JRF rent controls plan targets £1,200 annual savings for tenants by 2030

The Joseph Rowntree Foundation's latest intervention into rental market policy represents the most comprehensive attempt yet to square the circle of affordability and supply, proposing rent controls pegged to Consumer Price Index inflation alongside targeted tax reforms designed to retain landlord investment. The think tank's modelling suggests tenants could save £1,200 annually by 2030 under this dual approach, which would reverse George Osborne's Section 24 mortgage interest restrictions while applying National Insurance contributions to rental income for the first time.

The timing of this proposal reflects mounting pressure on rental affordability across Britain's major cities, where average rents have surged 30-40% since 2020 in markets including Manchester, Birmingham and Leeds. Current rental growth rates of 8-12% annually in these regional centres far exceed CPI inflation of approximately 4%, creating an acute affordability crisis that traditional market mechanisms have failed to address. By capping in-tenancy rent increases to inflation, the JRF argues landlords would retain real-terms income growth while preventing the rent shock experienced by sitting tenants when market rates spiral upward.

The proposed reversal of Section 24 restrictions represents a significant olive branch to buy-to-let investors, who have endured a systematic reduction in tax relief on mortgage interest payments since 2017. This change would restore full tax deductibility of borrowing costs, potentially improving net yields by 2-3 percentage points for highly leveraged landlords. However, the simultaneous introduction of National Insurance on rental income—currently exempt as unearned income—would claw back substantial revenue for the Treasury while adding approximately 2% to landlords' effective tax rates. For a landlord earning £50,000 in rental income, this would represent an additional £1,000 annual liability.

Regional market dynamics suggest differential impacts across Britain's rental landscape. In Surrey's premium rental markets, where yields already compress to 3-4%, the combined effect of rent controls and NI contributions could accelerate institutional investment at the expense of individual landlords. Conversely, higher-yielding markets in Liverpool and Newcastle might absorb these changes more readily, particularly if mortgage interest relief restoration offsets the new NI burden. London's rental market faces the most complex calculation, with rent control potentially stabilising the 40% of tenants currently experiencing annual rent increases above £2,000.

The Foundation's assertion that these measures would not trigger significant landlord departures relies on the assumption that tax relief restoration would compensate for controlled rental growth and additional NI costs. Analysis of comparable European markets suggests this calculation holds merit: German rental markets, operating under strict rent control regimes, maintain healthy institutional investment through favourable tax treatment and long-term capital appreciation prospects. However, Britain's buy-to-let sector's heavy reliance on capital growth over income yield creates different risk parameters, particularly in markets where house price appreciation has stagnated.

Commercial implications extend beyond residential rental markets, as institutional investors increasingly view rent-controlled environments as barriers to portfolio expansion. Build-to-rent developers, who have committed £60 billion to new supply over the next decade, would face fundamental reassessment of project viability if rental growth caps were implemented. This tension between affordability and new supply represents the central challenge of contemporary rental policy, with Birmingham and Manchester's build-to-rent pipelines particularly vulnerable to revised investment criteria under controlled growth scenarios.

The Foundation's proposal ultimately represents a calculated gamble that fiscal incentives can offset regulatory constraints without destroying rental supply. Given persistent rental shortage across major British cities—with vacancy rates below 1% in most regional centres—any policy intervention that maintains landlord participation while moderating rent growth deserves serious consideration. The combination of restored mortgage relief and inflation-linked rent caps offers a more sophisticated approach than blanket controls, creating a framework where rental investment remains viable while tenant displacement through unaffordable rent increases becomes impossible.