GBTT Investigation · Tax
How stamp duty costs Britain more than it raises. What started out as a way to fund war against the French ended up funding a war against our own young and upwardly mobile.
Stamp duty was introduced in 1694 as a temporary wartime levy under William III, intended to finance a conflict with France. The war ended three years later. Three hundred and thirty-two years on, the tax raises around 1.5 per cent of government revenue and destroys an estimated £10 billion a year in economic value.
For every pound of additional revenue stamp duty generates, between 40 and 80 pence is destroyed in deadweight economic loss. That estimate comes from Hilber and Lyytikäinen at the London School of Economics. Applied to the revenue base, the Adam Smith Institute calculates that SDLT inflicts approximately £10 billion per year in deadweight losses on the British economy. Economists in Australia, studying a comparable transaction tax, found stamp duty was roughly four times more damaging than income tax per pound raised, and nearly eight times more harmful than VAT.
The IFS, the Mirrlees Review, and the OBR have all, independently, described SDLT as among the most economically destructive taxes in the British system. Paul Johnson, then Director of the IFS, has said that a rationally designed tax system would retain council tax in some form but would not contain stamp duty at all.
Stamp duty is not a tax on property wealth. It is a tax on movement. A wealth tax applies to what you own. A transaction tax applies when you try to change your circumstances. SDLT does not touch the homeowner who sits still for thirty years in a property that no longer suits their needs. It punishes families who need more space and retirees who want less. It taxes the decision to act, and in doing so, it ensures that fewer people do.
The OBR estimates that a one percentage-point increase in SDLT reduces transaction volumes by 5–7 per cent. A two percentage-point rise, according to the LSE research, reduces household mobility by 37 per cent. For every £100 the Treasury gains from such an increase, households require £84 in compensation to maintain the same level of wellbeing. The tax does more than take money. It makes people measurably worse off beyond the amount taken.
Owner-occupiers in England now move once every 16–20 years. Annual residential sales fell to 695,000 in the year to March 2025, less than half the 1.5–1.7 million recorded before 2008. The ONS reports that the median home in England costs 7.7 times average annual earnings. In 1999, 69 per cent of local authority areas had house prices below five times average earnings. By 2024, that figure was 9 per cent.
A family buying a £400,000 home in England pays £10,000 in stamp duty before they unpack a box. For a household on the median income, that is roughly five months of net earnings. On the LSE estimates, £4,000–£8,000 of that figure is pure economic destruction — value transferred to no one.
The damage extends beyond housing. The Tony Blair Institute's March 2026 report on UK economic dynamism found that Britain ranks worst among OECD nations for matching workers to appropriate roles. The underlying OECD data is striking: 37 per cent of English workers are employed in jobs below their qualification level, the highest rate among 31 major economies surveyed. Stamp duty is identified as one of the barriers to the labour mobility that would improve matching.
A worker in Newcastle offered a better role in Manchester must factor in a five-figure tax bill to accept. The rational decision, for many, is to stay. SDLT does not just freeze the housing market. It freezes the labour market. Workers who cannot move cannot earn what they are worth. The OECD data shows that overqualified workers in England earn nearly 18 per cent less than peers matched to appropriate roles.
Stamp duty is not the only cause of poor labour matching. But it is a policy lever that actively prevents the geographic movement that would close the gap. That makes it not just a housing tax or a transaction tax but a wage suppression mechanism, one that falls hardest on younger workers who have not yet accumulated the capital to absorb a five-figure relocation penalty.
SDLT raises £15.2 billion a year. It is progressive in structure: higher-value properties pay higher rates. Roughly half of recent residential revenue comes from the 5 per cent surcharge on additional properties, targeting second homes and buy-to-let investors. It taxes wealth transfers rather than income. It is already in place. Any replacement, particularly a recurring annual property tax, would face enormous political resistance from asset-rich, cash-poor homeowners who have built retirement plans around untaxed property appreciation.
The revenue is real. The political cost of replacement is high. The question is whether the method of collecting £15.2 billion costs the economy more than £15.2 billion.
The Adam Smith Institute's December 2025 paper modelled the effects of abolishing SDLT on primary residences. Abolition would unlock approximately 349,000 additional housing transactions per year, including an estimated 38,000 new-build units. The bulk of the economic benefit, £12.9 billion, comes from increased construction. Higher wages from improved labour mobility and greater consumer spending account for a further £4.4 billion. Homeowner mobility would increase by 56 per cent.
The static revenue cost would be £9.2 billion per year. But higher VAT, income tax, National Insurance and corporation tax receipts generated by the increased economic activity would offset approximately 45 per cent of the loss. The net fiscal cost: roughly £5.1 billion annually.
The government voluntarily surrendered £5.5 billion in stamp duty revenue during the 2020–21 holiday. Permanent abolition of SDLT on primary residences would cost £5.1 billion net annually, after accounting for the tax revenue unlocked by the economic activity it would generate. The holiday was called good economics. The permanent version is called politically impossible.
Replacing SDLT with a less distortive tax, such as a proportional annual property levy, could raise welfare by approximately 2.2 per cent through better housing allocation and higher transaction volumes. The IFS, the Mirrlees Review, and the Resolution Foundation have all called for exactly this.
From 1 April 2025, stamp duty thresholds reverted to their pre-2022 levels. The nil-rate band dropped from £250,000 to £125,000. First-time buyer relief fell from £425,000 to £300,000. The additional property surcharge rose from 3 per cent to 5 per cent. At no point in this tightening did the government dispute the economic evidence against the tax. It simply needed the money.
Labour and Conservative administrations alike have raised stamp duty, raised it again, and raised it a third time. The maths does not care who is in government.
Stamp duty was introduced in 1694 as a temporary measure to fund a war with France. The war ended in 1697.