When switching from Sole Prop to LLC, how does this change filing taxes?

I usually do my friends Sched C taxes, but last year in Oct he changed to a LLC. The business is still pretty much the same. He is the sole owner, has no employees and its typically a very easy Sched C to do. I'm concerned about doing his taxes this year because I've never done one for an LLC. What do I need to be aware off? How will this differ from the Sched C?