I use Turbotax.com ..it's not expensive, and sometimes they have promos where they will file federal for you for free! It's easy to follow too. You just answer the questions and then Turbotax does the calculating for you which is definitely better for me, I am so math challenged lol.. Anyhow, it's also great for filing abroad too...there is an option for filing non US earnings (Foreign earned income)...which I did, and if you don't make above a certain amount
(from the IRS site:If you are a U.S. citizen or a resident alien of the United States and you live abroad, you are taxed on your worldwide income. However, you may qualify to exclude from income up to $91,400 of your foreign earnings. In addition, you can exclude or deduct certain foreign housing amounts.)
, you won't owe or gain anything back. I know so many people here who have not gone back to the states in ages and never filed but I've been told it's not a good idea...a couple of them got audited when they got back, and I know at least one who actually got audited while they were here, they were still using a permanent address back home such as their parents' address. They had to provide all their paystubs from the the time they started to not file their taxes in the states, which can be tricky here since some places are not very good at giving out paystubs and they aren't very official looking and they said it was just a hassle...
at any rate...the IRS.gov site says many US Embassies have IRS offices to get tax help and the info they list for the UK is...
U.S. Embassy
24/31 Grosvenor Square
London W1A 1 AE
England Walk-In Assistance:
Tu-Th: 9 a.m. to 4 p.m.
Phone Service:
M-F: 9 a.m. to 12 p.m. & 1:30 p.m. to 3 p.m.
Tel: +44-207-894-0476
Fax: +44-207-495-4224
Email: irs.london@irs.gov
http://www.irs.gov/businesses/small/international/article/0,,id=97324,00.htmlhas more info on filing taxes for US citizens abroad
Hope some of that is helpful