A practical next step · Free borrowing tools
See how payment dates affect interest
Compare two dates for one payment, or check multiple planned and posted payments using a simple daily-interest model.
How this calculator works · Page and input checks by FinToku ·
One payment, two possible dates
Compare simple interest accrued before an otherwise identical payment. This is an educational timing model, not a statement or payoff quote.
Choose dates within 366 days after the balance date.
What this assumes
Interest = principal × annual note rate × elapsed days ÷ 365. No interest is outstanding on the balance date. The model excludes that date, includes the payment date, and applies payment to accrued interest before principal. Unpaid interest stays separate and is not capitalized. No intervening transactions, fees, compounding or contractual day-count variations are included. A smaller payment may leave unpaid interest.
Different dates are different observation points. The displayed difference concerns interest accrued before payment, not lifetime savings. Keep contractual due dates and possible late charges separate.
Understand dated payoff quotes →Compare planned and posted payments over time
Use the balance and note rate from your records, then compare the same payments on their planned and actual posting dates. Leave an actual date blank if the payment hasn’t posted by the checkpoint, including a returned payment that never cleared.
The model accrues simple interest on principal using actual elapsed days and a 365-day year. It applies payments to unpaid interest first and then principal, up to the modeled amount due. It carries unpaid interest separately without compounding. It excludes penalties, fees, contract-specific posting rules and adjustments after a returned payment. The checkpoint is a modeled balance, so request a dated payoff quote from your lender if you intend to pay off the loan. Inputs stay in this tab.
OppLoans on early payoff and uncleared payments · CFPB explanation of simple and precomputed interest