How do I figure out the taxable amount on a withdrawal from my 403B? I have a 1099-R but there is nothing in box 2b?

[DavidD66]

It is not unusual for Box 2b to be blank on Form 1099-R.  Unless your 403-B plan allows after tax contributions and/or a Roth 403(b) option, 100% of your distribution will be taxable.  If you have distributions from an after tax account or a Roth 403(b) account, they would be reported on a separate Form 1099-R.  The tax treatment of the distribution will be determined by the code in Box 7 which you enter into the program.