Significant Modification of Debt: Five Tests and Tax Consequences

A significant modification of debt is a change to a loan’s terms that Treasury Regulation 1.1001-3 treats as retiring the old debt and issuing a new one in its place, and it happens whenever the modified terms fail any one of five specific tests: yield, timing of payments, obligor, recourse nature, or collateral and priority. Crossing that line converts a routine restructuring into a taxable exchange, with cancellation-of-debt income possible for the borrower and gain or loss for the lender.¹

First Question: Is There a Modification at All

Before applying any significance test, you have to decide whether a change to the loan counts as a modification. The regulation defines a modification broadly as any alteration of a legal right or obligation, whether documented in writing, agreed orally, or shown by the parties’ conduct.¹

Several things do not count. Rate resets and other adjustments that occur automatically under the original loan documents are generally outside the definition. A truly unilateral option that the loan already granted one party, exercisable without the other’s consent and without meaningful consideration, is usually not a modification either. A missed payment is not a modification, and a lender’s forbearance does not become one until it runs past two years after the initial default, plus any additional time spent negotiating in good faith or in bankruptcy.¹

A short list of changes always counts as a modification, even if the original documents said they might happen: substituting a borrower, adding or removing a co-borrower, flipping recourse to nonrecourse (or the reverse), and converting the debt into something that is no longer debt for tax purposes.²

The Five Tests That Decide Significance

Once a modification exists, you compare the new terms to the terms in place immediately before the change. Fail any of the five tests below and the modification is significant. Each test stands on its own; you do not need to fail more than one.²

Change in Yield

The yield test catches most restructurings. A yield change is significant if the new annual yield varies from the old by more than the greater of 25 basis points or 5 percent of the original yield.² The 5 percent is 5 percent of the existing yield, not 5 percentage points.

On an 8 percent loan, 5 percent of 8 percent is 40 basis points, so the modification is significant if the new yield falls below 7.60 percent or rises above 8.40 percent. On a 3 percent loan, 5 percent produces only 15 basis points, so the 25-basis-point floor controls. Everything that affects yield counts here: the coupon, the payment schedule, fees paid between the parties, and any change in principal.

The bright-line yield test applies to fixed-payment, variable-rate, and alternative-payment-schedule instruments. Contingent-payment debt is tested under a general facts-and-circumstances standard instead.

Deferral of Payments

Pushing payments out is significant when the deferral is “material.” The safe harbor: all deferred amounts must be unconditionally due by the end of a period equal to the lesser of five years or 50 percent of the original loan term, running from the original due date of the first deferred payment.³ On an eight-year loan, the safe harbor is four years. On a 20-year loan, it caps at five.

Unused safe-harbor time carries forward if the parties defer payments again later. A deferral outside the safe harbor is significant even if the dollar total of interest and principal is unchanged, and because deferrals move yield too, one postponement can require running both the deferral and yield tests.

Change in Obligor

Substituting the borrower on recourse debt is automatically significant, with three narrow exceptions:¹

A corporate reorganization in which the acquirer takes the original obligor’s tax attributes under Section 381(a), with no reduced payment expectations and no other significant alteration.
An acquisition of substantially all of the original obligor’s assets, again with no change in payment expectations and no other significant alteration.
Tax-exempt bonds where the new obligor is related to the original and the original collateral continues to secure the instrument.

A bankruptcy filing by itself does not substitute a new obligor, and neither does a Section 338 stock-purchase election.² The rule is looser on nonrecourse debt: swapping the borrower on nonrecourse loans is generally not significant, because the lender’s real credit exposure is to the collateral. That changes if the collateral is replaced or the loan becomes recourse to the new borrower.

Change in Recourse Nature

Flipping recourse to nonrecourse, or nonrecourse to recourse, is significant. It rewrites who bears the credit risk. A legal defeasance releasing the borrower from personal liability is the classic example.³

Two carve-outs apply. Defeasing a tax-exempt bond under its original terms is not significant if the borrower places government securities in trust that are expected to cover all scheduled payments. And changing recourse to nonrecourse is not significant if the original collateral still secures the loan and the lender’s payment expectations are unchanged. When the debt is neither substantially all recourse nor substantially all nonrecourse before or after the change, the analysis reverts to facts and circumstances.

Change in Collateral or Priority

Releasing, substituting, or adding collateral, or changing the loan’s priority against other obligations, is tested through “payment expectations.” The change is significant only if it meaningfully increases or decreases the likelihood that the lender will collect in full, which requires comparing the borrower’s financial condition and the security’s value before and after.

Subordinating a senior loan behind new debt, or releasing valuable collateral without replacement, usually crosses the line. Swapping collateral for property of comparable value and quality usually does not.

How Stacked or Staged Changes Are Tested

You cannot slice a large restructuring into small pieces that each fall below a threshold. Modifications of the same type are aggregated and tested as a single change, and if the combined effect is significant, the deemed exchange occurs at the moment the cumulative line is crossed. For yield changes, modifications more than five years old drop out of the running total.¹

Different types are not aggregated. A yield tweak short of the yield threshold combined with a collateral swap short of the payment-expectations threshold does not become significant just because they happened in the same deal. Each test runs on its own facts. When several changes happen at once, though, you test each one assuming the others have already taken effect.²

What a Significant Modification Costs the Borrower

When the line is crossed, the IRS treats the old debt as retired and a new instrument as issued. The borrower’s first exposure is cancellation-of-debt (COD) income, which arises when the issue price of the deemed new debt is less than the adjusted issue price of the old debt.

Issue Price of the New Debt

How you measure the new instrument’s issue price depends on whether the debt is publicly traded. If a substantial amount trades on an established securities market, the issue price is fair market value on the modification date.⁴ For distressed publicly traded debt, fair market value often sits well below face, which produces a large COD number.

Non-traded debt uses stated principal as the issue price, provided the interest rate meets or exceeds the applicable federal rate (AFR) that the IRS publishes monthly. If stated interest lags the AFR, the issue price drops to an imputed principal amount calculated by discounting future payments at the AFR.⁵

Original Issue Discount

If the new debt’s stated redemption price at maturity exceeds its issue price, the excess is original issue discount.⁴ The borrower deducts OID across the life of the new instrument. That softens the upfront COD hit but spreads the offset over years.

Section 108 Exclusions

Not every dollar of COD income is taxable. Section 108 excludes it in several situations aimed at borrowers already in trouble:⁶

Discharge in a Title 11 bankruptcy case is fully excluded.
Insolvency excludes COD to the extent liabilities exceed the fair market value of assets immediately before the discharge. Property that state law shields from creditors, such as a homestead or retirement accounts, still counts as an asset in that measurement.
Qualified farm indebtedness owed to unrelated lenders is excludable within limits tied to tax attributes and aggregate property basis.
Qualified real property business indebtedness allows non-C-corporation taxpayers to exclude COD on debt secured by real property used in a trade or business, limited to the debt’s excess over the property’s fair market value and capped by the aggregate basis of the taxpayer’s depreciable real property.

The qualified principal residence indebtedness exclusion is a boundary worth flagging: it was available through 2025 and expired for discharges on or after January 1, 2026, unless the arrangement was entered into and evidenced in writing before that date.⁶ Homeowners restructuring in 2026 cannot rely on it for new arrangements.

Attribute Reduction

Section 108 exclusion is paid for through mandatory reduction of tax attributes, dollar for dollar (or 33⅓ cents per dollar for credit carryovers), in this order:⁶

Net operating losses of the discharge year and NOL carryovers
General business credit carryovers (33⅓ cents per dollar)
Minimum tax credit (33⅓ cents per dollar)
Capital loss carryovers
Basis in the taxpayer’s property under Section 1017
Passive activity loss and credit carryovers (credits at 33⅓ cents per dollar)
Foreign tax credit carryovers (33⅓ cents per dollar)

Order matters. A borrower with large NOL carryforwards loses those first, which can wipe out deductions the business was counting on. An election to reduce basis before NOLs is available in some cases and can be worth modeling before filing.

What a Significant Modification Costs the Lender

The lender is treated as exchanging the old instrument for the new one. Gain or loss equals the difference between the new instrument’s issue price and the lender’s adjusted basis in the old debt. Character follows how the lender held the debt: capital for most investors, ordinary for banks and other financial institutions that hold loans as ordinary business assets.

If the new instrument carries OID, the lender accrues that discount into income on a constant-yield basis over the life of the new debt, regardless of accounting method.⁴ For a lender that agreed to a below-market workout, that means reporting interest income above the cash actually received each year.

A significant modification also resets the clock. The new instrument has a new issue date, a new issue price, and potentially a fresh OID schedule. Any accrued market discount or premium on the old debt crystallizes at the moment of the deemed exchange.

What to Run Before Signing

The costliest mistake in a workout is missing that the change was significant. Borrowers who think they are simply pushing out a maturity or trimming a rate can walk into a six- or seven-figure COD event they did not budget for. Run the yield test first; it catches most significant modifications. If the yield change sits close to the threshold, staging the modification can help, but same-type changes aggregate and are tested together, so staging only works when the pieces truly stay below the cumulative line.

For publicly traded distressed debt, fair-market-value issue pricing almost guarantees a wide gap between old adjusted issue price and new issue price. Before signing final terms, model the Section 108 exclusions and the attribute reductions that pay for them. The exclusion that saves tax this year may destroy NOLs or basis that would have saved more tax later.

1
eCFR. 26 CFR 1.1001-3 – Modifications of Debt Instruments
2
eCFR. 26 CFR 1.1001-3 – Modifications of Debt Instruments
3
Government Publishing Office. 26 CFR 1.1001-3 – Modifications of Debt Instruments
4
Office of the Law Revision Counsel. 26 USC 1273 – Determination of Amount of Original Issue Discount
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Office of the Law Revision Counsel. 26 USC 1274 – Determination of Issue Price in Case of Certain Debt Instruments Issued for Property
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Office of the Law Revision Counsel. 26 USC 108 – Income From Discharge of Indebtedness