| 1958 |
| (1) Amount contributed by employer for annuity contracts in 1958 | $1,000.00 |
| (2) Includible compensation for most recent one-year period of service (since A was employed for only 3/8 of a year at the close of 1958, this period is counted as most recent one-year period of service) 3/8 × $8,000 | $3,000.00 |
| (3) 20% × includible compensation | $600.00 |
| (4) Number of years of service (although A was employed for less than a year, he is considered to have one-year of service) | 1 |
| (5) Item (4) × item (3) | $600.00 |
| (6) Contributions excludable in prior taxable years of A | None |
| (7) Amount excludable from A's gross income for 1958 ((5)—(6)) | $600.00 |
| (8) Amount includible in A's gross income for 1958 ((1)−(7)) | $400.00 |
| 1959 |
| (9) Amount contributed by employer for annuity contracts in 1959 | $2,000.00 |
| (10) Includible compensation for most recent one-year period of service. (3/8 × $8,800+5/8×$8,000) | $8,800.00 |
| (11) 20% × includible compensation | $1,660.00 |
| (12) Number of years of service | 13/8 |
| (13) Item (12) × item (11) | $2,282.50 |
| (14) Contributions excludable in prior taxable years of A (item 7)) | $600.00 |
| (15) Amount excludable from A's gross income for 1959 ((13)−(14)) | $1,682.50 |
| (16) Amount includible in A's gross income for 1959 ((9)−(15)) | $317.50 |
| 1960 |
| (17) Amount contributed by employer for annuity contracts in 1960 | $2,400.00 |
| (18) Includible compensation for most recent one-year period of service (3/8×$9,600+5/8×$8,800) | $9,100.00 |
| (19) 20% × includible compensation | $1,820.00 |
| (20) Number of years of service | 23/8 |
| (21) Item (20) × item (19) | $4,322.50 |
| (22) Contributions excludable in prior taxable years ((7) + (15)) | $2,282.50 |
| (23) Amount excludable from A's gross income for 1960 ((21) − (22)) | $2,040.00 |
| (24) Amount includible in A's gross income for 1960 ((17) − (23)) | $360.00 |
| 1961 |
| (25) Amount contributed by employer for annuity contracts in 1961 | $1,400.00 |
| (26) Includible compensation for most recent one-year period of service (5/8 × $9,600+3/8×$9,600) | $9,600.00 |
| (27) 20% × includible compensation | $1,920.00 |
| (28) Number of years of service | 3 |
| (29) Item (28) × item (27) | $5,760.00 |
| (30) Contributions excludable in prior taxable years ((7) + (15) + (23)) | $4,322.50 |
| (31) Amount excludable from A's gross income for 1961 (item (25) since it is less than (29) − (30)) | $1,400.00 |
| (32) Amount includable in A's gross income for 1961 ((25) − (31)) | None |