Business Loan Tax Benefits: Interest, Fees, and Depreciation

When your business takes out a loan, the tax code hands you three separate deductions to work with: the interest you pay on the debt, the fees you paid to get the loan, and the cost of whatever you bought with the money. The loan principal itself is neither income when you receive it nor a deduction when you pay it back. Understanding these business loan tax deductions matters more in 2026 than in most recent years, because the Section 179 expensing cap sits at $2,560,000 and 100% bonus depreciation has been permanently restored for qualifying property acquired after January 19, 2025.

Loan Proceeds Are Not Income, and Principal Is Not Deductible

Cash from a loan does not appear on your income tax return. You owe every dollar back, so nothing has changed about your net worth. That rule holds for bank term loans, SBA-backed loans, lines of credit, and equipment financing alike.

The rule cuts both ways. Because the principal was never taxed, paying it back is never deductible. Only the cost of borrowing produces tax benefits. Keep that line clear in your head and the rest of the picture falls into place.

Deducting Interest on Business Debt

Interest is where most of the tax savings live. Federal law lets you deduct all interest paid or accrued during the year on legitimate business debt.¹ That covers term loans, lines of credit, equipment financing, commercial mortgages, and business credit cards used only for business.

The arrangement has to look like real debt. The IRS and the Tax Court look for a written loan agreement, a stated interest rate, a fixed repayment schedule, collateral or security, and actual on-time payments. Informal advances between family members or partners with no repayment terms will not survive scrutiny. If the IRS recharacterizes the arrangement as a gift or an equity contribution, the interest deduction goes away.

For most small businesses, the deduction is unlimited. Every dollar of business interest reduces gross income dollar for dollar. A ceiling kicks in for larger companies, but if your average annual gross receipts over the prior three tax years are $32 million or less, that ceiling does not apply to you.²

The Cap for Larger Businesses

Above that $32 million threshold, the deduction is capped at the sum of your business interest income, 30% of adjusted taxable income, and any floor plan financing interest.¹ A company with $1 million in adjusted taxable income and no interest income could deduct up to $300,000 in business interest that year. Anything disallowed carries forward to future years under the same rules. Businesses subject to the cap file Form 8990 with their return.³ Electing real property trades or businesses, electing farming businesses, and regulated utilities can opt out of the limitation, though the trade-off is losing eligibility for some depreciation benefits.

Tracing Interest on Mixed-Use Loans

Depositing loan proceeds into an account that also holds personal funds is where deductions get lost. The IRS does not let you call all the interest “business interest” just because the loan is in the company’s name. Federal regulations require you to trace where the borrowed money actually went. Interest follows the use of the proceeds, not the collateral, not the label on the loan.⁴

Say you borrow $100,000, deposit it in a general account, and spend $70,000 on inventory and $30,000 on a personal vehicle. Only 70% of the interest is deductible; the remaining 30% is nondeductible personal interest. When borrowed funds are mixed with other money in the same account, ordering rules apply: the borrowed funds are generally treated as spent before any unborrowed money already in the account.⁴

The cleanest fix is a dedicated account. Deposit loan proceeds there, make business purchases from there, and the tracing question rarely comes up. If you must commingle, keep detailed records showing which expenditures came from borrowed money. The IRS wants documentation sufficient to clearly show your income and expenses, and interest tracing is one area where sloppy bookkeeping costs real deductions.⁵

Loan Fees and Closing Costs

Origination fees, application fees, appraisal costs, and similar charges to obtain business financing are deductible, but not all at once. These costs are capitalized and spread evenly over the life of the loan through amortization.

The math is easy. Pay $6,000 in closing costs on a six-year term loan, and you deduct $1,000 each year the loan is outstanding. Your closing disclosure or settlement statement is the anchor document. Keep it for as long as the loan remains open plus the standard record-retention period. Missing a year’s amortized deduction means the deduction is gone; the IRS will not let you bunch skipped amounts into a later year.

Deducting Assets You Bought with the Loan

The equipment, vehicles, or other property you finance produce their own deductions on top of the interest and fees. Two provisions do most of the work: Section 179 expensing and bonus depreciation. Both apply in full even though you borrowed the money.

Section 179

Section 179 lets you deduct the full cost of qualifying equipment, machinery, software, and certain other property in the year you place it in service.⁶ For 2026, the maximum deduction is $2,560,000. It phases out dollar for dollar once total qualifying property placed in service exceeds $4,090,000, which keeps the benefit aimed at small and mid-sized companies. SUVs eligible for Section 179 are capped at $32,000.²

Pair this with financing and the cash-flow benefit is real. Borrow $500,000 for manufacturing equipment, put it in service this year, and you can deduct the full $500,000 from taxable income even though the loan takes five years to repay. That front-loaded deduction takes some of the sting out of the early payments.

Bonus Depreciation

Bonus depreciation had been scheduled to drop to 40% for 2025. The One, Big, Beautiful Bill, enacted in 2025, permanently restored 100% bonus depreciation for qualifying property acquired after January 19, 2025.⁷ The full cost of eligible property (vehicles, furniture, manufacturing equipment, computer software, and qualified improvement property) is deductible in the first year.

Bonus depreciation reaches property Section 179 does not, including used assets that are new to you and property with a recovery period of 20 years or less. There is no dollar ceiling, so businesses making very large capital investments lean on it heavily.

What Happens When You Refinance

Refinancing offers a timing benefit that borrowers often miss. When you pay off an existing loan before its term ends, any unamortized fees from the original loan (those closing costs you had been deducting a slice at a time) can generally be deducted in full in the year the original loan is retired. The debt those costs were spreading over no longer exists, so the remainder becomes a current-year expense.

Take a five-year loan with $5,000 in closing costs. Refinance after three years, and you have already deducted $3,000. The remaining $2,000 is fully deductible in the year you close out the old loan. Same lender or different lender, the rule is the same.

The new loan begins its own amortization schedule for any fees on the refinancing. Interest on the new loan stays deductible as long as the proceeds serve a business purpose. If you take extra cash out during the refinancing and spend some of it personally, the tracing rules come back into play; you must split the interest between deductible business use and nondeductible personal use.

When Forgiven Debt Becomes Taxable

If a lender forgives part or all of your business debt, the IRS generally treats the forgiven amount as taxable income. The reasoning is the mirror of the rule that keeps loan proceeds off your return: the loan was excluded because you owed it back, and once the obligation disappears, you have a real gain in wealth.⁸ A lender that cancels $50,000 of business debt will typically report it on Form 1099-C, and you include it in gross income for the year.

Several exclusions can reduce or eliminate the tax:

Discharge in a Title 11 bankruptcy case under the jurisdiction of the court.
Insolvency, where your total liabilities exceed the fair market value of your total assets immediately before the discharge; the exclusion is limited to the amount by which you are insolvent.
Qualified farm debt owed by a farmer to a qualified lender.
Qualified real property business debt, for taxpayers other than C corporations, secured by business real property.

These exclusions come from the same statute and follow a priority order. Bankruptcy takes precedence over insolvency, for example.⁹ Claiming an exclusion generally requires filing Form 982 and reducing certain tax attributes (net operating loss carryforwards, asset basis, and others) by the excluded amount.¹⁰ The exclusion saves tax now, but the attribute reduction may cost you more later.

State Rules Do Not Always Match

Federal deductions do not automatically follow you onto a state return. A number of states decouple from federal bonus depreciation, either disallowing it or requiring an add-back and a longer state depreciation schedule. As of 2026, more than a dozen states do not conform to the current federal bonus depreciation rules. Several states also impose their own Section 179 limits, sometimes well below the $2,560,000 federal cap. State treatment of the business interest limitation varies too. Some states adopt the federal rules automatically; others ignore them or run their own version.

The practical consequence: equipment you fully expensed federally may need to be depreciated over five, seven, or more years on your state return. That creates timing differences and more bookkeeping. If you operate in multiple states, expect different schedules in each. Check your state’s conformity rules before making a large loan-funded purchase.

Where to Claim the Deductions

Most small businesses claim interest and fee deductions on the same schedule they use for other expenses: Schedule C for sole proprietors, or the appropriate lines on Form 1065 for partnerships and Form 1120 or 1120-S for corporations. Section 179 elections go on Form 4562, which also handles depreciation. Financing an asset with a loan does not require any special form on its own.

The exception is the interest limitation. A business with business interest expense that does not qualify for the small business exemption files Form 8990 to calculate the allowable deduction and track any carryforward of disallowed interest.³

Records tie the whole picture together. The IRS puts the burden of proof on the taxpayer to substantiate deductions claimed on a return.⁵ For loan-related deductions, keep the loan agreement, amortization schedule, closing disclosure, monthly statements showing interest paid, and receipts for any assets purchased with borrowed funds. Hold onto everything for at least as long as the loan is open plus three years after you file the return on which the final deduction appears. When you are tracing interest on a mixed-use loan, your documentation should show where every dollar of loan proceeds went. Vague records are treated the same as no records when the IRS asks.

1
Office of the Law Revision Counsel. 26 USC 163 – Interest
2
Internal Revenue Service. Rev. Proc. 2025-32
3
Internal Revenue Service. Instructions for Form 8990
4
GovInfo. 26 CFR 1.163-8T – Allocation of Interest Expense Among Expenditures
5
Internal Revenue Service. Recordkeeping
6
Office of the Law Revision Counsel. 26 USC 179 – Election to Expense Certain Depreciable Business Assets
7
Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One, Big, Beautiful Bill
8
Internal Revenue Service. Topic No. 431, Canceled Debt – Is It Taxable or Not?
9
Office of the Law Revision Counsel. 26 USC 108 – Income from Discharge of Indebtedness
10
Internal Revenue Service. About Form 982, Reduction of Tax Attributes Due to Discharge of Indebtedness