How early can I extend my 45-day visa exemption in Thailand?

The timing for extending a 45-day visa exemption in Thailand can vary by immigration office. Some offices, such as those in Bangkok, Chiang Mai, Phuket, and Buri Ram, may allow extensions up to 45 days before the visa expires, while most others only accept extensions starting 30 days prior. Some sources suggest requesting an extension only within 2 weeks of the expiration date for better acceptance. Ultimately, extending the visa does not change the end date of the current entry stamp, and applicants can go anytime to the office for this process.