Loan Amortization Schedule

Month-by-month principal / interest / balance with optional extra-principal payment, total interest, payoff month.

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Formula and source

Payment P = (r * PV) / (1 - (1+r)^-n) where r is monthly rate and n is term in months. Schedule recurrence: interest_i = balance_(i-1) * r; principal_i = P - interest_i + extra; balance_i = balance_(i-1) - principal_i.

Standard mortgage / installment-loan formula. First principles.

Audience

This tile is built for accounting and the adjacent professions in the Accounting, Tax, and Small-Business group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.

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Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.