1) You would file a Form 1040X, form this site:
http://www.irs.gov/pub/irs-pdf/f1040x.pdfThe instructions are on this site:
http://www.irs.gov/pub/irs-pdf/i1040x.pdf2) Yes, you should send a change of address for your current address only. The form is here:
http://www.irs.gov/pub/irs-pdf/f8822.pdfFor the “old address”, use the address from which you filed your 2008 Return. (Or if you have notified the IRS of a new address since you filed, use it.)
Let’s see if we can start your week out on a high note.
First, we need to know if you “declared” on the 2008 Form 1040, your interest earned in 2008. If you have a copy of what you filed, it would be on Line 8a of Form 1040.
A) Even if you didn’t declare the 2008 interest earned, you have 3 years from the time of filing (June 2009 for US taxpayers abroad, so June 2012) to correct the error of omission.
B) For 2008, you had a $5,450 standard deduction plus a $3,500 personal exemption. I am making the assumption that you didn’t receive more than $8,950 (5450+3500) in interest in 2008.
C) You did file a return for 2008, so you shouldn’t have any additional “interest” (due to late filing) owing even if you didn’t declare the 2008 taxable interest earned.
(I stress “shouldn’t” do to the fact that IRS rules are changing even as I type this. It’s currently difficult to say anything is 100% true. For this reason, I can’t say what may arise in penalties, since the IRS/Congress are on a witch hunt regarding Foreign Assets such as Bank Accounts. That’s why many individual responses on this thread, and others, may seem vague. ) I’m basing this assumption on the level of income and 2008 interest you have indicated, and the fact that if it had been declared, you still would have owed $0 in tax.
D) All of this is an “assumption” based on a return that only involved excluding income below $87,000 on 2555 or 2555EZ, and with additional taxable interest (of the level you are indicating) requiring to be declared. Any other variation (income, deductions, other forms, etc.) on this voids the assumption.
E) From what you have indicated in all the posts above, I feel (and I must stress, my amateur opinion only) you have not done anything illegal. So don’t subject yourself to any needless worry.
We may get further posts which disagree with this.