The 2026 Medicare Trustees Report projects Hospital Insurance trust fund depletion in the second quarter of 2033, one quarter earlier than last year's estimate. The 75-year actuarial deficit widened to 0.56% of taxable payroll from 0.42%, a 33% single-year deterioration.
Closing that gap from January 2026 would have taken a 12% immediate cut to scheduled HI benefits or a payroll tax increase from 2.90% to 3.46%. Neither was enacted, and the number that moves is the one Medicare Advantage benchmarks are built on.
Key Takeaways
- The 75-year HI deficit widened from 0.42% to 0.56% of taxable payroll in one year, a 0.14 point move that is large by the standards of this measure.
- At depletion, HI income covers roughly 89% of scheduled costs, triggering an automatic 11% cut to hospitals, skilled nursing facilities, home health, and hospice, rising to 16% by 2040.
- MA-related expenditures within the Part A fund are projected to exceed FFS expenditures within that fund by 2028, a structure the fund was never designed around.
- The CMS Chief Actuary's alternative scenario puts the shortfall at 1.38% of taxable payroll against the 0.56% baseline, on a different assumption about productivity adjustments.
- Medicare Advantage now covers 51% of beneficiaries, projected to 56% by 2035, while FFS-to-MA migration slows from 1% to 5% a year to under 1%.
What Moved in the 2026 Report
The deficit is a slow-moving measure, which is what makes a 33% single-year change worth reading closely.
The Trustees itemize the drivers in the technical supplement: higher projected Medicare Advantage costs, certain provider payment adjustments, and the One Big Beautiful Bill Act passed in 2026, whose provisions the modeling now reflects. The depletion date moved one quarter, from the third to the second of 2033, and the prior report had already moved earlier than the one before it.
The underlying mechanism has not changed. HI income, principally the 2.90% payroll tax plus a share of income taxes on Social Security benefits, is growing more slowly than HI expenditures. The report projects annual HI deficits at 0.45% of taxable payroll in 2033, rising to a 0.71% peak in 2043 before moderating to 0.35% by 2100. The 2043 peak is the decade in which the full baby boom cohort sits inside the program.
Depletion is not a shutdown. The fund simply cannot pay out more than it takes in that period, and at 2033 income would cover approximately 89% of scheduled HI costs. The automatic result is an 11% reduction in payments to hospitals, skilled nursing facilities, home health agencies, and hospice providers, with no congressional action required, widening to 16% by 2040.
Why the HI Clock Runs Through MA Bids
The transmission is direct, and it runs through a number MA plan actuaries do not set.
CMS sets Medicare Advantage benchmarks as a percentage of projected per-capita FFS Medicare spending in each county, adjusted for demographics and risk. The benchmark caps what CMS pays, and bids below it generate the rebate dollars that fund supplemental benefits. Every part of the MA pricing chain, bid development through benefit design through multi-year margin, is calibrated to an FFS baseline that now carries an explicit solvency clock.
The congressional toolkit for HI pressure is provider payment rates, eligibility, and cost sharing. The first of those compresses FFS spending, which is the benchmark input. A 5% across-the-board reduction in Medicare inpatient payment rates lowers benchmarks in every county, and a plan that entered the contract year bidding close to benchmark absorbs the revenue reduction with no in-year adjustment mechanism outside the filing cycle. An 11% automatic reduction at depletion is that effect at more than double the size, arriving on a date the Trustees have already published.
The composition of the fund has shifted underneath this. MA covers 51% of beneficiaries, projected to 56% by 2035, though annual FFS-to-MA migration slows from the 1% to 5% range of the past decade to under 1% from 2026 to 2035. More consequentially, MA-related expenditures within the Part A trust fund are projected to exceed FFS expenditures within that fund by 2028. The fund was architected around a predominantly FFS population, and the crossover complicates the standard reading that MA growth is simply a more efficient use of trust fund resources.
Near-term MA pressure is already visible in three million beneficiaries facing forced disenrollment in 2026 and in the 2027 rate reversal. The Trustees Report adds the layer beneath both: the baseline setting 2028, 2029, and 2030 benchmarks is itself under documented strain.
The Baseline Assumes Congress Does Something It Has Not Done
The 0.56% figure rests on an assumption the CMS Office of the Actuary publishes a second set of numbers to qualify.
Current law requires annual reductions in Medicare payment rate growth tied to economy-wide productivity gains. The Trustees baseline assumes those reductions execute as written across the full 75-year projection. The Chief Actuary's alternative scenario phases them down from 2028, on the historical pattern that Congress modifies or overrides scheduled Medicare payment cuts as they approach. The Sustainable Growth Rate formula is the reference case: overridden annually for 17 years before MACRA replaced it in 2015, absorbing roughly $170 billion above what the formula required.
The two scenarios diverge by more than any legislative change currently under discussion. The alternative puts the 75-year HI shortfall at 1.38% of taxable payroll against 0.56%, and total Medicare spending at 9.8% of GDP by 2100 against 7.5%. Closing the alternative gap would take a payroll tax increase of 1.4 percentage points, from 2.90% to roughly 4.30%, or a spending reduction near 25% from scheduled benefit levels.
The alternative is not labeled pessimistic. It is the Chief Actuary's illustration of what the cost path looks like if productivity adjustment execution follows congressional behavior rather than statutory text, and the gap between 0.56% and 1.38% is the range of professional judgment about modeling political execution risk over 75 years.
That range is the problem for anyone anchoring to this report. An MA actuary projecting benchmark compression, or a plan sponsor coordinating retiree medical benefits against Medicare as primary payer past 2033, is choosing between two official federal actuarial estimates that differ by a factor of more than two, on an assumption about legislative behavior that neither can settle.
Further Reading
- Medicare Advantage in 2026: What Actuaries Need to Know About the Market Shakeup: comprehensive analysis of V28 risk adjustment, forced disenrollments, benefit reductions, and star ratings for health actuaries navigating the current MA market contraction.
- CMS 2027 Medicare Advantage Rate Reversal: Actuarial Implications for Plan Pricing: how the 2027 advance notice rate methodology affected benchmark calculations and what plan actuaries needed to model for 2027 bid development.
- The KFF Medicare Advantage Benefits and Premiums Paradox in 2026: analysis of why MA plans simultaneously reduced supplemental benefits and maintained low premiums, and the margin management dynamics driving that pattern.
- Medicare Advantage Plan Exits: 3 Million Disenrollments and the Actuarial Fallout: the 2026 MA plan exit wave and its implications for enrollment assumption stability in multi-year financial projections.
- Medicare Part D 2026 Redesign: First-Year Data on the IRA's Cost-Sharing Restructuring: first-year outcomes from the Part D catastrophic liability restructuring and what the numbers mean for plan actuaries modeling SMI cost trajectories.
- D-SNP Enrollment Triples: Medicare Advantage Carrier Strategy in the Dual-Eligible Market: how carriers are using Dual Eligible Special Needs Plan expansion as a growth lever inside a contracting broader MA market, and the risk stratification challenges for actuaries.
Sources
- CMS: 2026 Medicare Trustees Report (Office of the Actuary, Centers for Medicare and Medicaid Services)
- Committee for a Responsible Federal Budget: Analysis of the 2026 Medicare Trustees Report (June 2026)
- Bipartisan Policy Center: What Is in the 2026 Medicare Trustees Report?
- Social Security Administration: 2026 Trustees Report Summary
- American Action Forum: Highlights of the 2026 Social Security and Medicare Trustees Reports
- Georgetown University Medicare Policy Initiative: Beyond Insolvency: The Bigger Picture of Medicare's 2026 Financial Outlook
- KFF: FAQs on Medicare Financing and Trust Fund Solvency
- CMS: Trustees Report and Trust Funds data portal