The two forms that you need to enter into your tax return are your W-2 and your Form 1099-R.  There is nothing to deduct with regard to money that has accrued in your IRA since retirement. 

The W-2 will take care of reporting your contributions to your retirement plan prior to your retirement.  The Form 1099-R will take care of reporting the rollover of funds from your retirement plan to an IRA. 

When you enter the information from the Form 1099-R, the follow-up questions that ask what type of IRA the money was rolled into will determine whether any of the rollover is taxable.  If it went to a Traditional IRA, there should be no tax consequence.  If it went to a Roth IRA, then it is likely being taxed.