Republican lawmakers quickly seized on the milestone of a $40 trillion U.S. national debt to fault what they call “unaffordable socialist policies” and runaway federal spending. Their criticisms framed the ballooning figure as a consequence of Democratic programs and expansive government.
Economists and budget analysts, however, point to a different set of drivers: decades of tax cuts concentrated at the top, costly military engagements, and recent policy choices that reduced federal revenue. Many observers say those decisions — especially large tax reductions favored by Republican majorities and successive administrations — have been the primary contributors to the long-term rise in the debt.
“Whatever we think of debt and deficits, there is one point that should be very clear: It has been run up almost entirely due to Republican tax cuts and their inept management of the economy,” wrote Dean Baker, senior economist at the Center for Economic and Policy Research. Baker said he does not consider himself a deficit hawk, but that the pattern of tax policy and economic management leaves little doubt about the causes.
Nobel laureate Paul Krugman made a similar argument, noting that while the $40 trillion figure is not magically significant on its own, it highlights “the incredible irresponsibility” of recent administrations that enacted unfunded tax cuts favoring the wealthy and sanctioned billions in military spending — sometimes for programs critics describe as wasteful.
Analysts at the Center for American Progress and others have quantified the effect of those tax policies. Senior budget-policy officials estimate that tax cuts enacted under Presidents George W. Bush and Donald Trump accounted for a large share of the increase in the debt ratio since 2001. One analysis concluded those cuts were responsible for roughly 57% of the increase in the debt ratio since 2001, and a far larger share if one-time crisis costs tied to the Great Recession and the COVID-19 response are excluded.
Last year’s large tax package — signed by President Trump and widely seen as skewed toward high-income households and big corporations — will add billions more to projected deficits over the coming decade, analysts warn. At the same time, some tariff policies that were later invalidated by courts reduced expected federal revenue, accelerating the timing of the $40 trillion milestone.
Former Labor Secretary Robert Reich summed up a related critique: the wealthy receive the lion’s share of tax cuts and are also major recipients of interest payments on the national debt, creating a cycle that benefits those already advantaged.
The debt reached $40 trillion months earlier than forecasters had predicted, a timing partly blamed on lost revenue from policy moves and on recent tax measures. One widely cited figure attributes roughly an $11.6 trillion increase in the national debt to the period of the most recent administration’s terms.
Lawmakers on the left warned about downstream costs. Representative Chris Deluzio (D-PA) pointed out that interest on the debt now consumes more public dollars than even the military and Medicare, and he cautioned that current policies are leaving younger generations with a “colossal mess to clean up.”
Republicans, for their part, continue to frame the discussion around government spending programs and Democratic priorities, arguing for spending restraint and policy changes to curb future borrowing.
The debate over the $40 trillion mark underscores competing diagnoses about what most drives U.S. government borrowing: whether it is the growth of social programs, as some Republicans claim, or the cumulative effect of tax cuts, military spending, and other revenue-reducing policies, as many economists and progressive analysts contend. Both sides agree the figure is historically large; they disagree sharply on the causes and on the right remedies.
