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Higher Income Tax Rates UK: When Do 40% and 45% Income Tax Rates Apply?
Understanding higher income tax rates UK is essential for employees, directors, and business owners whose income approaches key tax thresholds. Many taxpayers are unaware that income between £100,000 and £125,140 can result in a significantly higher effective tax rate due to the personal allowance taper. For a complete overview of how personal tax works across all income levels in the UK, our ultimate guide to personal tax in the UK provides the broader framework before exploring higher rate thresholds in detail.
This guide explains how income tax thresholds UK work, when the 40% and 45% rates apply, and why the personal allowance taper can create an effective 60% marginal tax rate under HMRC rules.
These rules apply to all UK taxpayers regardless of income source and are particularly relevant for individuals receiving salaries, dividends, or performance-based bonuses.
The Personal Allowance Threshold
The standard personal allowance is £12,570.
Where adjusted net income exceeds £100,000, the personal allowance is gradually withdrawn under UK income tax thresholds UK rules.
For every £2 of income above £100,000, £1 of personal allowance is withdrawn.
At £125,140, the personal allowance is fully withdrawn, which directly contributes to the personal allowance taper effect. For a full breakdown of all current income tax bands and how they interact with the personal allowance, see our guide on current income tax bands and allowances. Those specifically affected by the £100,000 income ceiling can also refer to our dedicated guide on how the £100,000 ceiling affects your personal allowance for a focused explanation of how the withdrawal is triggered and calculated.
How the 60% Marginal Rate Arises
Between £100,000 and £125,140, income is effectively taxed at a higher marginal rate under higher income tax rates UK.
This occurs because:
- Income is taxed at the higher rate of 40%
- The personal allowance is gradually withdrawn under the personal allowance taper
The combined effect results in an effective marginal tax rate of up to 60% within this income band.
For a detailed explanation of what happens when your personal allowance is withdrawn and how this affects your overall tax position, see our dedicated guide on losing your personal income tax allowance.
Adjusted Net Income Explained
The taper applies based on adjusted net income, not just salary alone, under income tax thresholds UK rules.
This includes:
- Salary and employment income
- Dividends from company ownership
- Bonuses and performance-related pay
- Other taxable income sources
If adjusted net income exceeds £100,000, the taper applies regardless of how the income is structured.
For a fuller understanding of how income tax is calculated across different income types and what changes have been made to these calculations, our guide on changes to the calculation of income tax provides the technical detail behind how HMRC determines your final tax liability.
Real-World Application
In practice, the impact of higher income tax rates UK is often seen in common scenarios: An employee receiving a year-end bonus that pushes income above £100,000. A company director increasing dividend withdrawals. A consultant combining multiple income streams that exceed threshold limits. In each case, individuals may unintentionally enter the 60% effective tax band due to the personal allowance taper. If you are unsure whether your total income from all sources crosses this threshold, our guide on what it means if your income is over £100,000 helps you identify your position and understand the immediate tax implications that follow.
UK-Wide Application of the Rules
The personal allowance taper applies consistently across the UK.
Although income tax bands differ in Scotland, the withdrawal of the personal allowance between £100,000 and £125,140 remains the same under HMRC rules governing income tax thresholds UK.
It is also worth noting that because personal allowances have been frozen rather than uprated with inflation, more taxpayers are being pulled into higher rate bands each year a phenomenon known as fiscal drag. Our guide on frozen tax allowances and fiscal drag explains how this affects taxpayers whose income has grown but whose allowances have not.
Planning Considerations
If your income is approaching £100,000, proactive planning can reduce exposure to higher effective tax rates.
- Review total expected income before year-end
- Consider pension contributions to reduce adjusted net income
- Plan dividend and bonus timing carefully
Advance planning can help reduce exposure to the personal allowance taper and improve overall tax efficiency.
Planning ahead is made more important by the fact that personal tax allowances remain frozen until April 2028 our guide on personal tax allowances frozen to April 2028 explains what this freeze means in practice for higher earners and why the number of people affected by the taper is expected to increase over the coming years. For the specific impact of the freeze on the 2026/27 tax year in particular, our guide on tax allowances frozen for 2026/27 sets out what higher earners need to factor into their planning for that year.
Conclusion
Understanding higher income tax rates UK is essential for effective tax planning, particularly where income exceeds £100,000. The interaction between tax bands and the personal allowance taper can significantly increase marginal tax rates if not properly managed.
By monitoring income tax thresholds UK and planning ahead, individuals can reduce unnecessary tax exposure while remaining fully compliant with HMRC rules.
For higher earners looking to take a more structured approach to managing their overall tax position, our guide on modern high net worth tax strategy sets out the key planning considerations for individuals with complex income structures.
Approaching the Higher-Rate Threshold? Review Your Position
Higher and additional rate Income Tax thresholds can be triggered more easily than many taxpayers realise, particularly where dividends, bonuses, rental income, or benefit withdrawals are involved. Frozen bands mean income growth can quietly push you into a higher bracket, increasing overall liability. Seeking timely tax planning services London helps you assess when higher rates apply and structure income more efficiently. Cigma Accounting, advising clients from our Farringdon and supporting individuals in Islington and Spitalfields, provides clear analysis tailored to your income profile.
Crossing higher-rate thresholds can also reduce entitlement to certain allowances and increase effective marginal rates. Working with an experienced tax accountant in London allows you to plan remuneration, pension contributions, and dividend timing before year-end. Cigma Accounting offers practical, forward-looking support with physical offices across London, helping you manage exposure confidently while maintaining full compliance.
Frequently Asked Questions About Higher Income Tax Rates in the UK
When do higher income tax rates apply in the UK?
Higher income tax rates apply when your taxable income exceeds the basic rate threshold. Income above this level is taxed at higher rates depending on the tax band it falls into.
What are the income tax thresholds in the UK?
Income tax thresholds are the points at which different tax rates begin to apply. Once income passes the basic rate threshold, higher rates of income tax are charged on the additional earnings.
How do higher income tax rates UK work?
The UK uses a progressive tax system, meaning only the portion of income above each threshold is taxed at the higher rate, rather than taxing all income at the same rate.
What is the personal allowance taper?
The personal allowance taper reduces the tax-free personal allowance once income exceeds a certain level, gradually removing it for higher earners.
Who is affected by higher income tax rates?
Individuals with income above the basic rate threshold, including employees, self-employed individuals, and some company directors, may be affected by higher income tax rates.
Do higher income tax rates apply to all income?
Higher rates apply to taxable income above specific thresholds, which may include salary, self-employment profits, rental income, and other chargeable income.
UNCERTAIN WHEN YOU MOVE INTO HIGHER TAX BANDS?
Crossing into higher or additional rate tax can affect salary, dividends, rental income, and pension contributions. Understanding when these thresholds apply helps you plan withdrawals and income timing more efficiently.
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