@John *********
their salary IF they were still employed would be okay to show for proof of funds to switch their extension from one based on employment to one based on marriage to a thai, BUT stopping working means it is highly unlikely that the immigration office would accept the previous 3 months of tax documents showing their salary, plus they wouldn't have their contract, work permit etc.
I think they can't DO the switch to an extension based on marriage to a thai using FORMER employment and would have to do it based on banked money method