Thailand's voluntary carbon market is undergoing fundamental transformation from price-based competition to quality and credibility focus. The Thai Greenhouse Gas Management Organization's 2026 market outlook reveals buyers now prioritize carbon credit authenticity, international recognition, and co-benefits (especially biodiversity) over cost. This shift is accelerated by pending Climate Change Act implementation and introduction of Thailand's Premium T-VER standard. A parallel mandatory carbon trading system (ETS) is expected to launch next year, allowing 10% offset from voluntary credits. While 77% of Thai businesses see climate action as opportunity, only 56% have conducted emissions assessments, signaling untapped demand and significant SME market readiness implications.