Do funds for the NON-O visa need to be seasoned for two months before applying for a retirement extension?

Sadly

@Mark *******

there is no 100% fool proof answer.

At MOST offices you can apply for the initial 90 day Non-O visa once you have the funds in your account as long as you have enough days left on your current stamp to cover the under review period (14 - 20 days depending on the office)

BUT

at some offices (Jomtien especially) you need to have the funds seasoned the 2 months BEFORE you apply for the initial 90 day Non-O visa

AND

at other offices (Bangkok especially), for retirement Non-O visas you must show the 800K baht came into the country from an overseas transfer.

You need to go check with your office