What should I do if my visa has expired by one day in Thailand?

The user expressed concern regarding being one day over their visa expiration and sought advice on potential consequences and actions to take. Contributors advised that if the overstay is less than 90 days, it is generally manageable. The user should visit the immigration office promptly to pay a fine of 500 THB for each day overstay (totaling 500 THB), and they could apply for a 30-day extension for 1,900 THB. If they are unable to extend their visa, making a border run was suggested as an alternative solution. The type of visa held (in this case, an entry visa or exempt entry) was critical in determining the appropriate course of action.