Can my wife keep her DTV visa if I switch to a Non-B visa?

Legally when you change visa types you have to change the dependent attached Visa as well this is required since her visa is tied to a no longer valid DTV.

You will want to get your non-being and cancel her DTV dependent and get her a non-o-dependent tied to your non-b.

With an agent you can probably do it in country, without an agent you may very well need a border run.

The tm-86 change of Visa form is not always something that they want to do in country even though it is a valid immigration form.

There is a strong preference for doing what is familiar by most people working in the government offices and if they are not familiar with the change it is going to come across as strange to them.

My wife is a Visa agent so we have access to most rules for most provinces because honestly there's no way to keep track of all 73.

Moreover, they're about to move to a digital work permit system as well (change in progress arm), so I would imagine all visas; dependent or otherwise, will soon be tied to the online system.as it's clear they're moving that way.

As long as the main dtv is valid (5 year validity) she can remain a dependant.

I'd keep the dtv as a backup in case you leave the company. It remains valid, but you'll have to leave the country to activate the new visa

A dependent visa is linked to another valid visa. Legally, it loses its validity once the main visa is no longer active. I recommend checking directly with the immigration office where you’re applying for your new visa, rather than listening to so-called experts who have never even set foot in an immigration office.

Legally she would be a "Dependent" on a non-existent visa. If this was for a " B" in same situation it would be cancelled along with yours. Is the DTV linked in a similar fashion in the system? Even if not if anything was found later it might be a sticky situation. What would your employer make of it too if you had to go asking for a dependent on the B at a later date and immigration made it problematic due to misuse of a previous visa? Why take risks? I would just get her the dependent on your new visa.

Note that I believe the only way you can switch to a Non-B visa is to apply to do a conversion at an immigration office inside Thailand so make sure the company will supply the correct information to support that. Many companies want people to apply for a Non-B outside Thailand but you won't be able to do that unless you can find a way to first cancel your DTV (which won't be easy).

If you switch to a Non-B visa, your wife’s current DTV (issued as a dependent) will likely lose its legal basis, since her status is tied to your DTV. Even if her stamp doesn’t mention “dependent,” immigration can still link it to your original application.

When she does her border run later, she may face entry issues if your DTV is no longer active.

The safest option is to cancel her DTV and apply for a Non-O dependent visa once your Non-B and work permit are confirmed, even if you’re still in probation. That gives her a clear, stable legal status under your new visa.

Best

Leave her visa as is 👌