Even if the work is unpaid, Thailand’s labor laws broadly define “work” as any physical or mental effort exerted for the purpose of producing something or providing a service. Therefore, engaging in any form of work on your wife’s farm—paid or unpaid—may still require a work permit.
Key Points:
1. Definition of Work:
• Under Thai law, “work” includes any activity, regardless of compensation. This means unpaid assistance, such as helping on the farm, could technically fall under the definition of work.
2. Exceptions for Family Activities:
• If your involvement on the farm is strictly personal and limited to casual, family-oriented tasks (e.g., gardening or feeding animals as a hobby), it might not be considered “work” in the legal sense. However, this is a gray area, and interpretation can vary.
3. Risks Without a Work Permit:
• Foreigners caught working without a permit—even on their spouse’s property—could face fines, deportation, or bans from re-entering Thailand.
4. Cultural and Practical Realities:
• Enforcement varies by location. In rural areas, local authorities might be more lenient, especially if the work is minor and visibly informal. However, relying on leniency carries legal risks.
ChatGPT: In Thailand, any form of work—whether paid or unpaid, full-time or part-time—requires a valid work permit, regardless of marital status. This means that as a foreigner married to a Thai national, you must obtain a work permit to legally engage in any work activities on your wife’s farm. 
The Thai government mandates that all foreign nationals secure a work permit before undertaking employment or business activities. This requirement applies universally, irrespective of the nature of the work or the employer’s identity. 
However, being married to a Thai citizen does offer certain advantages in the work permit application process. Typically, a Thai company must have a registered capital of 2 million THB and employ four Thai nationals to hire one foreign employee. For foreigners married to Thai nationals, these requirements are reduced to 1 million THB in registered capital and two Thai employees. 
In summary, to legally work on your wife’s farm in Thailand, you must obtain a work permit, even if the work is unpaid. Your marriage to a Thai national may facilitate this process by easing certain regulatory requirements.
I did this too. Can’t take another second of people who vote against their own 10 Commandments. If you want an evisa and to stay 90 days, you need to have all your flights (an agency for a fake flight might be best because even Delta flights that say refundable may be nonrefundable) and accommodations arranged for approval. The first day is the day of approval. However, if you don’t have all the information given in one pdf it will be rejected and they don’t review for a few days if you turn it in again.