The tax treatment of distributions received at or after retirement depends on the time and manner of distribution.
If a distribution is rolled over to an IRA or other eligible retirement plan, taxation of the amounts rolled over is deferred until it is distributed in the future ( Q 3996).
If a lump sum distribution is made, it is subject to the treatment explained in Q 3971 and, in the case of net unrealized appreciation on employer securities, as explained in Q 3972.