This article provides general educational information about LOC tax treatment. Tax rules are complex and situation-specific. Always work with a licensed CPA or tax professional before making deduction decisions. This is not tax advice.
Estimate your annual tax deduction from LOC interest and fees — and the real after-tax cost of your line. Consult your CPA for actual figures.
What's Deductible on a Business Line of Credit
Under IRC Section 163, business interest expense is generally deductible. A business line of credit used for legitimate business purposes generates deductible interest. The key rule: the funds must be used for business, and your business must have a genuine profit motive.
| LOC Cost | Deductible? | Notes |
|---|---|---|
| Interest charges on drawn balance | Yes | Deductible in the year paid (cash basis) or accrued (accrual basis) |
| Annual maintenance / facility fee | Yes | Deduct in year paid as a business expense |
| Draw fees / transaction fees | Yes | Deductible as incurred — ordinary business expense |
| Origination fee / setup fee | Partially | May need to be amortized over the loan term rather than deducted in full upfront |
| Late payment fees | Generally Yes | Deductible as a business expense; consult your CPA for specific situations |
| Non-use / standby fees | Yes | Fees for maintaining an undrawn line are deductible |
| Interest on personal-use draws | No | Personal-use portion of LOC interest is not deductible |
| Principal repayments | No | Principal is never deductible — only interest and fees |
The Critical Rule: Business Use Requirement
The IRS requires that LOC funds be used for business purposes to generate a deductible interest expense. This creates the allocation problem when you draw on a LOC and use the funds for mixed business/personal purposes.
Best practice: keep a separate business bank account and only use your business LOC for business expenditures. This creates a clean paper trail that makes deduction documentation straightforward — and eliminates the need for complex tracing calculations at tax time.
How LOC Interest Flows Through Your Tax Return
Deduction by Entity Type
Sole Proprietor
Deduct on Schedule C, Line 16 (Interest). Also includes interest paid on business credit lines and loans.
Single-Member LLC
Treated as sole proprietor by default — deduct on Schedule C unless you've elected S-Corp or C-Corp taxation.
Partnership / Multi-Member LLC
Deduct on Form 1065. Interest flows through to partners' K-1 forms and is reported on personal returns.
S-Corporation
Deduct on Form 1120-S. Passed through to shareholders via K-1. Watch for potential limitations at the shareholder level.
C-Corporation
Deduct directly on Form 1120. Subject to the IRC 163(j) business interest limitation for larger businesses.
IRC Section 163(j): Large Business Limitation
For businesses with average annual gross receipts over $30 million, IRC Section 163(j) limits the business interest deduction to 30% of adjusted taxable income. Most small businesses are exempt from this limitation — it primarily affects larger corporations with significant debt loads.