The interest on your business loan is deductible. The principal is not. Here's exactly how it works, what qualifies, and how different financing types are treated by the IRS.
A business loan itself is not income — and repaying the principal is not a tax deduction. However, the interest you pay on a business loan is fully deductible as a business expense, as long as the money was used for business purposes. For 2026, this applies to term loans, lines of credit, equipment financing, and invoice factoring fees. Merchant cash advance (MCA) factor fees may also be deductible as a business cost. The IRS does not let you deduct principal repayments — only the cost of borrowing.
When a lender gives you $100,000, it is not taxable income — it's borrowed money you must repay. Because you never paid tax on it when you received it, you cannot deduct it when you pay it back. The IRS treats loan principal as a wash: it enters and leaves your books without affecting your taxable income.
This is fundamentally different from a business expense, where you spend money that was already taxed as income. Loan principal is simply a movement of money that belongs to your lender.
What is deductible is the cost of using that money — which is the interest. Interest represents a real economic cost to your business, and the IRS treats it as such.
Under IRC Section 163, business interest expense is deductible. To qualify for the deduction, three conditions must be met:
You (or your business entity) must be legally liable for the debt. If someone else borrowed the money and you're making payments on their behalf, you generally cannot deduct the interest.
Both parties must intend for the money to be repaid. Informal arrangements between family members that look like gifts may not qualify.
The loan proceeds must be used for business purposes — purchasing inventory, equipment, covering payroll, funding operations, etc. Interest on funds used for personal expenses is not deductible as a business expense.
When all three conditions are met, the interest you pay — whether monthly or as part of an amortized payment — is a deductible business expense.
If you take a $150,000 term loan at 8% interest over 5 years, you will pay approximately $32,000 in total interest over the loan term. Every dollar of that interest — spread across your monthly payments — is a deductible business expense in the year it's paid.
For a business with a 25% effective tax rate, $32,000 in total interest creates approximately $8,000 in tax savings over the loan term. This effectively reduces the real cost of your financing.
Your lender should provide you with a Form 1098 (for mortgage-secured loans) or an amortization schedule showing the breakdown of principal vs. interest in each payment. Keep this documentation for your records.
For larger businesses, the Tax Cuts and Jobs Act introduced a limitation on the business interest deduction under IRC Section 163(j). This cap limits the deduction to 30% of adjusted taxable income (ATI) for the year, plus floor plan financing interest.
However, small businesses are exempt. You are not subject to the 163(j) limitation if your average annual gross receipts for the prior three tax years did not exceed $30 million. The vast majority of businesses that borrow from alternative lenders fall well under this threshold.
For businesses subject to the limitation, disallowed interest carries forward to future tax years — it is not permanently lost.
Understanding your working capital position helps determine how much financing makes sense — and how much interest expense is optimal for your tax situation.
Business term loans are the most straightforward. Each monthly payment contains a principal component and an interest component. Only the interest portion is deductible. Your lender's amortization schedule shows the breakdown for each payment.
Interest on draws from a business line of credit is deductible when the funds are used for business purposes. If you draw $50,000 for equipment and $10,000 for a personal purchase, only the interest on the $50,000 business portion is deductible. Maintaining separate bank accounts for personal and business use makes this allocation cleaner.
Interest on equipment loans is deductible as a business expense. Additionally, the equipment itself may qualify for the Section 179 deduction or bonus depreciation, giving you two separate tax benefits: deducting the asset cost and deducting the interest paid to finance it.
Invoice factoring involves selling your receivables at a discount. The discount (the difference between the face value of the invoice and what you receive) is treated as a financing expense and is generally deductible. The IRS looks at the economic substance of the transaction rather than the label.
MCAs are structured as a purchase of future receivables — not technically a loan. The factor fee (cost of capital) you pay is not "interest" in the traditional sense. However, the total cost of the advance above the funded amount is treated as a business financing expense and may be deductible.
Note on MCA deductibility: The IRS does not have specific guidance treating MCA costs identically to loan interest. Most tax professionals treat the factor fee cost as a deductible business expense under the general rule that ordinary and necessary business expenses are deductible. Consult your CPA on the specific treatment.
Revenue-based financing works similarly to an MCA but uses fixed daily/weekly ACH payments based on revenue. The cost of capital above the funded amount is generally treated as a deductible business financing expense, similar to interest.
Loan origination fees, processing fees, and similar charges to obtain a business loan are generally deductible — but the timing depends on the loan structure.
Your CPA can determine the correct treatment for fees based on your specific loan structure and term.
To support your business interest deduction, maintain the following documentation:
Good record-keeping is particularly important if you use loan proceeds for both business and personal purposes, or if your business is subject to the 163(j) limitation.
| Business Structure | Tax Form | Where to Report Interest |
|---|---|---|
| Sole Proprietor | Schedule C | Line 16 (Mortgage interest) or Line 23 (Other expenses) |
| Partnership | Form 1065 | Line 15 (Interest expense) |
| S-Corporation | Form 1120-S | Line 13 (Interest expense) |
| C-Corporation | Form 1120 | Line 18 (Interest expense) |
| LLC (multi-member) | Form 1065 | Line 15 (treated as partnership) |
Business owners can optimize the tax efficiency of their financing decisions with a few strategies:
Review your full list of deductible costs in our business expense categories guide — covering all major expense types beyond financing.
Understand how your accounts payable vs. receivable position affects your cash flow and financing needs.
Working capital, equipment loans, MCA, and lines of credit. Interest is deductible. Apply in minutes.
Apply Now (305) 384-8391The principal of a business loan is not tax deductible — it is not income when received and not a deduction when repaid. However, the interest you pay on a business loan is generally tax deductible as a business expense, provided the loan is used for legitimate business purposes.
To deduct business loan interest, three conditions must be met: (1) you are legally liable for the debt, (2) both you and the lender intend for the debt to be repaid, and (3) the loan proceeds were used for business purposes — not personal expenses.
Merchant cash advances are structured as a purchase of future receivables, not a loan. The cost (factor fee or cost of capital) may be treated as a business expense — similar to interest — and may be deductible. The tax treatment depends on the specific structure and your CPA's guidance.
Section 163(j) limits the business interest deduction for certain larger businesses to 30% of adjusted taxable income (ATI). However, this limitation generally does not apply to small businesses with average annual gross receipts of $30 million or less over the prior three tax years.
Loan origination fees, prepaid interest, and points paid to obtain a business loan are generally deductible, but may need to be amortized over the life of the loan rather than deducted entirely in year one. Your CPA can determine the correct treatment.
Yes. Interest paid on a business line of credit is deductible as a business expense, provided the funds drawn were used for business purposes. Keep records showing how line of credit funds were used.
Only the portion of interest attributable to the business use of the loan proceeds is deductible. You must allocate interest based on how the proceeds were actually used. Mixing personal and business use of loan proceeds can complicate your deduction and trigger audit risk.
Sole proprietors deduct business interest on Schedule C (Line 16). Partnerships report it on Form 1065. S-corps use Form 1120-S. C-corps use Form 1120. The deduction flows through to owners on pass-through entity returns.
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