Financing Structure and Interest Deductibility in Business Acquisitions

How you finance a business acquisition—SBA loans, seller notes, investor capital, or bank debt—directly affects your deductible interest expense and the IRS's scrutiny of your deal. The wrong financing structure can disallow deductions you're counting on or trigger recharacterization as equity.

Interest deductibility under Section 163. Business interest expense is generally deductible, but Section 163(j) limits the deduction to 30% of adjusted taxable income for businesses with average annual gross receipts exceeding $30 million. Smaller businesses are generally exempt but must still track and document interest properly.

Debt-to-equity ratio matters. If the IRS determines that purported debt is actually equity (because the debt-to-equity ratio is unreasonable or repayment terms are not arm's length), interest deductions are disallowed and payments are recharacterized as non-deductible dividends.

Imputed interest on below-market loans. Under Sections 1274 and 7872, loans that charge less than the applicable federal rate trigger imputed interest income to the lender and imputed interest expense to the borrower, regardless of what the note says.

SBA loan entity restrictions. SBA 7(a) loans require specific entity structures and personal guarantees that may limit your flexibility in choosing the most tax-efficient entity.

The tradeoff: Maximizing leverage increases deductible interest but also increases the risk of IRS recharacterization. A CPA structures the financing to survive scrutiny while preserving the deductions you are counting on.