How much would modestly higher Treasury yields add to federal debt?
Core argument: If the 10-year Treasury yield averaged 4.4% instead of the Congressional Budget Office's projected 4.1% in 2025 falling to 3.8% by 2031, with other Treasury yields rising equally, the analysis estimates an additional $1.8 trillion in debt over the decade.
In its current law projections, the Congressional Budget Office estimates the 10-year yield will average 4.1% in 2025 and fall gradually to 3.8% by 2031. If 10-year yields were instead to average 4.4% over that period (and the yield of all other Treasuries increased by an equal amount), we estimate it would add an additional $1.8 trillion to the debt over the next decade. This roughly matches our estimate of the revenue that would be raised from reciprocal tariffs, assuming they are made permanent. Interest payments on the debt are already projected to exceed the record 3.2% of GDP this year and grow past $1 trillion next year. If long-term yields were to remain at 4.4% and all other yields increased equally, interest costs would more than double to $2.1 trillion by 2035, approaching 5% of GDP. Costs would rise even further if Congress were to enact a costly reconciliation bill.


