How emerging proposals could transform stamp duty, council tax, and capital gains relief
The way property is taxed in the UK may be at a turning point. Recent reports indicate that the Treasury is actively considering options to overhaul the system by replacing or adding to stamp duty, updating council tax, and revisiting capital gains relief on homes. Some proposals already discussed draw on think-tank ideas and early official modelling[1].
Where things stand now
Today’s property tax system in England and Wales is based on three main components: stamp duty, council tax, and the exemption from capital gains tax for principal residences. Stamp duty (also known as Stamp Duty Land Tax, SDLT) is charged on property purchases in progressive tiers, with reliefs available for first-time buyers and additional surcharge rules for second homes.
Council tax is an annual recurring charge based on property valuation bands, originally introduced in the early 1990s. The principle that the sale of a primary residence is exempt from capital gains tax remains a longstanding cornerstone of residential property taxation.
These systems have their own flaws: stamp duty creates a distortion at the point of purchase, discouraging mobility; council tax is based on valuations that in many areas remain decades out of date; and the capital gains relief, while generous, is being re-examined in light of rising property values and government revenue pressures.
Confirmed direction: What’s already underway
Although no definitive reform has been legislated yet, some ideas under consideration align with changing public statements and policy research. These reports indicate that officials have been tasked with modelling a new national property tax to replace stamp duty for certain owner-occupied transactions. In particular, one proposal would levy the new tax on homes sold for more than £500,000, a threshold chosen to limit disruption to lower-value property transactions.
Commentators and think tanks, such as Onward, have proposed frameworks that suggest combining proportional property tax rates (e.g., 0.54% for mid-tier values, with a supplement above £1 million) with a baseline levy for all homes, thereby reducing reliance on council tax bands and stamp duty spikes.
At the same time, the government is reportedly considering whether council tax should eventually be replaced by a local property tax linked to current property values, thereby shifting revenue responsibility more directly to property owners rather than tenants[2].
Key proposals under debate
Replacing stamp duty with a proportional tax
One of the more specific proposals under review is the idea of replacing stamp duty for owner-occupiers in higher-value brackets. For example, homes sold for more than £500,000 could be taxed proportionally through a property tax, rather than the current SDLT system.
Local property tax in place of council tax
A complementary reform involves phasing out council tax entirely and implementing a local property tax based on current valuations and local levies. This would shift the financial burden to property owners and likely necessitate a revaluation of numerous homes, which hasn’t occurred in decades.
Revisiting capital gains relief on main homes
Perhaps the most contentious idea is to remove or restrict the exemption on capital gains tax for a primary residence. Under such a change, gains realised from a home’s appreciation, currently exempt, might become taxable above a certain threshold.
Who could be affected?
High-value property owners are the most vulnerable under these proposals. If the new property tax threshold starts at £500,000, much of London, the South East, and many properties in the commuter belt would immediately come under review. Owners who frequently relocate may find themselves facing higher bills with each sale.
Homeowners in areas with strained local finances might face higher local charges if council tax is replaced with a property tax based on value. In regions experiencing rapid price increases, tax obligations could outpace household incomes.
Meanwhile, removing the principal private residence exemption would result in many households being taxed on their homes, which they had expected to remain exempt. This change fundamentally alters expectations about residential property wealth.
What to watch next
The upcoming Finance Bill 2025/26 serves as the legislative framework for any new property tax measures that may be introduced. In the coming months, draft clauses might be shared for consultation before the final bills are presented in Parliament.
However, the government is walking a tightrope: reforming property taxes is politically sensitive, especially among middle-income homeowners who may feel unfairly burdened with new tax obligations. The modelling must balance revenue demands against market stability and fairness.
Final reflections
Much of what is being discussed stays in the exploratory and modelling stage. However, the proposals currently on the table suggest a potential shift from transaction-based taxation to recurring property-based taxation.
Homeowners and investors would do well to monitor developments closely. What is likely is that any change will be phased, targeted, and structured to avoid immediate disruption, but the direction is toward closer scrutiny of property wealth than we have seen in decades.
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Source data:
[1] ukonward.com/reports/a-fairer-property-tax/
[2] gov.uk/government/collections/finance-bill-2025-26