What Is Income in Income Tax? What Counts and How It's Taxed

Income Tax doesn't apply to every pound that lands in your bank account. Some receipts are tax-free. Others fall under Capital Gains Tax instead. Getting this distinction wrong is one of the most common reasons HMRC opens an enquiry into a small business's affairs, and it's entirely avoidable.

This guide sets out what Income Tax covers, how it works in practice, and where small business owners most often trip up.

What is income in Income Tax?

For UK tax purposes, "income" doesn't simply mean money you receive. It's a legal term with a specific scope. HMRC treats as taxable income any receipt that falls within one of the categories set out in tax legislation – primarily the Income Tax (Earnings and Pensions) Act 2003 and the Income Tax (Trading and Other Income) Act 2005.

In plain terms, taxable income includes earnings from employment, profits from a trade or business, pension payments, savings interest, dividends, and rental profits. It does not include things like lottery winnings, most gifts, or proceeds from selling a personal asset (which may instead be subject to Capital Gains Tax).

The critical point for business owners: your turnover is not your income. Only your profit – turnover minus allowable expenses – is taxed. Confusing the two is remarkably common and leads to both overpayment and underpayment.

What the UK Income Tax system covers

Income Tax is one part of a broader system. It sits alongside National Insurance contributions (NICs), Capital Gains Tax (CGT), and other levies, each with its own rules, rates, and thresholds.

Income Tax applies to:

• Earnings – salaries, wages, bonuses, tips, and most benefits in kind from employment.
• Trading profits – the taxable profits of sole traders, freelancers, and partners.
• Pension income – State Pension, workplace and personal pensions, annuities.
• Savings interest – bank and building society interest, peer-to-peer lending returns.
• Dividends – distributions from UK and overseas companies.
• Property income – rental profits from land and buildings.
• Other income – trust distributions, certain royalties, and miscellaneous receipts caught by specific rules.

It does not cover capital gains on asset disposals (that's CGT), nor does it apply to inheritance (that's Inheritance Tax). National Insurance looks similar to Income Tax but operates under entirely separate legislation with different thresholds and rates.

How UK Income Tax works at a glance

Income Tax is charged on your total taxable income above your Personal Allowance. For the 2024/25 tax year, the standard Personal Allowance is £12,570, and it has been frozen at that level since 2021/22.

Tax is collected in two main ways. If you're employed or receiving a pension, your employer or pension provider deducts tax under Pay As You Earn (PAYE) before you receive payment. If you're self-employed, a company director with untaxed income, or have significant income from other sources, you report and pay through Self Assessment.

HMRC administers the system, though Scotland sets its own Income Tax rates and bands for Scottish taxpayers. Wales has the power to vary rates but has so far kept them aligned with England and Northern Ireland.

The UK tax year, residence, and scope of liability

Tax year dates

The UK tax year runs from 6 April to 5 April the following year. This oddity dates back centuries, but its practical consequence is straightforward: income received (or, in some cases, earned) between those dates falls into that tax year. A bonus paid on 4 April lands in one year; the same bonus paid on 7 April lands in the next – potentially at different rates if thresholds change.

For sole traders, the basis period rules have recently been reformed. From 2024/25 onwards, trading profits are taxed on a tax-year basis rather than the old accounting-period basis. If your accounting year end doesn't align with 5 April, you'll need to apportion profits.

Tax residence and domicile

Whether you owe UK Income Tax – and on which income – depends on your residence status, determined by the Statutory Residence Test. UK residents are generally taxed on their worldwide income. Non-residents are taxed only on UK-source income (such as UK rental profits or UK employment earnings).

Domicile is a separate concept. Historically, UK-resident individuals who were not UK-domiciled could use the remittance basis to avoid UK tax on foreign income kept overseas. From April 2025, the remittance basis is being abolished and replaced with a new regime for individuals who become UK tax resident after a period of non-residence. If you have foreign income, this is an area where professional advice is strongly recommended, as the transitional rules are complex.

⚠️ Attention: The April 2025 changes to non-domicile taxation are among the most significant reforms in a generation. If you or your business partners have overseas income, check the latest HMRC guidance or speak to an adviser before filing.

Taxable income: what counts

Employment income

Employment income covers wages, salary, bonuses, commission, tips, and most payments connected to holding an office or employment. It extends to taxable reimbursements and benefits in kind – company cars, private medical insurance, interest-free loans above £10,000, and similar perks.

Employers report these amounts to HMRC in real time through PAYE and, for benefits, through either payrolling or the annual P11D form. If you're a director paying yourself a salary, the same rules apply to your own company's payroll.

Allowable employment expenses are narrow. You can claim tax relief only on costs you must incur to do your job and that your employer doesn't reimburse – for example, professional subscriptions required by your role, or tools you're obliged to provide yourself. Travel from home to a permanent workplace is not deductible.

Self-employment and partnership profits

If you're a sole trader or partner, HMRC taxes your trading profit, not your turnover. This is the figure after deducting allowable business expenses and capital allowances.

Capital allowances apply where you buy equipment, vehicles, or other assets for the business. The Annual Investment Allowance (currently £1 million) lets most small businesses deduct the full cost of qualifying plant and machinery in the year of purchase.

Loss relief allows trading losses to be set against other income in the same year, carried back to the previous year, or carried forward against future profits of the same trade. The rules differ depending on how and when you claim, so it's worth checking each option.

Pension income

The State Pension is taxable but paid gross – no tax is deducted before you receive it. Instead, HMRC collects the tax due by adjusting the tax code on any other income you receive through PAYE. If you have no other PAYE income, you may need to pay through Self Assessment.

Workplace and personal pensions are usually taxed under PAYE. Tax-free pension commencement lump sums (typically 25% of your pension pot) are not taxable. Drawdown income and annuity payments are.

Savings interest

Since April 2016, most banks and building societies pay interest gross. Whether you owe tax on it depends on your total income and the Personal Savings Allowance (PSA): £1,000 for basic-rate taxpayers, £500 for higher-rate taxpayers, and nil for additional-rate taxpayers. There's also a starting rate for savings of 0% on the first £5,000 of savings income, available only if your non-savings income is below £17,570.

HMRC receives interest data directly from banks and adjusts your tax code or Self Assessment calculation accordingly.

Dividend income

Dividends are taxed at their own rates, which are lower than rates on other income. The Dividend Allowance is £500 for 2024/25 (reduced from £1,000 in 2023/24 and £2,000 in 2022/23). Above the allowance, dividends are taxed at 8.75% (basic rate), 33.75% (higher rate), or 39.35% (additional rate).

For company directors who pay themselves partly in dividends, the shrinking allowance has noticeably increased the tax cost. It's worth modelling your salary/dividend split each year rather than relying on a figure that worked two years ago.

Rental and property income

Rental income is taxed on profit – rent received minus allowable expenses such as letting agent fees, insurance, maintenance, and a proportion of other costs. Since April 2020, mortgage interest and other finance costs on residential lets are no longer deducted from profits; instead, you receive a basic-rate tax credit (20% of the finance costs). This change significantly increased the effective tax rate for higher-rate taxpaying landlords.

Furnished holiday lettings previously benefited from special rules – including capital allowances and loss offset against other income. These advantages were abolished from April 2025, bringing holiday lets in line with ordinary residential property.

Trusts, estates, and foreign income

Trust distributions and estate income during administration carry tax credits that may or may not cover your full liability – it depends on your marginal rate. Foreign income (overseas dividends, interest, pensions, and rents) is generally taxable for UK residents, with double tax relief available where you've already paid tax overseas. You claim this through Self Assessment.

Income that is not taxable

Not everything that arrives in your account is taxable. Common non-taxable receipts include:

• ISA returns – interest, dividends, and gains within an ISA wrapper are entirely tax-free.
• Premium Bond prizes – all prizes, including the £1 million jackpots, are free of Income Tax and CGT.
• Certain state benefits – Universal Credit, Housing Benefit, Disability Living Allowance, Personal Independence Payment, and several others are not taxable (though Jobseeker's Allowance and Carer's Allowance are).
• Genuine gifts and inheritance – a cash gift is not income. It may be relevant for Inheritance Tax but not Income Tax.
• Child maintenance – payments received for the maintenance of a child are not taxable.
• Compensation for personal injury – generally tax-free, though interest on delayed payments may not be.

If you're unsure, HMRC publishes a detailed list of taxable and non-taxable state benefits on GOV.UK.

Income vs capital: why the distinction matters

The boundary between income and capital determines which tax regime applies. Rental profits are income; the profit when you sell the property is a capital gain. Dividends are income; the gain when you sell the shares is capital.

Capital Gains Tax has its own annual exempt amount (£3,000 for 2024/25) and its own rates (18% and 24% for residential property; 10% and 20% for most other assets from October 2024). Reporting obligations differ, too – gains on UK residential property must be reported within 60 days of completion.

Windfalls, lottery prizes, and gambling winnings are generally not taxable as either income or capital gains. However, compensation payments can be more nuanced – an employment tribunal award for lost earnings is taxable as employment income, while an award for injury to feelings is usually not.

Gross income vs net income for tax

HMRC uses several income measures, and confusing them causes real problems – especially around benefit entitlements and the Personal Allowance taper.

Gross income is your total income before any allowances or deductions. Net income is what remains after deducting reliefs such as pension contributions and Gift Aid. Adjusted net income is a specific calculation – broadly, net income minus gross pension contributions and Gift Aid donations – used to determine whether your Personal Allowance is tapered and whether the High Income Child Benefit Charge applies.

Personal Allowance taper

Once your adjusted net income exceeds £100,000, your Personal Allowance is reduced by £1 for every £2 above that threshold. It disappears entirely at £125,140. The effect is a 60% marginal rate on income between £100,000 and £125,140 – higher than the 45% additional rate.

For small business owners with income near this level, making pension contributions or Gift Aid donations can bring adjusted net income below £100,000 and restore the full allowance. This is one of the most effective pieces of tax planning available.

High Income Child Benefit Charge

If you or your partner claim Child Benefit and either of you has adjusted net income above £60,000 (from 2024/25; previously £50,000), the higher earner faces a charge that claws back the benefit. At £80,000, the charge equals the full amount of Child Benefit received. This must be reported and paid through Self Assessment.

Allowances and reliefs that reduce Income Tax

Pension contributions attract tax relief either through relief at source (the provider claims basic rate; you claim higher/additional rate via Self Assessment) or net pay arrangements (your employer deducts contributions before calculating tax). Gift Aid donations are grossed up, extending your basic-rate band and potentially your higher-rate band.

The Trading Allowance and Property Allowance (each £1,000) are useful for individuals with very small side incomes – for instance, occasional freelance work or renting out a parking space. If your gross income from the activity is below the allowance, you don't need to report it. If it's above, you can choose to deduct the allowance instead of actual expenses.

Rates and bands across the UK

England, Wales, and Northern Ireland (2024/25)

Scotland (2024/25)

Scotland operates six bands rather than three, with rates ranging from 19% (starter rate) to 48% (top rate, on income above £125,140). If you're a Scottish taxpayer – determined by where you live, not where you work – your tax code will begin with "S". The thresholds and rates differ noticeably from the rest of the UK, so using an English tax calculator when you live in Edinburgh will give wrong results.

National Insurance is not Income Tax

National Insurance contributions often appear alongside Income Tax on payslips, but they are a separate charge with different thresholds, rates, and rules. Employees pay Class 1 NICs; self-employed individuals pay Class 4 on profits and (until recently) Class 2 as a flat weekly amount. NICs fund specific benefits – principally the State Pension – and are not reduced by pension contributions in the same way Income Tax is.

How you pay Income Tax

PAYE for employees and pensioners

Under PAYE, your employer or pension provider deducts Income Tax and NICs each pay period based on your tax code. The code reflects your allowances and any adjustments (for untaxed income, benefits in kind, or underpayments from prior years).

Common codes include 1257L (standard Personal Allowance for 2024/25), BR (all income taxed at basic rate, usually for a second job), and 0T (no allowances, often applied when HMRC doesn't have enough information). If your code looks wrong, contact HMRC promptly – an incorrect code means you'll either overpay or face a bill later.

At the end of the tax year, you'll receive a P60 from your employer summarising pay and tax deducted. If you leave a job, you get a P45. These documents matter for Self Assessment and for checking HMRC's records are correct.

Self Assessment

You must file a Self Assessment tax return if you are self-employed, a company director, have untaxed income above £2,500, or meet other criteria (such as the High Income Child Benefit Charge or income over £150,000). The return covers the tax year ending the previous 5 April.

Key deadlines: paper returns are due by 31 October; online returns by 31 January following the end of the tax year. Tax owed is also due by 31 January, with payments on account (advance payments towards next year's bill) due on 31 January and 31 July.

Making Tax Digital for Income Tax (MTD ITSA) will require sole traders and landlords with qualifying income above £50,000 to keep digital records and submit quarterly updates to HMRC from April 2026, with the £30,000 threshold following in April 2027.

⚠️ Attention: MTD ITSA is a significant change to how self-employed individuals and landlords interact with HMRC. If your trading or property income exceeds £50,000, start exploring compatible software well before April 2026 to avoid a last-minute scramble.

Calculating your Income Tax step by step

The following process is simplified, but it captures the logic HMRC applies.

Step 1 – Total your income. Add up each source: employment earnings, trading profits, pension income, savings interest, dividends, rental profits, and any other taxable receipts.

Step 2 – Deduct allowances and reliefs. Subtract your Personal Allowance (if available) and any other reliefs – such as pension contributions made under relief at source, or the trading/property allowances if you've elected to use them.

Step 3 – Apply rates and bands. Non-savings, non-dividend income is taxed first, then savings income, then dividends. Each type is taxed at the relevant rates, with savings and dividend allowances applied at their respective stages.

Step 4 – Deduct tax already paid. Subtract PAYE already deducted by employers or pension providers, any tax deducted at source, and any tax credits (such as the basic-rate credit for property finance costs). Add any charges, such as the High Income Child Benefit Charge.

The result is the tax you owe (or are owed).

Special situations and edge cases

Company directors and dividends. If you run a limited company, the classic approach of a small salary plus dividends remains common. But with the Dividend Allowance now at just £500, the tax saving is smaller than it once was. Model the numbers each year – the optimal split depends on your total income, NICs thresholds, and whether you have other earnings.

Share schemes and RSUs. Enterprise Management Incentives (EMI), Company Share Option Plans (CSOPs), and restricted stock units each have different tax treatment. The income tax charge typically arises when options are exercised or restrictions are lifted, not when shares are granted. Timing and scheme type matter enormously.

Termination payments. The first £30,000 of a genuine redundancy or termination payment is usually tax-free. Payments in lieu of notice (PILON), outstanding holiday pay, and contractual bonuses are taxable in full. The treatment depends on the precise nature of each element, so professional advice is worthwhile for larger sums.

Non-resident landlords with UK rental income are taxed under the Non-Resident Landlord Scheme. Letting agents or tenants may need to deduct basic-rate tax unless the landlord has HMRC approval to receive rent gross.

Students don't receive a special tax status. If a student earns above the Personal Allowance, they pay Income Tax like anyone else. Student loan repayments are collected through PAYE (9% of earnings above the relevant threshold) or Self Assessment and are separate from the tax calculation itself.

Common mistakes and how to avoid them

Confusing turnover with profit. Your Self Assessment return asks for profit, not total sales. If you enter turnover instead, you'll massively overstate your income. Always deduct allowable expenses before arriving at your taxable figure.

Forgetting savings or dividend income. HMRC receives data from banks and share registrars. If you omit interest or dividends from your return – or assume they're covered by your allowances without checking – you may face a tax adjustment and a potential penalty.

Overlooking allowances and reliefs. The Marriage Allowance alone is worth up to £252 per year and can be backdated four years. Pension contributions above the basic-rate band require a Self Assessment claim. Many people simply don't claim what they're entitled to.

Mixing up Income Tax with National Insurance. Being below the Income Tax threshold doesn't mean you're below the NICs threshold (and vice versa). Both charges need to be considered when planning your take-home pay.

Getting help and staying compliant

HMRC tools. Your Personal Tax Account on GOV.UK lets you check your tax code, view your estimated Income Tax, and claim certain reliefs. HMRC also provides calculators for Self Assessment estimates, Marriage Allowance eligibility, and student loan repayments.

When to seek professional advice. If your income exceeds £100,000, you have foreign income, you're setting up or winding down a business, or you're dealing with share schemes or property portfolios, the cost of a good accountant is almost always repaid through correct planning and fewer surprises.

Appeals and corrections. You can amend a Self Assessment return within 12 months of the filing deadline. Overpaid tax can be reclaimed – sometimes going back four years. If you disagree with an HMRC decision, a formal appeal process exists, starting with an internal review and escalating to the tax tribunal if needed.

FAQ

Do children and teenagers pay Income Tax?

Yes. There is no minimum age for Income Tax. If a child's income exceeds the Personal Allowance, tax is due. However, special rules apply to income from parental gifts – interest on savings given by a parent is taxed as the parent's income if it exceeds £100 per year.

Are crypto staking rewards treated as income?

HMRC treats most staking and lending rewards as taxable income, valued at the market price on the date received. Disposing of the tokens later may trigger a separate Capital Gains Tax liability.

Can salary sacrifice lower my taxable income?

Yes. Salary sacrifice for pension contributions or ultra-low emission vehicles reduces your gross pay for both Income Tax and NICs purposes. This is one of the most efficient ways to reduce your tax bill if your employer offers the arrangement.

Are bank switching bonuses taxable?

Generally, yes. HMRC treats most cash incentives from banks – switching bonuses, referral rewards, and cashback offers – as taxable income. They may be collected through a tax code adjustment.

If I move to or from Scotland mid-year, which rates apply?

Your status as a Scottish taxpayer is determined by where you live on 5 April (or, in some cases, where you spend the most time). The Scottish rates apply to your entire non-savings, non-dividend income for that year – there is no mid-year split.