Tax Implications of Business Loans, Debt Restructuring, and Interest Deductions

By Yarik Yarosh, CPA ·September 5, 2026 ·Updated October 4, 2026 ·7 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

The tax treatment of business debt is straightforward in principle but produces unexpected results in practice. Under IRC 163(a), all interest paid or accrued on indebtedness is deductible, and this general rule makes debt one of the most tax-efficient ways to finance a business because the interest payments reduce taxable income while the loan proceeds (which are not income) fund the business’s operations or acquisitions. However, the general rule is subject to several limitations and complications. The IRC 163(j) business interest limitation caps the annual business interest deduction at 30% of adjusted taxable income for businesses with average annual gross receipts exceeding $32,000,000 for 2026 ($31,000,000 for 2025). The limitation applies at the entity level for partnerships and S-Corps, which means the disallowed interest is allocated to the partners or shareholders and carried forward at their individual level. Small businesses (under the $32 million threshold) are exempt from the limitation, which means most small businesses can deduct all of their business interest without restriction.

✓Key takeaway

Business loan tax treatment basics:

Transaction	Tax Treatment
Receiving loan proceeds	Not income (no tax)
Repaying loan principal	Not deductible
Paying interest on business debt	Deductible under IRC 163(a) (subject to 163(j) if applicable)
Loan forgiveness (COD income)	Taxable as ordinary income (IRC 61(a)(11)), unless IRC 108 exclusion applies
Debt-for-equity swap	COD income = debt minus FMV of equity issued
Below-market loan from shareholder	Imputed interest under IRC 7872
Loan origination fees (points)	Amortized over loan term (not deducted in year paid)

IRC 163(j) business interest limitation:

Item	Rule
Applies to	Businesses with average annual gross receipts > $32M (2026, indexed)
Limitation	Business interest income + 30% of adjusted taxable income (ATI)
ATI calculation	Taxable income + business interest expense + NOL deduction + depreciation/amortization (for ATI purposes, depreciation adds back only for tax years beginning before 2022; after 2021, ATI is closer to EBIT than EBITDA)
Carryforward	Disallowed interest carried forward indefinitely
Exempt businesses	Small businesses (< $32M avg. gross receipts); real property trades or businesses (election under IRC 163(j)(7)(B)); farming (election)
Real property election tradeoff	Must use ADS depreciation (longer recovery periods)

Types of business debt and interest deductibility:

Debt Type	Interest Deductible?	Notes
Bank term loan (business purpose)	Yes	Standard deduction under IRC 163(a)
Business line of credit	Yes	Interest deductible when paid/accrued
SBA loan (7(a), 504)	Yes	Same treatment as any business loan
Equipment financing / capital lease	Yes (interest portion)	Portion of payment representing interest is deductible
Commercial mortgage	Yes	Interest on real property used in business
Shareholder loan to S-Corp	Yes (to entity)	Creates shareholder debt basis for loss purposes
Credit card interest (business card)	Yes	If used for business expenses
Personal loan used for business	Yes (business portion)	Must trace proceeds to business use (IRC 163(h) tracing rules)
Personal mortgage (home office)	Yes (business %)	Deductible through home office calculation
Investment interest	Limited to net investment income (IRC 163(d))	Excess carries forward

How do business loans and debt restructuring affect taxes?

Hypothetical example

Round numbers. A business has $2,000,000 in outstanding loans and $500,000 in annual interest expense.

IRC 163(j) limitation analysis (if applicable):

Item	Amount
Business interest expense	$500,000
Business interest income	$10,000
Adjusted taxable income (ATI)	$1,200,000
30% of ATI	$360,000
Deductible interest (interest income + 30% ATI)	$370,000
Disallowed interest (carried forward)	$130,000
Tax cost of disallowed interest (37%)	$48,100

If the business has average gross receipts under $32,000,000 (the 2026 threshold): the full $500,000 is deductible (no 163(j) limitation).

Interest tracing rules (IRC 163(h) / Temp. Reg. 1.163-8T):

When a loan is used for mixed purposes, the interest must be traced to the use of the proceeds:

Use of Loan Proceeds	Interest Character
Business operations	Business interest (deductible on Schedule C / Form 1065 / 1120-S)
Investment property (stocks, bonds)	Investment interest (deductible up to net investment income)
Personal use	Personal interest (not deductible)
Rental property	Passive activity interest (subject to passive loss rules)

Example: Owner takes a $200,000 HELOC and uses $120,000 for business, $50,000 for investments, $30,000 for personal:

Allocation	Amount	Interest (6%)	Deductible?
Business	$120,000	$7,200	Yes (business expense)
Investment	$50,000	$3,000	Yes (up to net investment income)
Personal	$30,000	$1,800	No
Total	$200,000	$12,000	$10,200 deductible

Debt restructuring scenarios:

Scenario 1: Principal reduction (creditor agrees to reduce debt):

Item	Amount
Original debt	$500,000
Creditor agrees to accept	$350,000
COD income	$150,000
Tax at 37% (if not insolvent)	$55,500

Scenario 2: Interest rate reduction (no COD income):

Item	Before	After
Principal	$500,000	$500,000
Interest rate	8%	5%
Annual interest	$40,000	$25,000
Annual interest deduction	$40,000	$25,000
COD income	$0	$0

A modification of interest rate alone generally doesn’t produce COD income. However, if the modification is a “significant modification” under Treas. Reg. 1.1001-3, it may be treated as an exchange of the old debt for new debt, which can produce gain or loss.

Scenario 3: Debt-for-equity swap:

Item	Amount
Debt cancelled	$500,000
FMV of equity issued to creditor	$300,000
COD income	$200,000
Tax at 37%	$74,000

Scenario 4: Related-party loan forgiveness:

Item	Details
Parent forgives $100,000 loan to child’s business	Treated as a gift from parent to child (not COD income)
Shareholder forgives loan to own S-Corp	Capital contribution (increases shareholder basis; no COD to S-Corp)
S-Corp forgives loan to shareholder	Taxable distribution to shareholder (treated as dividend to extent of E&P if former C-Corp, or return of basis)

Imputed interest on below-market loans (IRC 7872):

Loan Type	Rule	AFR (2025 approximate)
Demand loan	Interest imputed at short-term AFR	~4.5%
Term loan (< 3 years)	Short-term AFR	~4.5%
Term loan (3-9 years)	Mid-term AFR	~4.3%
Term loan (> 9 years)	Long-term AFR	~4.7%
Compensation-related loan (employer to employee)	Imputed interest = compensation income to employee; interest deduction to employer	At applicable AFR
Corporation to shareholder	Imputed interest = dividend to shareholder; interest income to corporation	At applicable AFR
Gift loan ($10,000-$100,000)	Imputed interest limited to borrower’s net investment income	At applicable AFR
Gift loan (< $10,000)	De minimis exception; no imputation	N/A

Example: S-Corp loans $500,000 to shareholder-employee at 0% interest:

Item	Amount
Imputed interest (4.5% AFR)	$22,500
Treatment to shareholder	$22,500 compensation income (W-2)
Treatment to S-Corp	$22,500 interest income + $22,500 compensation deduction (wash)
FICA on $22,500	$3,443 (employer + employee combined)

Loan vs. equity contribution comparison:

Factor	Debt (Loan to Business)	Equity (Capital Contribution)
Interest payments	Deductible by business	N/A (dividends/distributions not deductible)
Repayment of principal	Tax-free return of capital	Return of basis (tax-free to extent of basis)
Basis for S-Corp losses	Creates debt basis (IRC 1366(d))	Creates stock basis
Forgiveness	COD income (or capital contribution if by shareholder)	N/A
Thin capitalization risk	IRS may recharacterize as equity if debt-to-equity ratio too high	No risk
Bankruptcy priority	Debt has priority over equity	Equity is last in liquidation

Illustrative numbers only, not a real client and not advice for your facts.

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Cite this page

Yarik Yarosh, CPA. "Tax Implications of Business Loans, Debt Restructuring, and Interest Deductions." Blue Cloud CPA, September 5, 2026, updated October 4, 2026. https://bluecloudcpa.com/guides/small-business-tax-implications-business-loans-debt-restructuring-interest

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.

Tax Implications of Business Loans, Debt Restructuring, and Interest Deductions

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