A UK mortgage amortisation schedule shows the month by month split between interest and capital on a repayment mortgage. Early payments usually cover more interest because the balance is larger, while later payments usually clear more capital. The schedule helps you see how quickly your balance may fall, how much interest you could pay overall, and what overpayments might change.

What an amortisation schedule means in the UK

An amortisation schedule is a repayment timetable. It starts with the amount borrowed, the interest rate, the mortgage term, and the repayment type, then estimates each monthly payment and the remaining balance after each payment.

For a repayment mortgage, also called a capital and interest mortgage, each payment has two parts. One part covers the interest charged for the period. The other part reduces the capital you owe. MoneyHelper explains the difference between repayment and interest-only mortgages, including that a repayment mortgage gradually pays off both the interest and the amount borrowed (MoneyHelper, 2026).

This is why the split changes over time. At the start, the lender is charging interest on a larger balance. Near the end, the balance is smaller, so more of the same payment can go towards clearing the debt.

Why the repayment split is useful

The monthly payment alone does not tell the whole story. A schedule can show whether a lower monthly payment is genuinely cheaper, or whether it simply stretches the debt over a longer period and increases total interest.

For example, a £220,000 repayment mortgage over 25 years at 4.75% would have a different total interest cost from the same balance over 30 years, even if the longer term feels easier month to month. If you enter a rate, deal or term, treat it as of June 2026; rates change frequently, verify current terms with an FCA-authorised lender or adviser before deciding.

The schedule can also help when comparing fixed-rate, tracker, discount and standard variable rate (SVR) outcomes. MoneyHelper notes that mortgage rates can be fixed or variable, and that the type of rate affects what you pay (MoneyHelper, 2026).

How rate changes affect the numbers

Many UK mortgages begin with an initial deal period, such as a two-year or five-year fixed rate. After that, the mortgage may move to the lender’s SVR unless you remortgage or complete a product transfer.

Read also: Why a Bank of England Rate Cut May Not Move Mortgage Interest Rates in the UK

The Bank of England says Bank Rate affects other interest rates in the economy, and as of June 2026 the current Bank Rate shown on its page was 3.75% (Bank of England, 2026). That does not mean your mortgage rate will match Bank Rate. Lenders price products using their own funding costs, margins, risk appetite, loan-to-value (LTV), fees, and product type.

An amortisation schedule is therefore an estimate, not a promise. If your rate changes, your monthly payment, interest share, and balance path can all change.

What to enter for a clearer result

Use your current mortgage balance, remaining term, interest rate, repayment type, and payment frequency. If you want to test overpayments, enter the regular or one-off amount and check whether your lender allows it without an early repayment charge.

If you are comparing a remortgage, include product fees, valuation fees, legal costs and any early repayment charge where possible. Which? provides mortgage and property guidance for comparing mortgage options and costs (Which?, 2026).

The most useful output is not just the first monthly payment. Look at the balance after the fixed-rate period, total interest over the full term, and the point at which overpayments start making a visible difference.

Important limits

A calculator cannot know every lender rule. Some lenders calculate interest daily, while others may use different timing rules. Completion dates, fee treatment, payment dates, future rate changes and product transfers can all alter the real figures.

This information is general educational information, not regulated mortgage advice, and not personalised financial, lending, tax or legal advice. Refisage is not authorised by the Financial Conduct Authority (FCA). Eligibility, fees and availability vary by lender, product and personal circumstances, and rules can differ across England, Scotland, Wales and Northern Ireland. Consider speaking to an FCA-authorised mortgage adviser, MoneyHelper, or a qualified tax professional before making a mortgage decision. Your home may be repossessed if you do not keep up repayments on your mortgage.