2001 OASDI Trustees Report
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VI. APPENDICES

A. HISTORY OF OASI AND DI TRUST FUND OPERATIONS

The Federal Old-Age and Survivors Insurance (OASI) Trust Fund was established on January 1, 1940, as a separate account in the United States Treasury. The Federal Disability Insurance (DI) Trust Fund, another separate account in the United States Treasury was established on August 1, 1956. All the financial operations of the OASI and DI programs are handled through these respective funds. The Board of Trustees1 is responsible for overseeing the financial operations of these funds. The following paragraphs describe the various components of trust fund income and outgo. The tables at the end of this section present the historical operations of the separate trust funds since their inception, as well as the operations of the combined trust funds during the period when they have co-existed.

The primary receipts of these two funds are amounts appropriated to each of them under permanent authority on the basis of contributions payable by workers, their employers, and individuals with self-employment income, in work covered by the OASDI program. All employees, and their employers, in covered employment are required to pay contributions with respect to their wages. Employees, and their employers, are also required to pay contributions with respect to cash tips, if the individual's monthly cash tips amount to at least $20. All self-employed persons are required to pay contributions with respect to their covered net earnings from self-employment. In addition to paying the required employer contributions on the wages of covered Federal employees, the Federal Government also pays amounts equivalent to the combined employer and employee contributions that would be paid on deemed wage credits attributable to military service performed after 1956 if such wage credits were covered wages.

In general, an individual's contributions, or taxes, are computed on wages or net earnings from self-employment, or both wages and net self-employment earnings combined, up to a specified maximum annual amount. The contributions are determined first on the wages and then on any net self-employment earnings, such that the total does not exceed the annual maximum amount. An employee who pays contributions on wages in excess of the annual maximum amount (because of employment with two or more employers) is eligible for a refund of the excess employee contributions.

The monthly benefit amount to which an individual (or his or her spouse and children) may become entitled under the OASDI program is based on the individual's taxable earnings during his or her lifetime. For almost all persons who first become eligible to receive benefits in 1979 or later, the earnings used in the computation of benefits are indexed to reflect increases in average wage levels.

The contribution, or tax, rates applicable under current law in each calendar year and the allocation of these rates between the OASI and DI Trust Funds are shown in table VI.A1.2 The maximum amount of earnings on which OASDI contributions are payable in a year, which is also the maximum amount of earnings creditable in that year for benefit-computation purposes, is called the contribution and benefit base. The contribution and benefit base for each year through 2001 is also shown in table VI.A1.

Table VI.A1.- Contribution and Benefit Base and Contribution Rates 
Calendar years
Contribution
and benefit base
Contribution rates (percent)
Employees and employers, each

Self-employed
OASDI
OASI
DI
OASDI
OASI
DI
1937-49
$3,000
1.000
1.000
-

-
-
-
1950
3,000
1.500
1.500
-

-
-
-
1951-53
3,600
1.500
1.500
-

2.2500
2.2500
-
1954
3,600
2.000
2.000
-

3.0000
3.0000
-
1955-56
4,200
2.000
2.000
-

3.0000
3.0000
-








1957-58
4,200
2.250
2.000
0.250

3.3750
3.0000
0.3750
1959
4,800
2.500
2.250
.250

3.7500
3.3750
.3750
1960-61
4,800
3.000
2.750
.250

4.5000
4.1250
.3750
1962
4,800
3.125
2.875
.250

4.7000
4.3250
.3750
1963-65
4,800
3.625
3.375
.250

5.4000
5.0250
.3750








1966
6,600
3.850
3.500
.350

5.8000
5.2750
.5250
1967
6,600
3.900
3.550
.350

5.9000
5.3750
.5250
1968
7,800
3.800
3.325
.475

5.8000
5.0875
.7125
1969
7,800
4.200
3.725
.475

6.3000
5.5875
.7125
1970
7,800
4.200
3.650
.550

6.3000
5.4750
.8250








1971
7,800
4.600
4.050
.550

6.9000
6.0750
.8250
1972
9,000
4.600
4.050
.550

6.9000
6.0750
.8250
1973
10,800
4.850
4.300
.550

7.0000
6.2050
.7950
1974
13,200
4.950
4.375
.575

7.0000
6.1850
.8150
1975
14,100
4.950
4.375
.575

7.0000
6.1850
.8150








1976
15,300
4.950
4.375
.575

7.0000
6.1850
.8150
1977
16,500
4.950
4.375
.575

7.0000
6.1850
.8150
1978
17,700
5.050
4.275
.775

7.1000
6.0100
1.0900
1979
22,900
5.080
4.330
.750

7.0500
6.0100
1.0400
1980
25,900
5.080
4.520
.560

7.0500
6.2725
.7775








1981
$29,700
5.350
4.700
0.650

8.0000
7.0250
0.9750
1982
32,400
5.400
4.575
.825

8.0500
6.8125
1.2375
1983
35,700
5.400
4.775
.625

8.0500
7.1125
.9375
1984 1
37,800
5.700
5.200
.500

11.4000
10.4000
1.0000
1985 1
39,600
5.700
5.200
.500

11.4000
10.4000
1.0000








1986 1
42,000
5.700
5.200
.500

11.4000
10.4000
1.0000
1987 1
43,800
5.700
5.200
.500

11.4000
10.4000
1.0000
1988 1
45,000
6.060
5.530
.530

12.1200
11.0600
1.0600
1989 1
48,000
6.060
5.530
.530

12.1200
11.0600
1.0600
1990
51,300
6.200
5.600
.600

12.4000
11.2000
1.2000








1991
53,400
6.200
5.600
.600

12.4000
11.2000
1.2000
1992
55,500
6.200
5.600
.600

12.4000
11.2000
1.2000
1993
57,600
6.200
5.600
.600

12.4000
11.2000
1.2000
1994
60,600
6.200
5.260
.940

12.4000
10.5200
1.8800
1995
61,200
6.200
5.260
.940

12.4000
10.5200
1.8800








1996
62,700
6.200
5.260
.940

12.4000
10.5200
1.8800
1997
65,400
6.200
5.350
.850

12.4000
10.7000
1.7000
1998
68,400
6.200
5.350
.850

12.4000
10.7000
1.7000
1999
72,600
6.200
5.350
.850

12.4000
10.7000
1.7000
2000
76,200
6.200
5.300
.900

12.4000
10.6000
1.8000








2001
80,400
6.200
5.300
.900

12.4000
10.6000
1.8000
2002 and later
(2)
6.200
5.300
.900

12.4000
10.6000
1.8000

1 In 1984 only, an immediate credit of 0.3 percent of taxable wages was allowed against the OASDI contributions paid by employees, which resulted in an effective contribution rate of 5.4 percent. The appropriations of contributions to the trust funds, however, were based on the combined employee-employer rate of 11.4 percent, as if the credit for employees did not apply. Similar credits of 2.7 percent, 2.3 percent, and 2.0 percent were allowed against the combined OASDI and Hospital Insurance (HI) contributions on net earnings from self-employment in 1984, 1985, and 1986-89, respectively. Beginning in 1990, self-employed persons are allowed a deduction, for purposes of computing their net earnings, equal to half of the combined OASDI and HI contributions that would be payable without regard to the contribution and benefit base. The OASDI contribution rate is then applied to net earnings after this deduction, but subject to the OASDI base.

2 Subject to automatic adjustment based on increases in average wages.

All contributions are collected by the Internal Revenue Service and deposited in the general fund of the Treasury. The contributions are immediately and automatically appropriated to the trust funds on an estimated basis. The exact amount of contributions received is not known initially because the OASDI and HI contributions and individual income taxes are not separately identified in collection reports received by the Internal Revenue Service. Periodic adjustments are subsequently made to the extent that the estimates are found to differ from the amounts of contributions actually payable as determined from reported earnings. Adjustments are also made to account for any refunds to employees (with more than one employer) who paid contributions on wages in excess of the contribution and benefit base.

Beginning in 1984, up to one-half of an individual's or couple's OASDI benefits was subject to Federal income taxation under certain circumstances. Effective for taxable years beginning after 1993, the maximum percentage of benefits subject to taxation was increased from 50 percent to 85 percent. The proceeds from taxation of up to 50 percent of benefits are credited to the OASI and DI Trust Funds in advance, on an estimated basis, at the beginning of each calendar quarter, with no reimbursement to the general fund for interest costs attributable to the advance transfers.3 Subsequent adjustments are made based on the actual amounts as shown on annual income tax records. The amounts appropriated from the general fund of the Treasury are allocated to the OASI and DI Trust Funds on the basis of the income taxes paid on the benefits from each fund.4

Another source of income to the trust funds is interest received on investments held by the trust funds. That portion of each trust fund which is not required to meet current expenditures for benefits and administration is invested, on a daily basis, primarily in interest-bearing obligations of the U.S. Government (including special public-debt obligations described below). Investments may also be made in obligations guaranteed as to both principal and interest by the United States, including certain Federally sponsored agency obligations that are designated in the laws authorizing their issuance as lawful investments for fiduciary and trust funds under the control and authority of the United States or any officer of the United States. These obligations may be acquired on original issue at the issue price or by purchase of outstanding obligations at their market price.

The Social Security Act authorizes the issuance of special public-debt obligations for purchase exclusively by the trust funds. The Act provides that the interest rate on new special obligations will be the average market yield, as of the last business day of a month, on all of the outstanding marketable U.S. obligations that are due or callable more than 4 years in the future. The rate so calculated is rounded to the nearest one-eighth of one percent and applies to new issues in the following month. Beginning January 1999, in calculating the average market yield rate for this purpose, the Treasury incorporates the yield to the call date when a callable bond's market price is above par.

Although the special issues cannot be bought or sold in the open market, they are nonetheless redeemable at all times at par value and thus bear no risk of fluctuations in principal value due to changes in interest rates. Just as in the case of marketable securities, all of the investments held by the trust funds are backed by the full faith and credit of the U.S. Government.

Income is also affected by provisions of the Social Security Act for (1) transfers between the general fund of the Treasury and the OASI and DI Trust Funds for any adjustments to prior payments for the cost arising from the granting of noncontributory wage credits for military service prior to 1957, according to periodic determinations; (2) annual reimbursements from the general fund of the Treasury to the OASI Trust Fund for any costs arising from the special monthly cash payments to certain uninsured persons-i.e., those who attained age 72 before 1968 and who generally are not eligible for cash benefits under other provisions of the OASDI program; and (3) the receipt of unconditional money gifts or bequests made for the benefit of the trust funds or any activity financed through the funds.

The primary expenditures of the OASI and DI Trust Funds are for (1) OASDI benefit payments, net of any reimbursements from the general fund of the Treasury for unnegotiated benefit checks, and (2) expenses incurred by the Social Security Administration and the Department of the Treasury in administering the OASDI program and the provisions of the Internal Revenue Code relating to the collection of contributions. Such administrative expenses include expenditures for construction, rental and lease, or purchase of office buildings and related facilities for the Social Security Administration. The Social Security Act does not permit expenditures from the OASI and DI Trust Funds for any purpose not related to the payment of benefits or administrative costs for the OASDI program.

The expenditures of the trust funds are also affected by (1) costs of vocational rehabilitation services furnished as an additional benefit to disabled persons receiving cash benefits because of their disabilities where such services contributed to their successful rehabilitation, and (2) the provisions of the Railroad Retirement Act which provide for a system of coordination and financial interchange between the Railroad Retirement program and the Social Security program. Under the latter provisions, transfers between the Railroad Retirement program's Social Security Equivalent Benefit Account and the trust funds are made on an annual basis in order to place each trust fund in the same position in which it would have been if railroad employment had always been covered under Social Security.

The net worth of facilities and other fixed capital assets is not carried in the statements of the operations of the trust funds presented in this report. This is because the value of fixed capital assets does not represent funds available for the payment of benefits or administrative expenditures, and therefore is not considered in assessing the actuarial status of the trust funds.

Table VI.A2.- Historical Operations of the OASI Trust Fund, Calendar Years 1937-2000 
[Amounts in billions]
Calendar
year
Income

Expenditures

Assets
Total1
Net
contri-
butions2
Taxa-
tion of
benefits
Net
inter-
est 3
Total
Benefit
pay-
ments 4
Admin-
istra-
tive
costs
RRB
inter-
change
Net
increase
during
year
Amount
at end
of year
Trust
Fund
ratio 5
1937
$0.8
$0.8
-
(6)

(6)
(6)
-
-

$0.8
$0.8
100
1938
.4
.4
-
(6)

(6)
(6)
-
-

.4
1.1
7,660
1939
.6
.6
-
(6)

(6)
(6)
-
-

.6
1.7
8,086













1940
.4
.3
-
(6)

$0.1
(6)
(6)
-

.3
2.0
2,781
1941
.8
.8
-
$0.1

.1
$0.1
(6)
-

.7
2.8
1,782
1942
1.1
1.0
-
.1

.2
.1
(6)
-

.9
3.7
1,737
1943
1.3
1.2
-
.1

.2
.2
(6)
-

1.1
4.8
1,891
1944
1.4
1.3
-
.1

.2
.2
(6)
-

1.2
6.0
2,025













1945
1.4
1.3
-
.1

.3
.3
(6)
-

1.1
7.1
1,975
1946
1.4
1.3
-
.2

.4
.4
(6)
-

1.0
8.2
1,704
1947
1.7
1.6
-
.2

.5
.5
(6)
-

1.2
9.4
1,592
1948
2.0
1.7
-
.3

.6
.6
$0.1
-

1.4
10.7
1,542
1949
1.8
1.7
-
.1

.7
.7
.1
-

1.1
11.8
1,487













1950
2.9
2.7
-
.3

1.0
1.0
.1
-

1.9
13.7
1,156
1951
3.8
3.4
-
.4

2.0
1.9
.1
-

1.8
15.5
698
1952
4.2
3.8
-
.4

2.3
2.2
.1
-

1.9
17.4
681
1953
4.4
3.9
-
.4

3.1
3.0
.1
-

1.3
18.7
564
1954
5.6
5.2
-
.4

3.7
3.7
.1
(6)

1.9
20.6
500













1955
6.2
5.7
-
.5

5.1
5.0
.1
(6)

1.1
21.7
405
1956
6.7
6.2
-
.5

5.8
5.7
.1
(6)

.9
22.5
371
1957
7.4
6.8
-
.6

7.5
7.3
.2
(6)

-.1
22.4
300
1958
8.1
7.6
-
.6

8.6
8.3
.2
$0.1

-.5
21.9
259
1959
8.6
8.1
-
.5

10.3
9.8
.2
.3

-1.7
20.1
212













1960
11.4
10.9
-
.5

11.2
10.7
.2
.3

.2
20.3
180
1961
11.8
11.3
-
.5

12.4
11.9
.2
.3

-.6
19.7
163
1962
12.6
12.1
-
.5

14.0
13.4
.3
.4

-1.4
18.3
141
1963
15.1
14.5
-
.5

14.9
14.2
.3
.4

.1
18.5
123
1964
16.3
15.7
-
.6

15.6
14.9
.3
.4

.6
19.1
118













1965
16.6
16.0
-
.6

17.5
16.7
.3
.4

-.9
18.2
109
1966
21.3
20.6
-
.6

19.0
18.3
.3
.4

2.3
20.6
96
1967
24.0
23.1
-
.8

20.4
19.5
.4
.5

3.7
24.2
101
1968
25.0
23.7
-
.9

23.6
22.6
.5
.4

1.5
25.7
103
1969
29.6
27.9
-
1.2

25.2
24.2
.5
.5

4.4
30.1
102













1970
32.2
30.3
-
1.5

29.8
28.8
.5
.6

2.4
32.5
101
1971
35.9
33.7
-
1.7

34.5
33.4
.5
.6

1.3
33.8
94
1972
40.1
37.8
-
1.8

38.5
37.1
.7
.7

1.5
35.3
88
1973
48.3
46.0
-
1.9

47.2
45.7
.6
.8

1.2
36.5
75
1974
54.7
52.1
-
2.2

53.4
51.6
.9
.9

1.3
37.8
68













1975
59.6
56.8
-
2.4

60.4
58.5
.9
1.0

-.8
37.0
63
1976
66.3
63.4
-
2.3

67.9
65.7
1.0
1.2

-1.6
35.4
54
1977
72.4
69.6
-
2.2

75.3
73.1
1.0
1.2

-2.9
32.5
47
1978
78.1
75.5
-
2.0

83.1
80.4
1.1
1.6

-5.0
27.5
39
1979
90.3
87.9
-
1.8

93.1
90.6
1.1
1.4

-2.9
24.7
30













1980
105.8
103.4
-
1.8

107.7
105.1
1.2
1.4

-1.8
22.8
23
1981
125.4
122.6
-
2.1

126.7
123.8
1.3
1.6

-1.3
21.5
18
1982
125.2
123.7
-
.8

142.1
138.8
1.5
1.8

.6
22.1
15
1983
150.6
138.3
-
6.7

153.0
149.2
1.5
2.3

-2.4
19.7
14
1984
169.3
164.1
$2.8
2.3

161.9
157.8
1.6
2.4

7.4
27.1
20













1985
184.2
177.0
3.2
1.9

171.2
167.2
1.6
2.3

7 8.7
35.8
24
1986
197.4
190.7
3.4
3.1

181.0
176.8
1.6
2.6

7 3.2
39.1
28
1987
210.7
202.7
3.3
4.7

187.7
183.6
1.5
2.6

23.1
62.1
30
1988
240.8
229.8
3.4
7.6

200.0
195.5
1.8
2.8

40.8
102.9
41
1989
264.7
250.2
2.4
12.0

212.5
208.0
1.7
2.8

52.2
155.1
59
1990
$286.7
$267.5
$4.8
$16.4

$227.5
$223.0
$1.6
$3.0

$59.1
$214.2
78
1991
299.3
272.6
5.9
20.8

245.6
240.5
1.8
3.4

53.7
267.8
87
1992
311.2
281.0
5.9
24.3

259.9
254.9
1.8
3.1

51.3
319.2
103
1993
323.3
290.9
5.3
27.0

273.1
267.8
2.0
3.4

50.2
369.3
117
1994
328.3
293.3
5.0
29.9

284.1
279.1
1.6
3.4

44.1
413.5
130













1995
342.8
304.6
5.5
32.8

297.8
291.6
2.1
4.1

45.0
458.5
139
1996
363.7
321.6
6.5
35.7

308.2
302.9
1.8
3.6

55.5
514.0
149
1997
397.2
349.9
7.4
39.8

322.1
316.3
2.1
3.7

75.1
589.1
160
1998
424.8
371.2
9.1
44.5

332.3
326.8
1.9
3.7

92.5
681.6
177
1999
457.0
396.4
10.9
49.8

339.9
334.4
1.8
3.7

117.2
798.8
201













2000
490.5
421.4
11.6
57.5

358.3
352.7
2.1
3.5

132.2
931.0
223

1 Includes payments from the general fund of the Treasury to the trust funds for (1) in 1947-51 and in 1966 and later, for costs of noncontributory wage credits for military service performed before 1957; (2) in 1971-82, for costs of deemed wage credits for military service performed after 1956; and (3) in 1968 and later, for costs of benefits to certain uninsured persons who attained age 72 before 1968. Differences in past year total income and sum of individual column amounts are due to these payments. OASI historical payments from the general fund of the Treasury may be found on the Internet at http://www.ssa.gov/OACT/STATS/table4a1.html.

2 Beginning in 1983, includes transfers from general fund of Treasury representing contributions that would have been paid on deemed wage credits for military service in 1957 and later, if such credits were considered to be covered wages.

3 Net interest includes net profits or losses on marketable investments. Beginning in 1967, administrative expenses are charged to the trust fund on an estimated basis, with a final adjustment, including interest, made in the following fiscal year. The amounts of these interest adjustments are included in net interest. For years prior to 1967, a description of the method of accounting for administrative expenses is contained in the 1970 Annual Report. Beginning in October 1973, the figures shown include relatively small amounts of gifts to the fund. Net interest for 1983-86 reflects payments from a borrowing trust fund to a lending trust fund for interest on amounts owed under the interfund borrowing provisions. During 1983-90, interest paid from the trust fund to the general fund on advance tax transfers is reflected. The amount shown for 1985 includes an interest adjustment of $88 million on unnegotiated checks issued before April 1985.

4 Beginning in 1966, includes payments for vocational rehabilitation services furnished to disabled persons receiving benefits because of their disabilities. Beginning in 1983, amounts are reduced by amount of reimbursement for unnegotiated benefit checks.

5 The "Trust fund ratio" column represents assets at the beginning of a year as a percentage of expenditures during the year. For years 1984-90, assets at the beginning of a year include January advance tax transfers.

6 Less than $50 million.

7 Reflects offset for repayment from the OASI Trust Fund of amounts borrowed from the DI and HI Trust Funds in 1982. The amount repaid in 1985 was $4.4 billion; in 1986, the amount was $13.2 billion.

Note: Totals do not necessarily equal the sums of rounded components.

Table VI.A3.- Historical Operations of the DI Trust Fund, Calendar Years 1957-2000 
[Amounts in billions]
Calendar
year
Income

Expenditures

Assets
Total 1
Net
contri-
butions2
Taxa-
tion of
benefits
Net
inter-
est 3
Total
Benefit
pay-
ments 4
Admin-
istra-
tive
costs
RRB
inter-
change
Net
increase
during
year
Amount
at end
of year
Trust
Fund
ratio 5
1957
$0.7
$0.7
-
(6)

$0.1
$0.1
(6)
-

$0.6
$0.6
100
1958
1.0
1.0
-
(6)

.3
.2
(6)
-

.7
1.4
249
1959
.9
.9
-
(6)

.5
.5
$0.1
(6)

.4
1.8
284













1960
1.1
1.0
-
$0.1

.6
.6
(6)
(6)

.5
2.3
304
1961
1.1
1.0
-
.1

1.0
.9
.1
(6)

.1
2.4
239
1962
1.1
1.0
-
.1

1.2
1.1
.1
(6)

-.1
2.4
206
1963
1.2
1.1
-
.1

1.3
1.2
.1
(6)

-.1
2.2
183
1964
1.2
1.2
-
.1

1.4
1.3
.1
(6)

-.2
2.0
159













1965
1.2
1.2
-
.1

1.7
1.6
.1
(6)

-.4
1.6
121
1966
2.1
2.0
-
.1

1.9
1.8
.1
(6)

.1
1.7
82
1967
2.4
2.3
-
.1

2.1
2.0
.1
(6)

.3
2.0
83
1968
3.5
3.3
-
.1

2.5
2.3
.1
(6)

1.0
3.0
83
1969
3.8
3.6
-
.2

2.7
2.6
.1
(6)

1.1
4.1
111













1970
4.8
4.5
-
.3

3.3
3.1
.2
(6)

1.5
5.6
126
1971
5.0
4.6
-
.4

4.0
3.8
.2
(6)

1.0
6.6
140
1972
5.6
5.1
-
.4

4.8
4.5
.2
(6)

.8
7.5
140
1973
6.4
5.9
-
.5

6.0
5.8
.2
(6)

.5
7.9
125
1974
7.4
6.8
-
.5

7.2
7.0
.2
(6)

.2
8.1
110













1975
8.0
7.4
-
.5

8.8
8.5
.3
(6)

-.8
7.4
92
1976
8.8
8.2
-
.4

10.4
10.1
.3
(6)

-1.6
5.7
71
1977
9.6
9.1
-
.3

11.9
11.5
.4
(6)

-2.4
3.4
48
1978
13.8
13.4
-
.3

13.0
12.6
.3
(6)

.9
4.2
26
1979
15.6
15.1
-
.4

14.2
13.8
.4
(6)

1.4
5.6
30













1980
13.9
13.3
-
.5

15.9
15.5
.4
(6)

-2.0
3.6
35
1981
17.1
16.7
-
.2

17.7
17.2
.4
(6)

-.6
3.0
21
1982
22.7
22.0
-
.5

18.0
17.4
.6
(6)

-.4
2.7
17
1983
20.7
18.0
-
1.6

18.2
17.5
.6
(6)

2.5
5.2
15
1984
17.3
15.9
$0.2
1.2

18.5
17.9
.6
(6)

-1.2
4.0
35













1985
19.3
17.2
.2
.9

19.5
18.8
.6
(6)

7 2.4
6.3
27
1986
19.4
18.4
.2
.8

20.5
19.9
.6
$0.1

7 1.5
7.8
38
1987
20.3
19.7
(6)
.6

21.4
20.5
.8
.1

-1.1
6.7
44
1988
22.7
22.0
.1
.6

22.5
21.7
.7
.1

.2
6.9
38
1989
24.8
24.0
.1
.7

23.8
22.9
.8
.1

1.0
7.9
38













1990
28.8
28.5
.1
.9

25.6
24.8
.7
.1

3.2
11.1
40
1991
30.4
29.1
.2
1.1

28.6
27.7
.8
.1

1.8
12.9
39
1992
31.4
30.1
.2
1.1

32.0
31.1
.8
.1

-.6
12.3
40
1993
32.3
31.2
.3
.8

35.7
34.6
1.0
.1

-3.4
9.0
35
1994
52.8
51.4
.3
1.2

38.9
37.7
1.0
.1

14.0
22.9
23













1995
56.7
54.4
.3
2.2

42.1
40.9
1.1
.1

14.6
37.6
55
1996
60.7
57.3
.4
3.0

45.4
44.2
1.2
(6)

15.4
52.9
83
1997
60.5
56.0
.5
4.0

47.0
45.7
1.3
.1

13.5
66.4
113
1998
64.4
59.0
.6
4.8

49.9
48.2
1.6
.2

14.4
80.8
133
1999
69.5
63.2
.7
5.7

53.0
51.4
1.5
.1

16.5
97.3
152













2000
77.9
71.1
.7
6.9

56.8
55.0
1.6
.2

21.1
118.5
171

1 Includes payments from the general fund of the Treasury to the trust funds for (1) in 1947-51 and in 1966 and later, for costs of noncontributory wage credits for military service performed before 1957 and (2) in 1971-82, for costs of deemed wage credits for military service performed after 1956. Differences in past year total income and sum of individual column amounts are due to these payments. DI historical payments from the general fund of the Treasury may be found on the Internet at http://www.ssa.gov/OACT/STATS/table4a2.html.

2 Beginning in 1983, includes transfers from general fund of Treasury representing contributions that would have been paid on deemed wage credits for military service in 1957 and later, if such credits were considered to be covered wages.

3 Net interest includes net profits or losses on marketable investments. Beginning in 1967, administrative expenses are charged to the trust fund on an estimated basis, with a final adjustment, including interest, made in the following fiscal year. The amounts of these interest adjustments are included in net interest. For years prior to 1967, a description of the method of accounting for administrative expenses is contained in the 1970 Annual Report. Beginning in July 1974, the figures shown include relatively small amounts of gifts to the fund. Net interest for 1983-86 reflects payments from a borrowing trust fund to a lending trust fund for interest on amounts owed under the interfund borrowing provisions. During 1983-90, interest paid from the trust fund to the general fund on advance tax transfers is reflected. The amount shown for 1985 includes an interest adjustment of $14.8 million on unnegotiated checks issued before April 1985.

4 Beginning in 1966, includes payments for vocational rehabilitation services furnished to disabled persons receiving benefits because of their disabilities. Beginning in 1983, amounts are reduced by amount of reimbursement for unnegotiated benefit checks.

5 The "Trust fund ratio" column represents assets at the beginning of a year as a percentage of expenditures during the year. For years 1984-90, assets at the beginning of a year include January advance tax transfers.

6 Less than $50 million.

7 Reflects offset for repayment from the OASI Trust Fund of amounts borrowed from the DI Trust Fund in 1982. An amount of $2.5 billion was repaid in each year 1985 and 1986.

Note: Totals do not necessarily equal the sums of rounded components.

Table VI.A4.- Historical Operations of the Combined OASI and DI Trust Funds, Calendar Years 1957-2000 
[Amounts in billions]
Calendar
year
Income

Expenditures

Assets
Total 1
Net
contri-
butions2
Taxa-
tion of
benefits
Net
inter-
est 3
Total
Benefit
pay-
ments 4
Admin-
istra-
tive costs
RRB
inter-
change
Net
increase
during
year
Amount
at end
of year
Trust
Fund
ratio 5
1957
$8.1
$7.5
-
$0.6

$7.6
$7.4
$0.2
(6)

$0.5
$23.0
298
1958
9.1
8.5
-
.6

8.9
8.6
.2
$0.1

.2
23.2
259
1959
9.5
8.9
-
.6

10.8
10.3
.2
.3

-1.3
22.0
215













1960
12.4
11.9
-
.6

11.8
11.2
.2
.3

.6
22.6
186
1961
12.9
12.3
-
.6

13.4
12.7
.3
.3

-.5
22.2
169
1962
13.7
13.1
-
.6

15.2
14.5
.3
.4

-1.5
20.7
146
1963
16.2
15.6
-
.6

16.2
15.4
.3
.4

(6)
20.7
128
1964
17.5
16.8
-
.6

17.0
16.2
.4
.4

.5
21.2
122













1965
17.9
17.2
-
.7

19.2
18.3
.4
.5

-1.3
19.8
110
1966
23.4
22.6
-
.7

20.9
20.1
.4
.5

2.5
22.3
95
1967
26.4
25.4
-
.9

22.5
21.4
.5
.5

3.9
26.3
99
1968
28.5
27.0
-
1.0

26.0
25.0
.6
.5

2.5
28.7
101
1969
33.3
31.5
-
1.3

27.9
26.8
.6
.5

5.5
34.2
103













1970
37.0
34.7
-
1.8

33.1
31.9
.6
.6

3.9
38.1
103
1971
40.9
38.3
-
2.0

38.5
37.2
.7
.6

2.4
40.4
99
1972
45.6
42.9
-
2.2

43.3
41.6
.9
.7

2.3
42.8
93
1973
54.8
51.9
-
2.4

53.1
51.5
.8
.8

1.6
44.4
80
1974
62.1
58.9
-
2.7

60.6
58.6
1.1
.9

1.5
45.9
73













1975
67.6
64.3
-
2.9

69.2
67.0
1.2
1.0

-1.5
44.3
66
1976
75.0
71.6
-
2.7

78.2
75.8
1.2
1.2

-3.2
41.1
57
1977
82.0
78.7
-
2.5

87.3
84.7
1.4
1.2

-5.3
35.9
47
1978
91.9
88.9
-
2.3

96.0
93.0
1.4
1.6

-4.1
31.7
37
1979
105.9
103.0
-
2.2

107.3
104.4
1.5
1.5

-1.5
30.3
30













1980
119.7
116.7
-
2.3

123.6
120.6
1.5
1.4

-3.8
26.5
25
1981
142.4
139.4
-
2.2

144.4
141.0
1.7
1.6

-1.9
24.5
18
1982
147.9
145.7
-
1.4

160.1
156.2
2.1
1.8

.2
24.8
15
1983
171.3
156.3
-
8.3

171.2
166.7
2.2
2.3

.1
24.9
14
1984
186.6
180.1
$3.0
3.4

180.4
175.7
2.3
2.4

6.2
31.1
21













1985
203.5
194.1
3.4
2.7

190.6
186.1
2.2
2.4

7 11.1
42.2
24
1986
216.8
209.1
3.7
3.9

201.5
196.7
2.2
2.7

7 4.7
46.9
29
1987
231.0
222.4
3.2
5.3

209.1
204.1
2.4
2.6

21.9
68.8
31
1988
263.5
251.8
3.4
8.2

222.5
217.1
2.5
2.9

41.0
109.8
41
1989
289.4
274.2
2.5
12.7

236.2
230.9
2.4
2.9

53.2
163.0
57













1990
315.4
296.1
5.0
17.2

253.1
247.8
2.3
3.0

62.3
225.3
75
1991
329.7
301.7
6.1
21.9

274.2
268.2
2.6
3.5

55.5
280.7
82
1992
342.6
311.1
6.1
25.4

291.9
286.0
2.7
3.2

50.7
331.5
96
1993
355.6
322.1
5.6
27.9

308.8
302.4
3.0
3.4

46.8
378.3
107
1994
381.1
344.7
5.3
31.1

323.0
316.8
2.7
3.5

58.1
436.4
117













1995
399.5
359.0
5.8
35.0

339.8
332.6
3.1
4.1

59.7
496.1
128
1996
424.5
378.9
6.8
38.7

353.6
347.1
3.0
3.6

70.9
567.0
140
1997
457.7
406.0
7.9
43.8

369.1
362.0
3.4
3.7

88.6
655.5
154
1998
489.2
430.2
9.7
49.3

382.3
375.0
3.5
3.8

107.0
762.5
171
1999
526.6
459.6
11.6
55.5

392.9
385.8
3.3
3.8

133.7
896.1
194













2000
568.4
492.5
12.3
64.5

415.1
407.6
3.8
3.7

153.3
1,049.4
216

1 Includes payments from the general fund of the Treasury to the trust funds for (1) in 1947-51 and in 1966 and later, for costs of noncontributory wage credits for military service performed before 1957; (2) in 1971-82, for costs of deemed wage credits for military service performed after 1956; and (3) in 1968 and later, for costs of benefits to certain uninsured persons who attained age 72 before 1968. Differences in past year total income and sum of individual column amounts are due to these payments. OASDI historical payments from the general fund of the Treasury may be found on the Internet at http://www.ssa.gov/OACT/STATS/table4a3.html.

2 Beginning in 1983, includes transfers from general fund of Treasury representing contributions that would have been paid on deemed wage credits for military service in 1957 and later, if such credits were considered to be covered wages.

3 Net interest includes net profits or losses on marketable investments. Beginning in 1967, administrative expenses are charged to the trust funds on an estimated basis, with a final adjustment, including interest, made in the following fiscal year. The amounts of these interest adjustments are included in net interest. For years prior to 1967, a description of the method of accounting for administrative expenses is contained in the 1970 Annual Report. Beginning in October 1973, the figures shown include relatively small amounts of gifts to the funds. Net interest for 1983-86 reflects payments from a borrowing trust fund to a lending trust fund for interest on amounts owed under the interfund borrowing provisions. During 1983-90, interest paid from the trust funds to the general fund on advance tax transfers is reflected. The amount shown for 1985 includes an interest adjustment of $102.8 million on unnegotiated checks issued before April 1985.

4 Beginning in 1966, includes payments for vocational rehabilitation services furnished to disabled persons receiving benefits because of their disabilities. Beginning in 1983, amounts are reduced by amount of reimbursement for unnegotiated benefit checks.

5 The "Trust fund ratio" column represents assets at the beginning of a year as a percentage of expenditures during the year. For years 1984-90, assets at the beginning of a year include January advance tax transfers.

6 Less than $50 million.

7 Reflects offset for repayment from the OASI Trust Fund of amounts borrowed from the HI Trust Fund in 1982. The amount repaid in 1985 was $1.8 billion; in 1986, the amount was $10.6 billion.

Note: Totals do not necessarily equal the sums of rounded components.


1 The Board is composed of six members, four of whom serve automatically by virtue of their positions in the Federal Government: the Secretary of the Treasury, who is the Managing Trustee, the Secretary of Labor, the Secretary of Health and Human Services, and the Commissioner of Social Security. The other two members are appointed by the President and confirmed by the Senate to serve as public representatives: John L. Palmer and Thomas R. Saving are currently serving 4-year terms that began on October 28, 2000.

2 The contribution rates for the Hospital Insurance (HI) program, and for the OASDI and HI programs combined, are shown in table VI.E1.

3 The additional tax revenues resulting from the increase to 85 percent are transferred to the HI Trust Fund.

4 A special provision applies to benefits paid to nonresident aliens. Under Public Law 103-465, effective for taxable years beginning after 1994, a flat-rate tax, usually 25.5 percent, is withheld from the benefits before they are paid and, therefore, remains in the trust funds. From 1984 to 1994 the flat-rate tax that was withheld was usually 15 percent.


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