For purposes of subdivision (i) of this subparagraph, a class of partners may, in an appropriate case, contain only one member. Payments are made on a periodic basis if made at regularly recurring intervals (usually monthly) not exceeding one year.
By application of the conditions set forth in this subparagraph, either all payments on account of retirement received by a retired partner during the taxable year of the partnership ending within or with his taxable year are excluded or none of the payments are excluded. Subdivision (ii) of this subparagraph has application only to obligations from other partners in their capacity as partners as distinguished from an obligation which arose and exists from a transaction unrelated to the partnership or to a trade or business carried on by the partnership. The effect of the conditions set forth in subdivisions (ii) and (iii) of this subparagraph is that the exclusion may apply with respect to payments received by a retired partner during the taxable year of the partnership ending within or with his taxable year only if at the close of the partnership's taxable year the retired partner had no financial interest in the partnership except for the right to retirement payments.
Example (1). A, who files his income tax returns on a calendar year basis, is a partner in the ABC partnership. The taxable year of the partnership is the period July 1 to June 30, inclusive. A retired from the partnership on January 1, 1973, and receives monthly payments on account of his retirement. As of June 30, 1973, no obligation existed from the other partners to A (except with respect to retirement payments under the plan) and A's share of the capital of the partnership had been paid to him in full. The monthly retirement payments received by A from the partnership in his taxable year ending on December 31, 1973, are not excluded from net earnings from self-employment since A rendered service to the partnership during a portion of the partnership's taxable year (July 1, 1972, through June 30, 1973) which ends within A's taxable year ending on December 31, 1973.
Example (2). D, a partner in the DEF partnership, retired from the partnership as of the close of December 31, 1972. The taxable year of both D and the partnership is the calendar year. During the partnership's taxable year ending December 31, 1973, D rendered no service with respect to any trade or business carried on by the partnership. On or before December 31, 1973, all obligations (other than with respect to retirement payments under the plan) from the other partners to D have been liquidated, and D's share of the capital of the partnership has been paid to him. Retirement payments received by D pursuant to the partnership's plan in his taxable year ending December 31, 1973, are excluded in determining his net earnings from self-employment (if any) for that taxable year.
Example (3). Assume the same facts as in example (2) except that as of the close of December 31, 1973, D has a right to a fixed percentage of any amounts collected by the partnership after that date which are attributable to services rendered by him prior to his retirement for clients of the partnership. The monthly payments received by D in his taxable year ending December 31, 1973, are not excluded from net earnings from self-employment since as of the close of the partnership's taxable year which ends with D's taxable year, an obligation (other than an obligation with respect to retirement payments) exists from the other partners to D.
26 C.F.R. §1.1402(a)-17