An interest credit on a mortgage is a dollar-for-dollar adjustment your lender applies at closing so you only pay interest starting from the day your loan actually funds. It typically appears when you close in the first few days of a month, and while it reduces your cash to close, it also shortens the window before your first monthly payment is due.
Why the Timing Gap Exists
Mortgage interest is paid in arrears. Each monthly payment covers the interest that accrued during the previous month, so a February 1 payment covers January’s interest, a March 1 payment covers February’s, and so on.1University of California Office of the President. Interest in Arrears That backward-looking system is standard on residential mortgages.
At closing, though, your loan funds on a specific date, and your first monthly payment won’t arrive for weeks. To cover the interest that accrues between the funding date and the end of that calendar month, lenders collect prepaid interest, sometimes called per diem interest, at the closing table.2Consumer Financial Protection Bureau. What Are Prepaid Interest Charges? Close on June 15, and you pay 16 days of per diem at closing to cover June 15 through June 30. Your first monthly payment then arrives August 1 and covers July.
When You Actually Receive a Credit
The math flips when your loan funds on or very near the first of the month. Close on June 1, and prepaying interest for the rest of the month would be nearly 30 days of per diem, essentially a full month upfront. Your first scheduled payment on July 1 would then cover that same period again, double-charging you. The interest credit exists to prevent that overlap.
In practice, credits show up most often when closings land between the 1st and the 5th. The lender counts the days between the start of the calendar month and the actual funding date and credits you for those days. If the loan funds on the 3rd, you receive a credit for the 1st and 2nd. The credit adjusts the prepaid interest line so you’re only charged from the day you held the debt forward.
Interest begins accruing the moment the loan is funded and the transaction is recorded. On a purchase, that’s typically the day you sign and the title company disburses funds, though some states allow a short gap between signing and recording.
How the Per Diem Is Calculated
Start with your daily interest cost. Multiply the loan amount by the annual rate as a decimal, then divide by the number of days in the year. On a $300,000 loan at 6.5%, that’s $19,500 in annual interest.
Which day count applies matters. Loans sold to Fannie Mae or Freddie Mac typically use a 360-day year, the standard convention for secondary market mortgages. Portfolio lenders keeping loans on their own books sometimes use 365 days instead. The gap isn’t trivial: 360 days produces $54.17 a day in this example, and 365 days produces $53.42. Your Loan Estimate and Closing Disclosure will show which convention your lender uses.
Then multiply the per diem by the credited days. Using the 360-day figure, a three-day credit is $54.17 × 3, or $162.51. On a larger loan or higher rate, those few days add up.
How It Affects Your First Payment Date
This is where the credit surprises borrowers. With a typical mid-month close, you get a fairly long runway before the first payment. Close on June 15, and your first payment isn’t due until August 1, roughly 45 days later. People come to expect that gap.
When you close in the first few days of a month and receive an interest credit, your first payment often falls on the first of the very next month. Close on June 2, and July 1 may be your first due date, just 29 days later. The closing-month interest has already been settled through the credit, so the loan moves directly into its normal monthly cycle. Early-month closings naturally compress the timeline.3Fannie Mae. General Requirements for Good Delivery of Whole Loans
Budget for it. If you’ve heard you’ll “skip a month” after closing, an early-month close with an interest credit eliminates most or all of that cushion.
Where to Find It on the Closing Disclosure
Prepaid interest charges and credits appear on Page 2 of your Closing Disclosure in Section F, labeled “Prepaids.”2Consumer Financial Protection Bureau. What Are Prepaid Interest Charges? The line shows the daily interest amount, the number of days being charged or credited, and the rate used.4Consumer Financial Protection Bureau. 12 CFR 1026.37 Content of Disclosures for Certain Mortgage Transactions (Loan Estimate) When the adjustment produces a credit, it lowers your cash to close.
Don’t confuse this with “Lender Credits,” which sit in a separate section and reflect rate-related concessions, such as accepting a higher rate for lower closing costs.5Consumer Financial Protection Bureau. 12 CFR 1026.38 Content of Disclosures for Certain Mortgage Transactions (Closing Disclosure) An interest credit isn’t a discount or a negotiated benefit. It’s a timing correction. Check the math yourself: the per diem times the credited days should match the credit amount exactly.
How Refinances Change the Picture
When you refinance the mortgage on your primary residence, a three-business-day right of rescission applies. During that window, the lender cannot disburse funds. The lender is, however, permitted to accrue finance charges during rescission, meaning interest on your new loan may start before you receive the money.6Consumer Financial Protection Bureau. 12 CFR 1026.23 Right of Rescission
That creates a wrinkle on refinances. If you sign on the 1st but rescission pushes actual funding to the 4th, the per diem calculation starts from the funding date. You may also be paying interest on the old loan through its payoff date, so review your payoff statement and Closing Disclosure side by side and confirm you aren’t being charged for the same days twice. Purchase transactions carry no rescission period, so signing and funding generally happen the same day.
Tax Treatment
Prepaid interest paid at closing counts as mortgage interest for tax purposes. If you itemize, the per diem interest you pay at closing is deductible in the year you close. Your lender reports total mortgage interest received during the calendar year in Box 1 of Form 1098, including any prepaid interest collected at closing.7IRS.gov. Instructions for Form 1098
An interest credit reduces the prepaid interest amount, which in turn reduces the deductible interest for that year. On a $300,000 loan at 6.5%, a three-day credit is around $160, so the tax effect is small. If you’re closing near year-end and tracking deductions closely, though, the timing can shift which tax year the interest falls in.