Do you lay tile before or after trim?

Generally you would put the trim on after the tile is done. Especially if you are laying ceramic tile and need a mud base or cement board. If the room connects to another without tile, I would do the trim first. For example, the kitchen has tile and it flows directly to the dining room that has wood down and won't be replaced. If you put the trim down after the tile, the trim in the kitchen will be at least 3/4" taller then the dining room. This is only an issue when you have a really open floor plan.