Remortgaging early — when exit can still win on paper

Remortgaging early means completing a new mortgage while your current deal period is still running — and, usually, while an early repayment charge (ERC) still applies. The headline rate on a new product can look better than the rate you have today. That gap is not the decision. The decision is whether the interest you would avoid, over a clear horizon, is still larger than the ERC plus switching fees after cashback.

This guide does not say you should leave early. It shows when early exit can still win on paper after those costs, and when the same EXAMPLE house shows that waiting until the charge falls away is cheaper. Figures come from our shared site EXAMPLE case. They are illustrative only. Your balance, rates, fees and ERC wording will differ.

Fix the ERC and fee stack first. Then compare paths. Our Early repayment charge estimator and Remortgage true cost calculator exist for that arithmetic. Neither tool is advice.

What “early” actually costs

On many UK fixed-rate (and some other) deals, redeeming the loan in full before the deal end date triggers an ERC. Common methods are a percentage of the balance redeemed, or a number of months of interest at the product rate. Schedules often step down. Some offers allow a free overpayment band before any charge applies. Exit or admin fees can sit on top. Read the offer and Key Facts Illustration — not a generic web summary.

Switching lender also brings product, valuation, legal and sometimes broker fees. Cashback can offset part of that stack. Adding fees to the new loan changes monthly payments and interest; paying them upfront changes cash today. Both need a line in the comparison.

Independent consumer guidance from MoneyHelper stresses checking costs — including early repayment charges — when you compare remortgage options with staying or transferring. The Financial Conduct Authority (FCA) publishes consumer material on mortgages and arranging a new deal so it can start when the existing one ends, which is the usual way to avoid paying an ERC by accident. Those pages explain process and protections. They are not a substitute for your own lender documents.

The EXAMPLE house (shared site case)

Hold these labelled EXAMPLE inputs constant through the worked paths below. Rates that are not live market prices are marked EXAMPLE.

• Outstanding balance: £185,000
• Remaining term: 22 years
• Current fixed rate: EXAMPLE 4.19%
• Months left on the deal: 4
• EXAMPLE ERC if you leave now at 2% of balance: £3,700
• New-lender rate if you remortgage: EXAMPLE 4.14%
• Fees to switch: £1,499 (EXAMPLE product fee £999 + legal £500)
• Cashback on the remortgage path: £250 (net fees £1,249)
• Comparison horizon: 24 months
• EXAMPLE standard variable rate (SVR) if nothing replaces the fix: 7.49% — illustration only, not your lender’s SVR

On a capital-and-interest repayment basis, holding balance and term constant for a simple comparison:

• Monthly at EXAMPLE 4.19%: about £1,074
• Monthly at EXAMPLE 4.14%: about £1,069
• Monthly at EXAMPLE 7.49% SVR: about £1,432

The new-lender payment is only about £5 a month lower than the current fix. Over 24 months that tiny gap cannot repay a £3,700 ERC. Early exit needs a different alternative path — or a much larger rate gap — before it can win on paper.

Path 1 — leave now versus stay on the current fix

Compare leaving today (pay the EXAMPLE ERC and net fees, then pay EXAMPLE 4.14% for 24 months) with staying on EXAMPLE 4.19% for the same 24 months and paying no ERC.

• Interest over 24 months at EXAMPLE 4.19% (stay): about £15,080
• Interest over 24 months at EXAMPLE 4.14% (leave): about £14,897
• Interest saving from leaving: about £183
• Upfront hit to leave: ERC £3,700 + net fees £1,249 = £4,949
• Net true cost of leaving versus staying: about £4,766 against early exit

On this path, early exit loses on paper. The rate gap is too small relative to the charge. Rough break-even on monthly repayment saving alone would need hundreds of months — far beyond a sensible planning horizon. Waiting until the ERC ends, then switching at the same EXAMPLE 4.14%, would avoid the £3,700 charge for only four months of delay on the current fix.

That is the usual arithmetic when only a few months remain and the available new rate is close to the rate you already have. Fees and ERCs decide; the headline gap does not.

Path 2 — when early exit can still win: leave now versus drift onto SVR

Early exit can still win on paper when the realistic alternative is not “stay on 4.19% for two calm years”, but “four months left on the fix, then a long stretch on a much higher reversion rate because no new product completes in time”.

Keep the same EXAMPLE house. Path A: leave now, pay the £3,700 ERC and £1,249 net fees, then run 24 months at EXAMPLE 4.14%. Path B: stay four months at EXAMPLE 4.19%, then 20 months on the labelled EXAMPLE SVR of 7.49%, with no switch fees in this simplified “do nothing” column.

• Path A total (24-month interest at 4.14% + ERC + net fees): about £19,846
• Path B total (4 months at 4.19% interest + 20 months at EXAMPLE 7.49% interest): about £25,106
• On these EXAMPLE figures, Path A wins by about £5,260 over 24 months

Important: 7.49% is an EXAMPLE SVR for illustration. It is not a live market rate and not your lender’s rate. Use the reversion rate in your own offer. Path B also assumes twenty months on that SVR — a planning stress case, not a prediction. Many households arrange a product transfer or remortgage so the new deal starts when the old one ends, which avoids that stretch. The point of the column is narrower: if the credible alternative really is a costly reversion period, the ERC can still be smaller than the interest you would otherwise pay.

Put your own ERC percentage, fees and rates through the true cost calculator before treating any gap as decisive.

Path 3 — larger rate gap, same house (mid-deal stress test)

A second way early exit can win on paper is a wide gap between a locked product rate and a much lower rate available now, with enough months left that the interest difference covers the charge. Still using the £185,000 / 22-year EXAMPLE house, imagine a labelled mid-deal stress test: locked EXAMPLE rate 5.89%, available remortgage EXAMPLE 4.14%, same 2% ERC (£3,700) and same net fees (£1,249), compared over 24 months.

• Monthly at EXAMPLE 5.89%: about £1,252
• Monthly at EXAMPLE 4.14%: about £1,069
• Monthly difference: about £183
• Interest over 24 months at 5.89% (stay): about £21,310
• Leave path total (24-month interest at 4.14% + ERC + net fees): about £19,846
• On these EXAMPLE figures, leaving wins by about £1,464 over 24 months
• Rough break-even on repayment saving alone: about 28 months to cover the £4,949 upfront hit

This stress test is not the shared site’s current-rate row; it is a labelled what-if on the same balance and term. It shows the shape of a win: the monthly saving has to be large enough, and the horizon long enough, that ERC plus fees are recovered. If the gap is small — as in Path 1 with 4.19% versus 4.14% — early exit loses. If the gap is wide — as here — early exit can win on paper even after the charge.

A simple checklist before you treat “early” as cheaper

• ERC method, percentage or months, step-down dates, and free overpayment band
• Exact deal end date and whether completion can land on or after that date
• Product, valuation, legal and broker fees; cashback and clawback conditions
• Whether fees are paid upfront or added to the new loan
• A written retention (product transfer) quote from the current lender
• A clear alternative path: stay on the current product, wait for ERC expiry, or risk time on SVR
• One comparison horizon (for example 24 months) applied to every path

Estimate the ERC in sterling with the ERC estimator, then fold fees and rate differences into the true cost view. If the net figure still favours waiting, the paper answer is wait — even if a comparison table shows a lower headline rate today.

Sources and further reading

We write in our own words. For independent consumer guidance, see MoneyHelper on remortgaging and the FCA’s consumer mortgages pages. Those sources explain process, costs to check, and consumer protections. They are not a substitute for reading your own lender offer.

Disclaimer

This guide and the worked EXAMPLE paths are illustrative only. They are not personalised financial advice. They are not a credit or mortgage offer. They are not an FCA-regulated recommendation. Check your lender offer (and Key Facts Illustration) for ERC, fees and product terms. Rates and charges change. If you want advice on your situation, speak to an FCA-authorised mortgage adviser.

Next steps

Run your redemption figures through the Early repayment charge estimator and the Remortgage true cost calculator. Compare leave-now against wait-for-ERC-end and against any realistic SVR window. Read retention quotes alongside new-lender figures. This site helps you organise the numbers; it does not tell you to leave early or to stay.