Notes
1. Section 708 of Title VII of the Social Security Act modifies the provisions for the delivery of Social Security benefit checks when the regularly designated delivery day falls on a Saturday, Sunday, or legal public holiday. Delivery of benefit checks normally due January 3, 1982 occurred on December 31, 1981. Consequently, the SMI premiums withheld from the checks ($264 million) and the associated general revenue contributions ($883 million) were added to the SMI trust fund on December 31, 1981. These amounts are excluded from the premium income and general revenue income for calendar year 1982.
2. For 1982, reflects $12,437 million loaned to the OASI trust fund under the interfund borrowing provisions of the law. For 1985 and 1986, reflects repayments of loan principal of $1,824 million and $10,613 million made in those two years, respectively.
3. Delivery of benefit checks normally due January 3, 1988 occurred on December 31, 1987. Consequently, the SMI premiums withheld from the checks ($692 million) and the associated general revenue contributions ($2,178 million) were added to the SMI trust fund on December 31, 1987. These amounts are excluded from the premium income and general revenue income for calendar year 1988 (refer to note 1).
4. Delivery of benefit checks normally due January 3, 1993 occurred on December 31, 1992. Consequently, the SMI premiums withheld from the checks ($1,089 million) and the associated general revenue contributions ($3,175 million) were added to the SMI trust fund on December 31, 1992. These amounts are excluded from the premium income and general revenue income for calendar year 1993 (refer to note 1).
5. Delivery of benefit checks normally due January 3, 1999 occurred on December 31, 1998. Consequently, the SMI premiums withheld from the checks ($1,512 million) and the associated general revenue contributions ($4,711 million) were added to the SMI trust fund on December 31, 1998. These amounts are excluded from the premium income and general revenue income for calendar year 1999 (refer to note 1).
6. Delivery of benefit checks normally due January 3, 2010 occurred on December 31, 2009. Consequently, the SMI premiums withheld from the checks ($4,070 million, consisting of $3,861 million for Part B and $209 million for Part D) and the associated general revenue contributions ($10,930 million, all attributable to Part B) were added to the SMI trust fund on December 31, 2009. These amounts are excluded from the premium income and general revenue income for calendar year 2010 (refer to note 1).
7. Delivery of benefit checks normally due January 3, 2016 occurred on December 31, 2015. Consequently, the SMI premiums withheld from the checks ($2,281 million, consisting of $2,097 million for Part B and $184 million for Part D) and the associated general revenue contributions ($5,446 million, all attributable to Part B) were added to the SMI trust fund on December 31, 2015. These amounts are excluded from the premium income and general revenue income for calendar year 2016 (refer to note 1).
Note: Totals do not necessarily equal the sums of rounded components.

