@Bobby *******
working legally inside the country with a valid work permit is indeed a way to show salary (of at least 40K) as proof of funds AND you only need to show the last 3 months of proof of that to get the year extension BUT you also show a pile of paperwork from your employer, tax documents, articles listing the directors, the thais they employ to offset hiring a foreigner, etc.
It's quite a few hoops to jump thru but it can be done.
Sadly most employers are less than helpful if you're getting an extension based on marriage using your job as the reason because they know that if you lose your job you still keep the marriage extension and they don't have control of you like they would if you were on a non-B extension