| Co., Ltd. (SME stack) | Bootstrapped services, cafés, agencies, small import/export. | Foreign-business certificate needs, minimum capital story, and director WP timing. |
| BOI promotion | Manufacturing, targeted services, or large capex with incentive case. | Headline incentives vs reporting cadence; visa/work facilitation letters vs reality on the ground. |
| Branch / rep office | Foreign HQ testing Thailand demand before full subsidiary. | Signing authority, taxable presence, and how Thai customers expect invoicing. |
| Joint venture / Thai partner | Regulated sectors or local distribution needs. | Governance, dispute resolution, and IP assignment—not only share split percentages. |
| HoldCo + operating sub | Regional groups routing contracts and IP cleanly. | Transfer pricing, intercompany loans, and substance in each entity. |