The form that you each receive will have a form number on it. You need to choose the correct form that you received.
Which of these did you receive?
Form 1099-R, Withdrawal of money from 401(k) retirement plans, pensions, IRAs, etc.
Form CSA-1099-R, Civil Service annuity
Form CSF-1099-R, Civil Service survivor annuity
Form RRB-1099-R, Railroad Retirement Board annuities and pensions
