Does a Multiple Entry Permit Remain Valid After Switching from a Retirement Extension to a Marriage Extension in Thailand?

I mean seeing as you can only apply for a new extension a maximum of 45 days before your old extension expired the longest you'd get trying to use the old re-entry permit would be what 6 weeks?

Just buy a new one good until the marriage extension runs out, that way you're 100% sure you can get out/back in and not run yourself off the rails

This topic comes up once in a while and this is what I've been told at the immigration office AND at passport control stamping back into the country

Re-entry permits are tied to the extension you got them under, when you apply for a new extension, you need a new re-entry permit, EVEN if you're going to leave come back before the old re-entry permit expired (because you can apply for an extension a month before your old one runs out)

I'd say don't chance it, get a new re-entry permit once you go back to get the year extension inked in.

I will relate that a person who did apply for his yearly extension 45 days early got it, then left the country was able to return on his old re-entry permit which was still valid when he came back into the country BUT passport control told him about the "re-entry tied to extensions, get a new extension, get a new re-entry" concept they usually run under.

I will leave you to decide what you want to do..