Used to state the final deadline by which something must happen, meaning it cannot happen after that time.
“Applications must be received no later than the 15th of each month.”
“Payment is due no later than 30 days after the invoice date.”
Deadlines in diagrams are often phrased this way (e.g., 'submit no later than June 1st'). Treat the given date as the last acceptable point in time, meaning submitting exactly on that date is still on time. This phrase is frequently tested against scenarios that arrive right at, before, or after the deadline.
Synonyms: by, at the latest, on or before