@Toño ******
It depends on WHERE you apply for the 90-days visa
*** in your home country you only need proof that you HAVE a deposit of a minimum of 400,000.- THB or equivalent in another currency on your bank account. The account can be anywhere, you only need to prove it is in your name. No seasoning required
*** if you apply for the 90-days visa on Immigration in Thailand by applying for the “change of visa type”, you only need to prove that the minimum of 400,000.- THB are sitting in a Thai bank account in your sole name. No seasoning required
1-year Extension of Stay:
*** when applying for the “1-year extension of stay permit” on Immigration, the 400,000.- THB must have seasoned for two months and this has to be confirmed by your Thai bank
ATTENTION: Immigration Jomtien/Pattaya has the bad reputation of enforcing a 2-months seasoning of the funds already when applying for the “change of visa type”. Beware!