It/that depends - Idioms by The Free Dictionary
That (all) depends.
My answer depends on factors that have yet to be discussed. Tom: Will you be able to come to the meeting on Thursday night? Mary: That all depends. Bob: Can I see you again? Sally: That depends.
it/that (all) deˈpends (informal) perhaps; possibly: ‘Would you marry him if he asked you to?’ ‘I might. It all depends.’ ♢ ‘But is it right to send people to prison?’ ‘It depends what you mean by right!’