A recent report from the cross-party think tank Demos has called on Chancellor Rachel Reeves to adopt a series of tax reforms aimed at landlords, owners of high-value homes, and investors relocating from the UK. The proposals, designed to generate around £21 billion in additional revenue, include applying national insurance to rental income, ending certain inheritance tax reliefs, and introducing an “exit tax” for investors moving their assets abroad.
While the goal of creating a fairer tax system is understandable, increasing the tax burden on landlords carries risks that could have significant knock-on effects for both the private rental sector and the housing market more broadly.
The Growing Tax Burden on Landlords
Landlords have already experienced a notable rise in taxation and regulatory costs in recent years. Changes such as the withdrawal of full mortgage interest relief, the 3% stamp duty surcharge on additional properties, and tightening compliance requirements have all eroded margins.
Introducing national insurance contributions on rental income would effectively add a new layer of taxation to property investment. For smaller landlords in particular, this may tip the balance of profitability, making continued participation in the rental sector less attractive.
Supply Pressures and Rental Affordability
One of the clearest risks of higher taxation is its impact on supply. The private rented sector provides homes for nearly one in five UK households. If further tax changes lead landlords—especially smaller, individual ones—to exit the market, the result would be a reduction in available rental homes.
With demand for rental housing already at historic highs, any fall in supply risks pushing rents higher. In practice, measures intended to promote fairness could instead exacerbate affordability pressures on tenants, particularly younger people and families reliant on renting.
Implications for the Wider Housing Market
The effects would not be limited to the rental sector. Reduced landlord participation could create distortions across the housing market. For example:
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Properties sold by landlords are not always suited to the needs of first-time buyers, meaning disposals may not translate into wider ownership.
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Increased rental pressures could drive more households toward already stretched social housing provision.
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Market uncertainty may discourage investment in new housing, limiting long-term supply growth.
In short, weakening the role of landlords risks adding instability to an already strained system.
Alternative Policy Approaches
Raising additional revenue remains an important fiscal objective, but targeting landlords may not provide the most sustainable solution. More effective options could include:
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Encouraging new rental housing supply through planning reform and investment incentives.
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Targeting genuinely unproductive assets, such as long-term vacant properties, rather than occupied rental stock.
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Balancing tax reform with policies that ensure continued investment in the rental sector, protecting tenants from the consequences of reduced supply.
Conclusion
While the intention behind the Demos proposals is to create a fairer tax system without increasing headline rates of VAT or income tax, the unintended consequences for the housing market could be severe. Heavier taxation of landlords risks reducing the supply of rental homes, driving up rents, and destabilising the broader housing system.
A more balanced approach—one that combines fiscal responsibility with measures to expand housing supply—would better support both tenants and long-term market stability.