By the UKPropertyCalculator team • Published 27 September 2026
Most homeowners deal with their mortgage fix-end the same way they deal with their car insurance renewal — they leave it until the last minute, feel overwhelmed, pick something adequate rather than good, and spend the next few years paying more than they need to. The difference is that a bad car insurance renewal costs you fifty quid. A bad fix-end costs a homeowner with a £211,000 balance around £185 a month against the deal they could have had — every month, for five years. That is £11,000. Lenders know most people will be passive about it, and they price accordingly.
If you do absolutely nothing, your mortgage does not stop. It carries on. But from the day after your fixed-rate period ends, your lender automatically moves you onto their Standard Variable Rate (SVR). This is not a deal. It's the catch-all fallback rate your lender charges people who haven't bothered to switch, and it is almost always significantly higher than anything else on the market.
Your lender will usually send you a letter one to three months before your fix expires, informing you of the rate you'll move to. Most people file this letter in the "too stressful to deal with right now" pile and forget about it. That pile is expensive.
The SVR is a lender's own reference rate, and it sits a long way above the cost of money. In September 2026 the Bank of England base rate was 3.75%, while the average SVR was around 7.25% — a margin of about three and a half percentage points. Individual lenders sit either side of that average, and the spread across the market is wide enough that your own lender's SVR is worth looking up rather than assuming.
If you fixed at 1.9% in 2021 for five years — which a lot of people did, when base rate was 0.1% — rolling onto a 7.25% SVR in 2026 is close to quadrupling your interest rate. Compare that with the market you could be switching into instead: average fixes of roughly 5.7% over two years and 5.8% over five, with the sharpest 60% LTV remortgage deals just under 5%. The SVR is the most expensive rate on the board and the only one you get by doing nothing.
To be clear: the SVR isn't a penalty rate in a legal sense. You haven't done anything wrong. It's just that lenders price their SVR high because the segment of their customer base that rolls onto it tends not to shop around. They're relying on inertia, and for a lender, inertia is profitable.
Rachel bought a £280,000 house in 2021. She put down a 10% deposit (£28,000) and took a £252,000 repayment mortgage on a 5-year fixed rate at 1.9%, over a 25-year total term. Her monthly payment for those five years was approximately £1,060.
Now it's 2026 and her fix has ended. Her lender's SVR is 7.25% — the market average. With around £211,000 left on the mortgage and 20 years remaining, her monthly payment on SVR works out at approximately £1,670. That's £610 more per month — or £7,320 extra per year — compared to what she was paying.
Her balance is about 75% of what she paid in 2021, so unless the house has gained a fair bit she is not in 60% LTV territory and is looking at roughly market-average pricing. Say she remortgages onto a 5-year fix at 5.75%, the September 2026 average at 75% LTV: her payment comes down to approximately £1,480 per month. She is still paying more than her original fix — that part is unavoidable — but she is saving around £185 a month against the SVR default. Over five years that is roughly £11,200.
| Scenario | Rate | Monthly Payment | vs SVR |
|---|---|---|---|
| Original 5-year fix (2021–2026) | 1.9% | ~£1,060 | — |
| Roll onto SVR (do nothing) | 7.25% | ~£1,670 | baseline |
| New 5-year fix (75% LTV average) | 5.75% | ~£1,480 | –£185/month |
| New 2-year fix (75% LTV average) | 5.70% | ~£1,475 | –£190/month |
Figures are illustrative, based on a £211,000 balance over a remaining 20-year term, using September 2026 market rates: 7.25% average SVR, 5.70% and 5.75% average two- and five-year fixes at 75% LTV. Note how flat the two-year and five-year pricing is at the moment — for once, the certainty of a longer fix is costing almost nothing. If Rachel could get to 60% LTV she would be looking at closer to 4.9%. Use our Mortgage Calculator to model your own numbers.
This isn't really a choice so much as a default. Your mortgage continues on the SVR until you actively do something about it. The SVR is variable, so your payment can change month to month. The only circumstance where this makes sense is if you expect base rates to fall sharply in the near term and you want to avoid an ERC on a new deal — but even then, it's rarely worth it for more than a few months.
A product transfer means switching to a new mortgage deal with your existing lender. It's faster and cheaper than a full remortgage — there's no solicitor involved, no valuation fee in most cases, and you can often do it online in less than an hour. The downside is you're only comparing deals from one lender. Product transfers are worth checking first, then using as your baseline when comparing the wider market.
A full remortgage involves switching to a completely different lender. This gives you access to the whole market and is the route that most often produces the best rate — but it takes longer (typically 4–8 weeks), requires a solicitor, and usually involves a valuation. Some lenders offer free legals or cashback to offset these costs. A good mortgage broker can search the whole market and tell you within a few hours whether a product transfer or a full remortgage makes more financial sense for your situation.
Under the Mortgage Charter, signatory lenders let you lock in a new deal up to six months before your current fix ends, and you can still ask for a better like-for-like deal if rates improve before your new term starts. This is not a niche manoeuvre: the FCA logged 381,364 mortgages locked in ahead of maturity in the second quarter of 2026 alone. The six-month window before expiry is your prime shopping period.
In practice:
If your circumstances change mid-fix — you need to remortgage early because rates have dropped significantly, or you're selling and moving — you'll almost certainly face an Early Repayment Charge (ERC). Moneyfacts puts the usual range at 1% to 5% of the amount you owe, stepping down each year: 5% in year one of a five-year fix, perhaps 1% in the final year.
On a £200,000 balance, a 2% ERC is £4,000. That's real money. Whether it's worth paying depends on how much you'd save on a new deal multiplied by how many months are left — a broker can model this for you in minutes. The calculation is sometimes more favourable than it looks at first.
One exception: if you're porting your mortgage to a new property (taking your existing deal with you), most lenders waive the ERC provided the new loan is for a comparable amount. See our Total Cost of Buying guide for how porting fits into a broader move.
The Mortgage Charter, agreed in mid-2023 between the government and most major UK lenders, introduced a set of protections for borrowers facing payment strain at fix-end. If you're worried about the new payments, these are your key options under the Charter:
The catch: the interest-only and term-extension options apply to borrowers who are up to date with payments. Once you've missed payments you fall into the lender's general forbearance process instead, where the options are less generous and less predictable. Contact your lender proactively, before you're in difficulty. One more thing worth knowing: rolling onto the SVR does not trigger an ERC — you are out of your fixed deal, so there is nothing to break. The ERC risk runs the other way, when you leave a fix early.
This is the most common question. The honest answer is that nobody reliably knows where rates are heading, including the economists paid to forecast them. What you can control is certainty.
The case for fixing again is simple: it caps your payments for a defined period. If rates rise further, you're protected. If they fall, you'll miss out — but you'll know exactly what you're paying each month, which has a genuine value that doesn't show up in mortgage calculators.
The case for a tracker or discount rate is that you get the benefit of any base rate cut immediately, and there is normally no ERC, so you can move to a fix whenever you like. The risk is the reverse: most trackers have no cap on the upside. Borrowers who held trackers through 2021 to 2023 watched base rate climb from 0.1% to 5.25% and their payments follow it. Rates have come down since — base rate has been 3.75% since the summer — but three of the nine MPC members voted for a rise in September 2026, so a tracker is still a live bet, not a free option.
My general position: if you're budgeting tightly, fix. Certainty is underrated. If you have real financial resilience and genuinely believe rates will fall materially in the next 24 months, a short-term tracker can make sense — but go in with your eyes open. Use our Mortgage Calculator to model the monthly difference between rates before you decide.
One thing worth knowing: your existing lender doesn't have to offer you their best rate. When you go to your bank's website to do a product transfer, you'll see the rates they want to offer you. Those are often not the same as the deals a new-to-lender borrower would get from them — lenders know that switching inertia benefits them, so they price accordingly.
Always get a broker comparison before accepting your existing lender's product transfer rate. The comparison takes a few hours and costs nothing if you use a fee-free broker. The savings can easily run to £1,000–£2,000 a year.
Model your monthly payments before and after your fix ends.
Mortgage Calculator →You automatically move to your lender's Standard Variable Rate (SVR). You keep making monthly payments, but the rate — and therefore the amount — changes. The average SVR was around 7.25% in September 2026 while the average five-year fix sat near 5.75% and the sharpest 60% LTV deals were under 5%, so inaction usually means a significant payment increase.
Under the Mortgage Charter, lenders let you lock in a rate up to 6 months before your fix ends, with the offer held until completion — the FCA recorded 381,364 mortgages locked in this way in Q2 2026 alone. Starting 5–6 months out gives you time to shop around properly. Three months is the minimum I'd recommend — less than that and you're gambling on admin timelines.
Neither is automatically better — it depends on what the whole market is offering versus your existing lender's rate. Product transfers are faster and cheaper in fees; remortgages give you access to every lender. Compare both before deciding, ideally through a fee-free broker who can do the legwork.
Yes, but you'll almost certainly pay an Early Repayment Charge — typically 1–5% of your balance, falling over the course of the deal. The maths can still work in your favour if rates have dropped enough or you have very little of your fix remaining. Model it before you decide.
The Mortgage Charter (agreed in June 2023 between the government and lenders covering around 90% of the residential market) lets borrowers who are up to date switch to interest-only repayments for six months, or extend their mortgage term with the option to revert to the original term within six months — in both cases without a new affordability check and without affecting their credit score. If you're worried about making payments after your fix ends, contact your lender before you miss one.
Contact your lender early. Under the Mortgage Charter, lenders can extend your term or move you to interest-only for six months without an affordability check, provided you are up to date with payments. The worst thing you can do is say nothing — lenders have more flexibility for borrowers who engage proactively than for those who miss payments.
Yes. Lenders run affordability and credit checks when you remortgage to a new lender. If your credit has deteriorated since your original fix — due to missed payments, high utilisation, or new debt — your options may be more limited. A product transfer with your existing lender typically involves fewer checks and can be a fallback if the wider market isn't accessible.
Sources: Mortgage Charter (HM Treasury, June 2023); FCA Mortgage Charter uptake data (published 8 September 2026, Q2 2026 figures); Bank of England Bank Rate (3.75%, held 17 September 2026); average SVR and fixed-rate figures from Uswitch/Mojo and HomeOwners Alliance/Moneyfacts (September 2026); ERC ranges from Moneyfacts. Worked example figures are illustrative, derived from standard repayment mortgage arithmetic, and should be checked against current lender offerings before acting. This article is for information only — see our Disclaimer. Use our Mortgage Calculator for personalised figures.