They will figure out your taxes (according to whatever information they have at the time) and retaliate if you file something that doesn't jibe. They just won'

They will figure out your taxes (according to whatever information they have at the time) and retaliate if you file something that doesn't jibe. They just won't do it before you do. That way, they might learn things they didn't yet know, from people who decide (as legally obligated) to divulge additional information. I assume that they assume that far fewer people would divulge additional information, if their "you talk first, I talk second" tactic went away.