Looking At Mortgage Rate Volatility in 2026: Why Fixed Rates Are Edging Up Again
At the start of 2026, the mortgage market was on a trajectory that borrowers had been waiting years to see. The Bank of England had cut base rate from its 2023 peak of 5.25% down to 3.75% through a series of reductions across 2024 and 2025. Fixed mortgage rates had responded: best-buy five-year fixes had returned to the low 4% range, some products were nudging below 4% for borrowers with larger deposits, and market expectations — priced into swap rates — were pointing toward further cuts through 2026 that could bring fixed rates below 3.5% by year-end.
That trajectory has been interrupted. The conflict involving Iran that escalated in early 2026 has pushed oil and gas prices sharply higher, raised inflation expectations significantly, and caused financial markets to fundamentally revise their projections for the Bank of England’s rate path. Where two or three further cuts were expected through 2026, markets are now broadly pricing in the base rate remaining at 3.75% for the remainder of the year — with some analysts raising the possibility of rate rises if energy-driven inflation proves persistent. This adds to the question of is it better to rent or buy, currently.
The practical consequence: fixed mortgage rates that were falling are now rising. Average five-year fixed rates have moved from below or around 4% earlier in the year to above 5.5% across the full market. A typical mortgage taken out now is approximately £85 per month more expensive than it was before the international situation escalated. The reversal, while sharp, is being experienced differently by different groups of borrowers — and understanding the mechanism behind it helps borrowers make better decisions about what to do next.
How Fixed Mortgage Rates Are Set: The Swap Rate Mechanism
The most important thing to understand about the current rate environment is that fixed mortgage rates are not set by reference to the Bank of England’s base rate. They are set by reference to swap rates — the rates at which banks borrow money from each other for fixed periods in the wholesale money markets.
Swap rates reflect market expectations of future interest rates over the duration of the swap. A two-year swap rate represents the market’s collective view of what the average interest rate will be over the next two years. A five-year swap rate represents the five-year expectation. When the market expects the Bank of England to cut rates, swap rates fall ahead of the actual cuts — which is why fixed mortgage rates sometimes fall before the Bank of England moves, and why they sometimes rise even when the base rate is unchanged.
The current situation illustrates this mechanism clearly. The Bank of England held base rate at 3.75% at its March 2026 meeting. But swap rates — which had fallen on expectations of future cuts — rose sharply as markets repriced the inflation risk from rising oil and gas prices. When swap rates rise, lenders’ funding costs for fixed-rate products increase, and those costs are passed on in the pricing of new fixed-rate deals. The result is that fixed mortgage rates rise even though the base rate has not moved.
This explains the apparent paradox that many borrowers find confusing: “the Bank of England hasn’t raised rates, so why is my mortgage going up?” The answer is that fixed mortgage rates were already pricing in a rate-cut scenario that is no longer expected to materialise. They are repricing from a future that has been revised. Property experts Savills have a great insight here and the official government data supports this.
The Inflation Mechanism: Why Oil Prices Drive Mortgage Rates
The link between oil prices and mortgage rates operates through inflation expectations. When oil and gas prices rise sharply:
Energy costs feed directly into CPI. Higher petrol prices, higher domestic gas bills, and higher electricity costs (which has significant gas-fired generation in the UK mix) all feed directly into the Consumer Prices Index, which is the Bank of England’s target measure. Even if the Bank holds base rate steady in the short term, the expectation that higher energy costs will push CPI above target changes the probability distribution of future base rate decisions — reducing the probability of cuts and increasing the probability of holds or rises.
Supply chain and production costs follow energy prices. Manufacturing and logistics costs move with energy prices, which feed through into the prices of goods and services across the economy more broadly — the so-called “second-round effects” that the Bank of England monitors closely.
Market expectations shift before the Bank acts. Financial markets price in probabilities rather than certainties. When a geopolitical event shifts the balance of probabilities toward higher inflation and fewer rate cuts, swap rates reprice almost immediately — while the Bank’s actual policy decisions follow weeks or months later, after economic data confirms or challenges the market’s assessment.
The speed of this transmission is one of the most disorienting aspects of the current environment. Mortgage rates can move significantly within days of a geopolitical event, based on market repricing of future rate expectations, while borrowers are still processing whether the event is significant or temporary.
What Has Changed Since January 2026
At the start of the year, the rate environment looked like this:
- Bank of England base rate: 3.75% (having been cut from 5.25% at the 2023 peak)
- Best-buy five-year fixed rates: approximately 3.75%–4.25% for lower LTV borrowers
- Best-buy two-year fixed rates: approximately 3.55%–4.33%
- Market expectation: two to three further base rate cuts in 2026, potentially bringing base rate to 3.25% by year-end
- Forward market pricing: fixed rates potentially reaching the low 3% range for best-buy products by end of 2026
In April 2026, following the escalation of international tensions:
- Bank of England base rate: 3.75% (unchanged, but held rather than cut)
- Average five-year fixed rate (full market): approximately 5.54%
- Average two-year fixed rate (full market): approximately 5.56%
- Best-buy five-year fixed rates (60% LTV): approximately 4.00%–4.35%
- Best-buy tracker rate: base + 0.60% = 4.35%
- Market expectation: base rate held at 3.75% through remainder of 2026; some probability of rises if energy inflation persists
- Some analysts previously predicting 3% fixed rates by year-end are now forecasting rates remaining at current levels or above through 2026
The gap between the January expectations and the April reality is significant — a typical borrower coming to the market now is paying materially more than they would have been offered three months ago.
The Standard Variable Rate Warning
Before addressing what borrowers should do, the SVR situation requires urgent emphasis. Major lenders’ Standard Variable Rates are currently running at approximately 7%–8%. The difference between the best available fixed rate (approximately 4.0%–4.35% for competitive LTV brackets) and the SVR is 3–4 percentage points — a difference that translates to approximately £200–£400 per month on a £200,000 mortgage.
Any borrower who has allowed their fixed-rate deal to expire without arranging a new product is sitting on the SVR and paying this premium every month. In the current rate environment — where rates have risen from where they were earlier in the year — the cost of passivity is particularly high. Every month on the SVR is a direct financial loss relative to any available fixed or tracker deal.
If you are currently on an SVR, or if your fixed deal is expiring within the next three to six months, the single most important mortgage decision is to engage a whole-of-market mortgage broker immediately.
Two-Year vs Five-Year Fixed: The Decision Has Changed
The two-year vs five-year fixed decision that was relatively clear in January 2026 has become more complex in the current environment.
In January 2026, the case for a two-year fix was strong: two-year rates were slightly cheaper than five-year rates (an inverted yield curve that typically signals near-term rate cuts), and the expectation of further Bank of England cuts meant that a borrower who fixed for two years would be positioned to remortgage at lower rates in 2028. The short fix looked like the better tactical choice.
In April 2026, that calculation has shifted substantially. Two-year rates and five-year rates have converged — both are running at approximately 5.5%+ on the full market average, and the spread at the best-buy level is also narrower than it was. The expectation of rates being materially lower in 2028 has reduced. A borrower who fixes for two years now is accepting current elevated rates with the hope that 2028 rates will be lower — but that expectation is now considerably less certain than it was in January.
The case for a five-year fix has strengthened in this environment. Certainty for five years locks in a known payment regardless of whether the current geopolitical situation worsens, whether energy inflation proves persistent, or whether the Bank of England reverses direction and raises rates. The cost of that certainty — slightly higher monthly payments than the current best tracker, for example — may be worth paying.
The decision depends on individual circumstances, particularly: how exposed the borrower is to the risk of rates rising further (the larger the mortgage, the more material this risk); how stable the borrower’s income and personal circumstances are over a five-year horizon; and the borrower’s overall financial resilience to absorb payment increases if they choose a shorter fix and rates do not fall as hoped.
Trackers in the Current Environment
A tracker mortgage at base + 0.60% (currently 4.35%) is priced competitively with or below best-buy five-year fixes for lower LTV borrowers. This means the argument for choosing a tracker — accepting exposure to rate movements in exchange for current savings versus a fixed rate — is less financially compelling than it was when trackers were materially cheaper than fixes.
However, penalty-free trackers have a specific advantage: if rates do eventually fall — whether because the current inflationary pressures ease or because the Bank of England manages to cut despite current headwinds — a tracker immediately passes the reduction through to the borrower. A fixed-rate borrower cannot benefit from rate falls without paying an early repayment charge.
For borrowers who genuinely believe that rates will fall significantly in the next 12–24 months — and who are comfortable accepting the risk that they may not — a penalty-free tracker is a reasonable choice. For borrowers who prioritise certainty, or who are concerned about the risk of rates rising further from current levels, a fixed rate provides the protection they need.
What Should Borrowers Do Now?
The rate environment is uncertain in a way that makes precise recommendations less useful than a clear framework for decision-making.
If your fixed deal is expiring soon: Act immediately. Lock in a rate as early as your lender allows — most will allow you to reserve a new product up to six months before your current deal expires. If rates fall between now and your deal expiry, you may be able to switch to a better product before completion without penalty (depending on the product terms). If rates rise further, you are protected by the rate you have locked in.
Do not wait for a clearer picture. The current uncertainty is the environment in which waiting is most risky — rates can and have moved significantly within days.
If you are buying for the first time or moving: Budget for the current rate environment rather than the January projections. A mortgage that works at 4.5% may not work at 4.0% if you had budgeted on the earlier expectation — recalculate your affordability on current offered rates, not on what you expected rates to be three months ago.
If you are on an SVR: The most urgent action available. An SVR at 7–8% in the current environment is a significantly worse outcome than virtually any available fixed or tracker deal. Engage a whole-of-market mortgage broker today.
If you are mid-way through a fixed deal: In most cases, you are protected from the current volatility. Your payment is fixed for the remainder of your term. Begin monitoring rates approximately six months before your deal expires and engage a broker before the expiry date.
If you are considering overpayment: If you have savings earning less than your mortgage interest rate, using those savings to overpay your mortgage — reducing the outstanding balance before your next remortgage — improves your LTV bracket and therefore the rates available to you. In the current environment, where lower LTV brackets (60%, 75%) attract meaningfully better rates than higher LTV brackets, this calculation matters.
The Longer-Term View
The current rate volatility is a disruption to a trend — the gradual reduction of mortgage rates from 2023 peak levels — that has not been reversed. The Bank of England’s rate-cutting cycle, which began in 2024, is paused rather than over. If the international situation stabilises, oil and gas prices moderate, and inflation expectations return to a downward trajectory, the expectation of further base rate cuts can reassert itself, swap rates can fall, and fixed mortgage rates can resume their declining path.
Several major UK forecasters who were projecting fixed rates below 3.5% by end of 2026 have revised their projections to account for the current environment but have not abandoned the longer-term direction. The question is one of timing rather than ultimate destination: rates are expected to be lower in 2027–2028 than they are today, but the path there is less smooth and less certain than it appeared in January.
For the mortgage market, 2026 is a year that is teaching borrowers a lesson that the post-2008 low-rate era had allowed many to forget: interest rates can move quickly and in unexpected directions, and the appropriate response to this reality is to manage mortgage exposure with the same attention and discipline that financial markets apply to rate risk at an institutional level.
The borrowers who are managing this environment best are those who acted on the rate environment as it was — securing good fixed rates when they were available — rather than those who were waiting for the perfect moment that never quite arrived.
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