Amortization
Amortization is the process of paying off a loan through scheduled payments that each cover interest and a portion of principal, so the balance falls to zero by maturity. The amortization schedule sets exactly how much of every payment goes to interest versus principal over the life of the loan, and it is the schedule a servicer administers on each payment.
What Amortization Is
Amortization describes how a loan is repaid over time. Rather than paying only interest and returning the whole principal at the end, an amortizing loan is repaid in installments that each include interest plus a slice of principal, so the outstanding balance steadily declines to zero by the maturity date. Most term loans, mortgages, and equipment loans are amortizing. The schedule of those payments, showing the split between interest and principal for each period, is called the amortization schedule.
How the Interest and Principal Split Changes
In a standard (level-payment) amortizing loan, the payment stays the same each period, but its makeup shifts. Early on, most of the payment goes to interest because the balance is high; as the balance falls, more of each payment goes to principal. That is why paying down a loan feels slow at first and accelerates later, and why the interest cost of a loan is front-loaded. The amortization schedule makes this explicit, period by period.
Amortizing vs Interest-Only vs Bullet
Not every loan amortizes the same way, and the structure is set at origination:
- Fully amortizing. Each payment covers interest and principal, and the balance reaches zero at maturity.
- Interest-only. Payments cover only interest for a period, with principal unchanged, common in bridge and construction lending.
- Bullet or balloon. Little or no principal amortizes over the term, and a large balance is due at maturity, usually refinanced or repaid from a sale.
A revolving facility does not amortize on a fixed schedule at all: the borrower draws and repays freely up to a limit.
Why It Matters for Servicing
The amortization schedule is the backbone of loan servicing. Every payment has to be applied against it, splitting the money correctly between interest and principal, updating the balance, and reflecting any prepayment, which can shorten the schedule and may trigger a prepayment penalty. If payments are misapplied or the schedule drifts, balances and interest income become wrong, and the loan data funders rely on stops being trustworthy.
How Zolvo Fits
Zolvo automates exactly this work: applying and reconciling each payment against the loan's amortization schedule, keeping principal, interest, and balances accurate, and reflecting prepayments and payoffs, on top of the systems a lender already runs. See payment matching and reconciliation.
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