What Is UK Income Tax?
Income Tax is one of the main taxes collected by HM Revenue & Customs (HMRC). It is charged on most forms of taxable income, including employment earnings, self-employed profits, pensions, rental income, savings interest above applicable allowances and certain state benefits. Income Tax provides funding for essential public services such as the NHS, education, policing, infrastructure and social care.
The amount of Income Tax you pay depends on your taxable income, your available allowances and the tax bands that apply to you. Most employees pay Income Tax automatically through the Pay As You Earn (PAYE) system, while many self-employed individuals and those with additional income report their earnings through a Self Assessment tax return.
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Who Pays UK Income Tax?
Most people living and working in the UK pay Income Tax if their taxable income exceeds their available Personal Allowance. Individuals commonly affected include:
- Employees
- Self-employed individuals
- Company directors
- Landlords receiving rental income
- Pensioners with taxable pensions
- People receiving investment income above allowances
Income Tax applies to UK residents and, in certain circumstances, to non-residents who receive taxable UK income.
Personal Allowance
The Personal Allowance is the amount of income most individuals can receive before paying Income Tax. If your total income remains within this allowance, you generally do not pay Income Tax.
For higher earners, the allowance is gradually reduced once adjusted net income exceeds £100,000. The allowance decreases by £1 for every £2 earned above this level until it is completely removed.
Income Tax Bands
After deducting any available Personal Allowance, your remaining taxable income is divided into tax bands. Each band is taxed at its own rate.
| Tax Band | Typical Rate | Description |
|---|---|---|
| Basic Rate | 20% | Applies to the first portion of taxable income. |
| Higher Rate | 40% | Applies once taxable income exceeds the basic rate limit. |
| Additional Rate | 45% | Applies to the highest levels of taxable income. |
Different tax rates and thresholds may apply in Scotland. Always check the latest HMRC guidance for the relevant tax year.
How PAYE Works
Pay As You Earn (PAYE) is the system used by employers to collect Income Tax directly from wages and salaries before employees receive their pay. Employers calculate deductions using the employee's tax code and send the tax directly to HMRC.
For most employees, PAYE means there is no need to complete an annual tax return unless they have additional taxable income or HMRC specifically requests one.
Self Assessment Tax Returns
Self Assessment is the system used by HMRC to collect Income Tax from individuals whose tax cannot be fully collected through PAYE. Common examples include self-employed people, landlords, partnerships and individuals with significant investment income.
Taxpayers must register for Self Assessment when required, submit accurate annual tax returns and pay any Income Tax owed by the relevant deadlines to avoid penalties and interest.
Income Tax Examples
Example 1 – Employee
Sarah earns £35,000 per year through employment. After applying her Personal Allowance, only part of her salary is taxable. The remaining taxable income falls entirely within the basic-rate band, so she pays Income Tax at the basic rate on that taxable amount.
Example 2 – Higher Earner
James earns £70,000 annually. Part of his taxable income is taxed at the basic rate and the remainder falls into the higher-rate band. His total Income Tax liability is therefore higher than someone earning £35,000 because different tax rates apply to different portions of his income.
Example 3 – High Income
Emma earns more than £100,000 each year. Her Personal Allowance begins to reduce because of the tapering rules. As her income continues to increase, more of her earnings become taxable and she may eventually lose her Personal Allowance altogether.
Ways to Reduce Your Tax Legally
- Make pension contributions.
- Donate through Gift Aid where appropriate.
- Use available ISA allowances.
- Claim eligible employment expenses.
- Ensure your tax code is correct.
- Claim all available tax reliefs.
Effective tax planning can reduce your overall tax liability while remaining fully compliant with UK tax legislation.
Calculate Your Income Tax
Rather than calculating your Income Tax manually, use our free UK Tax Calculator to estimate your tax liability, Personal Allowance, effective tax rate and net income in seconds.
Open Income Tax Calculator