What paperwork is required to extend a non-B visa for teaching in Chiang Mai for an additional 12 months?

To extend a NON-B visa for teaching in Chiang Mai for an additional 12 months, you will need to provide several documents including your work permit, proof of company certification, as well as evidence of payment for income tax withholding and social security taxes for the past 12 months. It is advisable to check with your local immigration office for specific documentation requirements, as these can vary by location. If your school is inexperienced with the process, seeking assistance from an accountant or consultant may be beneficial.