This chapter presents the estimates and measures of trust fund financial adequacy for the short-range period (2024 through 2033) first, followed by estimates and measures of actuarial status for the long-range period (2024 through 2098). Summary measures are also provided for trust fund status over the infinite horizon. As described in chapter II of this report, these estimates depend upon a broad set of demographic, economic, and programmatic factors. This chapter presents estimates under three sets of assumptions to show a wide range of possible outcomes, because assumptions related to these factors are subject to uncertainty. The intermediate set of assumptions, designated as alternative II, reflects the Trustees’ best estimate of future experience; the low-cost alternative I is significantly more optimistic and the high-cost alternative III is significantly more pessimistic for the trust funds’ future financial outlook. The tables of this report show the intermediate estimates first, followed by the low-cost and high-cost estimates. Chapter V describes these three sets of assumptions, along with the actuarial methods used to produce the estimates. Appendix D and appendix E present two additional methods to illustrate the uncertainty of the projections. Appendix D presents sensitivity analyses of the effects of variation in individual factor s and appendix E presents probability distributions generated by a stochastic model.The Trustees consider the trust funds to be solvent at any point in time if the funds can pay scheduled benefits in full on a timely basis. A standard measure for assessing solvency is the “trust fund ratio,” which is the reserves in a fund at the beginning of a year (not including advance tax transfers) expressed as a percentage of the cost during the year. A positive trust fund ratio indicates that the trust fund was solvent at the end of the prior year. The trust fund ratio represents the proportion of a year’s cost which the reserves available at the beginning of that year can cover. The Trustees assume that a trust fund ratio of 100 percent of annual program cost provides a reasonable “contingency reserve.” Maintaining a reasonable contingency reserve is important because the trust funds do not have borrowing authority. After reserves are depleted, the trust funds would be unable to pay scheduled benefits in full on a timely basis if annual revenue were less than annual cost. Unexpected events, such as severe economic recessions, can quickly diminish reserves. In such cases, a reasonable contingency reserve can maintain the ability to pay scheduled benefits while giving lawmakers time to address possible changes to the program.The test of short-range financial adequacy applies to the OASI and DI Trust Funds individually and combined on a hypothetical basis.^{1}If the estimated trust fund ratio is at least 100 percent at the beginning of the projection period, the test requires that it remain at or above 100 percent throughout the 10-year period. If the ratio is initially less than 100 percent, then it must reach at least 100 percent within 5 years (without reserve depletion at any time during this period) and then remain at or above 100 percent throughout the remainder of the 10-year period. This test is applied using the estimates based on the intermediate assumptions. If either trust fund fails this test, then program solvency in the next 10 years is in question, and lawmakers should take prompt action to improve short-range financial adequacy.This subsection presents projections, based on the assumptions described in chapter V, of the operations and financial status of the OASI Trust Fund for the period 2024 through 2033. These estimates assume that there are no further changes in the statutory provisions and regulations under which the OASDI program currently operates beyond the changes since last year’s report indicated in section III.B.^{2}Estimates of the OASI Trust Fund operations presented in table IV.A1 indicate that the asset reserves of the OASI Trust Fund are projected to decrease in years 2024 through 2033 under all three sets of assumptions. Under the low-cost assumptions, asset reserves remain positive through the end of the short-range period, but under the intermediate and high-cost assumptions, asset reserves become depleted in the fourth quarter of 2033 and the fourth quarter of 2031, respectively. Trust fund ratios are similarly projected to decline throughout the 10-year projection period under all three sets of assumptions. See figure IV.A1 for an illustration of these results.

The OASI Trust Fund reserves become depleted in the fourth quarter of 2033 and the fourth quarter of 2031 under the intermediate and high-cost assumptions, respectively. For any period during which reserves would be depleted, scheduled benefits could not be paid in full on a timely basis, income from taxing benefits would be less than would apply to scheduled benefits, and interest on trust fund reserves would be negligible. Appendix A presents a detailed description of the components of income and cost, along with complete historical values.

Includes reimbursements from the General Fund of the Treasury to the OASI Trust Fund for: (1) the cost of payroll tax credits provided to employees in 1984 and self-employed persons in 1984-89 by Public Law 98-21; and (2) payroll tax revenue forgone under the provisions of Public Laws 111-147, 111-312, 112-78, and 112-96. Also includes transfers of a portion of proceeds from repayments of loans authorized under Public Law 116-136.

Figure IV.A1.—Short-Range OASI and DI Trust Fund Ratios The estimated income shown in table IV.A1 increases annually under each set of assumptions throughout the short-range projection period, with the exception of a small decrease in 2025 for the high-cost alternative. The estimated increases in income result primarily from the projected increases in OASDI taxable payroll. Employment increases in years 2024 through 2033 for all three alternatives, with the exception of small decreases in covered employment in 2024 and 2025 for the high-cost alternative: the number of covered workers increases under alternatives I, II, and III from 183 million during calendar year 2023 to about 194 million, 190 million, and 186 million, respectively, in 2033.^{3}The total annual amount of taxable payroll increases in years 2024 through 2033 for each alternative. Total taxable payroll increases from $9,616 billion in 2023 to $17,962 billion, $15,062 billion, and $13,022 billion in 2033, on the basis of alternatives I, II, and III, respectively.^{4}These increases in taxable payroll are due primarily to: (1) projected increases in employment levels as the working-age population increases; (2) trend increases in average earnings in covered employment (reflecting both real growth and price inflation); (3) increases in the contribution and benefit base under the automatic-adjustment provisions; and (4) growth in employment and average earnings.Rising OASI cost from 2023 through 2033 reflects automatic benefit increases each year after initial benefit eligibility and increases each year for those becoming newly eligible based on rising average earnings levels, as well as the upward trend in the number of beneficiaries. The steady growth in the number of OASI beneficiaries in the past and the expected future growth result both from the aging of the baby-boom generation and from the increase in the proportion of the baby-boom generation that is insured for benefits, relative to earlier lower-birth-rate generations.Table IV.A2 shows the projected operations and financial status of the DI Trust Fund during calendar years 2024 through 2033 under the three sets of assumptions, together with values for actual experience during 2019 through 2023. For 2023, non-interest income was higher than DI cost. Non-interest income increases generally throughout the short-range projection period under each alternative, due to most of the same factors described previously for the OASI Trust Fund beginning on page 46. DI cost grows significantly over the period under each alternative. Under the intermediate and low-cost assumptions, DI reserves are significantly higher at the end of 2033. Under the high-cost assumptions, DI reserves grow to a somewhat higher level at the end of 2033.

Cost^{b} Asset Reserves^{b}

Appendix A presents a detailed description of the components of income and cost, along with complete historical values.

Includes reimbursements from the General Fund of the Treasury to the DI Trust Fund for: (1) the cost of payroll tax credits provided to employees in 1984 and self-employed persons in 1984-89 by Public Law 98-21; and (2) payroll tax revenue forgone under the provisions of Public Laws 111-147, 111-312, 112‑78, and 112-96.

For the future, DI cost is projected to increase in part due to increases in average benefit levels resulting from: (1) automatic benefit increases and (2) projected increases in the amounts of average monthly earnings on which benefits are based. Future changes in DI cost also reflect changes in the number of DI beneficiaries in current-payment status. In 2023, the number of DI beneficiaries in current-payment status continued the declining trend of the prior nine years. Under the intermediate assumptions, that number of DI beneficiaries is projected to drop further to a low point at the end of 2024, then increase to a level of about 9 million at the end of 2033. The rate of increase after 2024 is much slower than was experienced on average from 1990 to 2010, when the population with the highest disability prevalence rates was growing rapidly due to the aging of the baby-boom generation. See section V.C.5 for further details.Table IV.A3 shows the projected operations and status of the combined OASI and DI Trust Funds for calendar years 2024 through 2033 under the three alternatives, together with actual experience in 2019 through 2023. Income and cost for the OASI Trust Fund represent over 80 percent of the corresponding amounts for the combined OASI and DI Trust Funds. Under the intermediate and low-cost assumptions, the combined OASI and DI Trust Funds would have sufficient financial resources to pay all scheduled benefits through the end of the short-range period, although it is important to note that under current law, one trust fund cannot share financial resources with another trust fund. Under the high-cost assumptions, combined OASI and DI trust fund reserves deplete in the second quarter of 2032. The combined OASI and DI Trust Funds do not satisfy the test of short-range financial adequacy because under the intermediate assumptions, trust fund reserves drop below 100 percent of annual cost during 2029, to a trust fund ratio of 84 percent at the beginning of 2030, and remain below 100 percent for the remainder of the short-range period.

Cost^{b} Asset Reserves^{b} 145<