Income Tax in the United Kingdom

Introduction

Income tax is the principal direct tax levied on individuals in the United Kingdom. The tax is governed by the Income Tax (Earnings and Pensions) Act 2003 (ITEPA 2003) for employment income, the Income Tax (Trading and Other Income) Act 2005 (ITTOIA 2005) for trading and other income, and the Income Tax Act 2007 (ITA 2007) for general provisions including rates, reliefs, and administration. Income tax is collected through the Pay As You Earn (PAYE) system for employees and through self-assessment for the self-employed and others.

The Structure of Income Tax

Income tax is charged on the taxable income of individuals for each tax year running from 6 April to 5 April. Taxable income is calculated by deducting allowances and reliefs from total income. The principal allowance is the personal allowance, which is the amount of income that an individual may receive without paying tax. The personal allowance is currently set at £12,570 and is reduced for individuals with adjusted net income over £100,000.

Income tax is charged at progressive rates on different bands of income. The basic rate (20 per cent) applies to income between the personal allowance and the basic rate limit; the higher rate (40 per cent) applies to income between the basic rate limit and the additional rate threshold; and the additional rate (45 per cent) applies to income above the additional rate threshold.

Different rates apply to savings income and dividend income, which benefit from separate allowances and lower rates.

Employment Income

ITEPA 2003 charges income tax on earnings from an employment. Earnings include: salaries, wages, bonuses, commissions, and fees; benefits in kind (such as company cars, private medical insurance, and accommodation); and termination payments (subject to exceptions and reliefs).

Employers are required to deduct income tax and National Insurance contributions from employees’ pay under the PAYE system and to account to HM Revenue and Customs (HMRC) for the amounts deducted.

Trading Income

ITTOIA 2005 charges income tax on the profits of a trade, profession, or vocation carried on by an individual. The profits are calculated in accordance with generally accepted accounting practice, subject to adjustments for tax purposes. Capital allowances are available for expenditure on plant, machinery, and other capital assets.

The self-employed and partners in partnerships are required to report their income and gains through the self-assessment system, filing an annual tax return and paying tax in two instalments (payments on account).

Allowances and Reliefs

The principal allowances and reliefs include: the personal allowance; the married couple’s allowance (available to older couples); personal savings allowance (tax-free interest of up to £1,000 for basic rate taxpayers); dividend allowance (tax-free dividends of up to £1,000); and gift aid (relief for charitable donations).

Reliefs include: pension contributions (relief on contributions up to certain limits); loss relief (for trading losses); and entrepreneurs’ relief (now business asset disposal relief, reducing the rate of capital gains tax on the disposal of a business).

Self-Assessment

The self-assessment system requires individuals to notify HMRC of their chargeability to income tax and capital gains tax and to file an annual tax return. The return must be filed by 31 January following the end of the tax year for online returns. Late filing and late payment penalties apply.

HMRC operates a compliance programme, including random enquiries, targeted investigations, and the use of data to identify non-compliance.

HMRC Enforcement

HMRC has extensive enforcement powers, including the power to: issue information notices requiring taxpayers to provide documents and information; conduct compliance checks and investigations; make assessments of tax due where returns are not filed; impose penalties for late filing, late payment, and inaccuracies; and prosecute criminal offences of tax evasion.

Conclusion

Income tax in the United Kingdom is a progressive tax on individual income, collected through PAYE for employees and self-assessment for the self-employed and others. The structure of allowances, rates, and reliefs reflects policy objectives of equity, efficiency, and simplicity, while HMRC’s enforcement powers ensure compliance with the tax code.