Maybe it's a sily question, but it turned out in one of our games and I think we managed it wrongly:

The Core Set plot "Planning Ahead" has the description: "Skip taxation phase this turn". That is meant to everybody, or just the player that played this plot? I am thinking it means everybody, but there's that explanation that says that the text of all card is directed to the owner of the cards. There is an obscure "you" on this plot's description?

It means everyone. You just act as if the Taxation phase isn't there. So no one puts gold back into the gold pool.

Yeah, and just to clarify: theres only one phase of each type in a turn. All player share the same Plot, Draw, Marshalling, Challenges, Dominance, Stand and Taxation phases.

got it, thank you!

Granted, it would probably be clearer if the plot said "There is no Taxation phase this round," but eloooooooi's explanation accurately describes the reason why that phrasing is not strictly necessary. Either everyone skips a phase a phase, or no one does.