Yesterday my wife and I received a letter from the IRS stating their records show data that was not submitted on our 2012 tax return. The missing information was a ~$5k 1099-INT, which means the IRS thinks I owe them about $1400.

The form was submitted with my wife's SSN. However, we never received the 1099-INT to our house (I file all of the tax related documents together), and she doesn't think she's ever had an account at the organization which issued it. (Obviously, we didn't receive the $5k either.) The sticky part of this situation is that we have no evidence to the contrary of what the IRS claims; we only have the statement that my wife never had such an account and that we did not receive the funds or the paperwork.

My current plan is to contact the bank first thing on Monday and inquire about the account (the IRS form provides the account number and the SSN).

What's the best way to proceed on something like this? Has anyone else been in a similar situation?