Is interest tax deductible?
Usually yes — when the debt is properly tied to your business. Business interest can be deductible when borrowed money funds business activity. The key is tracing how the proceeds were used, separating personal and business debt, and applying any business-interest limitation that affects you.
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On this page: Short answer · Who this applies to · The tracing rule · Interest types · When it's deductible · When it's not deductible · Mixed-use debtInterest limit · · Schedule C · Example · Records · IRS sources · Specific lookups · FAQ
Short answer
Generally yes for business interest. Interest is classified by how the borrowed funds are used, not by whether the account is labeled “business” or “personal.” Personal interest is generally not a Schedule C expense.
On the latest finalized Schedule C, most nonmortgage business interest is reported on Line 16b. Business real-property mortgage interest can be Line 16a or 16b depending on the lender and reporting facts described below.
Who this typically applies to
- Self-employed people using loans or credit cards to pay business costs
- Small business owners using term loans, lines of credit, SBA financing, or equipment financing
- Contractors and tradespeople financing inventory, tools, vehicles, or operating costs
- Business owners carrying balances on cards used for business purchases
The tracing rule: The use of the money controls
Interest allocation generally follows how the debt proceeds are actually used. The collateral, lender, account name, or “business loan” label does not by itself decide the tax treatment.
- Business loan → business costs: business-interest treatment
- Business loan → personal spending: personal-interest treatment for that portion
- Personal loan/card → business use: the properly traced business portion can be business interest
- Borrowed funds parked in an account: the allocation can change when those proceeds are later spent
- Mixed-purpose debt: repayments can change the remaining business/personal allocation over time
Keeping borrowed proceeds separate until they are spent makes the tracing much easier to document.
Interest types: Deductibility at a glance
| Interest type | General treatment | Where it may be reported |
|---|---|---|
| Business loan / line of credit | Business-use interest generally deductible | Schedule C Line 16b |
| Credit card debt from business purchases | Business portion generally deductible | Schedule C Line 16b |
| Business real-property mortgage | Business interest, subject to reporting rules | Line 16a if paid to a bank/financial institution and supported by Form 1098 or similar statement; otherwise generally Line 16b |
| Self-employed vehicle loan | Business-use share can be deductible | Schedule C under the vehicle-interest rules |
| Personal home mortgage | Not automatically a business deduction | Schedule A and/or Form 8829 depending on the facts |
| Investment borrowing | Investment-interest rules, not Schedule C business interest | Usually Form 4952 / Schedule A if applicable |
| Purely personal consumer debt | Generally not a Schedule C deduction | Not Schedule C |
Separate current rule: for 2025–2028, some qualifying personal passenger-vehicle loan interest can be deductible on Schedule 1-A, subject to its vehicle, loan, income, and annual-limit rules. That is not the same as claiming business interest on Schedule C.
FreshBooks — Organize business interest and financing costs
Keep loan and card costs categorized with the records that support how borrowed funds were used for the business.
When business interest is deductible
- You are legally liable for the debt
- You and the lender intend that the debt will be repaid
- There is a genuine debtor-creditor relationship
- The debt is properly traced to an ordinary business use
- You deduct the interest under your accounting method and do not deduct prepaid interest before the period it applies to
When interest is not a Schedule C business deduction
- The debt is traced to personal purchases, living costs, or vacation spending
- The borrowed funds are traced to investment activity rather than your trade or business
- The debt is used to buy or carry tax-exempt obligations
- The arrangement is not a genuine debt with an enforceable obligation to repay
- The interest must be capitalized or is limited under another tax rule
Deducting interest on mixed-use debt
Only the portion properly allocated to business use is business interest. A simple proceeds percentage can be useful when one loan is disbursed once for clearly identified uses, but the allocation can change when proceeds are spent later or principal is repaid.
Simple one-time disbursement example
- Loan proceeds: $20,000
- $15,000 immediately used for business inventory
- $5,000 immediately used personally
- Before later reallocations, 75% of the debt is business and 25% is personal
- If $1,200 of interest applies while that allocation remains unchanged, $900 is business interest
For revolving credit, delayed spending, refinanced debt, or changing balances, do not assume the original percentage stays fixed. Track the debt allocation over time.
Can the business-interest deduction be limited?
Yes. Section 163(j) can limit business-interest deductions for taxpayers that do not qualify for an exception. For tax years beginning in 2026, the inflation-adjusted small-business gross-receipts threshold is $32 million, generally measured using average annual gross receipts for the prior three tax years.
A qualifying small-business taxpayer that is not a tax shelter is generally exempt from the Section 163(j) limitation. If the limitation applies, Form 8990 is used before completing Schedule C Lines 16a and 16b, and disallowed business interest can generally carry forward.
Aggregation and tax-shelter rules can affect whether the small-business exception applies.
Where business interest goes on Schedule C
Latest finalized Schedule C treatment:
- Line 16a: mortgage interest on real property used in the business when paid to a bank or other financial institution and supported by Form 1098 (or a similar statement).
- Line 16b: other deductible business interest, including most business loans, lines of credit, and business credit card interest. Business mortgage interest can also fall here when the Line 16a reporting condition is not met.
Final 2026 Schedule C instructions are not yet available as of August 18, 2026. Confirm final line numbering when filing.
TurboTax — Report deductible business interest
Use the business-interest section for the deductible amount after any required tracing, mixed-use allocation, or Form 8990 limitation.
Example: Different kinds of interest for one business owner
- Term loan used for equipment: deductible business interest, generally Line 16b
- Dedicated business credit-card balance: deductible business interest, generally Line 16b
- Mixed-use car loan: business-use share can be deductible on Schedule C under vehicle rules; a qualifying personal-use share may separately fit Schedule 1-A, but the same interest cannot be deducted twice
- Student-loan interest: not Schedule C business interest; separate individual rules apply
What records to keep
- Loan agreements and lender/card statements showing interest
- Bank records showing where borrowed proceeds were deposited and how they were spent
- Receipts or invoices for major business expenditures funded with debt
- For mixed-use debt, a worksheet showing changes in the business/personal allocation
- Form 1098 or similar statements for applicable business real-property mortgage interest
FAQ
Is business interest tax deductible?
Generally yes when the debt is properly allocable to your trade or business and you have a genuine debtor-creditor relationship. Most nonmortgage business interest is reported on Schedule C Line 16b, subject to any applicable limitation.
Does it matter what the loan was used for?
Yes. Interest is generally classified by tracing how the borrowed funds were used. A loan labeled business can create personal interest if its proceeds are spent personally, while a personally titled loan can create business interest when its proceeds are properly traced to business use.
Can I deduct interest on mixed-use debt?
Only the portion properly allocated to business use is business interest. The allocation can change as proceeds are spent and principal is repaid, so a fixed original percentage is not always accurate for revolving or changing balances.
Where does business interest go on Schedule C?
On the latest finalized Schedule C, most other business interest goes on Line 16b. Line 16a is for qualifying mortgage interest on business real property paid to a bank or other financial institution when supported by Form 1098 or a similar statement; some other business mortgage interest is reported on Line 16b.
Can the business-interest deduction be limited?
Yes. Section 163(j) can limit business interest for taxpayers that do not meet an exception. For 2026, the small-business gross-receipts threshold is $32 million, subject to tax-shelter and aggregation rules.
Looking for other deductible expenses? See the full Expense Deductibility Guide.
Last reviewed: August 18, 2026