Analysis: Iran War Sparks Stagflation Fears as Energy Costs Surge and UK Growth Stalls

The UK economy entered March 2026 under a cloud of uncertainty that few forecasters anticipated even six months ago. The escalating conflict with Iran has sent energy markets into turmoil, pushing oil and gas prices sharply higher at a time when the domestic economy was already showing signs of strain.

For households and businesses alike, the timing could hardly be worse. Inflation, which the Bank of England had been gradually wrestling back towards its 2% target, is now expected to tick higher — potentially significantly so — as energy costs feed through the supply chain. Meanwhile, GDP growth has slowed to a crawl, unemployment has risen to around 5.2%, and the Chancellor's Spring Statement on 3 March offered little in the way of fiscal stimulus.

The dreaded word on economists' lips is stagflation — the toxic combination of stagnant growth and persistent inflation that is notoriously difficult for policymakers to address. The last time the UK faced a genuine stagflation episode was in the 1970s, also triggered in large part by an energy crisis in the Middle East. History, it seems, has an uncomfortable habit of rhyming.

The most immediate transmission mechanism from the Iran conflict to UK household budgets is energy. Brent crude oil prices have surged past $95 per barrel in recent weeks, up from around $75 at the start of the year, as markets price in the risk of prolonged disruption to Middle Eastern supply routes.

The impact is already being felt across the economy. BBC News reported that UK energy firms have begun pulling fixed-rate deals as wholesale costs become too volatile to price with confidence. For the millions of households whose fixed tariffs are due to expire in the coming months, this is deeply concerning — they may find themselves forced onto variable rates that track wholesale prices upward.

Rural residents who rely on heating oil are particularly exposed. Heating oil prices have jumped by over 25% since January, adding hundreds of pounds to annual bills for homes not connected to the mains gas grid. Meanwhile, a surge in jet fuel costs is expected to push up air fares, hitting holiday budgets just as families begin booking summer travel.

Ofgem's energy price cap, which is reviewed quarterly, will almost certainly rise in the July adjustment. Analysts at Cornwall Insight suggest the cap could increase by 15-20% if current wholesale prices persist, potentially pushing the typical annual dual-fuel bill back above £1,800 — a level not seen since the aftermath of the 2022 energy crisis.

For context, the current price cap stands at around £1,568 for a typical household. A return to £1,800+ would wipe out much of the progress made over the past two years in bringing bills down from their crisis peak of over £2,500.

UK CPI inflation has been hovering around 3% in recent months — already above the Bank of England's 2% target — and the energy price surge threatens to push it meaningfully higher. The Office for National Statistics will publish the next inflation reading later this month, and economists are bracing for a figure closer to 3.5%.

Energy is far from the only inflationary pressure. Food prices remain elevated, partly due to supply chain disruptions linked to the broader geopolitical instability. Transport costs are rising on the back of higher fuel prices. And services inflation — driven by wage growth in a still-tight labour market for skilled workers — has proved stubbornly persistent.

The problem for the Bank of England is acute. In a normal environment, rising inflation would call for higher interest rates. But with growth slowing and unemployment rising, tightening monetary policy risks tipping the economy into recession. Conversely, cutting rates to support growth could allow inflation to become entrenched.

The Monetary Policy Committee held the base rate at 3.75% at its last meeting, and markets now expect rates to remain on hold for longer than previously anticipated. The rate cuts that many mortgage holders had been banking on may be delayed well into the second half of 2026, if they come at all.

This is the essence of the stagflation trap: every policy lever that addresses one problem worsens the other. The BoE is caught between a rock and a hard place, and households are paying the price.

Beneath the headline economic data, the UK labour market is showing increasing signs of strain. Unemployment has risen to approximately 5.2%, up from the post-pandemic lows of around 3.5% seen in 2022-23. While this remains below the long-term historical average, the direction of travel is concerning.

Job vacancies have been falling for over a year, and redundancy notifications have picked up in sectors exposed to higher energy costs — particularly manufacturing, logistics, and hospitality. The ONS employment data suggests that much of the recent jobs growth has been concentrated in lower-paid, part-time roles, masking underlying weakness in the quality of employment.

For workers, the picture is mixed. Nominal wage growth remains around 5-6%, which sounds healthy in isolation. But once inflation is stripped out, real wage growth has slowed to barely 2% — and if inflation rises further on the back of energy costs, real incomes could stagnate or even fall.

The frozen tax thresholds compound the squeeze. With the Personal Allowance stuck at £12,570 and the Higher Rate threshold at £50,270 since 2021, fiscal drag continues to pull more workers into higher tax brackets. A worker earning £30,000 in 2021 who has received inflation-matching pay rises now earns around £36,000 — paying significantly more tax in real terms despite no improvement in living standards. HMRC's own data confirms that millions more taxpayers have been dragged into higher bands.

For those approaching retirement, the combination of market volatility and inflation uncertainty makes pension planning especially challenging. Defined contribution pot values have been buffeted by equity market swings, while annuity rates — though higher than a few years ago — may not keep pace if inflation surges.

The Chancellor's Spring Statement on 3 March arrived against this troubled backdrop, and the fiscal position offered little room for manoeuvre. The Office for Budget Responsibility revised down its growth forecasts and flagged the Iran conflict as a material risk to the public finances.

With borrowing already elevated and the government's fiscal rules under pressure, there was no scope for significant tax cuts or spending increases to cushion the blow. The frozen tax thresholds will remain in place, continuing to generate revenue through fiscal drag. No new energy support measures were announced, despite growing calls from consumer groups and opposition parties.

The Spring Statement did confirm some targeted support for businesses facing higher energy costs, including an extension of the Energy Intensive Industries discount scheme. But for ordinary households, the message was clear: the government expects the market and the Bank of England to manage the adjustment, with fiscal policy remaining tight.

This stands in stark contrast to the approach taken during the 2022 energy crisis, when the government introduced the Energy Price Guarantee and direct cost-of-living payments. The political calculus may change if energy prices continue to rise, but for now, households are largely on their own.

The GDP data tells its own story. Growth has decelerated in every quarter since Q1 2025, and the economy may have flatlined or contracted slightly in the first quarter of 2026. A technical recession — two consecutive quarters of negative growth — is now a realistic possibility if energy costs remain elevated through the spring and summer.

For UK households navigating this uncertain environment, there are several practical considerations.

Savings: With inflation potentially heading above 3.5%, the real return on cash savings is under pressure. The best easy-access savings accounts are currently offering around 4-4.5%, which still provides a modest real return — but only just. If you are holding significant cash, it is worth reviewing whether you are getting the best rate available. Our savings protection guide covers strategies for the current rate environment, and the savings hub has the latest comparisons.

Mortgages: The expectation of base rate cuts has been pushed back, which means fixed mortgage rates are unlikely to fall significantly in the near term. If your current deal is expiring, locking in now may still be preferable to waiting — rates could move in either direction given the uncertainty. Two-year fixes are currently around 4.2-4.5%, while five-year deals hover around 4.0-4.3%.

Energy bills: If you are on a fixed energy tariff that is due to expire, check whether any competitive deals remain available. With providers pulling fixed deals from the market, options may be limited. For those on variable rates, the July price cap increase will hit automatically. Consider energy efficiency improvements — loft insulation, draught-proofing, smart heating controls — which deliver savings regardless of where wholesale prices go.

Investments: Equity markets have been volatile, with the FTSE 100 swinging on daily developments in the Iran conflict. For long-term investors, the key principle remains: do not panic. Market timing is notoriously difficult, and selling into a downturn locks in losses. For those over 50 and building towards retirement, reviewing your asset allocation to ensure appropriate diversification is sensible.

Tax planning: With thresholds frozen, proactive tax planning is more valuable than ever. Maximise your ISA allowance (£20,000 for 2025-26 before the 5 April deadline), consider pension contributions for higher-rate tax relief, and review whether salary sacrifice arrangements could reduce your effective tax burden.

This article is for informational purposes only and does not constitute regulated financial advice. The value of investments can go down as well as up, and you may get back less than you invest. Tax rules and thresholds can change — always check the latest figures on GOV.UK before making financial decisions. For personalised advice, consult an FCA-regulated financial adviser via Unbiased or the MoneyHelper adviser directory.