My extension of stay based on employment ends April 30. If I have a termination letter from my employer stating this date can I cancel the extension at the border? I plan to leave the day before which is a Sunday so immigration won’t be open. My employer has already said I don’t need to work on the Monday and will cancel my work permit on or after that date. 

Your extension will become void when you leave the country.

Immigration at Nong Khai will want the termination letter or they would not allow you to leave the country.

Thanks for the help. Will be starting the non b process again soon after returning so didn’t want anything jeapardizing that application. 

15 minutes ago, Aussie D said:

Thanks for the help. Will be starting the non b process again soon after returning so didn’t want anything jeapardizing that application. 

You could go to immigration a few days before the 30th and they would post date the cancellation to the date on the termination letter. That ways you would get a formal cancellation and have no problems at the border.

Can my employer then cancel my work permit after i cancel the extension using termination letter?  My employer thankfully have done everything by the book and Im leaving on good terms. 

23 minutes ago, Aussie D said:

Can my employer then cancel my work permit after i cancel the extension using termination letter?  My employer thankfully have done everything by the book and Im leaving on good terms. 

Yes they can.