The usual rule
Acas states that in most cases you have 3 months minus 1 day from the date the problem at work happened. GOV.UK explains that the period is put on hold while Acas helps resolve the dispute.
Dates you need
You need the dismissal date or act date, the date you notified Acas, the date the Acas certificate was issued and any continuing act arguments.
Urgent warning
If you are close to the deadline, do not wait for perfect advice. Get the date checked immediately and preserve your position.
Deadline calculation warning
The usual 3 months less 1 day rule sounds simple, but Acas early conciliation can alter the final date. Multiple incidents, continuing acts, dismissal dates and certificate dates can make the answer less obvious.
Information needed for a deadline review
You need the act or dismissal date, Acas notification date, Acas certificate date, whether the same respondent was named correctly and whether there are multiple claims with different dates.
What to do if close to time
If the deadline is close, prioritise preserving the claim. Do not spend days perfecting evidence while the filing window expires. Get the ET1 route checked urgently.