In Reply to: Visa extension payment posted by baliedge on Friday, 16. July 2010 at 14:48 Bali Time:
On a VOA if you overstay it's about a 20-25USD charge per day for overstay.
If you want to extend your VOA for another 30days it's best to do it about a week before your time is up.
On a tourist visa/social visa if you don't pay/extend by the appropriate date per month then you are no longer legally allowed to stay.
Visa has expired
I guess once you do leave then it can be either/both a big fine, imprisonment (according to some sites)blacklisted etc..