Let's consider both scenarios if you do not mind.depends on if you are selling to anyone locally in Belize or if you set this up 100% offshore!
Let me guess.
If you sell to anyone locally in Belize (which can strictly never be totally prevented even if trying a customer might circumvent this) then I guess it's a Belize tax resident? But to what extend? On the part sold in Belize? Or the company's worldwide income? Really a Belize tax resident just because having Belize customers? Consider the following.
I was also hearing from multiple sources that if an USA 1 person LLC by a non-resident (no greencard, no substantial presence test positive, no USA citizenship) is a disregarded entity for tax purposes for foreign source income. USA source income however needs to be taxed. But then also simply having USA customers and no PE does not result in fulfilling the legal definition of USA source income. (Confirm this by yourself if you are after this, dear reader. This is just for comparison.)
If only selling to non-Belize then not tax resident in Belize and thereby effectively no tax resident anywhere?