What happens if you overstay your visa while waiting for an extension of stay in Thailand?

If you overstay your visa while waiting for an extension of stay in Thailand, the outcome largely depends on the discretion of the immigration office handling your application. Generally, being on overstay means you are technically in the country without permission. Although you may have submitted your extension paperwork, it's crucial to communicate directly with immigration. They might charge a daily fine for the overstay (typically 500 Baht per day) but can still grant you an extension. However, if your visa application is under consideration, it's advised to avoid leaving the country, as this could invalidate your application, requiring a fresh visa application process.