@John *******
Yep. Though some offices do not accept the combination method, so it must be discussed with the local immigration office first. (Even though this method is official).
The fun part is that the method is *not* officially approved for those on a marriage visa but apparently there are some offices which allow for a combined income / bankbalance method as proof of funds.
Thailand is… Thailand. 😉
I’d say Better stay on the safe side. Choose either the bank balance method or the income method and don’t go for combined unless 1) You really have to, and 2) You have discussed this with the local immigration office and they approved it.