Amortisation

Definition

Amortisation (US spelling: amortization) is the scheduled reduction of loan principal through regular payments. On a standard fixed-instalment personal loan, each payment covers that month’s interest on the outstanding balance and uses the remainder to cut principal. Early payments are typically interest-heavy; later payments are principal-heavy. An amortisation schedule lists each month’s payment, interest, principal and remaining balance.

Amortisation is the process; EMI (or monthly repayment) is the level cash amount that drives the process when the rate and term are fixed. You can know your EMI without ever opening a schedule — but the schedule is what shows why early overpayments often save more interest than the same cash late in the term.

Why amortisation matters for personal loans

UK personal loans are usually amortising: you are not paying interest-only for years with a balloon at the end (that structure belongs to other products). Reading a schedule helps you check a lender illustration, decide whether a lump-sum overpayment is worth requesting, and see how much interest remains if you settle early. It also stops the common surprise that “I’ve paid for a year but the balance barely moved” — that pattern is normal early on a reducing-balance loan, not necessarily an error.

Amortisation tables also support payoff strategy. Extra payments reduce principal sooner, so future interest accrues on a smaller balance. Consolidation and refinance decisions should look at the remaining schedule, not only the new monthly figure.

Worked EXAMPLE — Loan A schedule snapshot

All figures below are labelled EXAMPLE. They are illustrative only — not a live quote and not a credit offer.

EXAMPLE Loan A: £8,500 · 24.9% EXAMPLE · 48 months · £0 fee. The level payment is about £281.36 EXAMPLE per month. In month 1, interest on £8,500 at 24.9% EXAMPLE annual (monthly rate ≈ 2.075%) is roughly £176 EXAMPLE; the rest of the payment (about £105 EXAMPLE) reduces principal. By later months the interest slice is smaller and more of the same £281.36 EXAMPLE clears balance. Total interest over the full term is about £5,005 EXAMPLE under those assumptions.

Open the amortisation schedule calculator with the same inputs to scroll the full table. Pair it with the extra-payment tool if you want to see months cut when you add a regular overpayment.

How LoanCalc Lab uses it

LoanCalc Lab builds schedules from reducing-balance inputs. Longer explainers: amortisation explained and how to read an amortisation schedule.

Common mistakes

• Expecting principal to fall evenly from month one on a level-payment loan.
• Reading an on-site schedule as a lender statement or early-settlement figure.
• Ignoring that a rate change, fee capitalisation or payment holiday would rewrite the remaining rows.
• Comparing schedules with different day-count or compounding assumptions as if identical.

Try it with your numbers

Put your own figures into the amortisation schedule calculator. All results are illustrative EXAMPLES. Related terms: settlement figure and total amount payable.

What it is not

An on-site schedule is not a lender statement, not a settlement figure, and not advice to borrow or overpay. LoanCalc Lab is not a lender. Last checked 26 October 2026.