UK Income Tax History: How Rates Have Changed Since 1799
Income tax is often described as a temporary measure — because it literally was, when it was first introduced. More than 225 years later, it remains the UK's single largest source of government revenue. Here is how the rates evolved from William Pitt's wartime emergency to today's system.
1799: the first income tax
William Pitt the Younger introduced income tax on 9 January 1799 to fund the war against Revolutionary France. The rate was a flat 10% — applied to incomes above £60 per year (approximately £7,000 in today's money). Pitt promised it was temporary. It raised around £6 million in its first year — equivalent to roughly £700 million today.
1816: the first abolition
After Napoleon's defeat at Waterloo in 1815, public pressure to abolish the tax was overwhelming. Parliament voted to end income tax in 1816. All records were ordered to be destroyed — an extraordinary act that reflected how unpopular the tax was. The Treasury had to burn the records in the courtyard of the Houses of Parliament.
1842: Peel's 'temporary' reintroduction
Sir Robert Peel reintroduced income tax in 1842 at 3% (sevenpence in the pound) to plug a budget deficit. He assured Parliament it was a three-year temporary measure to allow free trade reforms to raise revenue in the longer term. It has never been abolished since.
1909: the People's Budget
David Lloyd George's radical 1909 Budget introduced a 'supertax' — an early form of higher rate income tax — on incomes above £3,000 per year. The top rate reached 8%, and the Budget introduced taxes on land values and unearned income. The House of Lords rejected it, triggering a constitutional crisis.
World War I: rates climb sharply
The First World War transformed income tax from a levy on the wealthy few to a mass tax. By 1918, the standard rate had risen to 30% — a threefold increase from pre-war levels. The number of taxpayers expanded dramatically as the threshold was lowered and more incomes came into scope.
World War II: the 99.25% peak
The Second World War produced the highest income tax rates in UK history. By 1941-42, the standard rate was 50% (ten shillings in the pound), and the highest rates on investment income reached 99.25%. This combined income tax and a temporary 'surtax' on high unearned income. For context, earning £1 in investment income meant keeping under a penny after tax.
These rates persisted into the 1950s before gradual reduction. By the late 1970s, the top marginal rate on earned income was 83%, rising to 98% on unearned (investment) income.
1979-1988: the Thatcher cuts
Margaret Thatcher's government made sweeping cuts to income tax rates:
- 1979: top rate cut from 83% to 60%; standard rate cut from 33% to 30%
- 1988: top rate cut from 60% to 40%; basic rate cut from 29% to 25%
These cuts were highly controversial but reflected a fundamental shift in economic philosophy — from redistribution to incentivising enterprise.
1992-2008: further reductions
John Major's government cut the basic rate from 25% to 23% in 1996, and Gordon Brown subsequently reduced it to 22% in 1999 and then to 20% in 2008 — where it remains today.
2010: the 50% Additional Rate
Gordon Brown's final Budget in 2010 introduced a 50% Additional Rate on income above £150,000. This was the first increase in the top rate since the 1970s. George Osborne cut it to 45% in 2013, citing evidence that the 50% rate raised less revenue than expected due to behavioural effects.
2013 to today: the current system
| Band | Rate | Threshold (2025-26) |
|---|---|---|
| Personal Allowance | 0% | Up to £12,570 |
| Basic Rate | 20% | £12,571 to £50,270 |
| Higher Rate | 40% | £50,271 to £125,140 |
| Additional Rate | 45% | Above £125,140 |
Tax Freedom Day
'Tax Freedom Day' is the date in the year by which the average UK worker has earned enough to pay their total annual tax bill. In 2025 it falls in late May — meaning the average person works over four months of the year for the government before keeping a penny for themselves. The concept was introduced by the Adam Smith Institute and remains a useful illustration of the total tax burden, even if critics note it oversimplifies the picture.
Frequently asked questions
Has income tax ever been abolished in the UK?
Yes — once, in 1816, after Waterloo. Pitt the Younger had introduced it in 1799 as a war measure, and Parliament abolished it the year after the war ended. Peel reintroduced it in 1842 as another 'temporary' measure. It has never been abolished since.
Which country has the highest income tax rate in the world?
Sweden, Finland, and Japan have historically had some of the highest marginal rates — reaching over 50% at relatively modest incomes. The UK's 45% Additional Rate is high by historical UK standards but broadly comparable to other major European economies at the top end.