Personal preference. If you want to get really nit-picky there's a school of thought that says pleated trousers should have them and plain front trousers should not. Rubbish. But it's pretty much universally understood that there should be no trouser cuffs on black or white tie.Formal as in formal-formal? Or formal as in business suit?
I'm just talking about a garden-variety Mo-Fri business suit.
I can't believe I'm beating Andy to the shameless-plug post:
"Sophisticated men wear cuffs on their pants, and other sophisticated men notice. Cuffs are de rigueur with pleated pants especially suit trousers and look great on casual pants too. They also serve a function of adding extra weight to the bottom allowing the pants to hang better.
The latest E&R brochure shows the model wearing turn-ups on a suit and odd trousers. Nice deep ones.I haven't worn them since the 50s. Personally, I think they look silly on trim-cut, pleatless trousers. Why not checkout Ede & Ravenscroft or some other trim-cut suit maker, and see what their clients are wearing.