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Offset Mortgage Calculator UK

Estimate how linked savings could reduce the mortgage balance charged interest.

This calculator is for illustration only and provides estimates for general information. It is not mortgage advice, a mortgage offer, a decision in principle or a guarantee of rates, fees, eligibility or savings.

Offset calculator

Balance charged interest
£—
Monthly interest reduction
£—

This is a simple interest estimate. It does not compare offset product rates, fees, tax treatment or lost savings interest.

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Email yourself a PDF summary of the figures currently shown on this calculator.

Calculator results are estimates only. Actual rates, fees, eligibility and products depend on your circumstances and lender criteria.

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How offset assumptions work

The calculator subtracts linked savings from the mortgage balance before estimating monthly interest. Product rules vary and some borrowers may prefer a lower standard mortgage rate or a different savings arrangement.

Your home may be repossessed if you do not keep up repayments on your mortgage.

Frequently asked questions

Does an offset mortgage reduce the mortgage balance? +
No. Savings are usually linked to reduce the balance charged interest. The mortgage balance remains due unless repayments reduce it.
Do I earn interest on offset savings? +
Offset savings commonly do not earn separate savings interest while they are offset. Tax treatment and product rules can vary.
Is an offset mortgage suitable for everyone? +
No. Suitability depends on savings level, rate, fees, access needs and wider circumstances. This page is not personalised advice.

Suggested next steps

Related calculators and guides

Offset Mortgage Calculator GuideUnderstand how an offset mortgage could affect interest estimates when savings are linked to a mortgage balance.Offset Mortgage CalculatorEstimate how linked savings could reduce interest charged on an offset mortgage balance.Fixed Rate Mortgage Calculator GuideEstimate monthly payments for a fixed-rate mortgage and compare the effect of term, balance and rate assumptions.

Calculator-led mortgage planning

UK Mortgage Calculators is centred on practical estimation tools. The pages help you model cautious scenarios before you decide whether to request a broker or adviser callback.