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Partial mortgage repayment

Payment and interest after a lump-sum repayment

PARTIAL REPAYMENT

How much could a mortgage overpayment save?

1 · Current mortgage details

Enter the outstanding balance and either provide the remaining term directly or derive it from the start date.

Current outstanding balance£Use the balance on the latest lender statement or settlement figure, not the original loan amount.

Years remainingyears

Additional monthsmonths

2 · Rate applied today

For a variable rate, both the current index value and the lender margin are needed; the index name alone is not enough.

Current annual nominal rate%

3 · Principal overpayment

The lump sum is deducted from the balance before payment, interest and term are recalculated.

Partial repayment amount£

New outstanding balance£28,391.0051.38%

Calculation resultUpdates instantly

estimated interest avoided with a lower payment£10,478.06

Result details

£364.75 → £177.35 payment · £187.40 monthly saving

Inside the result

Updates as you change the inputs

New monthly payment£177.35

Monthly saving£187.40

Annual rate used in the calculation3.5%

Calculated remaining term18 years

Two possible outcomes

Compare a lower payment with a shorter term using the same interest rate.

Lower the payment£177.35Keep the remaining term · Interest avoided: £10,478.06

Shorten the term7 years · 5 monthsKeep the current payment · Time saved: 10 years · 7 months · Interest avoided: £16,534.87

Mathematical estimate using a level-payment amortisation schedule. The outstanding balance shown by your lender is the most reliable starting figure. Fees or early-repayment charges, rounding, contract limits, rate floors or caps and local rules can change the result. Ask the lender for an up-to-date official calculation before paying.

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CALCUPOP · PARTIAL MORTGAGE REPAYMENT

Partial mortgage repayment

Completed summary using the values currently in the calculator

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01 · Calculation inputs

Complete the calculator or use the blank spaces below.

02 · Result and useful details

Result and useful details

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03 · Reminders, checks and notes

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DOES THE RESULT LOOK WRONG?

Help us improve this calculator.

HOW IT WORKS

A result to understand, not just read.

Compare two outcomes after a partial mortgage repayment: a lower monthly payment with the same remaining term, or the current payment with a shorter term.

OFFICIAL SOURCES

bancaditalia.it↗eur-lex.europa.eu↗

FREQUENTLY ASKED QUESTIONS

How does partial mortgage repayment work?+

The calculator rebuilds the current level payment from the outstanding balance, rate and remaining months, subtracts the lump sum, and recalculates both alternatives.

What should I check before relying on the result?+

Mortgage contracts, variable-rate changes, floors, caps, rounding, early-repayment rules and fees vary. Ask the lender for a dated official calculation before transferring money.

RESULT GUIDE

How to use partial mortgage repayment

Compare two outcomes after a partial mortgage repayment: a lower monthly payment with the same remaining term, or the current payment with a shorter term.

01 · FORMULA

Calculation method

C₁ = C₀ − V; A₁ = f(C₁, r, n)

The calculator rebuilds the current level payment from the outstanding balance, rate and remaining months, subtracts the lump sum, and recalculates both alternatives.

02 · WORKED EXAMPLE

Practical example

Enter the lender’s current balance, the remaining term or original start date and term, and today’s rate. For a variable rate, enter the current index value and lender margin.

The result separates payment reduction, time saved and interest avoided in each scenario.

Mortgage contracts, variable-rate changes, floors, caps, rounding, early-repayment rules and fees vary. Ask the lender for a dated official calculation before transferring money.

03 · HOW TO READ IT

How to interpret the result

Use the lender’s current balance rather than the original amount, test several lump sums, and keep an adequate emergency reserve.
Change one input at a time to understand which assumption has the greatest effect on the result.

04 · LIMITS

What the estimate does not include

Mortgage contracts, variable-rate changes, floors, caps, rounding, early-repayment rules and fees vary. Ask the lender for a dated official calculation before transferring money.
Use the result as a planning aid and confirm sensitive financial, health or animal-care decisions with the relevant document or qualified professional.