Nah, if you have savings pre-2024 then its still tax free (grandfathered in) and if you don't have savings from before then you can legally gift your wife tax free upto 20m THB (or kids each) per year.
For me i own a % of a overseas company and am︀ not involved in the day to day, obtain dividends every 5-10 yrs so for me︁ its just a case of doing some trips when my next dividends hit, and they︂ will be taxable if i remit them, or non-taxable if i gift them.
Aside from︃ that as mentioned i receive dividends every 5-10 yrs which means i am living on︄ savings, which as mentioned are tax free, but if for example i've invested some of︅ said funds, i can liquidated those positions, and remit the principle to Thailand tax free,︆ but if i remit the capital gain then that is taxable.
Hope that makes it︇ easier.
As for world-wide un-remitted income this one is easy for me, as said, i︈ own % of company but am not involved in the day-to-day, additionally i don't see︉ a income/salary.
So there's only potentially tax if they tax world wide in the year︊ i get dividends, as my dividends are basically deferred till the company does a dividends,︋ then in that year i can mooch in say Bali, HK, Kenya for a bit︌ and Thailand, and it would be tax free but if i remit said funds they︍ would be taxable if i am in the country more than 180 days (obviously if︎ i am paid dividends when not in Thailand 180+ days - dividend year) then remit️ said funds they'd also not be tax free.
Hope that helps you understand the best approach.