You may be okay. Here are the facts as I understand them:
- You cashed out a retirement plan for your move and then paid your STBX her share of what you received.
- What you received was already cut 20% for taxes.
- As a Katrina victim, you may be entitled to penalty-free withdrawal from your retirement plan.
What this means to me is that, depending on whether penalty-free withdrawal is available to you, you may have already had enough withheld to pay the taxes you are going to owe.
You are correct that you and your STBX will be filing as single taxpayers for 2006 as long as your divorce is effective by December 31, and as long as neither of your remarries before the end of the year.
You cannot and should not try to issue her a 1099. That will confuse the issue. Instead, go ahead and schedule that visit with your accountant BEFORE you sign the divorce documents. If your STBX needs to compensate you for taxes, build it into the separation agreement.