Form 2350

Application for Extension of Time To File U.S. Income Tax Return, available only to US citizens and residents abroad who expect to qualify for the foreign earned income exclusion but cannot yet, because the bona fide residence period or the 330-day window has not closed. It is not Form 4868 with a different number: it exists for one purpose, and it can extend beyond 15 October — generally to 30 days after the date you expect to qualify. It is filed by the normal due date of the return and, unlike Form 4868, it is not automatic; the IRS can deny it. The trade-off is the usual one: it buys time to file, not time to pay, so interest runs on any balance from April regardless of how long the exclusion takes to ripen.