What is an amortization schedule?
An amortization schedule is the period-by-period table that shows how a loan is repaid over time. For each payment date it lists the payment due, the portion that goes to interest, the portion that pays down principal, and the remaining balance after the payment. Run to the end, the schedule drives the balance to zero.
The defining feature of an amortizing loan is the split between interest and principal. Early on, most of each payment covers interest because the outstanding balance is large; over time, as the balance falls, more of each payment goes to principal. The total payment can stay level while its composition shifts.
In leveraged finance, the schedule matters because not all debt amortizes the same way. A term loan A repays meaningful principal across its life on a defined schedule; a term loan B amortizes only a token amount each year with the bulk due at maturity; a bond often amortizes nothing until a single bullet repayment at the end.
How the schedule is built
Building a schedule is mechanical once the loan terms are fixed.
- Start with the terms. Principal, interest rate, payment frequency, and the amortization structure (level, fixed percentage, or bullet) define the table.
- Compute the interest portion. For each period, interest equals the outstanding balance times the periodic rate. On a floating-rate loan, that rate resets with the benchmark, so the interest column moves with SOFR.
- Apply principal. The scheduled principal payment reduces the balance. Mandatory prepayments and cash flow sweeps reduce it further, often shortening the schedule.
- Carry the balance forward and repeat each period until the balance is zero. The final period clears any remaining principal, including a bullet at maturity.
Why it matters in a deal
The amortization schedule is the backbone of a debt forecast. It tells a sponsor exactly how much cash the business must produce each period to stay current, which feeds directly into the debt service coverage ratio and the free cash flow available for dividends or reinvestment.
It is also where prepayments and refinancings show up. A voluntary paydown or a sweep reshapes the remaining schedule; a refinancing replaces it entirely with a new one. Because the schedule is a moving object — repriced when rates change, shortened when the borrower sweeps cash — keeping the current version accurate is essential to any reliable cash forecast.