Free tool · Lease notice dates
Lease notice date calculator: latest date by your count.
Many leases say a notice must be given “at least 90 days before” a date, or “not less than twelve months before” it. Enter that date and that period, and this page counts back and shows each step, so you can check the arithmetic against the clause. It runs in your browser, needs no sign-up, and nothing you type into this calculator is sent.
Work out the date
Enter the date, the notice period, its unit and how the lease counts it to see the latest date by this count.
Arithmetic on what you typed. Your lease's notice and service clauses decide the real deadline; if unsure, serve earlier, but never before the first date the lease allows notice.
Nothing you type into this calculator is sent. Everything you enter stays in your browser: the calculation runs on this page, and the dates and numbers are not sent to us or stored. The page records the visit (which page it was and when, a random visitor id in a first-party cookie, the site or campaign you came from, whether you arrived through an ad click, and a mark saying whether the visit looked automated or came from our own team), where on the page you were when the visit began, whether you are still on the page after about five seconds and how far down you have scrolled by then, and any click on a button that leads to uploading a document ("Read my own lease", "Add a contract" in the header, or the bar at the foot of a phone screen), with which button it was (see Privacy). Nothing you type into this calculator is included. These records do not include your IP address or the name of your browser. The upload form at the foot of the page is separate. It records the kind of file you choose and a size band, never its name or contents, and that an account was made from it or an upload was started, finished or stopped (with which step and a short reason). The file and any email address you put in it are sent only when you submit it.
How the date is worked out
latest date by this count = date the notice is counted from - notice period
with clear days, one more day: latest date by this count = date the notice is counted from - notice period - 1 day
send-by date = latest date by this count - days you allow for delivery- Days are counted back as calendar days.
- A week is seven days.
- Months are calendar months, counted the way a spreadsheet’s EDATE counts them: the same day of the month, that many months earlier.
- Where that month is too short for the day, its last day is used. Six months before 31 August 2027 is Sunday 28 February 2027, because February has no 31st.
- A date is a calendar date, not a moment: 2030-06-30 is the same day wherever you are, with no time-zone or clock-change drift.
Worked example
An example, not your lease: a term ending on 30 June 2030, a notice due at least 12 months before it, and 3 days allowed for delivery. Each line below is the calculator's own output for those numbers.
| Step | Date |
|---|---|
| Counted from | Sunday 30 June 2030 |
| Latest date by this count | Saturday 30 June 2029 |
| Send it by, allowing 3 days | Wednesday 27 June 2029 |
- Count from Sunday 30 June 2030.
- Go back 12 calendar months: Saturday 30 June 2029.
- Latest date by this count: Saturday 30 June 2029.
- Allow 3 days for delivery, as you entered: go back 3 days to Wednesday 27 June 2029. That is the day to send or hand over the notice on this count.
The latest date in this example is a Saturday. The calculator flags it and does not move it: whether a weekend moves a deadline is for the lease to say.
Check these in your lease before you rely on the date
The date the period is counted from
A lease end, an option expiry or a break date. Use the date the clause names. If that date is itself worked out from a formula or changed by an amendment, work it out first.
Whether there is an earliest date as well
Many option clauses give a window: not earlier than one period before a date, and not later than another. This calculator gives the later end. For the earlier end, run it again with the longer period: that run’s result is the first day a notice may be given, although its heading still reads "Latest date by this count".
How the period is counted
Whether the day the notice is given counts, whether the date itself counts, and whether the lease calls the period "clear". The choice above follows what you select; it does not decide for you.
How and where the notice must be given
In writing, to a named person or address, by a named method, signed by a named party. A notice that is on time but given the wrong way may not count.
What happens if it is late
Treat the last day as final. Do not assume a late notice will be accepted because the lease does not say time is of the essence. Whether a late notice can be rescued depends on the lease and the law where the property is.
Conditions on the right
No default, rent paid up, vacant possession: conditions the lease may attach to the right you are giving notice under.
What it will not do
This calculator does not know your lease. It counts what you type. It does not apply any rule about when a notice is treated as given, does not count business days, has no holiday calendar and does not move a date that falls on a weekend; it only tells you when a date is a Saturday or a Sunday. Your lease's own notice and service clauses control, along with any conditions on the right you are giving notice under. It is not legal advice.
Questions
How do you work out a notice deadline?
Take the date the notice is counted from and go back by the notice period. The result is the latest day to give it on that count; a lease can count differently. For "at least 90 days before 30 June 2030" that is 1 April 2030. For months, count calendar months back, and where the month is too short for the day, use its last day.
What if the date falls on a weekend or a holiday?
Some leases move a deadline that lands on a weekend or a holiday to another day, and some do not. This calculator tells you when a date is a Saturday or a Sunday and does not move it. It has no holiday calendar. Read what your lease says.
What does "days to allow for delivery" do?
It moves the send-by date earlier by the number of days you type, to leave room for your way of delivering the notice. It is your own allowance, not a rule: the lease’s notice and service clauses say when a notice counts as given, and where they are silent, the law on service does. This page knows neither.
What is the difference between the two ways of counting?
With "at least this long before the date", the latest day is exactly the period back from the date. With clear days, neither the day the notice is given nor the date itself counts, so it is one day earlier. Which one a lease means is a matter of its wording. If it is not clear, ask a lawyer, or work to the earlier date, but never before the first date the lease allows notice.
Does it count business days?
No. It counts calendar days, weeks and months, and nothing else. If your lease counts business days or working days, do not use this result: count the days by hand against the lease, and check how it treats weekends and holidays.
Is anything I type sent to you or saved?
No. Nothing you type into this calculator is sent to us or stored: the calculation runs in your browser, on this page, and there is nothing to sign up for. The page does record the visit (which page it was and when, a random visitor id in a first-party cookie, the site or campaign you came from, whether you arrived through an ad click, and a mark saying whether the visit looked automated or came from our own team), where on the page you were when the visit began, whether you are still on the page after about five seconds and how far down you have scrolled by then, and any click on a button that leads to uploading a document ("Read my own lease", "Add a contract" in the header, or the bar at the foot of a phone screen), with which button it was (see the Privacy page). Nothing you type into this calculator is included. These records do not include your IP address or the name of your browser. The upload form at the foot of the page is separate. It records the kind of file you choose and a size band, never its name or contents, and that an account was made from it or an upload was started, finished or stopped (with which step and a short reason). The file and any email address you put in it are sent only when you submit it.
Is this legal advice?
No. It is arithmetic on the numbers you type. It does not know your lease, and it applies no rule about service, business days or holidays. Before you rely on a date, read the clause in your lease that sets it and, for a lease that matters, ask a lawyer.
Read more
The guide to lease renewal notice deadlines shows how a notice window is read from a lease. If you are a tenant with an option to renew, see the tenant’s notice; from the landlord’s side, the option to renew guide for landlords.
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Try Prism on your own lease.
Prism reads a lease and lists the notice windows, options and rent steps it finds, each with the clause it came from, where one was captured. It can miss a date, so check the list against your lease. How often it finds them is on the accuracy page.
Read my own lease