The idea that public borrowing places an intolerable burden on posterity is as old as the institution of public debt itself. But the debate over deficit-spending assumed an entirely new scope and import with the rise of the fiscal state in the early twentieth century, as governments assumed greater responsibilities with regard to public welfare and found themselves subject to a new kind of conflict concerning the uses and distribution of public income. In this context, the intergenerational argument against social welfare spending became an important tool in the fight against class redistribution. With a focus on American debates, this article provides a historical sociology of the idea that deficits constitute a burden on future generations, identifying the key historical turning points when this idea acquired new political resonance. In particular, the article investigates how we learned to blame baby boomers for the alleged ills of government deficit-spending and how this now ubiquitous motif of public discourse was reintroduced by the Virginia school public choice theorist James M. Buchanan and later refined by the chief proponent of generational accounting, Laurence Kotlikoff.