The origins of Income Tax in the UK

Income tax is often viewed as a permanent feature of the UK tax system, but historically it began as a temporary wartime measure. Its origins lie at the end of the eighteenth century, when the British government faced the enormous cost of financing the war against Napoleonic France.

The first modern income tax was introduced by William Pitt the Younger in 1799, intended to be repealed once the war ended—a promise that, clearly, was not kept for long.

The original structure

Pitt's income tax was levied at a rate of two shillings in the pound (10%) on incomes above £60, with a sliding scale for those earning between £60 and £200. It was a radical measure at the time, as direct taxation was deeply unpopular and seen as an intrusion into private affairs. To ease concerns, the government allowed taxpayers to declare their income to local commissioners rather than central government officials.

Repeal and reintroduction

When the Treaty of Amiens brought a brief peace in 1802, the tax was repealed by Henry Addington, who succeeded Pitt as Prime Minister. However, when war broke out again the following year, Addington reintroduced it. Crucially, Addington changed the way the tax was collected, introducing the principle of deducting tax at source (for example, from interest payments and government salaries)—a system that remains the foundation of modern PAYE.

A permanent fixture

Following the Battle of Waterloo in 1815, income tax was abolished once more, to the great relief of the public. It remained off the statute books until 1842, when Sir Robert Peel reintroduced it, ostensibly as a temporary measure to address a peacetime budget deficit. Despite repeated promises by successive Chancellors (most notably William Gladstone) to abolish it, income tax proved too lucrative to abandon and gradually became the permanent centrepiece of the UK tax system.