A push to dismantle the Treasury's approach to property taxation is gaining momentum ahead of next month's Budget. The National Residential Landlords Association has submitted a radical proposal to alter how Capital Gains Tax is assessed, arguing that the existing system penalises long-term investors on phantom inflationary growth rather than genuine financial gain.
Taxing Paper Gains Rather than True Wealth
Under the current system, landlords selling buy-to-let properties face tax liabilities on nominal rises in asset value, regardless of how much of that uplift has been hollowed out by general price increases. In its official representation submitted ahead of the October 28 Budget, the NRLA takes aim at suggestions mooted by some analysts that Capital Gains Tax rates ought to equalise with income tax.
The association argues the current mechanism is fundamentally flawed. Between 2015 and 2024, average UK house prices rose by 46.2 per cent. Over the exact same nine-year period, general inflation climbed by 34 per cent. When those figures are set against each other, real house price growth across the country amounted to just 9.1 per cent.
As the NRLA highlights, under current arrangements around four-fifths of the tax paid on capital gains over that period reflected inflation, not real growth in value. A landlord disposing of an asset held across the past decade is effectively being taxed on general monetary dilution rather than a genuine economic return.
The Mechanism for Reform
To correct this imbalance, the NRLA has laid out an alternative calculation method. The proposal urges the Treasury to calculate Capital Gains Tax by factoring in the original purchase price, Stamp Duty, associated acquisition costs, and subsequent capital improvements made to the property. From there, tax relief would apply based on the duration of ownership.
The central principle is straightforward: tax should be paid on real gains in value, not on inflation. By indexing relief against the length of time an investor has committed capital to a home, the policy aims to end the punitive treatment of patient capital.
The submission links tax reform directly to the wider performance of the private rented sector. In examining the costs for these reforms, the NRLA asked the Treasury to consider the broader economic benefits of a more dynamic market. Freeing up balance sheets allows landlords to unlock capital, particularly when it comes to financing essential energy-efficiency upgrades across aging housing stock.
Implications for the South East Rental Supply
In regions such as Kent, where property values are comparatively high and long-term capital appreciation has been pronounced, the tax burden of an exit or portfolio restructuring is severe. Many landlords across Tonbridge, Tunbridge Wells, and Sevenoaks have held rental assets for ten, fifteen, or twenty years. When these owners consider selling an older Victorian terrace or modernising a portfolio to meet upcoming standards, the prospect of surrendering vast sums in Capital Gains Tax creates a frozen market.
This friction harms tenants as much as property owners. Landlords who find themselves trapped by punitive exit penalties often defer major refurbishments or choose not to recycle equity into newer, greener rental properties. A system that accounts for inflation and acquisition costs would give local investors the liquidity needed to modernise homes or transition their holdings without incurring disproportionate tax penalties.
Beyond Capital Gains Tax, the NRLA's Budget submission addresses broader structural stresses in the market. The body has called for Local Housing Allowance rates to be reformed to ensure vulnerable tenants are not squeezed out of private lets, acknowledging that fiscal policy and social housing pressures remain tightly intertwined.
A Critical Juncture for the Treasury
Whether Chancellor John Healey will adopt an indexation-style relief remains uncertain, especially given the fiscal pressures facing Whitehall. Yet the argument presented by the sector exposes a genuine economic distortion that has quietly worsened through years of elevated inflation. For buy-to-let investors and tenants alike, the October Budget will serve as a definitive test of whether fiscal policy will continue to stifle property mobility, or finally adapt to economic reality.