Usually, a distribution from a qualified retirement plan is treated as ordinary income in the year in which it is received. However, for someone born before 1936, there is a special 10-year averaging rule. It only applies, however, to a lump-sum distribution. This is a distribution payable within a single tax year of a plan participant’s entire balance from all of the employer’s qualified plans of one kind (for example, pension, profit-sharing, or stock bonus plans).
Eligible taxpayers may claim a tax credit for 10%, 20%, or 50% of up to $2,000 of retirement plan contributions.