Can my wife apply for a dependent visa if I have a retirement visa in Thailand?

Your best bet is to contact that Thailand Trade and Economic Office in Taipei (which takes the place of the consulate) and see if you can apply for the 90 day Non-O based on 'retirement' and your spouse can apply for the 90 day Non-O based on 'trailing spouse' BEFORE you come here.

That way you both will get stamped in for 90 days and then both you and your wife can get the year extension(s).

Mor than a few people have had to do that before comin' here if they're doing what you're planning (retirement & trailing spouse).

please note that the Thai embassy in Vientiane refused to give a Non O for my wife, 2-3 weeks ago. Instead they gave a TR tourist visa which is not what we wanted.

@Lee ******

one other thing for this trailing spouse visa/extension is the certification of the marriage certificate by your embassy (if it's offered in thailand) and/or by sending it back to your country (as people who were married in the UK have to nowadays)

Many immigration offices require the foreign marriage certificate to be certified SO check with your immigration office when you are going thru the Non-O process for the primary retirement visa holder and let them know you will have a 'trailing spouse' and see what they tell you as far as what you need to do with the marriage certificate.

So you will meet the financial requirements (800K baht in a thai bank account in your name only) and get first the 90 day Non-O visa and then 2 months later get the year extension?

Unfortunately your wife cannot get a Non-O visa based on being a trailing spouse to someone on an Non-O (retirement) inside the country at most immigration offices.

(There are reports that the Phuket office recently changed their policy and will allow 'trailing spouse' Non-O's to be issued in country with a spouse on retirement but no reports that anyone has actually done it yet.

Most other offices ill not issue it at all, meaning you get your 90 day non-O, then the year extension and send your wife to a thai consulate nearby to get the 90 day trailing spouse Non-O after that.