How Much is a 5% Raise Worth After Tax on a £100,000 Salary in United Kingdom?
The Quick Answer
If you earn £100,000 per year in United Kingdom and get a 5% raise, your gross annual pay increases by £5,000 to £105,000. After income tax and statutory payroll deductions (FICA/National Insurance/CPP/Medicare Levy), your net take-home pay increases by £1,900 per year (or £158 per month). This means the tax drag on your raise is 62.0%, allowing you to keep 38.0% of your new earnings.
Promotion Details
UK Tax Options
Raise Summary
Gross Increase
£5,000
Net Cash Increase
£1,900
| Calculation Level | Current Pay | New Pay | Net Change |
|---|---|---|---|
| Annual Gross Salary | £100,000 | £105,000 | £5,000 |
| Total Taxes & Payroll Levies | £31,443 | £34,543 | £3,100 |
| Net Take-Home Salary | £68,557 | £70,457 | £1,900 |
| Monthly Net Take-Home | £5,713 | £5,871 | £158 |
Why is my raise taxed at a higher rate than my base salary?
This phenomenon is known as **tax drag** or the **marginal tax rate effect**. In progressive tax systems (such as those in the US, UK, Canada, and Australia), your initial earnings take advantage of tax-free allowances and lower tax bracket rates.
However, when you receive a raise, the additional income does not benefit from those low brackets or standard deductions again. Instead, every single dollar of your raise is piled on top of your existing income and taxed at your highest **marginal tax bracket**. Consequently, a larger percentage of your raise is deducted for tax than the average tax rate on your baseline salary.
How to beat tax drag:
- In the US: Increase your pre-tax contributions to a traditional 401(k) or Health Savings Account (HSA) to shelter your raise from federal and state income taxes.
- In the UK: Divert a portion of your salary increase into your workplace pension scheme (particularly if using salary sacrifice) to avoid entering higher tax bands.
- In Canada: Allocate some of the incremental pay to your Registered Retirement Savings Plan (RRSP) to claim a tax deduction.
- In Australia: Make voluntary superannuation contributions (concessional contributions) to reduce taxable salary wages.