Day 182 Explained: Why the Probation Start Date Matters More Than Ever

Most UK employers know the Employment Rights Act 2025 cuts the qualifying period to six months. Fewer have internalised what that means at the day level. Six months in this context is not a vague window — it's 182 calendar days from a specific date.

Which Start Date Counts

The start date of continuous employment. That's the date on the employee's contract or offer letter, not the date they did their first useful work or finished onboarding. If continuous employment includes a previous related role (e.g. a fixed-term contract that flowed into a permanent one without a real break), that earlier date can count too.

Why the Start Date Is Suddenly the Most Important Date in HR

• It's the date Day 182 is counted from.
• It's the date that determines when statutory unfair dismissal rights attach.
• It's the date the tribunal will use — not anything internal.
• It's also the date used for SSP, holiday accrual, and other statutory rights.

If the start date on the contract is wrong, every probation review date downstream is wrong too. We've seen workspaces where managers were planning a "Day 175 review" from the wrong baseline — and ended up running the review after the threshold.

How to Check the Start Date

1. Pull the signed contract. 2. Compare it to the offer letter and the right-to-work record. 3. If continuous employment includes earlier service, check that explicitly. 4. Use that date as the canonical start in your probation tracker.

ProbationWatch counts from the start date on record and sends alerts at Day 150, 165, and 175 — automatically. Start free →

What "Continuous Employment" Means

Continuous employment in the UK is technical. Breaks of less than a week, holidays, sickness, and certain statutory leave do not break continuity. Transfers under TUPE preserve continuity. Re-employment after a real break of more than a week usually does not. If continuity is unclear, get legal advice — it affects the Day 182 calculation directly.

Note: Continuity of employment is a fact-specific area of UK law. This guide is general — get legal advice on specific cases.

Frequently Asked Questions

What is Day 182 in probation? Day 182 is the 182nd calendar day from the start of continuous employment. From 1 January 2027, that's the day UK employees gain the statutory right to bring an unfair dismissal claim under the Employment Rights Act 2025.

Does the probation start date and the employment start date have to be the same? Practically yes. Probation is contractual; the statutory clock runs from the employment start date. Setting a different "probation start" doesn't change when Day 182 falls.

Are weekends included in Day 182? Yes. The 182 days are calendar days, not working days. The threshold falls on the same calendar day regardless of weekends or bank holidays.