Do I need to cancel my visa when I finish my work permit in Thailand to switch to a retirement visa?

Okay we got to the bottom of it (y)

As was correctly deduced by

@Robert ******

(y) the O/P is indeed on an extension of stay based on employment 🙂

They have the luxury of their employer being flexible as far as when they issue the termination paperwork.

They now know that they need to cancel the work permit, take the termination documents from the employer AND the documentation to apply for the new year extension based on retirement to the immigration office.

Once they're there the office will cancel the current extension of stay and then they'll immediately apply for a new extension based on retirement.

They have already went to the Hua Hin immigration office and gotten the list of required documents for the retirement extension..

They understand now they're not on any visa (they're on an extension 😉 ) and they know they wouldn't be applying for any visa only changing the reason for their extension from employment to retirement for 1900baht 🙂

Best of luck to them, sorry to have hi-jacked/closed the thread but I needed to sort out what was what..

Thanx one and all for the comments