Adjusted Net Income Explained (UK)
Adjusted Net Income is an important concept within the UK tax system, particularly for higher earners whose income approaches or exceeds £100,000.
Many tax thresholds and allowances are calculated using adjusted net income rather than total salary alone. Because of this, understanding how adjusted net income works can help individuals better understand how their tax position is calculated.
For example, adjusted net income determines whether a person begins to lose their personal allowance once income exceeds £100,000.
HM Revenue & Customs explains how adjusted net income is calculated and when it applies here: gov.uk/guidance/adjusted-net-income
In this article
Quick Summary
This may help you:
- Understand what adjusted net income means
- See how income thresholds are calculated
- Understand how the personal allowance may be reduced
- Learn how pension contributions may affect taxable income
Before deciding, check:
- Your total taxable income
- Pension contributions and tax relief
- Whether income exceeds £100k
- How allowances may be affected
Part of the Income Over £100k series
- 2026/27 High Earner Financial Checklist
- The £100k Tax Trap Explained
- Adjusted Net Income Explained (UK)
- How Bonuses Can Push Income Above £100k
What Is Adjusted Net Income?
Adjusted net income is a calculation used by HM Revenue & Customs to determine eligibility for certain tax allowances.
It is based on a person's total taxable income minus specific deductions.
These deductions may include:
- Pension contributions
- Gift Aid donations
- Certain trading losses
The resulting figure is referred to as adjusted net income.
This figure is used to determine whether certain allowances or tax rules apply.
How Adjusted Net Income Is Calculated
Adjusted net income starts with total taxable income.
This may include:
- Salary and bonuses
- Dividend income
- Rental income
- Interest from savings
- Pension income
From this total, certain deductions may be applied, such as pension contributions or charitable donations made under Gift Aid.
HMRC provides detailed guidance on the calculation here: gov.uk/guidance/adjusted-net-income
Why the £100k Threshold Matters
Adjusted net income becomes particularly important once income exceeds £100,000.
At this level, the personal allowance begins to reduce.
The personal allowance is reduced by £1 for every £2 of income above £100,000.
By approximately £125,140, the personal allowance is fully removed.
This can create what is commonly referred to as the £100k tax trap, where the effective marginal tax rate becomes significantly higher.
Our article on the £100k tax trap explained explores how the personal allowance withdrawal affects effective tax rates.
How Pension Contributions Affect Adjusted Net Income
Pension contributions may reduce adjusted net income because they receive tax relief.
For individuals close to the £100,000 threshold, pension contributions may help reduce adjusted net income and therefore preserve some or all of the personal allowance.
This is one reason pension contributions are often considered as part of broader financial planning.
Our guide on pension tax planning explained explains how pension contributions interact with tax relief and allowances in more detail.
Salary sacrifice arrangements can also reduce adjusted net income through redirecting pre-tax salary into pension contributions. Our article on salary sacrifice explained covers how this arrangement works.
When Adjusted Net Income Becomes Important
Adjusted net income becomes particularly relevant for individuals with:
- Income approaching £100,000
- Bonus-heavy compensation structures
- Dividend income from investments or businesses
- Multiple sources of income
In these situations, relatively small changes to income levels or contributions can affect how allowances are applied.
Our article on how to reduce your income tax legally in the UK explores several strategies that may influence adjusted net income and overall tax position.
Key Considerations
| Factor | Why It Matters |
|---|---|
| Income level | Determines whether personal allowance is reduced |
| Pension contributions | Can reduce adjusted net income |
| Tax thresholds | Affect effective marginal tax rates |
| Financial planning | May help manage income thresholds |
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Financial planning decisions depend on individual circumstances. If you would like clarity on how the topics discussed may apply to your situation, TrustEvo can connect you with a regulated financial adviser.
This article is provided for general information only and does not constitute financial advice. Financial decisions depend on individual circumstances and regulated financial advice may be appropriate in some situations.