--- title: "Mortgage Overpayment Calculator UK 2026 — Interest & Years Saved | First Rung Now" description: "Free UK mortgage overpayment calculator (2026). See interest saved and years knocked off with lump-sum or monthly overpayments — free UK broker quote." lang: en-GB json-ld: | [ { "@context": "https://schema.org", "@type": "Organization", "name": "First Rung Now", "url": "https://firstrungnow.com", "description": "Independent UK mortgage education and broker matching service.", "address": { "@type": "PostalAddress", "addressCountry": "GB" } }, { "@context": "https://schema.org", "@type": "WebSite", "name": "First Rung Now", "url": "https://firstrungnow.com" }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "Can I overpay a UK fixed-rate mortgage?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — most UK lenders allow 10% of the balance per calendar year during a fix without triggering an early repayment charge (ERC). Over that, ERC of 1–5% typically applies." } }, { "@type": "Question", "name": "Is it better to overpay my UK mortgage or invest?", "acceptedAnswer": { "@type": "Answer", "text": "Rule of thumb: overpay if your mortgage rate is higher than your after-tax investment return. In a high-rate environment, overpaying is often the mathematically strongest risk-free option." } }, { "@type": "Question", "name": "Should I overpay my mortgage or my pension?", "acceptedAnswer": { "@type": "Answer", "text": "Pension wins for higher-rate taxpayers because of 40% relief; overpaying wins if you're basic-rate and the mortgage rate is above ~4%. Do both if you can." } }, { "@type": "Question", "name": "Does overpaying reduce my UK mortgage term or payment?", "acceptedAnswer": { "@type": "Answer", "text": "It reduces the term by default with most lenders (bigger interest saving). Ask to reduce the monthly payment instead if cashflow is tight — either is available on request." } }, { "@type": "Question", "name": "What's the early repayment charge on a UK mortgage?", "acceptedAnswer": { "@type": "Answer", "text": "Usually 1–5% of the balance repaid over the allowance, tapering by year (5% year 1, 4% year 2, etc.). It's set out on page 3 of your mortgage offer." } }, { "@type": "Question", "name": "Can I overpay a Help to Buy Equity Loan?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — you can partially staircase from year 1 in blocks of 10% (min £2,500). Each staircase needs a fresh RICS valuation and repays a % of current property value, not original loan." } }, { "@type": "Question", "name": "Do UK lenders let me set up regular monthly overpayments?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — nearly all offer standing-order monthly overpayments online with no fee. Lump sums usually go via bank transfer with a reference number." } } ] } ] --- [Skip to content](#main) [![First Rung Now](/assets/logo-mark-BqLOgqvj.png) First Rung Now UK Mortgage Guides ](/) - Mortgages - Remortgages - Buy To Let - Bad Credit - Calculators - Guides - [Find a Broker](/find-a-mortgage-broker) - [About](/about) [Speak to a Vetted Broker](/find-a-mortgage-broker) 1. [Home](/) 2. [Calculators](/calculators) 3. Overpayments Overpayments Calculators # Mortgage overpayment calculators Regular overpayments are the single most powerful way to cut lifetime mortgage cost. Model how much interest and time you'd save at your rate — before ERCs are triggered. ## Mortgage overpayment calculator Enter your figures, then add your name and phone to reveal the result. Free, no credit check. Loan balance (£) Interest rate (%) Term remaining (years) Monthly overpayment (£) Get your result & a free broker sense-check Add your name and phone (required) — we'll show your figures and optionally match you with a vetted FCA-regulated broker. No spam, no credit checks. Your name \* Phone number \* Email (optional) I'd like to be matched with a vetted broker for a free, no-obligation chat. Untick if you only want the calculation. Show my result By submitting you agree to our [Privacy Policy](/privacy-policy). ## More overpayments calculators ### Lump sum overpayment calculator One-off overpayment (e.g. bonus, inheritance) — impact on term and interest. [Ask a broker to run this](/find-a-mortgage-broker) ### Monthly overpayment calculator Same-amount, every-month view — the most common setup. [Ask a broker to run this](/find-a-mortgage-broker) ### Mortgage payoff calculator Total months to clear the balance under a chosen overpayment strategy. [Ask a broker to run this](/find-a-mortgage-broker) ### Time saved calculator How many months/years the overpayment removes from the term. [Ask a broker to run this](/find-a-mortgage-broker) ### Interest saved calculator Cash interest saved over the remaining term. [Ask a broker to run this](/find-a-mortgage-broker) Every scenario above depends on lender-specific criteria (income multiples, ICR, stress rates, credit profile). A vetted FCA-regulated broker will run the exact numbers for your situation in one working day. ## Frequently asked questions ### Can I overpay a UK fixed-rate mortgage? Yes — most UK lenders allow 10% of the balance per calendar year during a fix without triggering an early repayment charge (ERC). Over that, ERC of 1–5% typically applies. ### Is it better to overpay my UK mortgage or invest? Rule of thumb: overpay if your mortgage rate is higher than your after-tax investment return. In a high-rate environment, overpaying is often the mathematically strongest risk-free option. ### Should I overpay my mortgage or my pension? Pension wins for higher-rate taxpayers because of 40% relief; overpaying wins if you're basic-rate and the mortgage rate is above ~4%. Do both if you can. ### Does overpaying reduce my UK mortgage term or payment? It reduces the term by default with most lenders (bigger interest saving). Ask to reduce the monthly payment instead if cashflow is tight — either is available on request. ### What's the early repayment charge on a UK mortgage? Usually 1–5% of the balance repaid over the allowance, tapering by year (5% year 1, 4% year 2, etc.). It's set out on page 3 of your mortgage offer. ### Can I overpay a Help to Buy Equity Loan? Yes — you can partially staircase from year 1 in blocks of 10% (min £2,500). Each staircase needs a fresh RICS valuation and repays a % of current property value, not original loan. ### Do UK lenders let me set up regular monthly overpayments? Yes — nearly all offer standing-order monthly overpayments online with no fee. Lump sums usually go via bank transfer with a reference number. Why we ask for your details Calculators are educational. A free broker sense-check turns them into something actionable — specific to your credit profile, income type and lender criteria. ### Speak with a vetted broker Free introduction to an FCA-regulated adviser experienced in your scenario. 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