SMP Calculator (Statutory Maternity Pay)
Accurately estimate your 39-week maternity pay entitlement based on UK government rules.
Calculate Your Entitlement
Enter your average gross weekly earnings over the 8-week relevant period before the qualifying week.
What is an SMP Calculator?
An smp calculator (Statutory Maternity Pay calculator) is a specialized digital tool designed for expectant parents in the UK to estimate their statutory maternity pay entitlement. Statutory Maternity Pay (SMP) is a government-mandated benefit paid by employers to eligible employees who are taking time off work to have a baby. This financial support is provided for up to 39 weeks. Our smp calculator simplifies the complex calculation process, providing a clear forecast of the payments you can expect during your maternity leave.
This tool is crucial for anyone planning their finances for maternity leave. It takes into account the two-tiered payment system: an initial higher rate for the first six weeks, followed by a standard rate for the subsequent 33 weeks. Common misconceptions are that SMP is a fixed amount for everyone or that it’s paid by the government directly; in reality, it’s earnings-dependent and administered through the employer’s payroll, though employers can reclaim most or all of it. Using an smp calculator helps clarify these details.
SMP Calculator Formula and Mathematical Explanation
The calculation for Statutory Maternity Pay is split into two distinct phases. Our smp calculator automates this, but understanding the formula is key to financial planning.
- Weeks 1-6: The payment is 90% of your Average Weekly Earnings (AWE). There is no upper limit for this period.
-
Weeks 7-39: The payment is the lower of two amounts:
- The standard statutory weekly rate (currently £172.48 for 2023/24, but this tool uses the 2025/26 rate of £187.18 for future planning).
- 90% of your Average Weekly Earnings (AWE).
The total SMP is the sum of the amounts from these two periods. This smp calculator breaks down each component for full transparency. For more details on your specific leave, see our parental leave planner.
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| AWE | Average Weekly Earnings (Gross) | Pounds (£) | £123+ (to meet Lower Earnings Limit) |
| SMP Rate | Standard Statutory Weekly Rate | Pounds (£) | £187.18 (for 2025/26 tax year) |
| SMP Period 1 | First 6 weeks of maternity pay | Weeks | Fixed at 6 weeks |
| SMP Period 2 | Remaining 33 weeks of maternity pay | Weeks | Fixed at 33 weeks |
Practical Examples (Real-World Use Cases)
Example 1: Higher Earner
An employee has an Average Weekly Earning (AWE) of £600. Using the smp calculator:
- Weeks 1-6 Pay: 90% of £600 = £540 per week. Total = £3,240.
- Weeks 7-39 Pay: 90% of her AWE is £540. This is higher than the statutory rate of £187.18. Therefore, she receives the lower amount. Payment is £187.18 per week for 33 weeks. Total = £6,176.94.
- Total SMP: £3,240 + £6,176.94 = £9,416.94.
Example 2: Lower Earner
An employee has an AWE of £180. The smp calculator would determine:
- Weeks 1-6 Pay: 90% of £180 = £162 per week. Total = £972.
- Weeks 7-39 Pay: 90% of her AWE is £162. This is lower than the statutory rate of £187.18. Therefore, she receives her earnings-based rate. Payment is £162 per week for 33 weeks. Total = £5,346.
- Total SMP: £972 + £5,346 = £6,318.
These scenarios show how vital an accurate smp calculator is for predicting income. Consider exploring our budget planning tool to manage these figures.
How to Use This SMP Calculator
Our smp calculator is designed for simplicity and accuracy. Follow these steps to get your personalized estimate:
- Enter Average Weekly Earnings: Input your gross average weekly earnings into the designated field. This is the most critical factor for the calculation. Your AWE is typically calculated over an 8-week period before your qualifying week.
- Review Real-Time Results: The calculator instantly updates your estimated total SMP, the breakdown for the first 6 weeks, and the subsequent 33 weeks. No need to press a ‘calculate’ button.
- Analyze the Breakdown: The chart and table provide a week-by-week visualization of your payment schedule, helping you understand when your income will change.
- Use the Controls: The ‘Reset’ button clears the input for a new calculation. The ‘Copy Results’ button allows you to save a summary of your entitlements for your personal records or financial planning with a financial advisor.
Reading the results from this smp calculator helps you make informed decisions about your budget during leave, such as when to start your maternity leave and how to manage the drop in income after the first six weeks.
Key Factors That Affect SMP Calculator Results
Several factors can influence the output of an smp calculator. Understanding them is essential for accurate financial planning.
- Average Weekly Earnings (AWE): This is the single most important factor. Your AWE directly determines the amount you receive in the first 6 weeks and sets the ceiling for the remaining 33 weeks if it’s below the statutory rate.
- Length of Service: To qualify for SMP, you must have been continuously employed by your employer for at least 26 weeks up to the ‘qualifying week’ (the 15th week before the expected week of childbirth).
- Government Statutory Rate: The weekly rate for weeks 7-39 is set by the government annually. Any changes will affect the total amount for that period. Our smp calculator is updated with the latest rates.
- Pay Rises: A pay rise that takes effect during the relevant calculation period can increase your AWE, thereby increasing your SMP.
- Bonuses and Overtime: If you receive bonuses or regular overtime during the 8-week AWE calculation period, this can significantly boost your SMP entitlement. The timing of these payments is critical.
- Contractual Maternity Pay: Many employers offer an enhanced or contractual maternity pay scheme which is more generous than SMP. Our smp calculator only computes the statutory minimum; you should check your employment contract for any enhanced benefits. Our salary comparison tool can help you evaluate offers.
Frequently Asked Questions (FAQ)
1. Do I have to pay tax and National Insurance on SMP?
Yes, Statutory Maternity Pay is treated as normal earnings, so your employer will deduct tax and National Insurance contributions through PAYE before you receive it. The amount shown on any smp calculator is the gross figure before deductions.
2. What happens if I don’t qualify for SMP?
If you don’t meet the eligibility criteria for SMP (e.g., due to insufficient length of service or earnings), you may be eligible for Maternity Allowance (MA) instead. This is paid directly by the government via Jobcentre Plus.
3. Can I work while receiving SMP?
You are allowed up to 10 ‘Keeping in Touch’ (KIT) days, where you can work for your employer without losing your SMP for that week. Any work beyond this will affect your entitlement. A good smp calculator assumes you are not working.
4. What is the ‘qualifying week’?
The qualifying week is the 15th week before your baby’s expected due date. Your employment service and earnings are assessed based on this week.
5. Does the smp calculator account for twins or multiple births?
Yes, the amount of SMP is the same regardless of whether you have one baby or a multiple birth. The calculation is per employee, not per child.
6. What is the minimum I need to earn to get SMP?
Your Average Weekly Earnings (AWE) must be at least the Lower Earnings Limit (LEL) for National Insurance contributions, which is £123 per week for the 2024/25 tax year.
7. How is ‘Average Weekly Earnings’ actually calculated?
It’s your gross earnings during a specific ‘relevant period’, which is usually the 8 weeks before the end of your qualifying week. Our smp calculator relies on you providing this figure. For precise dates, use a date calculation tool.
8. Will using an smp calculator guarantee my payment?
No, an smp calculator provides a reliable estimate based on the information you enter. Your employer’s payroll department will make the final, official calculation. Always confirm the final figures with them.