@Alan *****
RIGHT, so you got your extension last year with a passport valid LESS than a full year, meaning you only got the extension for the time the passport was good.
As ellie said, IF you don't get that new passport back in time and start racking up overstay, it's totally gonna be up to the immigration office IF they'll let you clear the overstay then apply for the year extension right then..
I have seen it done as long as the overstay is under the 40 day threshold 😮
That's the number of days you can overstay and be charged 500baht a day.
After 40 days the overstay fine caps and I've NEVER seen them allow an extension even if you pay the 20K baht fine for overstaying.
They tell you to leave and come back to start the whole process over and just pay the overstay at the airport on the way out