"When you will" is a phrase that expresses the time or moment that something is expected to happen. However, there are many synonyms that can change the tone and meaning of this phrase. For example, instead of "when you will," one could say "once you've," "at the moment of," or "as soon as." Similarly, other ways to express the same idea might include "whenever," "upon," or simply "when." The choice of a synonym for "when you will" can depend upon the context in which it is used, the level of formality, and the tone that the speaker wishes to convey.