An amortization schedule is the loan’s full diary: one row per payment, showing exactly where each dollar went. Lenders generate it automatically, but few explain how to read it — which matters, because the schedule is where you verify the rate you were quoted, see what paying extra would do, and spot a balloon payment hiding at the end. This page teaches the reading. To generate a schedule for your own numbers, use the business loan amortization calculator.
General information, not financial advice.
Every schedule, whatever the lender, is built from the same five columns (the standard definitions used by Crestmont and CFI):
| Column | What it means | How it is computed |
|---|---|---|
| Beginning balance | What you owe at the start of the period | The previous row’s ending balance |
| Payment | The fixed amount you pay | Set by the loan formula at signing |
| Interest | The cost portion of this payment | Beginning balance × the periodic rate |
| Principal | The debt-reducing portion | Payment − interest |
| Ending balance | What you owe after the payment | Beginning balance − principal |
Two checks you can run on any row: interest + principal must equal the payment, and each row’s ending balance must be the next row’s beginning balance. If either fails, the schedule is wrong.
Take a $100,000 loan at 8% APR over 60 months — a fixed payment of $2,027.64 (cross-checked against Jupid’s published schedule for the same loan). The monthly rate is 8% ÷ 12 ≈ 0.6667%.
Same payment, different anatomy — the interest slice shrinks every single month because it is always charged on a smaller balance.
It feels like a trick, but it is just arithmetic. Interest is charged on the outstanding balance, and the balance is never larger than at the start of the loan. On a long loan the effect is dramatic: the first payment on a 25-year loan can be more than 80% interest. On the 5-year example above the effect is milder — principal leads from the very first payment — because the shorter term forces a larger principal component from day one. Either way, the schedule front-loads interest because the debt is front-loaded, not because the lender reorders anything.
The crossover point (bizcalclab’s term) is the month in which the principal portion of your payment first exceeds the interest portion — the moment the loan starts paying itself down faster than it accrues cost. Where it lands depends on the rate and the term: higher rates and longer terms push it later. On the $100,000 example it has already passed by month 1; on a long-term loan at a higher rate it can sit years into the schedule. Watching the two columns converge toward the crossover is the quickest way to see a loan’s true shape.
Before you trust any schedule — your lender’s or a calculator’s — run three totals. The principal column must add up to exactly the original loan amount: every dollar you borrowed is repaid exactly once. The ending balance of the final row must be zero on a fully amortizing loan; if it isn’t, you are looking at a partial-amortization structure with money still owed at maturity. And the interest column’s total, divided by the principal, tells you the loan’s true carrying cost as a fraction of what you borrowed — on the example above, $21,658.37 of interest on $100,000 over five years, or about 21.7 cents per dollar borrowed. A schedule that fails any of the three checks has an error in it, and it is better found before signing than after.
Only three things rewrite a schedule after signing. Extra principal payments pull every later row forward — less interest, an earlier zero balance; model them in the amortization calculator rather than here. A variable-rate reset recomputes the payment on the remaining balance at the new rate, as worked through in fixed vs variable business loans. And refinancing ends the old schedule entirely and starts a new one — which is why the break-even test in when to refinance a business loan matters before you sign.
How do I read an amortization schedule? Row by row: each row is one payment. The interest column is that month’s beginning balance multiplied by the periodic rate (APR ÷ 12); the principal column is whatever is left of the payment; the ending balance is the beginning balance minus the principal (the structure of Crestmont’s “How to Read a Business Loan Amortization Table”). Interest plus principal must equal the payment on every row.
Why is so much of my first payment interest? Because interest is charged on the balance, and your balance is at its maximum on day one. On a $100,000 loan at 8%, the first payment carries $666.67 of interest against $1,360.97 of principal; as the balance falls, the same fixed payment carries less interest and more principal every month. Nothing is being front-loaded deliberately — the charge follows the debt.
What is the amortization crossover point? The month when the principal part of your payment first becomes larger than the interest part (bizcalclab’s term). It arrives early on short, low-rate loans and years in on long, high-rate ones. After the crossover, each payment reduces your balance faster than the previous one did.
Sources: Crestmont Capital, amortization schedule guides (column definitions; reading a schedule); Corporate Finance Institute, amortization schedule reference; Jupid, published $100,000 / 8% / 60-month schedule (cross-check); bizcalclab (crossover point terminology). Currency verified 2026-10-23.