What is a tax threshold?
A tax threshold is the level of income at which a higher rate of tax begins to apply. In the UK, income is taxed progressively, meaning different portions of your income are taxed at different rates.
In 2026, many thresholds remain frozen, meaning more people are crossing into higher tax bands even with modest pay increases.
Why frozen thresholds matter
- More income taxed at higher rates
- Reduced real-terms take-home pay
- Loss of personal allowance for higher earners
How salary sacrifice affects taxable income
Salary sacrifice reduces your gross contractual salary, not just your take-home pay. This is a critical distinction.
When you enter a salary sacrifice arrangement, your employer formally lowers your salary in exchange for a benefit, such as a company car. Because your taxable income is reduced, income tax and National Insurance are calculated on a lower figure.
What salary sacrifice reduces
- Income tax liability
- Employee National Insurance contributions
- Employer National Insurance (in many schemes)
Can salary sacrifice move you into a lower tax band?
Yes — if the sacrificed amount reduces your taxable income below a tax threshold, the higher rate of tax will no longer apply to that portion of your earnings.
This is particularly powerful for employees who sit just above a threshold, such as higher-rate taxpayers.
Example scenario
- Your salary places you just into a higher tax band
- You enter a salary sacrifice car scheme
- Your contractual salary reduces
- Your taxable income falls below the threshold
In this scenario, part — or all — of your income is taxed at a lower rate than before.
Electric car salary sacrifice example
Electric vehicle (EV) salary sacrifice schemes are one of the most effective tools for reducing taxable income due to their low Benefit-in-Kind (BiK) rates.
Why EV salary sacrifice is so effective
- Low BiK rates compared to petrol or diesel cars
- Monthly cost taken from gross salary
- Insurance, servicing, and maintenance often included
- Potential real-world savings of 30–60%
For employees close to a tax threshold, this combination can significantly reduce both tax liability and overall motoring costs.
Important considerations before using salary sacrifice
While salary sacrifice can be highly effective, it’s not suitable for everyone.
Things to check before proceeding
- Impact on pension contributions
- Effect on mortgage or affordability assessments
- Minimum wage compliance
- Eligibility through your employer
Always review how a reduction in contractual salary may affect other benefits and financial assessments.
Frequently Asked Questions
Can salary sacrifice reduce my taxable income?
Yes — salary sacrifice reduces your gross taxable income, which can lower income tax and National Insurance.
Can salary sacrifice move me into a lower tax band?
Yes — if your sacrificed salary reduces your income below a tax threshold, you may fall into a lower tax band.
Does salary sacrifice affect take-home pay?
Yes — your take-home pay reduces, but tax savings often offset much of the reduction.
Is salary sacrifice legal?
Yes — salary sacrifice is a legitimate and widely used arrangement approved under UK tax rules.
Does salary sacrifice affect pensions?
It can, depending on how pension contributions are calculated. Always check with your employer.
Disclaimer: Tax thresholds, rates, and salary sacrifice rules may change. This content is for general guidance only and does not constitute tax or financial advice. Always seek professional advice before making decisions.
