It's not either/or. If your fixed deal is ending in 2026, remortgage first — it's the bigger win by far. Then overpay on top. With 1.8 million fixed deals expiring this year and average fixes sitting near 6%, the right sequence is: remortgage away from your lender's standard variable rate, then chip at the balance with overpayments. Do it in that order and you'll squeeze both ends of the problem.
The 2026 remortgage wave is real
Here's the thing about 2026: it's a mortgage cliff edge. Around 1.8 million fixed-rate deals expire this year, following 1.6 million in 2025, according to UK Finance. Most of those deals were struck when rates were comically low — some borrowers have been paying under 1.4% for five years. Now they're waking up to a market where the average two-year fix is 5.98% and the five-year is 6.00% — the highest in roughly three years, per Moneyfacts data from early October 2026.
And here's the weird part: the Bank of England's base rate hasn't moved. It's been frozen at 3.75% since the September MPC meeting. Fixed rates have been climbing anyway, because lenders price off swap rates and gilt yields, not the base rate. Swap rates moved, inflation prints wobbled, and the sub-5% deals collapsed — from 1,494 available in early September to just nine by early October. If you were hoping to wait this out, that hope is getting expensive.
The Bank of England itself estimated that households rolling off sub-3% deals in 2026 face an average £170 a month increase in repayments. That's the average. Plenty of people are looking at much worse.
Let's run the numbers on a typical case
Take a £250,000 mortgage with 25 years left. Five years ago you fixed at 1.40%. Your monthly payment? About £988. Not bad at all.
That deal ends this autumn. The best you're likely to get now is around 6%. At 5.98%, that same £250,000 over 25 years costs roughly £1,610 a month. Your payment jumps by over £620 a month — that's £7,450 a year, gone, to interest.
Now here's where overpaying walks in. Say you overpay £200 a month on top of that new £1,610 payment. That £200 goes straight at the capital, and at 5.98% it works hard. Run the maths and the picture changes dramatically: total interest over the life of the mortgage drops from around £232,000 to roughly £175,000, and you clear the mortgage about five and a half years early. A £200-a-month habit buys back roughly £57,000 of interest. That's not pocket change — that's a deposit for your kid's first flat.
The point isn't that overpaying magically fixes the rate shock. It doesn't. The point is that once you're paying 6%, every extra pound you throw at the debt earns an effective, guaranteed, tax-free return of 6%. Show me a savings account that beats that right now. (The average easy-access rate is around 4.2%, for reference.)
The order matters: remortgage first to kill the biggest cost — your lender's standard variable rate, which can be 7% or more. Then overpay. Reversing the order means you overpay on a terrible rate while still bleeding interest.
Three situations, three answers
Honestly, the "remortgage or overpay" question has no single answer. It depends entirely on where you are in your deal. Here are the three cases that cover almost everyone:
Your deal ends within 6 months. Start shopping now. You can usually lock in a new deal 3 to 6 months before your current one expires, and most offers last that long — so if rates somehow drop before your switch date, you can often grab the cheaper one. Do not drift onto your lender's standard variable rate (SVR) "while you think about it". The SVR is where the lender stops competing and starts collecting. That £250,000 mortgage on a 7.5% SVR costs around £1,860 a month — over £250 more than a 5.98% fix. Every month you sit on the SVR is a month of overpaying interest for nothing.
You're mid-deal with spare cash. This is where overpaying shines. Check your annual overpayment allowance first — most fixed deals let you pay 10% of the outstanding balance per year with no early repayment charge (more on that in our 10% rule guide). A £250,000 mortgage gives you £25,000 a year of free headroom. Almost nobody has that much spare, which means almost everyone can overpay as aggressively as they like without ever hitting the limit.
You just remortgaged at ~6%. Welcome to the new normal. Your biggest lever now isn't another remortgage — it's the balance itself. Every overpayment reduces the capital that the 6% rate applies to. This is the year when overpaying moved from "nice financial hygiene" to "seriously high-return move", because the return equals your mortgage rate.
What about remortgaging early and paying the ERC?
Sometimes people ask: should I break my current deal early to remortgage, even with an early repayment charge? The maths is simple, even if the answer is usually no. Compare the total interest you'd save by switching against the ERC you'd pay to leave.
A £200,000 mortgage in year two of a five-year fix might face a 3% ERC — £6,000. Dropping from 6.5% to 5.98% saves you about £43 a month. Over the remaining three years of your deal, that's roughly £1,550. You'd pay £6,000 to save £1,550. No deal.
The exception: if you're on the SVR already, there are no ERCs to pay at all. Then remortgage immediately — yesterday, ideally. Our guide to what mortgage refinancing actually involves walks through the mechanics.
How the two moves stack up
| Remortgaging | Overpaying | |
|---|---|---|
| Best for | Deal ending soon, or stuck on SVR | Mid-deal, or post-remortgage with spare cash |
| Typical saving | £100–£300/month vs SVR | £1,000s–£10,000s of lifetime interest |
| Risk | Fees, valuation, affordability checks | Almost none (watch your allowance) |
| Effort | Paperwork, broker, a few weeks | One phone call or a few taps in your app |
| Timing | 3–6 months before deal ends | Anytime, best started immediately |
See the pattern? Remortgaging is the big structural fix; overpaying is the compounding habit. They don't compete — they combine. If you want to understand the mechanics of how each payment eats into the balance, our loan amortisation explainer shows exactly where your money goes each month.
The playbook for the next 90 days
- Check your deal end date today. Not "soon". Today. Dig out the mortgage offer or check your lender's app. Everything flows from this date.
- If it's within 6 months, get a broker or comparison running this week. 1.8 million people are doing the same thing, so give yourself a runway.
- Build a 3-month emergency fund first, then overpay with what's left. Overpaying with your only cash reserves is a trap — you can't easily get that money back if the boiler explodes.
- Set up a standing order for a monthly overpayment, even £50. Small and automatic beats large and occasional, every single time.
- Re-run the numbers when you remortgage. Your balance will be lower, your rate will be different — feed both into our calculator and reset your overpayment target.
And if you're weighing a new fix against a tracker while you're at it, our fixed vs variable rate guide covers the trade-offs in the current market.
Don't overpay what you can't afford to lose. Overpayments are hard to claw back — most lenders won't let you "borrow back" an overpayment. Keep your emergency buffer untouched and only overpay money you genuinely won't need for a few years.
See what overpaying does to YOUR mortgage
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Open the mortgage overpayment calculator →Quick answers
Should I remortgage or overpay first?
Remortgage first. Moving off your lender's standard variable rate onto a competitive fix saves far more than overpaying ever can. Once the new deal is in place, start overpaying — the two strategies stack.
Can I remortgage before my fixed deal ends?
Yes — most lenders let you agree a new deal 3 to 6 months before your current one expires, and the offer is usually valid until your switch date. This protects you if rates rise while you wait, and you can usually still take a better rate if one appears.
Is overpaying worth it at 6% interest rates?
More than ever. Every pound you overpay earns an effective, guaranteed, tax-free return equal to your mortgage rate. At 6%, that beats virtually any savings account — the average easy-access rate is around 4.2% before tax.
What if I can only overpay £50 a month?
Do it anyway. On a £200,000 mortgage at 6% over 25 years, £50 a month extra saves roughly £15,000 in interest and cuts the term by over a year. Small, automatic payments compound beautifully because they start reducing interest from day one.
Should I wait for rates to fall before remortgaging?
Don't bet on it. Markets currently price Bank Rate as more likely to rise than fall into 2027, and the November 2026 MPC decision is genuinely uncertain. Lock in a deal when your current one ends, choose a shorter fix if you want flexibility, and overpay in the meantime — that's the controllable part.
General information only, not financial advice. Mortgage rates, allowances and charges vary by lender and product. Figures are illustrative and rounded. Always check your own mortgage terms or speak to a qualified mortgage adviser before making decisions.