The Office for Budget Responsibility (OBR) has revised down its UK house price growth forecasts for 2026 and 2027, pointing to elevated mortgage rates and stagnating wage growth as the key constraints on the property market, according to Property Wire. The downgrade, published in the watchdog's latest economic outlook following the Autumn Budget, also includes a projected 4% fall in property transactions compared with the OBR's March forecast.
For international observers tracking the UK as a destination for property investment, the revision signals that affordability pressures from elevated mortgage rates and stagnant wages remain a constraint on the property market. The OBR's own language frames the forecasts as "highly sensitive" to further shifts in mortgage rates, real income growth, and planning policy — a reminder that even official projections carry meaningful uncertainty over a multi-year horizon.
What the OBR Actually Revised
According to Property Wire's report on the OBR outlook, average UK house price growth for 2026 has been revised to 2.1%, a reduction of 0.3 percentage points from the watchdog's March forecast. For 2027, the OBR now predicts growth of 2.5%, down 0.5 percentage points from its earlier estimate. Both figures represent a meaningful softening of the growth trajectory the OBR had pencilled in earlier this year, before the Autumn Budget cycle.
The OBR attributed the changes to a combination of "lower-than-expected in-year receipts for both residential and commercial sectors and reductions to the forecasts for house prices and property transactions," as quoted in the report. That phrasing indicates the downgrade is not a single-factor story — it reflects weaker-than-anticipated activity across both sides of the market feeding back into the price outlook.
Transaction Volumes and the Stamp Duty Shortfall
Property transactions are forecast to rise from approximately 1.2 million in 2026 to 1.3 million by 2031, but this trajectory is 4% lower than the OBR's March projection, with higher mortgage rates cited as the main dampening factor. The practical consequence shows up most clearly in tax receipts: property transaction taxes are now forecast to generate £17 billion in 2026-27, a 0.6% decline versus 2025-26.
Relative to the March forecast, the OBR expects stamp duty receipts to come in £3.2 billion lower in 2026-27, with an average shortfall of £3.9 billion annually over the remainder of the forecast period. These are Exchequer revenue figures rather than property price data, but they are a useful proxy for transaction momentum — fewer completed purchases at lower average growth rates translate directly into weaker tax intake, which in turn can constrain government flexibility on future housing-related policy.
Figures as reported by Property Wire citing the OBR's Autumn Budget economic outlook, checked 2026-10-29. Previous-forecast figures for 2026/2027 house price growth are derived from the stated percentage-point reductions (2.1%+0.3=2.4%; 2.5%+0.5=3.0%); the implied prior stamp duty figure is derived from the stated £3.2 billion gap.
Rental Market: A Separate Tax Pressure Point
The OBR's report also examined a planned additional two percentage points on income tax for rental income, warning this could add upward pressure on rents. The watchdog's analysis suggests potential landlords may be deterred from entering the market, reducing long-term rental supply. As the report states, "Landlords are likely to pass on more of these costs to renters in the long-run through a combination of some current landlords leaving, thereby giving more price setting power to remaining landlords, and greater long-run flexibility to raise rents."
This rental dynamic sits alongside, rather than inside, the headline house price revision — it is a distinct mechanism by which tax policy could affect the broader property market even as capital growth forecasts soften. The OBR separately assessed the Your First Home scheme and concluded it could marginally increase house prices by stimulating demand, though it expects the effect to be limited.
WPF Analysis: Implications for Buyers and Investors
World Property Forum analysis: A downgrade from roughly 2.4% to 2.1% projected growth in 2026, and from 3.0% to 2.5% in 2027, is not a dramatic reversal, but it confirms the UK market is tracking below the path the OBR itself expected as recently as March. For owner-occupiers and domestic buyers, this points to a slower equity-building environment over the next two years than previously modelled. For landlords specifically, the combination of softer capital growth projections and the flagged two-percentage-point income tax increase on rental earnings creates a double pressure: weaker capital appreciation alongside a higher running cost of holding a buy-to-let asset.
World Property Forum analysis: The £3.2 billion stamp duty shortfall for 2026-27, and the average £3.9 billion annual shortfall projected thereafter, suggests the Treasury's own revenue planning now assumes a materially quieter transaction market than it did in March. For investors weighing a UK purchase against other markets, this is a signal worth factoring into timing decisions — a market the fiscal watchdog itself expects to generate fewer completed transactions is one where liquidity and resale timelines may be longer than headline price trends alone would suggest. Buyers comparing the UK against other established European destinations may find it useful to review WPF's Buying Property in Portugal — Complete Guide, given Portugal's distinct transaction and tax environment, or the broader Global Property Markets hub for jurisdiction-by-jurisdiction comparisons.
Due Diligence Questions Raised by the Revision
The OBR's own caveats point to several questions that buyers and landlords should be asking rather than assuming answers to. First, how sensitive is a specific purchase decision to further mortgage rate movements, given the OBR explicitly flags rate trajectory as a key variable behind its downgrade? Second, what is the realistic timeline for resale or exit, given transaction volumes are forecast to run 4% below the previous estimate through the remainder of the decade?
Third, for anyone holding or considering a UK rental property, what is the net effect of the flagged two-percentage-point income tax rise on rental income once factored against current yield assumptions? The source material does not quantify this net effect for individual portfolios, and the OBR's own commentary stops at describing the directional pressure on rents and landlord supply rather than modelling specific after-tax returns.
Limitations and What to Watch Next
This analysis is built on a single reported source — Property Wire's account of the OBR's Autumn Budget economic outlook — and the World Property Forum publication ledger, which recorded 242 published articles across WPF's coverage in the 90 days to 2026-10-29. That ledger figure describes WPF's own publication activity, not UK market conditions, and should not be read as a proxy for transaction volumes, prices, or yields. No independent second source corroborating the specific OBR percentage figures was available at the time of writing, and readers should treat the figures as reported pending wider confirmation from other coverage of the same OBR outlook.
The OBR itself stresses that its forecasts remain "highly sensitive" to mortgage rate trajectory, real income growth, and planning or regulatory changes to housing supply. Readers tracking this story should watch for the OBR's next scheduled forecast update, further Treasury commentary on the stamp duty shortfall, and any confirmation of the timeline for the flagged rental income tax change, which Property Wire's related coverage indicates is expected to take effect from April 2027.