To calculate interest receivable, multiply the loan or note’s principal by its annual interest rate, then multiply that result by the fraction of the year that has passed since interest was last paid or the note was issued. The product is the dollar amount you record as a current asset on the balance sheet and as earned revenue on the income statement through an adjusting journal entry at the end of the period.
The formula in full:
Interest Receivable = Principal × Annual Interest Rate × (Time Elapsed ÷ Time in a Year)
The Three Inputs
Principal is the original amount lent or invested, taken directly from the promissory note, loan agreement, or bond indenture. It does not change unless the contract calls for compounding or a principal adjustment.
The annual interest rate is the rate stated in the contract, converted to decimal form before you multiply. Six percent becomes 0.06. Nine percent becomes 0.09. Interest rates are almost always quoted annually, even on short-term notes, which is why the time fraction exists: it scales the full-year figure down to only the portion you have actually earned.
Time elapsed is the period between the start of the accrual (either the disbursement date or the last interest payment) and your reporting cutoff. This is where most calculation errors originate, because the numerator and denominator have to match the day-count convention the contract uses.
Pick the Right Day-Count Convention
The denominator of your time fraction depends on how the contract counts days. Two conventions cover most situations, with a third common in commercial lending.
- 30/360. Every month is treated as 30 days and every year as 360. Corporate, municipal, and agency bonds in the U.S. commonly use this method because it makes monthly interest calculations uniform.
- Actual/365. Count the real calendar days that have passed and divide by 365. Consumer lending, government bond reporting, and many international markets follow this convention.
- Actual/360. Count real calendar days but divide by 360. Commercial bank loans often use this hybrid, and it produces slightly more interest than Actual/365 on the same principal because the denominator is smaller.
The loan agreement or bond indenture will specify which one applies. If you are working in whole months rather than days, the denominator is simply 12, so a three-month accrual is 3/12. To find the numerator in days, count every day from the start of the accrual period through your reporting date.
A Worked Example
Your business holds a $10,000 promissory note earning 9% annual interest. Sixty days have passed since the note was issued, and the contract specifies a 360-day year.
$10,000 × 0.09 × (60 ÷ 360) = $150.00
Broken into steps: $10,000 × 0.09 = $900, which is the full year’s interest. Then $900 × (60 ÷ 360) = $150, which scales the annual figure to the 60 days the money was actually out.
Now change the convention. Say the note was issued November 1, your fiscal year ends December 31, and the contract uses Actual/365. That is 61 actual calendar days:
$10,000 × 0.09 × (61 ÷ 365) = $150.41
Same principal, same rate, different convention, different answer. The gap is small on a single note. Across a portfolio it compounds.
The Journal Entry
Once you have the dollar figure, record it through an adjusting entry dated the last day of the accounting period. The entry has two sides:
- Debit Interest Receivable for the calculated amount. This increases the current asset on your balance sheet.
- Credit Interest Income (sometimes labeled Interest Revenue) for the same amount. This recognizes the revenue on your income statement.
Using the first example, the December 31 entry debits Interest Receivable $150 and credits Interest Income $150. No cash has moved, but your books now reflect the interest you earned during the period. Accrual-basis accounting requires this. Skipping it understates both assets and income.
Clearing the Receivable When Payment Arrives
The receivable stays on the balance sheet until the borrower pays. When cash arrives, a second entry closes it out.
If the payment matches exactly what you accrued, debit Cash and credit Interest Receivable. The receivable goes to zero and cash rises by the same amount.
More often, additional interest has accrued between your last adjustment and the payment date, so the credit side splits. Suppose you accrued $150 on December 31 and the borrower pays $200 of interest on January 17. Debit Cash $200, credit Interest Receivable $150 to clear the prior accrual, and credit Interest Income $50 to recognize the January portion.
If the borrower also repays principal at the same time, add a credit to Notes Receivable for the principal amount. Total cash received equals principal plus all interest, and every affected account clears.
When to Use Compound Interest Instead
The simple formula covers most notes receivable, short-term loans, and bonds that pay interest on a regular schedule. Some instruments compound, meaning unpaid interest gets added to the principal and itself starts earning interest.
The compound formula is:
A = P × (1 + r/n)^(n×t)
P is principal, r is the annual rate in decimal form, n is the number of compounding periods per year, and t is the number of years. Subtract P from A to isolate the interest earned.
Match n to what the contract actually specifies: daily compounding sets n at 365, monthly at 12, quarterly at 4. Over a month or a quarter, the difference between simple and compound interest is small. Over years, it becomes significant. For long-term receivables acquired at a discount or premium, U.S. accounting rules generally point to the effective interest method, which applies a constant rate to the receivable’s carrying amount each period.
When to Stop Accruing
Interest does not keep accruing on paper forever if the borrower stops paying. Banking regulations require lenders to place a loan in non-accrual status once it is 90 days past due on either principal or interest, unless the loan is both well-secured and actively being collected.1Federal Reserve. Past-Due and Nonaccrual Assets
When a loan moves to non-accrual, reverse any interest receivable already recorded on it. Debit Interest Income and credit Interest Receivable. From that point, interest income is recognized only when the borrower actually sends cash. The loan stays in non-accrual until it is brought current or restructured.
If the receivable becomes uncollectible, write it off. Under the allowance method, debit Allowance for Doubtful Accounts and credit Interest Receivable; the expense was already estimated when you built the allowance, so the write-off itself does not hit the income statement again. Under the direct write-off method, debit Bad Debt Expense and credit Interest Receivable at the point you determine the amount will not be collected.