You should try not to overstay your visa under any circumstances! If you do overstay, the consequences can be drastic. A few countries may let you just pay a fine at the border, however this is often very expensive, can cause significant delays to your travel, and should not be relied on as an alternative. Some countries will choose to deport you, or even have you arrested. If deportation does occur, it will have an impact on your future travels not only to that country (you’re likely to be banned for a period!) but to other countries as well.
Most visa application forms have a question on them about deportation, and if the answer is ‘yes’, your visa may be rejected. The USA, for instance, won’t issue you with an ESTA (electronic travel authority) and you will have to apply for an actual tourist visa in person at the US embassy – a process which is more lengthy and complicated, and rejections are common.
If it looks like overstaying is inevitable due to serious circumstances, you will need to report it to the police or local immigration authority for further assistance. You may wish to contact your own embassy too.
In short, do not overstay your visa!
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