Which of the following is correct?
Es posible que el presidente anuncie que el gobierno aumenta los impuestos el próximo año.
Es posible que el presidente anuncie que el gobierno aumente los impuestos el próximo año.
It is possible that the president announces that the government will raise taxes next year.
(Yeah, I know you probably wouldn't phrase it like this in actual speech, but it's just an example to illustrate the concept. Also ignore the fact that there's no subjunctive in the English sentence because it's used for volition only, not uncertainty, unless you want to sound archaic.)
Basically, you have a verb "aumentar" embedded in the subjunctive "anunciar." Is there one correct answer, or does it depend on whether the speaker of the sentence knows whether the government will raise taxes?