Is Interest Expense a Debit or Credit?
Interest expense is a debit. Expenses increase with debits, so interest charged on loans and credit lines is debited to interest expense. Its normal balance is a debit, it is reported on its own line on a business return, and only the interest portion of a loan payment belongs in it.
- Account category
- Expense
- Normal balance
- Debit (Dr)
- Increases with
- Increase (Dr)
- Decreases with
- Decrease (Cr)
- Financial statement
- Income statement
Classifying one account is easy. Ledger IQ classifies the whole trial balance.
Try it freeInterest expense on a trial balance
| Acct # | Account | Debit | Credit |
|---|---|---|---|
| 1000 | Cash | 48,200.00 | |
| 1200 | Accounts receivable | 86,400.00 | |
| 1300 | Inventory | 72,500.00 | |
| 1500 | Equipment, net of depreciation | 82,000.00 | |
| 2000 | Accounts payable | 31,500.00 | |
| 2400 | Notes payable | 85,000.00 | |
| 3900 | Equity, beginning of year | 172,600.00 | |
| 4000 | Sales revenue | 550,000.00 | |
| 4100 | Sales returns and allowances | 12,000.00 | |
| 4200 | Interest income | 1,200.00 | |
| 5000 | Cost of goods sold | 240,000.00 | |
| 6000 | Salaries and wages | 96,000.00 | |
| 6050 | Officer compensation | 60,000.00 | |
| 6060 | Payroll taxes | 11,900.00 | |
| 6100 | Rent expense | 36,000.00 | |
| 6150 | Insurance expense | 14,400.00 | |
| 6200 | Utilities expense | 9,600.00 | |
| 6250 | Advertising expense | 7,200.00 | |
| 6275 | Meals | 4,800.00 | |
| 6300 | Depreciation expense | 19,000.00 | |
| 6350 | Amortization expense | 4,000.00 | |
| 6400 | Bad debt expense | 3,500.00 | |
| 6450 | Interest expense (the account this page is about) | 6,800.00 | |
| 6900 | Other operating expenses | 26,000.00 | |
| Total | 840,300.00 | 840,300.00 |
Example journal entries
| Account | Debit | Credit |
|---|---|---|
| Notes payable | 15,000.00 | |
| Interest expense | 4,800.00 | |
| Cash | 19,800.00 |
| Account | Debit | Credit |
|---|---|---|
| Interest expense | 2,000.00 | |
| Accrued expenses | 2,000.00 |
Why it works that way
Interest is the cost of using someone else's money, which makes it an expense, and expenses are debits. The whole difficulty is isolating it, because interest usually arrives inside a payment that also repays principal.
One payment, two entries
A loan payment reduces the note payable by the principal portion and hits interest expense for the rest. The lender's amortization schedule gives the split.
The two failure modes are easy to spot on a trial balance. All of the payment posted to interest leaves the loan balance frozen at its original amount while interest expense is far too high. All of it posted to principal makes the loan amortize too fast and loses the deduction entirely. The check is to compare the ending loan balance to the lender's December statement.
Credit card finance charges are the same idea in miniature. They are interest, not purchases, and they belong here rather than in whatever expense account the rest of the statement was coded to.
Not every interest cost is deductible here
Interest on a C corporation federal tax underpayment is generally not deductible.
Investment interest on a pass through return is separately stated on Schedule K rather than deducted on page 1, because the limitation is applied at the owner level.
Interest during construction may have to be capitalized into the asset rather than deducted.
Interest on a loan whose proceeds went to the owner personally is not a business deduction, however the note is titled. A shareholder loan where the money never reached the business is the common version.
The section 163(j) limitation
Business interest deductions can be limited to a percentage of adjusted taxable income, with a small business exemption based on average annual gross receipts over the prior three years. Most closely held clients fall under the exemption, and those that do not need Form 8990.
It is worth knowing which side of the threshold a client sits on before assuming the full balance is deductible, particularly for a leveraged business whose receipts have grown.
Where it fits in the accounting equation
Tax return treatment
| Form | Line |
|---|---|
| Form 1120 | Page 1 line 18, interest, subject to the section 163(j) limitation |
| Form 1120S | Page 1 line 13, interest, with investment interest separately stated on Schedule K |
| Form 1065 | Page 1 line 15, interest, with investment interest on Schedule K |
Common questions
Is interest expense a debit or credit?
A debit. It is an expense. The credit is cash when it is paid, or an accrued liability when it is owed at year end and paid later.
Is the whole loan payment deductible?
No. Only the interest portion. The principal portion reduces the loan liability on the balance sheet and is not a deduction. The lender amortization schedule provides the split, and the ending loan balance should agree with the lender statement.
Are credit card finance charges interest expense?
Yes. Interest and finance charges on a business card are interest expense, reported on the interest line of the return rather than mixed in with the purchases on the statement.
Is business interest always fully deductible?
Not always. Section 163(j) can limit the deduction based on adjusted taxable income, though a small business exemption based on average gross receipts covers most closely held clients. Investment interest on a pass through return is separately stated on Schedule K rather than deducted on page 1.
Related answers
Last reviewed October 17, 2026.