Remortgage at 4.79% Before You Drift Onto a 6.6% SVR — Waiting for the September MPC Is a 1-in-4 Bet You Cannot Afford to Lose

The Bank of England's official rate has been pinned at 3.75% since December, but that number stopped meaning much for borrowers long ago. What matters is the spread between the deal you can lock today and the rate you default onto if you do nothing.

The gap between the 4.79% two-year fix and the 6.6% SVR is 1.81 percentage points. On a £200,000 balance that is roughly £300 a month in interest — money handed to your lender for the privilege of waiting. Across a two-year fix, the difference between the two compounds to around £7,200, and that is before you factor in the fact that the SVR can rise further the moment the MPC does move. First-time buyers and anyone above 75% loan-to-value face a steeper version of the same maths at 5.49%.

None of this requires a September hike to bite. The SVR penalty applies the day your deal lapses, regardless of what the committee does on 17 September. The hike question only decides whether the fixed rate you eventually get is 4.79% or something worse. MoneyHelper's mortgage guide makes the same point without the drama: the SVR is almost always the most expensive way to hold a mortgage, and it is where borrowers end up by default rather than by choice.

Mortgage fixes do not wait for the MPC to vote. They are priced off gilt yields, and the 10-year gilt touched multi-decade highs this week before settling at 5.05%. When gilt yields move, lenders reprice fixed deals within days — and the direction of travel is up.

That repricing is already visible in the averages. Moneyfacts data shows the typical two-year fixed residential rate at 5.60% and the typical five-year at 5.63%. The best-buy 4.79% two-year deal sits a full 0.8 percentage points below the market average. Deals that far below the crowd do not wait for a second inflation print to get pulled — they get withdrawn the moment the lender has filled its funding at that price, which is exactly what happens when gilt yields jump.

The mechanics are worth understanding once, because they explain why waiting is not free. Lenders fund fixed-rate lending by borrowing against the gilt market, so the fix you are offered tomorrow is priced off tomorrow's — higher — yield. MoneyHelper's guide to rate options sets out how the two are linked. Our gilt yields explainer walks through the full chain from sovereign borrowing costs to your monthly payment.

The Office for National Statistics reported CPI at 2.9% in the year to July, up from 2.6% in June and the first rise in the annual rate since March. CPIH, the measure the Bank prefers, climbed to 3.1% from 2.8%.

The driver is energy, not a broad re-acceleration. Ofgem lifted the household price cap by 13% on 1 July, adding £221 a year to a typical bill, and gas prices rose at the sharpest pace since 2022. But the next leg is already scheduled: Cornwall Insight forecasts another 4% rise in October, lifting the typical bill to £1,729. The squeeze is not fading with the summer.

The Bank's central case, in its July Monetary Policy Report, has inflation at 3.2% by December, with a worst-case Middle East escalation pushing it to 4.5% by mid-2027. J.P. Morgan calls the July print a 'warning shot for what could come next'. You do not have to believe the worst case to see that the direction of travel has flipped. Our BoE rate-cycle explainer tracks the same data as it lands.

I am not claiming a September hike is likely. One in four is one in four. The point is the asymmetry.

If you wait and the MPC hikes, your fixed rate is repriced higher almost immediately — and a 0.25% move in Bank Rate routinely translates to a larger jump in the best-buy fixes, because lenders were already tightening around the edges as gilt yields climbed. If you wait and the MPC holds, you have gained nothing, because you could have locked the 4.79% deal today and kept it regardless of the outcome.

That is the part the 'hold is the base case' crowd keeps skipping. Acting now is free optionality. Most lenders let you secure a rate up to six months before your current deal ends, with no obligation to complete until you sign. You are not betting on a hike — you are removing the downside of one, at no cost. Our timing guide has the full six-month playbook, and our fixed vs variable guide covers what happens if you do nothing instead.

The cleverest-sounding objection to acting now is that a September hike is 'already priced in' — and that the five-year fix costing less than the two-year fix proves it. The inversion is real, but the conclusion is wrong.

A five-year fix at 4.61% is cheaper than a two-year fix at 4.79% because the market expects Bank Rate to be lower, on average, across the whole of the next five years — largely because of the cuts forecast for 2027. That says nothing about the next six weeks, which are precisely the period a remortgager whose deal expires now has to survive. The curve can be right about 2027 and still leave you repriced higher in September 2026.

And the 'priced in' logic cuts both ways. If a hike is genuinely priced in, then locking today costs you no premium over waiting — the deal already reflects the risk. In which case there is no penalty for acting now, only a penalty for drifting onto the SVR. Either way the rational move is the same: secure the rate. For the full counter-argument that the hike is overpriced, read the case for waiting — and notice it still does not tell you to sit on a 6.6% SVR while you think about it.

Three moves, in order.

First, find your deal's end date. If it is within six months, you are in the lock-in window now. Second, check your loan-to-value — the 4.79% best-buys are 75% LTV territory, so a rough valuation tells you whether you qualify. Third, compare a product transfer with a full remortgage: staying with your lender is faster and often fee-free, but switching can beat the retention rate. The full comparison is in our remortgaging guide, and MoneyHelper's fees and costs page runs through what a switch costs before you commit.

One carve-out: if you are mid-deal on a rate below 4%, stay put. Breaking a deal to chase 4.79% is daft, because an early repayment charge of 1-5% of the balance would eat the saving. This advice is for the millions whose fixes expire into the repriced 2026 market — and for anyone already on the SVR, where every day is costing you money. First-time buyers face the same logic, just at 90% LTV pricing, and the FCA's mortgages hub is worth a read before you sign anything. Start with our mortgages hub for the wider picture.