Salary Sacrifice Calculator
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With Salary Sacrifice
Your Annual Savings
How Salary Sacrifice Works
Salary sacrifice is an arrangement between you and your employer where you agree to give up part of your gross salary in exchange for a non-cash benefit, typically pension contributions [web:1]. This arrangement reduces both your taxable income and National Insurance contributions, creating savings for both you and your employer [web:5].
Two Types of Salary Sacrifice
Simple Salary Sacrifice: You sacrifice a fixed amount of your salary which goes directly into your pension. The National Insurance savings you make appear in your take-home pay, effectively increasing your monthly income whilst maintaining the same pension contribution [web:6].
SMART Salary Sacrifice (Save More And Reduce Tax): Your take-home pay remains the same, but the National Insurance savings you make go directly into your pension instead. Your employer may also choose to contribute their NI savings to your pension, though this is not mandatory [web:9].
Key Benefits
- Reduced National Insurance contributions for both employee and employer
- Increased pension contributions at no additional cost
- Potential for higher take-home pay (simple sacrifice)
- Employer NI savings can boost your pension further
- Tax-efficient way to save for retirement
Current UK Tax Rates (2025/26)
| Income Band | Tax Rate | Employee NI Rate |
|---|---|---|
| £0 – £12,570 | 0% (Personal Allowance) | 0% |
| £12,571 – £50,270 | 20% | 8% |
| £50,271 – £125,140 | 40% | 2% |
| Over £125,140 | 45% | 2% |
Employer National Insurance is charged at 13.8% on earnings above £9,100 per year [web:13]. These rates apply to England, Wales, and Northern Ireland. Scotland has different income tax bands.
Step-by-Step Guide
1. Enter Your Details
Input your annual gross salary and choose whether you want to contribute a percentage of your salary or a fixed amount. Typical workplace pensions require a minimum 5% employee contribution.
2. Choose Your Sacrifice Type
Decide between Simple (increases take-home pay) or SMART (increases pension contributions). Consider your current financial priorities when making this choice.
3. Check Employer Contribution
Verify with your employer what percentage they contribute and whether they share their NI savings with you. Many employers contribute 3% as a minimum under auto-enrolment rules.
4. Review Your Results
Compare the scenarios to see how much you save in National Insurance and how your pension pot or take-home pay increases. Use these figures to make an informed decision.
5. Speak to Your Employer
Not all employers offer salary sacrifice schemes. Contact your HR department or payroll team to discuss whether this option is available and how to enrol.
Frequently Asked Questions
Can salary sacrifice take me below minimum wage?
No. Employers cannot offer salary sacrifice if it would reduce your earnings below the National Minimum Wage or National Living Wage. This is a legal requirement to protect workers [web:1].
Will salary sacrifice affect my mortgage application?
Potentially yes. Since salary sacrifice reduces your gross salary on paper, some mortgage lenders may consider your lower post-sacrifice salary when assessing affordability. However, many lenders now recognise salary sacrifice arrangements and may consider your pre-sacrifice salary [web:12].
Can I change my salary sacrifice amount?
This depends on your employer’s scheme rules. Most schemes allow annual changes, often aligned with your company’s pension renewal date or annual salary reviews. Some employers may permit changes following significant life events.
What happens to salary sacrifice in 2029?
From April 2029, only the first £2,000 of annual employee pension contributions through salary sacrifice will be exempt from National Insurance. Amounts above this will be subject to standard NI rates, reducing the benefit for higher earners [web:6][web:11].
Does salary sacrifice affect my State Pension?
No. Your State Pension entitlement is based on your National Insurance record, not the amount you pay. As long as you earn above the Lower Earnings Limit (£6,396 for 2025/26), you’ll continue building State Pension entitlement regardless of salary sacrifice.
Can I use salary sacrifice if I’m a higher-rate taxpayer?
Yes, but the NI savings are smaller (2% instead of 8%) once you earn over £50,270. However, you still benefit from income tax relief at 40%, making pension contributions highly tax-efficient for higher earners [web:10].
What’s the maximum I can contribute through salary sacrifice?
Currently, there’s no specific limit on salary sacrifice amounts, but total pension contributions are subject to the Annual Allowance (£60,000 for 2025/26) and must not reduce your salary below minimum wage. The tapered allowance applies to high earners with income over £200,000 [web:1].
Is salary sacrifice the same as pension tax relief?
No. Salary sacrifice reduces your gross salary before tax and NI are calculated, whilst standard pension tax relief reclaims tax already paid. Salary sacrifice typically provides greater savings because you also save on National Insurance contributions [web:9].
Comparison: Net Pay vs Relief at Source vs Salary Sacrifice
| Feature | Net Pay | Relief at Source | Salary Sacrifice |
|---|---|---|---|
| When contribution taken | Before tax, after NI | After tax and NI | Before tax and NI |
| Income tax relief | Automatic | 20% added by provider | Automatic |
| NI savings | No | No | Yes |
| Higher-rate relief | Automatic | Claim via tax return | Automatic |
| Employer NI saving | No | No | Yes (may be shared) |
| Best for | Basic-rate employees | Low earners, non-taxpayers | All employees (if offered) |
Scenarios Showing Different Outcomes
Scenario 1: Basic-Rate Taxpayer (£30,000 salary)
Sarah earns £30,000 and contributes 5% (£1,500) to her pension. Without salary sacrifice, she pays £240 in NI on this amount (8% of £3,000 above the threshold). With salary sacrifice, she saves this £240 annually. If her employer shares their NI saving of £207, her pension receives an extra £447 per year at no cost.
Scenario 2: Higher-Rate Taxpayer (£60,000 salary)
James earns £60,000 and contributes £6,000 through salary sacrifice. He saves approximately £120 in employee NI (2% rate applies at this income). His employer saves £828 in NI. If the employer contributes half of their saving, James’s pension receives an extra £414 annually, plus his £120 saving.
Scenario 3: Large Contribution Pre-2029 Change
Emma earns £80,000 and sacrifices £12,000 annually. Currently, she saves £240 in NI. From April 2029, only £2,000 will be NI-free, so she’ll pay NI on £10,000, costing her £200 extra annually (2% × £10,000). Her employer will pay £1,380 extra in NI (13.8% × £10,000) [web:8].
Common Mistakes to Avoid
1. Sacrificing Too Much
Don’t sacrifice so much that you struggle to meet daily expenses. Pension savings are typically locked until age 55 (rising to 57 in 2028). Maintain adequate emergency savings outside your pension.
2. Ignoring Other Benefits
Salary sacrifice reduces your gross salary, which might affect other salary-linked benefits such as life insurance multiples, death-in-service benefits, or redundancy payments. Check your employment contract.
3. Not Reviewing Annually
Your financial circumstances change. Review your salary sacrifice arrangement annually to confirm it still meets your needs, especially with the 2029 changes approaching.
4. Assuming All Schemes Are Equal
Employer schemes vary significantly. Some share NI savings, others don’t. Some allow flexible changes, others are rigid. Always clarify the specific terms of your employer’s scheme.
5. Forgetting About the Annual Allowance
Total pension contributions (including employer contributions and any NI savings added to your pot) count towards your £60,000 Annual Allowance. Exceeding this triggers tax charges.
References
- Legal & General (2025). Salary Sacrifice Calculator – Workplace Pensions. Available at: https://www.legalandgeneral.com/retirement/pensions/workplace-pensions/calculators-and-tools/salary-sacrifice-calculator/
- HM Government (2025). Changes to Salary Sacrifice for Pensions from April 2029. Available at: https://www.gov.uk/government/publications/changes-to-salary-sacrifice-for-pensions-from-april-2029
- HM Government (2025). Rates and Thresholds for Employers 2025 to 2026. Available at: https://www.gov.uk/guidance/rates-and-thresholds-for-employers-2025-to-2026
- BBC News (2025). Salary Sacrifice: Pension Tax Break Reduced by Chancellor. Available at: https://www.bbc.com/news/articles/cd9zx8z5d1no
- Evelyn Partners (2015). Salary Sacrifice for Pensions Explained. Available at: https://www.evelyn.com/insights-and-events/insights/salary-sacrifice-for-pensions-explained/
- FreshBooks (2024). Income Tax Threshold, Rates, and Allowances for 2025-26. Available at: https://www.freshbooks.com/en-gb/hub/taxes/uk-tax-threshold