
As Social Security’s money gap widens, the easiest place for Congress to “find” cash is the part of the budget that must be voted on each year — and that almost always means defense.
Story Snapshot
- Social Security’s trust funds are on track to run short in the early 2030s, triggering automatic benefit cuts if Congress does nothing.
- Social Security already adds tens of billions per year to the federal deficit, shrinking room for other programs.
- Mandatory spending like Social Security runs on autopilot, while defense must fight for a shrinking slice of the budget each year.
- Lawmakers can still avoid deep defense cuts, but only by raising taxes, trimming benefits, or both — choices voters of all stripes will feel.
Social Security’s math problem is no longer far off
Social Security’s own trustees now say the program’s main trust funds will run short of money in the early to mid 2030s, not decades from now. If Congress does nothing, the combined Old-Age, Survivors, and Disability Insurance funds are projected to be depleted around 2034, at which point only about 83% of scheduled benefits could be paid. Other expert reviews put the long-term funding gap at roughly 3.5% to 4.4% of the payroll tax base, which means the program’s promises are larger than its dedicated income.
Independent budget analysts estimate this shortfall at about 1.3% of the whole economy, measured as gross domestic product. That may sound small, but 1.3% of today’s economy equals roughly $388 billion per year. For older Americans and people with disabilities who rely on monthly checks, the stakes are huge. If nothing changes before the trust fund runs dry, automatic cuts of around 19% to 23% would hit every beneficiary, including today’s retirees, regardless of party or income.
Mandatory programs squeeze the rest of the budget
The federal budget is split between “mandatory” programs, like Social Security, and “discretionary” programs, like defense, that must be approved each year. Mandatory spending is set by permanent law, so it runs on autopilot unless Congress passes new laws to change benefit formulas or eligibility. Social Security is the largest of these programs and is almost entirely mandatory spending. Over time, mandatory programs have grown from about one-quarter of federal spending to about two-thirds, driven by an aging population and rising benefit costs.
Because mandatory programs keep paying based on their legal rules, they do not get trimmed in the annual budget fights unless lawmakers rewrite those rules. That leaves only the remaining 25% to 35% of spending — mostly defense, border security, education, and research — on the chopping block when deficits rise. Analysts warn that Social Security’s growing gap has already forced the government to raise extra money outside the program to pay full benefits, and that this extra need will jump sharply by 2032. In plain terms, when the autopilot bill goes up, the pilot’s choices get harder.
Social Security already adds to yearly deficits
Social Security used to collect more in payroll taxes than it paid out, building up its trust funds. That changed around 2010, when its main retirement fund began running yearly cash deficits. The program ran surpluses for almost 40 years, but since 2021 it has paid out more than it brought in, forcing the rest of the government to cover the difference. Analysts note that the gap was tens of billions of dollars at first and is projected to rise toward hundreds of billions in the early 2030s.
One recent review found that in 2026 Social Security’s retirement fund is expected to pay about $207 billion more in benefits than it receives in dedicated revenue. That extra money must come from borrowing or from taxes that could otherwise pay for defense or other programs. Heritage Foundation and other groups, using different timeframes and assumptions, describe total future shortfalls in the tens of trillions of dollars. The exact number is debated, but the direction is not: the program’s costs are outpacing its income, and the rest of the budget has to make up the difference.
Will defense take the hit when the bill comes due?
The claim that “defense must pay” springs from simple budget math, not from a formal law. Social Security, Medicare, and Medicaid are mandatory, so their spending keeps going unless Congress changes benefit rules. Defense, by contrast, is funded through annual appropriations, and lawmakers “spend considerable time debating” those bills each year. As mandatory costs climb, pressure grows to hold down total deficits, and the spotlight naturally turns to the 25% or so of spending that is still up for annual negotiation — including the Pentagon.
History suggests, however, that Congress does not always solve Social Security shortfalls by slashing defense. Past debates have often ended with some mix of tax increases, benefit tweaks, or raising the cap on wages subject to the payroll tax. Experts from both left-leaning and right-leaning groups agree lawmakers have three basic levers: raise more revenue, trim benefits, or change the broader deficit path so both defense and domestic programs face only modest restraint. What is different now is the scale of the gap and the level of public distrust in Washington’s willingness to tackle it honestly.
Shared frustrations with an “autopilot” government
For many conservatives, Social Security’s funding hole looks like another result of decades of overspending and of politicians ducking hard choices about entitlements and debt. For many liberals, it looks like proof that the government has protected wealthy taxpayers and defense contractors while leaving ordinary retirees and workers to worry about their futures. Both sides see a system where large chunks of spending are locked in by old laws, while elected officials fight over the shrinking part they can still move — often more to please lobbyists than to fix long-term problems.
Analysts warn that as mandatory programs grow and deficits pile up, the space for true policymaking shrinks. The rise of “autopilot” spending means key choices about who wins and who loses are made long before most voters know what is happening. That fuels anger at a perceived “deep state” of budget rules and interest groups that seems to run the country whether Republicans or Democrats are in charge. The coming Social Security crunch will test whether Congress can break that pattern by facing the arithmetic head-on — and by being clear with the public about what it will mean for taxes, benefits, and the size of the military.
Sources:
19fortyfive.com, gao.gov, democrats-budget.house.gov, congress.gov, govfacts.org, cato.org, taxpolicycenter.org, bipartisanpolicy.org, mercatus.org, pgpf.org, usafacts.org, crr.bc.edu, brookings.edu













