Social Security’s $5.1 Trillion Debt Contribution
How to calculate Social Security’s contribution to deficits and debt
The release of the annual Social Security Trustees report has once again focused attention on the program’s projected trust fund exhaustion date, now just six years away. But that emphasis on trust fund solvency perpetuates a common misconception: that Social Security has accumulated assets set aside to pay promised benefits and that its financing challenges are a future problem.
In reality, Social Security is already contributing to federal deficits and debt today. In 2026 alone, Social Security is projected to add roughly $328 billion to federal deficits—a figure rarely cited in discussions of the program’s finances.
That estimate reflects more than the program’s annual cash-flow shortfall. It also incorporates the interest costs associated with the debt Social Security has added to the federal balance sheet since the program began running cash-flow deficits in 2010. To capture Social Security’s full impact on the federal budget, we developed a comprehensive approach that first calculates the program’s annual contribution to deficits, excluding intragovernmental transfers, and then adds the interest costs associated with the cumulative debt those deficits have generated. Under this approach, Social Security’s contribution to the deficit in 2026 includes about $52 billion in interest costs.
The Congressional Budget Office (CBO) does not currently publish a measure of Social Security’s debt contribution that accounts for the interest costs of financing the program’s cash-flow deficits. To fill that gap, we are publishing our methodology for calculating these interest costs and Social Security’s full contribution to federal deficits and debt.
How Social Security Adds to Deficits and Debt Already
Social Security is a pay-as-you-go program, largely financing today’s benefits from payroll tax revenues collected from today’s workers. Between 1983 and 2009, tax revenues exceeded benefit payments, generating about $3 trillion in cumulative cash flow surpluses. Congress did not save these surpluses for future retirees; instead, it spent them on other programs. In exchange, the Treasury credited the trust fund with special-issue Treasury securities—promises to repay the program (IOUs) when it would begin running cash-flow deficits.
Importantly, these surpluses likely didn’t improve the government’s overall fiscal position and may have increased publicly held debt by giving Congress room to increase spending and cut taxes elsewhere. Since 2010, when Social Security began running cash-flow deficits, the program has relied partially on redeeming those IOUs and the associated interest. Those payments have been financed through borrowing from the public, as Treasury has repaid the Social Security program by issuing new bonds.
As a result, from 2010 through 2025, OASI’s annual cash-flow deficits added over $1.5 trillion to federal debt, including associated interest costs on the accumulated deficits. Absent reform, the program is projected to add another $3.6 trillion between 2026 and the trust fund’s exhaustion date in 2032, bringing Social Security’s total contribution to federal debt to roughly $5.1 trillion over this period (see chart below).
Measure Cash-Flow Effects, not Trust Fund Solvency
The annual Trustees report encourages policymakers and the public to focus on a single date: the year the trust fund runs out. But trust fund accounting obscures a more important reality. Social Security is already adding to federal deficits and debt today, and those contributions will continue to grow long before the trust fund is exhausted.
Measuring Social Security’s impact through annual cash flows and the debt they generate provides a clearer picture of the program’s fiscal consequences than assessing the trust fund balance. By that measure, Social Security has already added more than $1.5 trillion to federal debt since 2010 and is projected to add another $3.6 trillion by 2032.
Policymakers should assess not only whether a proposal improves trust fund solvency, but also whether it reduces the program’s contribution to federal deficits and debt. To facilitate that analysis, the Cato Social Security Model estimates the annual effects of reform proposals on Social Security’s cash-flow balances, in addition to trust fund balances. Doing so can shift the debate away from accounting conventions and toward the program’s real impact on the nation’s fiscal outlook.