Maternity Leave Pay Calculator UK
Estimate your Statutory Maternity Pay based on your average weekly earnings, number of paid weeks, and optional tax and National Insurance assumptions.
Your estimate will appear here
Enter your details and click Calculate Maternity Pay.
Expert Guide: How to Use a Maternity Leave Pay Calculator in the UK
If you are planning time off for a new baby, one of the most important parts of financial preparation is understanding what your maternity pay might look like week by week. A maternity leave pay calculator for the UK helps you estimate your expected income during leave, build a practical budget, and reduce stress before your leave starts. This guide explains the legal basics, the pay formula, common mistakes, and a realistic planning approach you can use with your partner or household.
In the UK, maternity leave and maternity pay are linked but not identical. Eligible employees can usually take up to 52 weeks of maternity leave, split into Ordinary Maternity Leave (first 26 weeks) and Additional Maternity Leave (second 26 weeks). Statutory Maternity Pay, however, is usually paid for up to 39 weeks. That difference matters for budgeting because your final 13 weeks are often unpaid unless your employer offers enhanced benefits.
How Statutory Maternity Pay is calculated
The standard Statutory Maternity Pay structure is:
- First 6 weeks: 90% of your average weekly earnings (before tax).
- Next 33 weeks: the lower of either the standard statutory weekly rate or 90% of your average weekly earnings.
- Final 13 weeks of leave: usually unpaid, unless an employer policy says otherwise.
Your average weekly earnings are normally calculated over a fixed period set by payroll rules, so your own payslips are the most reliable source. A calculator is useful because it lets you test multiple scenarios quickly, such as changing your number of paid weeks, adjusting for different tax assumptions, or comparing outcomes at different earning levels.
Current legal framework and official sources
Use official guidance for final confirmation of entitlement and rates, because statutory rates can change each tax year. Start with these government references:
- GOV.UK: Maternity pay and leave
- GOV.UK: Employer guidance for maternity pay and leave
- ONS earnings and labour market data
| Tax year | Standard Statutory Maternity Pay weekly rate | Key statutory payment rule |
|---|---|---|
| 2021/22 | £151.97 | Weeks 1 to 6 at 90% average weekly earnings, weeks 7 to 39 at lower of 90% or standard rate |
| 2022/23 | £156.66 | Same structure, with updated annual statutory rate |
| 2023/24 | £172.48 | Same structure, rate increased from prior tax year |
| 2024/25 | £184.03 | Same structure, rate increased again |
| 2025/26 | £187.18 | Same structure, check latest GOV.UK page for effective date and payroll application |
Rates shown are standard published statutory weekly SMP figures by tax year. Always verify the live rate on GOV.UK before final decisions.
Eligibility checkpoints you should verify early
A calculator gives an estimate, but entitlement still depends on legal criteria. Most people should check these points as early as possible:
- Are you classed as an employee for SMP purposes?
- Have you worked continuously for your employer for the required period before the qualifying week?
- Do your earnings meet the relevant threshold for SMP?
- Did you notify your employer by the required deadline and provide MATB1 documentation?
Even if you are not eligible for SMP, you may still qualify for Maternity Allowance through a different route. This is exactly why a calculator is useful in planning conversations, because you can compare best case and conservative scenarios before your leave begins.
Why weekly cash flow matters more than total headline pay
Many households focus only on total expected maternity pay for the full paid period, but that can hide short term pressure points. Weekly payment can drop after week 6. If your regular bills are fixed, the week 7 transition can feel abrupt unless you plan in advance. It is better to map your income across weeks and months, then align your fixed costs, variable spending, and emergency savings to that profile.
This calculator includes a chart for that reason. A visual schedule helps you spot when your cash flow changes and where you may want to build a buffer. For example, if your rent, childcare deposits for an older child, loan repayments, and utility costs already consume most of your reduced income, you can make adjustments early rather than reacting during leave.
Worked examples to understand the formula quickly
Suppose your average weekly earnings are £500. In the first 6 weeks, your SMP estimate is 90%, which is £450 per week. For weeks 7 to 39, the payment is capped to the lower of 90% of earnings (£450) or the standard rate (for example £184.03), so the statutory amount becomes £184.03 per week in that period.
If your earnings are lower, say £180 average weekly earnings, then 90% is £162. In weeks 7 to 39, the lower of £162 and £184.03 is £162, so your payment remains at £162. This is a key detail that calculators handle instantly and accurately.
| Average weekly earnings | Weeks 1 to 6 (90%) | Weeks 7 to 39 (lower rule) | Total estimated SMP over 39 weeks (using £184.03 rate) |
|---|---|---|---|
| £180 | £162.00 per week | £162.00 per week | £6,318.00 |
| £300 | £270.00 per week | £184.03 per week | £7,693. – approx £7,693. – rounded in payroll may vary |
| £500 | £450.00 per week | £184.03 per week | £8,773. – approx £8,773. – rounded in payroll may vary |
Example totals are illustrative and may differ slightly due to payroll rounding, tax code, National Insurance treatment, salary sacrifice arrangements, or employer enhancements.
Enhanced maternity pay versus statutory pay
Some employers offer enhanced maternity packages, such as full pay for a number of weeks, then half pay plus SMP, before moving to statutory only. This can significantly increase total paid income compared with statutory baseline alone. However, enhanced schemes often come with terms, such as a requirement to return to work for a minimum period after leave or repay part of the enhanced element.
When reading your contract or policy, look for:
- How many weeks are paid at full salary.
- Whether enhanced pay includes SMP or is paid on top of SMP.
- Any repayment clause if you do not return or leave soon after returning.
- How pension contributions and salary sacrifice are treated during leave.
Tax and National Insurance during maternity pay
Maternity pay is usually taxable, and National Insurance can still apply depending on your weekly amount and payroll setup. For planning, many calculators include a simple deduction estimate. This is not a replacement for payroll or HMRC figures, but it helps produce a conservative net income range. If you want high accuracy, ask payroll for an expected net pay schedule by month for your planned leave dates.
Because tax is calculated over pay periods, your monthly net can vary. One month may include more days at the higher early leave rate, and another month may be mostly at the lower statutory rate. That variation is normal and should be built into your budget model.
Practical planning checklist before leave starts
- Run at least three scenarios: optimistic, expected, and conservative.
- Separate fixed bills from discretionary spending in your monthly budget.
- Build a leave buffer that covers at least one month of essential costs.
- Confirm all dates in writing with HR and payroll.
- Check annual leave interaction, because holiday usually continues to accrue while on maternity leave.
- Review childcare and return-to-work plans early, including waiting lists and deposit timing.
Common mistakes people make with maternity pay estimates
- Assuming all 52 weeks are paid at the same level.
- Using current salary instead of average weekly earnings from the qualifying period.
- Ignoring the week 7 drop in income.
- Forgetting that tax and NI reduce take home pay.
- Not checking whether employer enhancement has return-to-work conditions.
- Planning only for maternity leave, not for the transition back to work costs.
How this calculator should be used
Use this calculator as a planning tool, not a legal determination tool. It applies the standard SMP formula, gives a weekly to monthly style view, and plots your payment profile across paid weeks. That makes it useful for household forecasting, savings targets, and timing discussions with your employer. For final entitlement and precise payroll outcomes, always confirm with HR and official guidance.
Good planning can make maternity leave materially less stressful. If you know in advance when income changes, you can adapt spending, automate savings, and avoid expensive short term borrowing. Pair this calculator with your real payslips, policy documents, and official UK guidance links above to create the most reliable plan.
Final takeaway
A high quality maternity leave pay calculator for the UK does three things well: it applies statutory rules correctly, shows timing of income changes clearly, and helps you compare scenarios quickly. Those three features turn a confusing entitlement question into a practical financial plan. If you are a few months away from leave, now is the right time to model your numbers and turn estimates into decisions.