June 30 is the deadline to file your annual “show and tell” about all the offshore bank accounts over which you have signature authority. The IRS used a quaint 20th Century device called a “press release” to remind you about filing your disclosure form.
Form TD F 90-22.1 is what you use. (Warning: PDF).
The IRS FAQ about reporting foreign bank accounts is useful. Read it if you have questions.
A bit of advice: if you MIGHT be someone who has to file this form, and you get a brainstorm with a staggeringly clever trick so you don’t “technically” have to file–check your clever idea by talking to someone whose brain is not infected with your thinking. 🙂