Business Line of Credit vs. Business Credit Card (2026): Which Keeps Your Schedule C Line 16b Interest Deduction Clean

Published: November 2, 2026 · Reading time: 12 min

TL;DR: The interest on a business line of credit and on a business credit card is deductible on Schedule C line 16b under the same rule: only to the extent the borrowed money paid for business expenses. The name on the account does not decide it. What differs is how easy each one makes the trace. A card pays the merchant directly, so the debt follows the purchase. A line-of-credit draw deposited in checking is treated as an investment until spent and as spent before your own money already in the account, so a personal bill paid right after the draw can turn part of the line into personal debt (a 15-day rule can rescue it). On a mixed balance, repayments retire the personal part first. Fees for keeping credit available are not interest. In the worked example, $9,000 of equipment costs $393.75 of interest on a 10.5% line versus $900.00 on a 24% card, and the deduction gives back only $71.53 of the $506.25 gap in self-employment tax.

Freelancers usually pick a line of credit or a credit card based on whichever one the bank offered first. At tax time the question shows up as one number on Schedule C line 16b, and whether that number holds up depends less on the product than on how the money moved.

This guide compares the two side by side using the statute, the interest-tracing regulation and the IRS's own instructions, works one $9,000 equipment purchase through both with every figure computed, and shows the two traps that quietly make part of the interest personal. Several neighbouring questions have their own guides: what belongs on line 16, a business card vs. a personal card, a HELOC vs. a business loan, loan origination fees and bridging one unpaid invoice.

The Rule Both Products Share

Start with what does not differ. Publication 334 says:

"Interest relates to your business if you use the proceeds of the loan for a business expense. It doesn't matter what type of property secures the loan."

The Schedule C instructions for lines 16a and 16b put the method in one sentence: "Generally, you allocate interest expense by tracing how the proceeds of the loan were used." The regulation behind that, Treasury Regulation 1.163-8T(c)(1), says debt proceeds and related interest expense "are allocated solely by reference to the use of such proceeds."

What falls outside the business bucket is not deductible on Schedule C at all. Section 163(h)(1) says that for a taxpayer other than a corporation, "no deduction shall be allowed under this chapter for personal interest paid or accrued during the taxable year," and section 163(h)(2)(A) carves out "interest paid or accrued on indebtedness properly allocable to a trade or business (other than the trade or business of performing services as an employee)." Pub. 334 adds the practical version: "If a loan is part business and part personal, you must divide the interest between the personal part and the business part."

Three more conditions apply to both products. Pub. 334 says you can deduct interest on a debt only if "You are legally liable for that debt," "Both you and the lender intend that the debt be repaid," and "You and the lender have a true debtor-creditor relationship."

So a "business" label buys nothing on its own. A business card used for groceries produces personal interest, and a personal card used for a client's equipment can produce business interest. The comparison that matters is how each product records where the money went.

How the Trace Works on Each Product

A card purchase follows the purchase

When you buy a camera on a card, the issuer pays the merchant. Treasury Regulation 1.163-8T(c)(3)(i) covers this case: "If a lender disburses debt proceeds to a person other than the borrower in consideration for the sale or use of property, for services, or for any other purpose, the debt is treated for purposes of this section as if the borrower used an amount of the debt proceeds equal to such disbursement to make an expenditure for such property, services, or other purpose."

In plain terms, the card statement is the trace. Each charge is a borrowing for whatever you bought. A card that only ever carries business charges produces interest that is business interest with no further allocation.

The exception is a cash advance or a "convenience check" deposited in your bank account. That money reaches you, not a merchant, so it is traced like a line-of-credit draw, below.

A line-of-credit draw lands in an account first

Most lines of credit deposit the draw in your checking account. The regulation treats that deposit as an investment until you spend it. Section 1.163-8T(c)(4)(i): "a deposit of debt proceeds in an account is treated as an investment expenditure, and amounts held in an account (whether or not interest bearing) are treated as property held for investment."

Then comes the ordering rule that catches people. Under section 1.163-8T(c)(4)(ii), borrowed money deposited in an account is treated as spent before "Any unborrowed amounts held in the account at the time such debt proceeds are deposited" and before "Any amounts (borrowed or unborrowed) that are deposited in the account after such debt proceeds are deposited."

That means the first money out of the account after a draw is treated as the borrowed money, whatever you meant it for. If the first payment out is your rent, the line has funded your rent.

There is a rescue. Section 1.163-8T(c)(4)(iii)(B) says: "The taxpayer may treat any expenditure made from an account within 15 days after debt proceeds are deposited in such account as made from such proceeds to the extent thereof even if under paragraph (c)(4)(ii) of this section the debt proceeds would be treated as used to make one or more other expenditures." It is a choice the regulation lets you make, and it only reaches spending inside the 15-day window.

Some lenders will pay a vendor directly from the line. That is third-party financing under (c)(3)(i), the same as a card purchase, and it skips the account problem entirely.

Side by Side

Worked Example: The Same $9,000, Two Products

Marisol is a single freelance video editor who uses the cash method. On March 1, 2026 she needs $9,000 for a camera package she will use only for client work. She compares two options, with rates assumed for illustration:

• A business line of credit at 10.5% APR, with the lender paying the camera vendor directly
• A business credit card at 24% APR, with the camera charged to the card

Either way she pays $1,000 of principal plus that month's interest at the end of each month, March through November, so the debt is gone by November 30. To keep the arithmetic visible, interest is figured each month as the starting balance times the APR divided by 12; real lenders usually figure it daily, so a statement will differ slightly. Because the debt paid only for business equipment and she pays the interest from her own funds, all of the interest is business interest on line 16b.

The card costs $506.25 more in interest. The deduction does not close that gap. Self-employment tax is figured on 92.35% of net profit at 15.3%, so each dollar of line 16b interest cuts SE tax by about 14.1 cents, assuming net earnings below the Social Security wage base:

So the extra $506.25 of card interest buys only $71.53 more in self-employment tax savings. The income-tax effect depends on Marisol's bracket, which turns on household facts beyond the ones stated, so this example does not apply one. Whatever her bracket, a deduction returns only part of each interest dollar. The deduction is a partial rebate on interest, never a reason to choose the more expensive debt.

The card has one structural advantage the table does not show: most card agreements charge no interest on new purchases if the previous statement balance was paid in full by the due date, while a line of credit usually charges interest from the day of the draw. If Marisol could pay the whole $9,000 within one billing cycle, the card could cost nothing. Check your own agreement; that is a feature of the contract, not a tax rule.

Trap 1: The Draw That Paid Your Rent

Change one fact. Instead of having the lender pay the vendor, Marisol draws the $9,000 into her business checking account on March 1. The account already holds $4,000 of client payments. On March 4 she pays a $2,500 personal bill from that account, and on March 25 she buys the camera for $9,000.

Under the ordering rule in section 1.163-8T(c)(4)(ii), the borrowed money is treated as spent first. The March 4 personal bill is treated as paid with $2,500 of the line, and the camera with the remaining $6,500 of borrowed money plus $2,500 of her own. The camera purchase came 24 days after the deposit, outside the 15-day rule. Result: $2,500 of the line is personal debt. At 10.5% that is about $21.88 of nondeductible interest a month until repayments retire it, which the ordering rule applies to the personal slice first, so the cost is typically a few months, not permanent ($2,500 × 10.5% ÷ 12 = $21.875). And until the camera purchase, the unspent $6,500 sat in the account, which the regulation treats as an investment, so interest for those weeks is not business interest either.

Now move the camera purchase to March 10, nine days after the deposit. Under the 15-day rule in (c)(4)(iii)(B), she may treat the $9,000 camera as made from the borrowed money to the extent of the $9,000 she borrowed, and the personal bill is then paid with her own money. From the purchase date, the whole line is business debt (unless she elects the optional monthly-date rule in (c)(4)(iv) of the same section, the nine days the money sat in the account are still treated as an investment).

Same draw, same personal bill: moving the purchase from day 24 to day 9 turns $2,500 of the line from personal debt back into business debt. The cheapest protection is procedural: have the lender pay the vendor, or draw only on the day the business bill is due and pay nothing personal from that account in the meantime. Commingling business and personal funds covers the wider version of this problem.

Trap 2: The Mixed Card, and the Rule That Helps

Cards get mixed the other way: a personal charge lands next to business ones. Here the regulation contains a rule that works in your favour.

Section 1.163-8T(d)(1) says that when a debt allocated to more than one expenditure is partly repaid, it is "treated for purposes of this section as repaid in the following order," starting with "(i) Amounts allocated to personal expenditures" and ending with "(v) Amounts allocated to trade or business expenditures." Section 1.163-8T(d)(3) applies this to revolving credit: for "borrowings pursuant to a line of credit or similar account or arrangement that allows a taxpayer to borrow funds periodically under a single loan agreement," all borrowings "on which interest accrues at the same fixed or variable rate are treated as a single debt." A card that lets you borrow repeatedly under one agreement is a reasonable fit for that description, but confirm the application to your account with a CPA or EA.

Say Marisol had used a personal card at 24% instead, charging the $9,000 camera and $3,000 of personal purchases in March, then paying $1,000 of principal plus interest each month from the end of March. Under the ordering rule, her first $3,000 of principal payments retire the personal charges, and the business $9,000 stays whole until June.

Of $1,500 of interest in 2026, $1,380 is business interest under the ordering rule and $120 is personal. A flat split by original charges (75% business, because $9,000 of the $12,000 charged was business) would have claimed only $1,125, which is $255 less. The ordering rule is not a loophole; it is how the regulation says repayments are counted, and it only works with records of every charge and payment.

Two cautions. First, (d)(3) treats borrowings "at different fixed or variable rates" as different debts, repaid "in the order in which such borrowings are treated as repaid under the loan agreement." A card carrying a 0% promotional balance and a standard-rate balance is two debts, and the regulation's own line-of-credit example shows the order changing which expenditures are treated as repaid. Second, none of this makes a mixed card simpler than a clean one. A card that carries only business charges needs no table at all.

Fees Are Not Interest

Line 16b is for interest, which Pub. 334 describes as interest you pay or accrue "on debts related to your business." Several charges on these accounts are something else.

• Unused-line, annual or maintenance fees on a line of credit. Publication 535 (2022), the last edition before the IRS discontinued it, says: "Fees you incur to have business funds available on a standby basis, but not for the actual use of the funds, are not deductible as interest payments. You may be able to deduct them as business expenses." It adds that if the funds are for inventory or certain property used in your business, the fees are indirect costs you must generally capitalize.
• Card annual fees. A charge for having the account, not for using borrowed money, so not line 16b interest.
• Origination fees and points. Pub. 535 says that if these charges "are solely for the use of money, they are interest," but "Because points are prepaid interest, you generally cannot deduct the full amount in the year paid." See loan origination fees on Schedule C for spreading them over the term.

If your card earns rewards on business purchases, credit card rewards and business deductions covers how they interact with the deductible cost of what you bought.

The Cash-Method Timing Trap

Most freelancers use the cash method (see cash vs. accrual). Pub. 535 says: "Under the cash method, you can generally deduct only the interest you actually paid during the tax year."

It also has a rule that matters for revolving credit: "If you use the cash method of accounting, you cannot deduct interest you pay with funds borrowed from the original lender through a second loan, an advance, or any other arrangement similar to a loan. You can deduct the interest expense once you start making payments on the new loan." Publication 535 adds that each payment on the new loan is applied first to interest and then to principal, so later payments can bring the deduction into the same year.

That is the line that automatically advances funds to cover its own monthly interest charge, or interest that is simply rolled into a balance you owe the same lender. If you pay at least the interest each month from your own money, the issue usually does not arise. If you let interest capitalize, especially across December 31, the "interest charged" figure on a year-end summary may not be the interest you paid in that year. Ask a CPA or EA to reconcile the two before you file.

The Limit You Probably Don't Face

The 2025 Schedule C instructions say you must file Form 8990 to deduct business interest "unless you are a small business taxpayer (defined under Part III) or meet one of the other filing exceptions." Part III defines a small business taxpayer as one with "average annual gross receipts of $31 million or less for the 3 prior tax years (indexed for inflation)" that is not a tax shelter. Nearly every freelancer qualifies and reports all deductible interest on lines 16a and 16b. That limit is about how much business interest you can deduct; it does nothing to make personal interest deductible. The section 163(j) guide has the details.

Which One Fits You? A Quick Decision Guide

• You will repay within one billing cycle. A card with a grace period may cost nothing, and the purchase is traced to the merchant automatically.
• You will carry a balance for months. Compare APRs first. In the example, the higher-rate debt cost $506.25 more and the deduction returned $71.53 of it in SE tax.
• You need cash, not a purchase (a subcontractor, a supplier who won't take cards). A line of credit is the natural tool, but draw only when the bill is due, or have the lender pay the payee. Don't borrow on either product for your own income tax expecting a deduction: Treasury Regulation 1.163-9T(b)(2)(i)(A) treats interest on indebtedness used to pay individual income taxes as personal interest "regardless of the source of the income generating the tax liability." See paying a tax bill you can't cover.
• You already have a mixed card. Keep records of each charge and payment and let the ordering rule work, or move future business charges to a card that carries nothing else.
• You are borrowing against your home. Different rules apply; see HELOC vs. business loan.

Frequently Asked Questions

Is interest on a business line of credit or a business credit card deductible on Schedule C?

Yes, to the extent the borrowed money paid for business expenses. Publication 334 says interest relates to your business if you use the proceeds of the loan for a business expense and that it doesn't matter what type of property secures the loan. The Schedule C instructions say you generally allocate interest expense by tracing how the proceeds of the loan were used. Interest traced to personal spending is personal interest, which section 163(h) disallows for individuals, even if the account is labeled business. Business interest from either product generally goes on line 16b. Publication 334 also says you can deduct interest only if you are legally liable for the debt, you and the lender intend that it be repaid, and you have a true debtor-creditor relationship. Confirm your allocation with a CPA or EA.

Which is better for taxes, a line of credit or a business credit card?

Neither one gets a better deduction. The tax rule is the same for both: interest is deductible on Schedule C only to the extent the borrowed money was used for the business, and the account type does not change that. The difference is how easy each makes the trace. A card purchase is paid straight to the merchant, so the debt follows that purchase. A line-of-credit draw deposited in your checking account is treated as an investment until it is spent, and under the ordering rule in Treasury Regulation 1.163-8T(c)(4)(ii) it is treated as spent before money already in the account, so a personal bill paid from that account soon after the draw can turn part of the line into personal debt. The cheaper product is usually the one with the lower rate, because a deduction only returns part of the interest. Ask a CPA or EA to review a mixed account.

If I pay a personal bill from my business account after a line-of-credit draw, is the interest still deductible?

Possibly not all of it. Treasury Regulation 1.163-8T(c)(4)(i) treats a deposit of borrowed money in an account as an investment expenditure until it is spent, and (c)(4)(ii) treats the borrowed money as spent before unborrowed amounts already in the account. So a personal bill paid from the account right after the draw can be treated as paid with the loan, and the interest on that slice is nondeductible personal interest. The regulation also lets you treat any expenditure made from the account within 15 days after the deposit as made from the borrowed money, to the extent of the borrowed amount, which can rescue the trace if the business purchase happens inside that window. The simplest fix is to have the lender pay the vendor directly or to draw only when the business bill is due. A CPA or EA should review the trace if your account mixes business and personal spending.

How do I split the interest on a card used for both business and personal purchases?

You allocate the debt to what each charge paid for, then allocate the interest the same way. Treasury Regulation 1.163-8T(d)(1) treats repayments as retiring the amounts allocated to personal expenditures first and the amounts allocated to trade or business expenditures last. Under (d)(3), borrowings under a line of credit or similar arrangement that accrue interest at the same rate are treated as a single debt, while borrowings at different rates, such as a promotional rate and a standard rate, are treated as different debts repaid in the order the loan agreement says. On a card that carries one rate, that usually means the business slice stays outstanding longest. It is still a monthly calculation that needs records of every charge and payment, so ask a CPA or EA to confirm it, or keep a separate card that only ever carries business charges.

Are line-of-credit fees and card annual fees deductible as interest on line 16b?

Not as interest. Publication 535 (2022), the last edition before the IRS discontinued it, says fees you incur to have business funds available on a standby basis, but not for the actual use of the funds, are not deductible as interest payments, and that you may be able to deduct them as business expenses. An unused-line or annual maintenance fee on a business line of credit looks like that kind of charge. A card's annual fee is a charge for the account, not for the use of borrowed money, so it does not belong on line 16b either. If the funds are for inventory or certain property used in your business, Publication 535 says the fees are indirect costs you must generally capitalize. Fees charged to obtain a loan, such as origination fees, are generally spread over the loan term rather than deducted at once. Confirm how each fee on your statement is treated with a CPA or EA.

Can I deduct interest that a line of credit pays by drawing on itself?

Not until you pay it with your own funds, if you use the cash method. Publication 535 (2022) says that if you use the cash method you cannot deduct interest you pay with funds borrowed from the original lender through a second loan, an advance, or any other arrangement similar to a loan, and that you can deduct the interest once you start making payments on the new loan, with each payment applied first to interest, so the deduction can still fall in the same year once those payments are made. A line that automatically advances funds to cover its own interest charge, or interest that is simply added to a balance you owe the same lender, raises this question. If you actually pay at least the interest each month from your own funds, it usually does not arise. Ask a CPA or EA how to treat interest that was capitalized into the balance, especially around year end.

Does the business interest limit apply to a freelancer's line of credit or card?

Usually not. The 2025 Schedule C instructions say you must file Form 8990 to deduct any interest expenses of the business unless you are a small business taxpayer or meet another filing exception, and they define a small business taxpayer as one with average annual gross receipts of $31 million or less for the 3 prior tax years (indexed for inflation) that is not a tax shelter. For tax years beginning in 2026, Rev. Proc. 2025-32 sets that figure at $32 million. A small business taxpayer reports all of its deductible interest on lines 16a and 16b. That exemption does not make personal interest deductible: the tracing rules still decide how much of the interest is business interest in the first place. Confirm your status and the current-year threshold with a CPA or EA.

Authoritative References

• 26 U.S.C. 163, Interest (including 163(h), personal interest)
• 26 CFR 1.163-8T, Allocation of interest expense among expenditures
• 26 CFR 1.163-9T, Personal interest
• IRS Publication 334, Tax Guide for Small Business (Interest)
• IRS Publication 535 (2022), Business Expenses (Chapter 4, Interest)
• IRS Instructions for Schedule C (Form 1040), Lines 16a and 16b
• IRS: Rev. Proc. 2025-32 (2026 inflation adjustments, section 448(c) gross receipts test)
• IRS Instructions for Form 8990

Keep the trace while it is easy. A line 16b deduction is only as good as the record of what the borrowed money bought: the invoice behind each card charge, the vendor a draw paid, the date it cleared. Start a free CentSense account to scan receipts with AI as they arrive and keep them next to your expenses. The free tier includes 10 AI receipt scans a month, no credit card required, and the Solo plan is $5/month for unlimited scans, mileage tracking and CSV export.

This guide is general education for U.S. freelancers who file Schedule C. It is not personalized tax, legal or financial advice. Marisol is hypothetical; her purchases, payment schedule, account balances and the 10.5% and 24% rates are illustrative, not market quotes, and the interest is figured monthly on the starting balance for clarity, while lenders usually compute it daily. The self-employment tax figures assume net earnings below the Social Security wage base, and the example does not apply an income tax rate, state tax, the deduction for half of self-employment tax or the qualified business income deduction. Quotations come from 26 U.S.C. 163, 26 CFR 1.163-8T and 1.163-9T, IRS Publication 334 (2025 edition), IRS Publication 535 (2022 edition, the last before the IRS discontinued it) and the 2025 Schedule C instructions, and 2026 editions may differ. How the tracing and repayment-ordering rules apply to a particular card or line of credit depends on your agreement and records. Confirm the treatment with a CPA or enrolled agent before you file.