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CBO Forecasts U.S. Population Flatlines by 2056 as Deaths Outnumber Births by 2030

With births projected to trail deaths from 2030, immigration becomes the swing factor in the outlook.

Overview

  • The 30-year projection shows the population rising from about 349 million in 2026 to 364 million in 2056 before declining thereafter.
  • Net immigration is expected to be the only source of growth after 2030, with the CBO warning that future laws and enforcement changes could significantly alter the path.
  • Stricter immigration enforcement, including measures funded in the 2025 Reconciliation Act, is estimated to reduce the population by roughly 320,000 over the next decade.
  • CBO lowers its long-run fertility assumption to about 1.53 births per woman and projects fewer births among women under 30 with modest increases among women over 30.
  • An aging population and slower labor-force growth pose budget pressures, with the CBO highlighting significant implications for Social Security and Medicare.