Yes, you can take a business credit card interest deduction, but only for the portion of interest tied to charges that were ordinary and necessary business expenses. Sole proprietors claim it on Schedule C, line 16b. The rule is simple when the card is used exclusively for the business. Once personal charges land on the same account, the math and the recordkeeping get harder.
What Has to Be True for the Interest to Qualify
Federal tax law allows a deduction for interest paid on debt during the tax year.1Office of the Law Revision Counsel. 26 USC 163 – Interest For credit card interest, that rule works together with the requirement that a business expense be ordinary and necessary in your trade or business.2Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses Ordinary means common in your line of work. Necessary means helpful and appropriate, not indispensable.
IRS Publication 535 adds three baseline conditions that apply before any interest deduction is available: you must be legally liable for the debt, both you and the lender must intend that it be repaid, and there must be a genuine debtor-creditor relationship.3Internal Revenue Service. Publication 535 – Business Expenses A standard credit card meets all three without effort. The real question isn’t whether the interest qualifies in principle; it’s whether you can show that each charge served a business purpose.
Interest on personal expenses is not deductible, whether the charge sits on a personal card or a business card.4Internal Revenue Service. Topic No. 505 – Interest Expense What matters for the deduction is what the money bought, not the name on the plastic.
Mixed Charges and the Tracing Rules
The IRS allocates interest expense by tracing debt proceeds to specific expenditures under Treasury Regulation 1.163-8T.5eCFR. 26 CFR 1.163-8T – Allocation of Interest Expense Among Expenditures The classification follows the use of the borrowed money, not the type of account or any collateral. Publication 535 puts the same rule in plainer language: when a loan’s proceeds are used for more than one type of expense, the interest must be allocated based on how the proceeds were used.3Internal Revenue Service. Publication 535 – Business Expenses
Applied to a credit card, every charge carries its own tax character. Office supplies charged to the card generate deductible interest on that portion of the balance. A family dinner charged to the same card generates nondeductible personal interest on its portion. Both characters persist for as long as the balance stays outstanding.
If a card mixes business and personal purchases, you need to work out what share of the outstanding balance came from business charges and apply that percentage to the interest for the billing cycle. A 70% business share means 70% of that cycle’s interest is potentially deductible. The ratio has to reflect the actual composition of the balance across the statement period, not a rough guess at year-end. Reconstructing it later without contemporaneous records is difficult, and if the allocation method can’t be defended, the whole interest deduction can be disallowed.
The cleaner approach is to keep one card for business and one for personal use. With a dedicated business card, 100% of the interest is deductible and the allocation math disappears. If a personal charge does end up on the business card, record it immediately as an owner distribution so it doesn’t quietly convert the account into a mixed-use card.
When You Claim the Deduction
Your accounting method controls the timing. Most sole proprietors and small businesses use the cash method and deduct expenses in the year they’re actually paid.6Internal Revenue Service. Publication 538 – Accounting Periods and Methods For credit card interest, that means the deduction lands in the year your payment is applied to the interest portion of the balance. Interest that accrues in December but is paid in January belongs on next year’s return.
Under the accrual method, interest is deducted as it accrues, regardless of when cash goes out.6Internal Revenue Service. Publication 538 – Accounting Periods and Methods Card interest accrues daily, so an accrual-basis business recognizes the expense as it builds up through each billing cycle.
One point that catches people out on the cash method: only the interest portion of your payment is deductible. The rest goes to principal or fees. Your monthly statement shows the split, and the interest figure on the statement is the number that flows into your books.
Where to Report It
Sole proprietors report business credit card interest on Schedule C (Form 1040), line 16b. Line 16a is reserved for mortgage interest paid to financial institutions where you received a Form 1098; credit card interest goes on 16b.7Internal 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 passes through to partners or shareholders on Schedule K-1. The substantiation rules are the same regardless of entity type: the interest has to trace to business expenditures, and the documentation has to hold up.
The Section 163(j) Cap
A separate provision can limit total business interest in a given year. Under Section 163(j), deductible business interest for non-exempt businesses generally can’t exceed the sum of business interest income, 30% of adjusted taxable income, and floor plan financing interest, with any excess carried forward.8Internal 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 don’t exceed $32 million for tax years beginning in 2026, you’re a small business taxpayer and 163(j) doesn’t apply.9Internal Revenue Service. Revenue Procedure 2025-32 You also don’t have to file Form 8990, which is the form used to compute the limitation.10Internal Revenue Service. Instructions for Form 8990 For a sole proprietor with a few thousand dollars of card interest, this cap is almost never in play. If your business carries significant debt across multiple sources, it’s worth checking whether combined interest expense approaches the threshold. When 163(j) does apply, complete Form 8990 first and put only the allowable amount on Schedule C.
Records to Keep
The taxpayer carries the burden of proof, and records generally need to be kept until the statute of limitations runs, which is three years from the date you filed.11Internal Revenue Service. How Long Should I Keep Records
For a credit card interest deduction, keep:
- Monthly statements showing interest charges and how payments were applied
- Receipts or records for each business charge on the card
- Ledger entries or accounting software records classifying each transaction as business or personal
- The credit card agreement, which documents rate and payment terms
- For mixed-use cards, the worksheets showing your allocation math for each billing period
The strongest audit position is a clean chain running from each receipt to a ledger entry to a line on the return. Gaps in that chain get filled by the auditor’s assumptions, and those assumptions rarely help. A dedicated business card, transactions run through accounting software, and monthly reconciliation cost very little time. Rebuilding two years of mixed-use allocations after the fact costs a great deal more.