Overstay
What is Overstay?
An overstay occurs when a traveller remains in a foreign country beyond the expiry of their authorised stay — whether that is a visa expiry date, a maximum permitted entry duration stamped at the border, or a specific departure date. Overstaying is a formal immigration violation, and consequences vary substantially by country: fines payable before departure, detention at the airport, deportation, and multi-year or permanent bans from re-entering the country are all possible outcomes.
The United States, the Schengen Area, Thailand, and Australia among others track overstays carefully and share data with other immigration authorities. The threshold can be surprisingly short: overstaying by a single day — even unintentionally due to a miscounted day allowance — constitutes a formal violation in most jurisdictions. Always verify both the visa expiry date and the permitted stay duration stamped at entry, since these are sometimes different.
Example of Overstay
Priya miscounted. She'd entered Thailand on a 30-day stamp in March, planning to leave on April 29. She left on April 30 — one day over. At the Suvarnabhumi departure desk, the immigration officer noted the overstay, charged her ฿500 (roughly £11) in overstay fines, and let her pass. "Don't do it again," the officer said. The fine was minor. The annotation in her passport file was less so: it appeared on the system whenever she returned for the following three years.