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Maternity Leave Planner & Key Dates Calculator UK

Calculate maternity leave start dates, qualifying weeks, and 52-week statutory timelines.

Statutory Maternity Pay (SMP) Details

Average Weekly Earnings (AWE in 8-Week Qualifying Window £)
£
Total Statutory Maternity Leave Duration
Total Statutory Maternity Pay (SMP) Entitlement
£7,654.40
First 6 Weeks 90% Rate: £585.00 / week

📊 Statutory Maternity Pay Breakdown

First 6 Weeks (90% Average Weekly Earnings) £3,510.00 (£585.00/wk)
Next 33 Weeks (Statutory Rate £184.03/wk) £6,072.99 (£184.03/wk)
Remaining Weeks (Unpaid Additional Maternity Leave) 13 Weeks (£0.00)
Total Statutory SMP Paid Across Leave £9,582.99

Planning maternity leave requires managing crucial statutory deadlines set by UK employment law. All eligible pregnant employees in the UK have the statutory right to 52 weeks of Statutory Maternity Leave.

Understanding key milestones—such as your 15th week notice deadline and early leave triggers—ensures you protect your employment rights while preparing for baby’s arrival.

⚙️ Statutory Maternity Leave Structure & Milestones

1. 52-Week Leave Division

Maternity leave is divided into two 26-week blocks:

  • Ordinary Maternity Leave (OML): First 26 weeks.
  • Additional Maternity Leave (AML): Subsequent 26 weeks.
  • Compulsory Leave: You must take at least 2 weeks of leave immediately after the birth (or 4 weeks if you work in a factory).

2. Key Statutory Timelines

  • Earliest Leave Start: You can choose to start your maternity leave up to 11 weeks before your expected week of childbirth (EWC).
  • 15th Week Qualifying Deadline: By the 15th week before your due date, you must formally notify your employer in writing of your pregnancy, your due date, and your planned leave start date.
  • Premature Birth / Sickness Triggers: If your baby is born early or if you are off work with a pregnancy-related illness in the 4 weeks before your due week, your maternity leave starts automatically on the next day.

📊 Practical Maternity Leave Planning Examples

Below are two worked planning examples illustrating key statutory milestone dates:

Example 1: Expected Due Date: 12 October 2026 (Starting leave 2 weeks early)
  • 15th Week Notice Deadline: **29 June 2026**
  • Planned Leave Start Date: **28 September 2026** (2 weeks before due date)
  • 39-Week Paid Leave End: **28 June 2027**

Timeline: 39 weeks of Statutory Maternity Pay followed by 13 weeks of unpaid Additional Maternity Leave.

Full 52-Week Leave Ends: **27 September 2027**
Example 2: Expected Due Date: 12 October 2026 (Starting leave 11 weeks early max)
  • 15th Week Notice Deadline: **29 June 2026**
  • Earliest Allowed Start Date: **27 July 2026** (11 weeks before due date)
  • 39-Week Paid Leave End: **26 April 2027**

Timeline: Starting 11 weeks early provides rest before birth, with paid leave completing in late spring.

Full 52-Week Leave Ends: **26 July 2027**

📑 Common Pitfalls & Employee Warnings

  1. Missing the 15th Week Statutory Notice Deadline: Failing to notify your employer in writing by the 15th week before your due week can delay your statutory rights and SMP payments.
  2. Forgetting Holiday Accrual During Leave: You continue to accrue full paid annual leave (including bank holidays) throughout all 52 weeks of maternity leave. Many employees add accrued holiday onto the beginning or end of their leave.
  3. Triggering Leave Early via Sick Leave: If you take pregnancy-related sick leave during the final 4 weeks before your due date, your employer is legally required to start your maternity leave automatically.

❓ Frequently Asked Questions (FAQ)

During paid maternity leave (the first 39 weeks), your employer must continue paying full employer pension contributions based on your normal unreduced salary, even though your own contributions are based on your reduced SMP amount.

Yes. If you wish to return to work earlier or later than originally planned, you must give your employer at least 8 weeks' written notice before your new return date.

If you take 26 weeks or less (Ordinary Maternity Leave), you have the absolute legal right to return to the exact same job. If you take up to 52 weeks (Additional Maternity Leave), you have the right to return to the same job unless it is not reasonably practicable, in which case a suitable alternative position with equal pay must be offered.

You can work up to 10 KIT days during your maternity leave without ending your leave or losing SMP. You and your employer must mutually agree on KIT days, and pay for KIT days is negotiated between you and your employer.