●GDP growth forecast cut to just 0.9% in 2026, recovering only modestly to 1.1% in 2027.
●CPI inflation forecast at 3.7% in 2026 — well above the Bank of England's 2% target — driven by soaring energy costs from the Middle East conflict.
●Unemployment expected to climb to 5.5% in 2026 as the labour market deteriorates, with vacancies already below pre-pandemic levels (ONS: 705,000 in Feb–Apr 2026).
●Gross government debt projected to reach approximately 105% of GDP by 2027. The fiscal deficit remains above 4% of GDP, placing the Chancellor's fiscal rules under serious strain.
●The OECD presents two scenarios: time-limited disruption (baseline) and prolonged disruption — in the latter, UK inflation could spike significantly higher and growth would weaken further.
●The OECD explicitly warns that thin fiscal buffers leave Britain ill-equipped to respond to further shocks.
0.9%
GDP Growth
2026 forecast
▲ Down from 1.3% in 2025 (ONS)
3.7%
CPI Inflation
2026 forecast
▲ Up from 3.4% in 2025 (OECD)
5.5%
Unemployment
2026 forecast
▲ Up from ~4.8% in 2025 (ONS)
~105%
Gross Debt
% of GDP, 2027
Data Visualisation
Sources: OECD Economic Outlook, Volume 2026 Issue 1: Under Pressure (3 Jun 2026) for forecasts. ONS GDP monthly estimate Dec 2025; ONS Blue Book 2025 for 2023 GDP outturn; ONS Employment in the UK latest bulletin; ONS Consumer Price Inflation Apr 2026 bulletin. Forecasts marked f.
Forecast Revisions — How the OECD View Has Shifted
Release
GDP Growth
CPI Inflation
Unemployment
Dec 2025
1.2%
2.5%
4.9%
Mar 2026
0.7%
4.0%
5.2%
Jun 2026 ← Latest
0.9%
3.7%
5.5%
Source: OECD Economic Outlook, Volume 2025 Issue 2 (Dec 2025); OECD Interim Economic Outlook (26 Mar 2026); OECD Economic Outlook, Volume 2026 Issue 1: Under Pressure (3 Jun 2026). Note: March 2026 Interim raised CPI forecast sharply from 2.5% to 4.0% following Middle East energy shock; June 2026 revised GDP up slightly from 0.7% to 0.9% on stronger-than-expected Q1 2026 outturn.
Commentary
The OECD's June 2026 outlook lands with uncomfortable precision for a government that spent much of last year talking up green shoots. Britain's GDP forecast — sub-1% for 2026 — is weak in both absolute terms and relative to peers. The United States holds at 2.0%. Canada dips to 1.2% but recovers to 1.7% by 2027. The UK reaches only 1.1% — and that is the optimistic scenario. For context, ONS confirmed full-year 2025 GDP growth at 1.3%. The direction of travel is unmistakably downward.
The problem is structural, not cyclical. Britain entered the Middle East energy shock with fiscal buffers the OECD describes as "very thin." The deficit is still running above 4% of GDP. Debt has crossed 100% and is heading towards 105%. And the Chancellor's fiscal rules — already subjected to creative reinterpretation since the Autumn Budget — are formally under pressure again.
The OECD forecasts inflation at 3.7% for 2026 — the particular sting in the tail. The Bank of England finds itself, once again, watching growth slow while prices stay elevated. This is not the orthodox disinflationary slowdown that central bank models are designed to manage. It is an energy-driven stagflationary squeeze, the kind that corrodes real wages, undermines business investment, and destroys fiscal revenues all at the same time.
Unemployment rising to 5.5% is the human consequence of the same forces. Vacancies have fallen below pre-pandemic levels. Hiring has stalled. The tax burden on employment — ratcheted up in the Autumn Budget — is making labour more expensive precisely as demand for it softens.
GBTT Commentary
"What this OECD report confirms is something that the political class has been studiously avoiding: Britain is caught in a stagflationary trap of its own making. An energy price shock exposes every structural weakness at once — an unreformed planning system that blocked the cheap domestic supply we needed, a net zero framework that made us maximally dependent on imported gas, a welfare system so expanded it distorts the labour market, and a fiscal position so precarious there is nothing left in reserve when the shock arrives. You cannot tax-and-spend your way out of a productivity failure. You cannot borrow your way to energy security. The Chancellor's instinct has been to manage each crisis with another fiscal manoeuvre, but the OECD's numbers say clearly that the room for that has gone. What Britain needs — urgently — is cheaper energy, radical planning reform, and a serious supply-side agenda. Not another round of stealth taxation dressed up as stability."
— Damian Pudner, Director, Great British Think Tank (GBTT)
Why This Matters
Fiscal rules are breaking down
The Chancellor's self-imposed fiscal rules were already tissue-thin after the Spring Statement. With growth at 0.9% and borrowing still above 4% of GDP, they are now arithmetically unreachable without further tax rises or deeper spending cuts. The bond market will eventually price this.
The Bank of England: rates on hold, next move a cut — but not soon
Bank Rate has been held at 3.75% since February 2026. At the April MPC meeting the vote was 8–1 to hold — with one member already voting to raise to 4.0%, reflecting concern that the energy shock could embed inflation expectations. The BoE's own guidance is unambiguous: inflation will "probably rise further" in H2 2026. The next MPC decision is 18 June 2026. With the OECD now forecasting CPI at 3.7% for the full year, and services inflation still elevated, the case for a near-term cut has effectively collapsed. The direction of the next move remains a cut — but the timing has been pushed materially further out by the energy shock. Markets pricing any significant easing in 2026 are likely wrong. The MPC is caught between an inflation overshoot it cannot ignore and a growth slowdown it cannot fix with monetary policy alone. GBTT view: Bank Rate on hold for the foreseeable future. The next move is a cut — but not until the energy shock clears and inflation is convincingly back on a downward path. That is not a 2026 story.
Real household incomes remain under pressure
With CPI forecast at 3.7% for 2026 and wage growth decelerating as unemployment rises, real household incomes are set to be squeezed again. Consumption — already the weakest component of UK demand — is unlikely to provide rescue.
Business investment remains absent
Sub-1% GDP growth projections do not create the demand conditions needed for private capital expenditure. Britain's investment gap relative to peers is widening, and this Outlook does nothing to close it.
What This Means for the Economy
Britain is entering the back half of the 2020s with a structural deficit, an energy vulnerability, a labour market under stress, and a monetary framework incapable of responding cleanly to the combination of forces it faces. That is not a cyclical problem.
The OECD's "prolonged disruption" scenario — in which Middle East supply constraints persist into 2027 — would see inflation sharply higher and growth materially lower than even these already sober forecasts. Britain's energy import dependency means it is more exposed to this tail risk than Germany, France, or the United States.
The supply-side implication is direct and unavoidable. Any serious policy response must involve faster domestic energy development, planning liberalisation to reduce structural costs, and a credible multi-year fiscal path that bond markets can believe. What it cannot involve is more tax rises that depress supply further, or fiscal manoeuvres that paper over the structural gap without closing it.
Policy signal: cheaper energy, planning liberalisation, and supply-side tax reform matter more now than another round of fiscal illusion.
Next Release
SEP 2026
OECD Economic Outlook — Interim Report
Expected: September 2026 · GDP and inflation update for G20 countries. Watch for further UK downgrade given energy trajectory.
DEC 2026
OECD Economic Outlook — Volume 2026 Issue 2
Full country projections including updated 2027 scenario analysis. The prolonged disruption scenario will have crystallised or cleared by then.
The OECD's June 2026 outlook lands with uncomfortable precision for a government that spent much of last year talking up green shoots. Britain's GDP forecast — sub-1% for 2026 — is weak in both absolute terms and relative to peers. The United States holds at 2.0%. Canada dips to 1.2% but recovers to 1.7% by 2027. The UK reaches only 1.1% — and that is the optimistic scenario. For context, ONS confirmed full-year 2025 GDP growth at 1.3%. The direction of travel is unmistakably downward.
The problem is structural, not cyclical. Britain entered the Middle East energy shock with fiscal buffers the OECD describes as "very thin." The deficit is still running above 4% of GDP. Debt has crossed 100% and is heading towards 105%. And the Chancellor's fiscal rules — already subjected to creative reinterpretation since the Autumn Budget — are formally under pressure again.
The OECD forecasts inflation at 3.7% for 2026 — the particular sting in the tail. The Bank of England finds itself, once again, watching growth slow while prices stay elevated. This is not the orthodox disinflationary slowdown that central bank models are designed to manage. It is an energy-driven stagflationary squeeze, the kind that corrodes real wages, undermines business investment, and destroys fiscal revenues all at the same time.
Unemployment rising to 5.5% is the human consequence of the same forces. Vacancies have fallen below pre-pandemic levels. Hiring has stalled. The tax burden on employment — ratcheted up in the Autumn Budget — is making labour more expensive precisely as demand for it softens.