calculate ordinary boot as cash plus the fair market value of nonstock property.
- Set tentative Section 351(b) recognized gain at the lesser of realized gain or ordinary boot.
- Apply Section 357(b) and Section 357(c) separately to determine whether liabilities create additional recognition.
- Compute each transferor’s stock basis under Section 358, including the Section 358(d) liability adjustment and any dividend amount.
- Assign nonstock property a fair-market-value basis and preserve the valuation and liability records.
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