Taking out a bank loan is a standard step for many businesses to finance operations, purchase assets, or manage cash flow. While making regular loan payments is a routine part of financial management, a frequent and significant tax error is to assume the entire payment is a deductible business expense.
The IRS has very clear rules: a loan payment consists of two distinct parts—principal and interest—and only the interest portion is deductible. This guide explains how to categorize your loan payments correctly to ensure compliance and maximize your deductions.
A bank loan payment must be broken down into its two components, as each has a completely different accounting and tax treatment.
Correctly separating principal from interest is the most critical step in handling loan payments.
The repayment of the loan principal is simply returning money that was never counted as income when you received it. Therefore, it cannot be deducted as an expense when you repay it. Your loan statement from the bank will clearly show how each payment is split between principal and interest.
If you use the proceeds of a loan for more than one purpose, you must allocate the interest based on the specific use of the funds. Publication 535 is clear: if you use 70% of a loan for business purposes and 30% for personal expenses, you can only deduct 70% of the interest paid as a business expense.
Publication 535 also specifies that you cannot deduct interest on a loan you took out to pay federal income taxes. This is not considered a business expense.
Only the business portion of the interest you pay is deductible.
For a sole proprietor filing a Schedule C (Form 1040), the deductible interest portion of your loan payments is reported on Part II, Line 16, Interest. Do not include the principal repayment amount in this section.
Your deduction for business interest may be limited. Certain businesses are required to file Form 8990 to calculate the limit on their business interest expense deduction for the year.
You must keep detailed records that separate principal and interest payments. Your essential documents include:
While Fyle doesn't manage loan amortization, it provides a robust system to document every payment and related file for accurate accounting and compliance.