Earned income generally refers to income derived from active work or services, such as employment, office, trade, profession or vocation, rather than from passive investment or capital. In legal and tax practice across England and Wales, Scotland, Northern Ireland and Ireland, it is commonly contrasted with “unearned” or “investment” income (for example, interest, dividends, rents and most capital gains). In UK tax law, the concept broadly corresponds to income from employment, self-employment and certain pensions, as reflected in the Income Tax (Earnings and Pensions) Act 2003 and related legislation, although “earned income” itself is not always a defined statutory term. In Ireland, similar distinctions arise under the Taxes Consolidation Act 1997 between income from trades, professions, employments and other sources. The characterisation of income as “earned” is practically significant for: income tax computation and reliefs; social security and Universal Credit or welfare entitlements; maintenance and child support calculations; and assessment of loss of earnings in litigation and personal injury claims. Usage is broadly consistent across the UK and Ireland, but specific statutory definitions and thresholds should always be checked in context.