This market intelligence piece was published on 29th June 2026, reflecting data and events as of mid-June 2026. Swap rate data sourced from Chatham Financial. This communication is for professional clients only and does not constitute financial advice. Forecasts represent P10's current view and are subject to change. Past performance is not a guide to future results.
INTRODUCTION
The announcement of a ceasefire between Iran and the United States shifted the global risk landscape materially - and the Iran US ceasefire UK economy impact has already been felt across swap markets, gilt yields and lender pricing. The Iran US ceasefire UK economy represents one of the most significant macro shifts for UK borrowers, investors and developers in 2026. The caveat worth stating upfront, though, is that the ceasefire is a 60-day memorandum of understanding rather than a permanent settlement, and the situation on the ground remains fragile. Both sides have already violated its terms, Iran struck a vessel in the Strait of Hormuz after the signing, and oil flows have not fully normalised. Our assessment below is predicated on the ceasefire broadly holding. If it doesn't, the picture changes quickly. With that in mind, here is P10's read on the knock-on effects for SONIA swap rates 2026, fixed-rate lending, property markets, inflation and the Bank of England's path on base rate.
SONIA SWAP RATES 2026 - IN SHARP RETREAT
The Iran US ceasefire UK economy repricing has been immediate and significant across the SONIA swap curve. Energy risk premiums have collapsed, gilt yields have softened and rate expectations have shifted materially over just four trading sessions.
| Tenor | 13 Jun | 16 Jun | Change |
|---|---|---|---|
| 1 Year SONIA | 4.41% | 4.28% | ▼ −13 bps |
| 2 Year SONIA | 4.18% | 4.02% | ▼ −16 bps |
| 3 Year SONIA | 4.09% | 3.91% | ▼ −18 bps |
| 5 Year SONIA | 4.05% | 3.84% | ▼ −21 bps |
| 10 Year SONIA | 4.12% | 3.90% | ▼ −22 bps |
Source: Chatham Financial. Rates have continued to move since 16th June. Confirm live pricing before transacting.
We expect the move to continue if the ceasefire holds. With energy risk premiums still partially embedded in longer-dated swaps, there is further to go - particularly at the 5 and 10 year end. This will translate swiftly into lender repricing on fixed-rate products across both residential and commercial books, with the UK fixed rate mortgage outlook improving materially as a result.
P10 view: Fixed interest rates should go into freefall over the coming weeks if the ceasefire holds and energy prices stay suppressed. The swap rate moves we've seen so far are the beginning, not the end - but they are contingent on the geopolitical situation remaining stable.
IRAN US CEASEFIRE UK PROPERTY MARKET - A SIX-MONTH LAG BEFORE MARKETS ACCELERATE
The Iran US ceasefire UK property market impact will not be immediate. Rate reductions do not instantly translate into transaction volume. Buyers, sellers, valuers and surveyors all need time to reprice expectations. Our base case is a six-month lag, placing the acceleration of activity in Q4 2026 and into Q1 2027 — again, assuming the ceasefire broadly holds.
Now - Q3 2026
Swap rates fall and lenders reprice fixed products. Buyer sentiment improves but transaction volumes remain muted. Developers and investors begin dusting off shelved schemes. Commercial property finance conversations are already picking up as borrowers assess their options ahead of the rate repricing.
Q4 2026
Mortgage approvals pick up. Commercial investors return to the market with confidence. Refinancings accelerate as existing borrowers capture lower rates. Residential completions begin rising. Commercial property yield compression is expected to accelerate as capital returns to prime assets.
Q1 - Q2 2027
Both residential and commercial markets in full upswing. New development finance enquiries surge. Pricing pressure returns to prime assets. Bridging demand expected to peak as developers move fast on distressed stock.
INFLATION - TWO FLAT MONTHS, A SPIKE STILL POSSIBLE, BUT THE TREND IS ENCOURAGING
The headline most people missed: CPI held at 2.8% for both April and May - two consecutive months below market expectations, when a bounce back to 3% or above was widely predicted. That's the key data point. It suggests the underlying inflation picture is more benign than the conflict-driven energy spike narrative implied.
Services inflation did jump to 3.7% in May from 3.2% in April - the measure the MPC watches most closely - and that's the number to watch in the July data. It partly reflects the Easter timing effect on airfares rather than a structural shift, but the MPC will want to see it ease before moving on rates.
The honest caveat is that energy costs from the conflict period are still feeding through to CPI with the usual 4–8 week lag - so a spike in June and July data remains possible. But if inflation holds at or near 2.8% for a third consecutive month, the case for a rate cut becomes considerably harder for the MPC to resist. Two flat months below forecast is not a blip. A third would be a trend.
P10 view: The inflation picture is more encouraging than the market expected. A temporary spike in June-July data is still possible due to energy cost lag, but if the ceasefire holds and energy prices stay suppressed, the trajectory by year end points firmly downward — which directly supports our base rate call below.
UK BASE RATE FORECAST 2026 - THE BANK OF ENGLAND'S HAND MAY YET BE FORCED
Understanding the Iran US ceasefire UK economy impact on rates requires looking beyond the headline hold. The UK base rate forecast 2026 from markets currently points to a hold at 3.75% through December. We believe there could still be a cut - and the inflation data is beginning to support that view more than it was a month ago.
Labour market: Softening - government policy headwinds on hiring, with employers absorbing higher NIC costs and AI implementation causing real issues for the wider economy.
Inflation path: Two consecutive months at 2.8%, below forecast both times. If June follows the same trend, the Q3 spike narrative weakens considerably and the MPC's case for holding gets harder to justify.
Energy prices: Suppressed for now - but the ceasefire is fragile. The Strait of Hormuz has partially reopened but oil flows haven't fully normalised, and experts warn prices may not reach pre-war levels in 2026. The conflict premium hasn't fully unwound - it's just reduced.
P10 base rate call: 3.50% by end of 2026.
The MPC voted 7–2 to hold at the June meeting, with two members voting for an increase to 4% — a tighter split than April's 8–1, and a reminder that not everyone on the committee is reading the same data the same way. Market consensus for the UK base rate forecast 2026 now spans 3.50% to 4.25%. We retain our 3.50% base case, but we hold it with more confidence than a month ago given the inflation data - provided the ceasefire holds and the energy spike doesn't materialise at the scale previously feared. The next MPC decision is 30 July 2026.
WHAT THE IRAN US CEASEFIRE UK ECONOMY SHIFT MEANS FOR BORROWERS
The UK fixed rate mortgage outlook has improved considerably, and if the inflation trend of the last two months continues, the rate environment could move faster than the market is currently pricing. If you are coming off a fixed deal in the next six months or on a variable rate, the Iran US ceasefire UK economy impact on rates makes acting sooner rather than later the stronger move. Lenders will reprice quickly once the SONIA swap rates 2026 moves feed through fully — and the borrowers who move early tend to do better than the ones who wait for certainty that never quite arrives.
For investors and developers active in commercial property finance, the Q4 2026 acceleration timeline is the planning horizon that matters. The deals being structured now are the ones that will be best positioned to move when transaction volumes return. For those tracking commercial property yield compression, the conditions that drive that compression - falling rates, returning capital, improving sentiment - are beginning to align, even if the geopolitical uncertainty means the pace is harder to predict than it would otherwise be.
If you are active in the UK living sector and want to understand what the rate environment means for deal structuring and development finance, the same logic applies - the window to act ahead of the market is now.
If you want to talk through what the Iran US ceasefire UK economy shift means for a live deal or an upcoming refinance, get in touch with the team.
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