Yes, you can take a business credit card interest tax deduction, but only for the interest tied to charges that were ordinary and necessary business expenses. Sole proprietors claim it on Schedule C, line 16b.1Internal Revenue Service. Instructions for Schedule C (Form 1040) (2025) If the card is used strictly for the business, the math is simple. If personal purchases share the account, you have more work to do before you can write anything off.
What Qualifies the Interest
Federal tax law allows a deduction for interest paid on debt during the year,2Office of the Law Revision Counsel. 26 USC 163 – Interest but for credit card interest to count on the business side, the charges that generated it must be ordinary and necessary expenses of running your trade or business.3Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses Ordinary means the expense is common in your line of work. Necessary means it’s helpful and appropriate, not that it’s indispensable.
IRS Publication 535 adds three threshold conditions for any interest deduction: you must be legally liable for the debt, both sides must intend repayment, and a real debtor-creditor relationship must exist.4Internal Revenue Service. Publication 535 – Business Expenses A credit card account meets all three without effort.
Personal interest does not qualify. Interest on personal charges is nondeductible whether the card has your name or your company’s name on it.5Internal Revenue Service. Topic No. 505 – Interest Expense The deduction follows what you bought, not which card paid for it.
Mixed Business and Personal Charges
The IRS looks at how borrowed money was used, not the name on the card. Treasury Regulation 1.163-8T, the interest tracing rules, require you to allocate interest by tracing debt proceeds to specific expenditures.6eCFR. 26 CFR 1.163-8T – Allocation of Interest Expense Among Expenditures Every charge on the card carries its own tax character. Office supplies produce deductible interest. A family dinner on the same account produces personal, nondeductible interest, and the character sticks to that portion of the balance for as long as it stays outstanding.
Publication 535 puts the same requirement in plainer form: if loan proceeds pay for more than one type of expense, you have to allocate the interest according to how the proceeds were used.4Internal Revenue Service. Publication 535 – Business Expenses
In practice, that means figuring out what share of the carried balance came from business charges and applying that percentage to the interest for the billing cycle. If 70% of the balance traces to business purchases, 70% of the interest is potentially deductible. The ratio has to reflect the actual composition of the balance across the statement period, not a rough annual guess, and you need to be able to reconstruct the method on demand.
A single personal purchase on a business card contaminates the interest calculation for that cycle. Treat any personal charge that slips onto a business card as a distribution to the owner and record it that way immediately. The cleaner solution is to keep a card used only for the business, which makes 100% of the interest deductible and eliminates the allocation exercise entirely.
When You Claim the Deduction
Timing follows your accounting method. Most sole proprietors use the cash method and deduct interest in the year it is actually paid. If interest posts to your statement in December but you pay it in January, it belongs on next year’s return. Under the accrual method, you deduct interest as it accrues, regardless of when you send the payment.7Internal Revenue Service. Publication 538 – Accounting Periods and Methods
One point that trips people up on the cash method: only the portion of a payment applied to interest counts. The rest goes to principal or fees. Your monthly statement breaks the payment out, and the interest figure on that statement is what you use.
Where to Report It
Sole proprietors use Schedule C (Form 1040). Line 16a is for mortgage interest paid to financial institutions where you received a Form 1098. Credit card interest goes on line 16b with other business interest.1Internal Revenue Service. Instructions for Schedule C (Form 1040) (2025)
Partnerships and S corporations report interest expense on Form 1065 or Form 1120-S, and the deduction flows through to partners or shareholders on Schedule K-1. The tracing and substantiation rules work the same way regardless of entity type.
Records You Need to Keep
The burden of proof sits with the taxpayer. Keep records until the statute of limitations closes, generally three years from the date you filed. Underreporting income by more than 25% stretches that period to six years, so holding records longer is the safer habit.8Internal Revenue Service. How Long Should I Keep Records
At a minimum, hang on to:
- Monthly credit card statements showing interest charges and how each payment was applied.
- Receipts or other records for every business charge.
- Ledger or accounting software entries classifying each transaction as business or personal.
- The credit card agreement, which documents the rate and payment terms.
- For a mixed-use card, the worksheets showing your allocation calculation for each billing period.
The strongest audit position is a continuous paper trail running from each receipt through the ledger entry to the line on your return. Gaps get filled in by the auditor, and those assumptions rarely favor the taxpayer. Reconciling a dedicated business card every month takes little time. Rebuilding two years of mixed-use allocations under audit takes a lot.
A Cap That Applies Mainly to Larger Businesses
Section 163(j) separately limits the business interest deduction for non-exempt businesses to the sum of business interest income, 30% of adjusted taxable income, and floor plan financing interest, with any excess carried forward to future years.9Internal Revenue Service. Questions and Answers About the Limitation on the Deduction for Business Interest Expense Most small businesses are exempt. If your average annual gross receipts over the prior three tax years do not exceed $32 million for tax years beginning in 2026, you are a small business taxpayer and the 163(j) cap does not apply.10Internal Revenue Service. Revenue Procedure 2025-32 You also don’t need to file Form 8990, which is the form used to compute the limitation.11Internal Revenue Service. Instructions for Form 8990 For a sole proprietor carrying a few thousand dollars of credit card interest, this cap is not in play. If your business has significant debt from several sources, check whether the combined interest expense is getting close to the threshold.