What is the process to apply for a Non-Immigrant O visa for retirement in Thailand?

Hi everyone,

I'm currently in Australia and looking to apply for a Thai Non-Immigrant O visa as a step toward obtaining a retirement visa in Thailand. From what I understand, this is the correct path—please let me know if that’s not right.

I checked the Royal Thai Embassy Canberra website and found the following required documents:

1. Biodata page of your passport or travel document

2. A recent photograph (taken within the last 6 months)

3. A document showing your current location (e.g., utility bill or driver’s licence)

4. A letter of qualification endorsement issued by the Thailand Board of Investment (BOI) — This letter is only valid for 60 days and must be applied for via [[members only])

I’m a bit confused about point #4. Has anyone here applied for this BOI qualification letter? What exactly does it involve, and how do you go about it if you're applying as a retiree (not under a business or investment category)?

If you've gone through this process, I’d really appreciate it if you could share your experience or walk me through what you submitted and how long it took.

Thanks so much in advance!