10:17 pm PST February 26, 2015
Possibly - But if so, it has already been factored into the taxable amount reported. Full definition, from 1099-R instructions:
Box 5. Employee Contributions/Designated Roth Contributions or Insurance Premiums
Enter the employee's contributions, designated Roth contributions, or insurance premiums that the employee may recover tax free this year (even if they exceed the box 1 amount). The entry in box 5 may include any of the following. (a) designated Roth contributions or contributions actually made on behalf of the employee over the years under the plan that were required to be included in the income of the employee when contributed (after-tax contributions), (b) contributions made by the employer but considered to have been contributed by the employee under section 72(f), (c) the accumulated cost of premiums paid for life insurance protection taxable to the employee in previous years and in the current year under Regulations section 1.72-16 (cost of current life insurance protection) (only if the life insurance contract itself is distributed), and (d) premiums paid on commercial annuities. Do not include any DVECs, elective deferrals, or any contribution to a retirement plan that was not an after-tax contribution.
Generally. for qualified plans, section 403(b) plans, and nonqualified commercial annuities, enter in box 5 the employee contributions or
insurance premiums recovered tax free during the year based on the method you used to determine the taxable amount to be entered in box 2a. On a separate Form 1099-R, include the portion of the employee's basis that has been distributed from a designated Roth account. See the Examples in the instructions for box 2a, earlier.
If periodic payments began before 1993, you are not required to, but you are encouraged to, report in box 5.
If you made periodic payments from a qualified plan and the annuity starting date is after November 18, 1996, you must use the simplified method to figure the tax-free amount each year. See Annuity starting date in 1998 or later, earlier.
If a total distribution is made, the total employee contributions or insurance premiums available to be recovered tax free must be shown only in box 5. If any previous distributions were made, any amount recovered tax free in prior years must not appear in box 5.
If you are unable to reasonably obtain the data necessary to compute the taxable amount, leave boxes 2a and 5 blank, and check the first box in box 2b.
For more information, see Rev. Proc. 92-86, 1992-2 C.B. 495 and section 72(d)."
For reporting charitable gift annuities, see Charitable gift annuities. earlier." http://www.irs.gov/instructions/i1099r/index.html