Pro Rata Pension Calculator
Calculate pension contributions for part-time work
About This Tool
The Pension Calculator helps UK employees calculate their workplace pension contributions under auto-enrolment. Since 2019, minimum contributions are 8% of qualifying earnings (5% employee, 3% employer).
This calculator shows you how much you and your employer contribute, and estimates your pension pot growth over time.
How It Works
How to Use This Calculator
- Enter your annual salary - Your gross annual salary before tax.
- Enter contribution rates - Your percentage and employer's percentage.
- Select pension type - Qualifying earnings or full salary.
- Enter your age and retirement age - To estimate pot growth.
- Click Calculate - See your contributions and projected pot.
Formula
Pension Contribution Calculation
Qualifying Earnings Method (most common):
- Lower threshold: £6,240/year
- Upper threshold: £50,270/year
- Contributions calculated on earnings between thresholds
Qualifying Earnings = Salary - £6,240 (capped at £50,270)
Your Contribution = Qualifying Earnings x Your Rate
Employer Contribution = Qualifying Earnings x Employer Rate
Minimum rates (2024): Employee 5%, Employer 3%, Total 8%
Examples
Examples
Example 1: Average Salary
- Salary: £30,000
- Qualifying earnings: £30,000 - £6,240 = £23,760
- Your contribution (5%): £1,188/year
- Employer contribution (3%): £712.80/year
- Total: £1,900.80/year
Example 2: Part-Time Worker
- Pro rata salary: £18,000
- Qualifying earnings: £18,000 - £6,240 = £11,760
- Your contribution (5%): £588/year
- Employer contribution (3%): £352.80/year
- Total: £940.80/year
Example 3: Higher Earner
- Salary: £60,000
- Qualifying earnings: £50,270 - £6,240 = £44,030 (capped)
- Your contribution (5%): £2,201.50/year
- Employer contribution (3%): £1,320.90/year
- Total: £3,522.40/year
Frequently Asked Questions
How is a pro rata pension contribution calculated?
Pro rata pension = Full Contribution × (Actual Earnings / Full-Time Equivalent Earnings). If the employer contributes 5% and you work 3 days per week earning £24,000 vs £40,000 full-time: contribution = 5% × £24,000 = £1,200/year.
Does part-time work affect my pension entitlement?
Your pension contributions are based on actual earnings, so part-time workers contribute less and accumulate a smaller pension pot. However, the percentage rate remains the same. Auto-enrolment minimum is 8% (5% employee + 3% employer).
How do I calculate pension for someone who changes hours mid-year?
Calculate each period separately. If you worked full-time for 6 months then part-time for 6 months: total contribution = (full-time salary × 6/12 × rate) + (part-time salary × 6/12 × rate). The calculator handles mid-year changes.
What is the pension lifetime allowance?
The lifetime allowance was the maximum you could accumulate in pension savings without extra tax charges. In the UK, it was £1,073,100 before being abolished in April 2024. The annual allowance of £60,000 still applies.
How does salary sacrifice affect pension contributions?
Salary sacrifice reduces your gross pay, with the difference going to your pension. You save on income tax and National Insurance. A £5,000 sacrifice at 20% tax saves £1,000 in tax plus £600 in NI, making the effective cost only £3,400.
Disclaimer
Disclaimer: This calculator provides estimates based on the information you enter and is intended for general guidance only. It does not constitute professional employment or financial advice. For specific queries about your pension contributions, workplace pension scheme, or retirement planning, please consult a qualified financial adviser or contact ACAS for employment-related queries. Pension rules and contribution rates may change; always verify current rates with official sources.
💡 Tips
Tips
- Tax relief - You get tax relief on pension contributions
- Salary sacrifice - May reduce your NI contributions
- Increase contributions - Consider contributing more than minimum
- Employer match - Some employers match higher contributions
- Review annually - Check your pension statement each year