How much would faster productivity growth reduce federal debt?
Core argument: A permanent 0.5 pp increase in annual total factor productivity growth would lower publicly held federal debt after 30 years by 39% of GDP relative to CBO's extended baseline, offsetting roughly half of the projected rise.
[In the Base Case], faster economic growth [improves the federal budget and debt outlook] through four channels. First, [higher] incomes increase federal revenue, [while] the progressive tax system [modestly] raises revenue relative to GDP. CBO [estimates] that a [permanent] 0.5 pp increase in annual TFP growth would raise revenue after [30 years] by 0.14% of GDP. Second, [although] faster growth increases [some] federal spending, spending rises [more slowly] than GDP, [reducing noninterest outlays] relative to GDP. Under our [assumptions], discretionary spending falls from 6.1% of GDP in 2025 to 4.5% in 2056. Third, because faster growth does not [change the stock of] existing debt, that debt becomes smaller relative to GDP. Fourth, [stronger] growth generally raises interest rates, increasing the [cost] of new borrowing and [refinancing] existing debt. This represents a partial offset to the [fiscal gains]. [On balance], additional annual TFP growth of 0.5 pp would lower publicly held federal debt after [30 years] by 39% of GDP relative to CBO’s extended baseline. CBO’s extended baseline shows federal debt rising from 101% of GDP in 2026 to 175% in three decades, so this hypothesized increase in growth would offset roughly half of that projected rise.


