The dates that matter in a commercial lease
- Lease expiry — the last day of the term (term years from commencement, less one day).
- Lock-in end — the earliest date you can leave without paying for the rest of the lock-in.
- Notice deadlines — notice has to reach the other side a set number of months before you leave or before expiry.
- Escalation dates — usually counted from the rent commencement date, every one or three years.
The calculator counts notice as "on or before this date": a 3-month notice to leave on 31 March must be served by 31 December. Leases word this differently — some require notice to be received by then, or count from the month-end — so check your lease and leave a margin.
Download the dates as a calendar file and add them to Google Calendar or Outlook so nothing slips.
Frequently asked questions
How is the lease expiry date calculated?
Add the lease term to the commencement date and subtract one day — a 9-year lease starting 1 April 2026 ends on 31 March 2035.
When should I serve notice to leave at the end of the lock-in?
At least the notice period before the lock-in ends. With a 3-month notice and a lock-in ending 31 March, serve notice by 31 December — earlier if your lease requires the notice to be received by then.
Does the lock-in start from the lease date or the rent date?
It depends on the lease. Choose either option in the calculator to see both results.
Alerts for every critical date
LeaseHub360 tracks expiry, lock-in, notice and escalation dates across all your leases and reminds your team in time.