Is Business Loan Interest Tax Deductible?

Quick Answer: ✅ Yes — interest paid on loans used for business purposes is 100% deductible as a business expense. This includes bank loans, SBA loans, lines of credit, equipment financing, and business mortgages.

The Short Answer

If you borrow money for your business — whether it's an SBA loan, a bank term loan, a business line of credit, equipment financing, or a commercial mortgage — the interest you pay on that debt is fully deductible. The principal repayment is NOT deductible (that's a balance sheet item, not an expense), but the interest portion absolutely is. This is one of the most straightforward deductions in business.

IRS Rules for Deducting Business Loan Interest

The IRS allows business interest deductions when:

1. You are legally liable for the debt — The loan must be in your name or your business's name. You can't deduct interest on someone else's loan.
2. The funds are used for business purposes — If you take out a personal loan and use the money for business, the interest on the business portion is still deductible. But you need to trace the funds to business use.
3. The interest has been paid or accrued — Cash-basis taxpayers deduct interest when paid. Accrual-basis taxpayers deduct when incurred.

Business interest limitation (§163(j)): For larger businesses, the Tax Cuts and Jobs Act limits the business interest deduction to 30% of adjusted taxable income. However, this generally applies to businesses with average annual gross receipts over $30 million. Most small businesses are exempt. Check with your CPA if your revenue is approaching that threshold.

Source: IRS Publication 535 — Business Expenses (Chapter 4: Interest)

What Qualifies

✅ Deductible Interest On:

• Bank term loans
• SBA loans (7(a), 504, microloans)
• Business lines of credit
• Equipment financing and leases
• Commercial mortgages / real estate loans
• Business auto loans
• Inventory financing
• Merchant cash advance fees (treated as interest in many cases — check with CPA)
• Loans from individuals (if properly documented)

❌ Not Deductible:

• Interest on personal loans (even if you're self-employed)
• The principal portion of loan payments
• Interest on loans used for tax-exempt investments
• Prepaid interest (must be allocated to the periods it covers)

How Much Can You Deduct?

100% of business loan interest (for most small businesses).

Example — SBA Loan:

• Loan amount: $150,000
• Interest rate: 8.5%
• Annual interest paid: ~$12,750
• Full deduction: $12,750
• Tax savings at 24% bracket: ~$3,060

Example — Equipment Financing:

• Financed amount: $40,000 for a work truck
• Annual interest paid: ~$2,800
• Full deduction: $2,800
• Tax savings at 24% bracket: ~$672

How to Categorize in QuickBooks

• QBO Category: "Interest Paid" (under Expenses)
• Schedule C Line: Line 16a — Interest on business mortgage; Line 16b — Interest (other)
• Tip: Create sub-accounts:

- "Interest — Business Mortgage" (for commercial real estate loans)

- "Interest — Loans" (for term loans, SBA, lines of credit)

- "Interest — Equipment Financing"

- This helps your CPA place each on the correct Schedule C line.

• Important: Only categorize the interest portion of loan payments as an expense. The principal portion should be recorded as a liability reduction (loan paydown), not an expense.

Common Mistakes to Avoid

1. Deducting the full loan payment as an expense — Only the interest is deductible. The principal repayment reduces your loan balance but is NOT an expense. This is one of the most common bookkeeping errors.
2. Mixing personal and business loan use — If you take a home equity loan and use half for business, only half the interest is deductible as a business expense. Document the allocation.
3. Forgetting SBA loan guarantee fees — The guarantee fee on an SBA loan is also deductible. It's often paid upfront and can be amortized over the loan term.
4. Not separating interest from principal in QBO — When you import loan payments, QBO may import the full payment as one transaction. Split it into interest (expense) and principal (liability reduction).

Record-Keeping Requirements

• Loan agreement showing terms, interest rate, and purpose
• Monthly loan statements showing interest vs. principal breakdown
• Year-end interest summary (Form 1098 for mortgages; lender statements for other loans)
• Proof that loan proceeds were used for business purposes
• Amortization schedule (helpful for tracking interest over the life of the loan)

Who Can Deduct Business Loan Interest?

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