First, did you ever make any after-tax contributions to your retirement plan? If not, then the issue is moot: 100% of the distribution is taxable.
From your question, I am assuming that you do have some "cost" or basis" (after-tax contributions) in your plan.
First, contact your plan administrator and see if by some miracle, they kept track of your after-tax contributions, your annuity start date, and how much of the after-tax contributions you have already received back.
Once you get this information, put it in a safe place, because you are responsible for it.
Look at your previous returns. Are there any worksheets with them? Perhaps this information is printed on one of the worksheets.
OK, if that doesn't work, do you know your taxable amount from last year? If your distribution was the same amount this year as last year, then the taxable amount very likely is the same.
However, the last way to do this - if you have a spouse who wouldn't mind running and re-running the numbers - is to enter what you know in the Simplified Method and see how close you come to last year's taxable amount. And then do it again, hoping to get closer.
Make sense?
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