I will second UK Traveler's advice (full disclosure: I happen to be a tax professional, but I'm not necessarily soliciting your business!). The advice is correct. However, to be sure all is in order with anything else that's going on, I would recommend asking sooner rather than later, in case you need to do some planning for the rest of the year.

BTW, this is all assuming you're already in this situation, which you never stated. Maybe you're just being optimistic!