If you are a US citizen, you have to file a tax return every year.
TD Waterhouse will submit details of those who ticked "yes" to the IRS, so they may come after you.
It's the same with opening bank accounts and investments with insurance companies. All have committed to going through all their account holders and informing the IRS of who is a US citizen.
Risks: You get audited by the IRS and get the penalties and charges if you are non compliant.
Steven
http://www.bluewaterfp.ie (www.bluewaterfp.ie)