US citizens and green card holders are required to file a US tax return if their annual income exceeds certain thresholds, regardless of whether the income was earned in the US or abroad. The regular filing deadline is April 15th, but Americans living abroad have until June 15th to file. An automatic extension can be obtained by filing Form 4868 by October 15th. Those with over $10,000 in foreign bank accounts must file Form TD F 90-22.1 by June 30th to report them, or face penalties. Greenback Tax Services helps expat Americans file their required US tax returns and foreign bank account reports for a fixed, low price.