Deficit Scale Revised Upward Again
Recent budget estimates indicate that over the next decade, the U.S. fiscal deficit may far exceed the early-year expectations of the Congressional Budget Office (CBO). The Committee for a Responsible Federal Budget (CRFB), a non-partisan watchdog, points out that the combination of tax and spending legislation with tariff policies has increased the total fiscal gap by nearly $1 trillion beyond CBO's forecast, with the cumulative deficit expected to exceed $22 trillion.
This revision has reignited concerns in both markets and academia regarding the sustainability of U.S. finances. Previously, attention was drawn when the CBO canceled its mid-year update, and now the uncertainty surrounding the deficit outlook has further magnified policy disputes.
New Policies Add Fiscal Pressure
The main factor contributing to the widening deficit is the tax and spending legislation introduced by the Trump administration. The tax cuts and budget expenditures from the "Great American Restoration Act" continue to elevate the deficit over the next decade. According to CRFB estimates, this act will increase the fiscal gap by over $4 trillion by 2035, far exceeding previous CBO evaluations.
Meanwhile, current tariff measures are expected to contribute approximately $3.4 trillion in revenue over the decade, serving as a partial buffer. However, as there is a risk of these policies being overturned by international trade courts, tariff revenue is not a stable source. Should they be lifted, a substantial amount of tariff-related income would disappear, potentially widening the U.S. fiscal gap instantly.
Interest Costs as the Biggest Burden
Notably, debt interest payments have become a critical driver of deficit expansion. CRFB predicts that total accumulated expenditure on Treasury interest over the next decade will exceed $14 trillion, rising from nearly $1 trillion in 2025 to close to $1.8 trillion by 2035, accounting for over 4% of the GDP.
If long-term interest rates remain above 4% instead of the CBO's assumed 3.8%, interest payments will further escalate. This indicates that the U.S. fiscal deficit is not merely determined by revenue and spending structures; the trajectory of market interest rates increasingly burdens the government.
Alternative Scenarios Look More Grim
CRFB has also outlined a more challenging alternative scenario: If temporary tax cut measures are extended and part of the tariff policy fails, the fiscal gap over the next decade could increase by nearly $7 trillion beyond the CBO's baseline. Thus projected, U.S. debt as a percentage of GDP could reach 134% by 2035, much higher than the CBO's baseline of 118%.
In this context, the fiscal space of the U.S. would be severely constrained, not only increasing the limitations on policy choices but also elevating systemic risks in the financial markets. International rating agencies and investors might question the credit status of U.S. Treasury bonds.
The Dual Challenge of Policy and Market
The issue of the U.S. fiscal deficit extends beyond being merely a numerical economic game; it involves both political and market dynamics. Legislative adjustments to expenditure and taxes determine the basic path of the deficit, while the interest rate environment could amplify the results.
Experts believe that if policymakers continue to rely on short-term stimulus measures without long-term fiscal discipline, it will be difficult to curb deficit and debt issues. In the coming years, how the U.S. strikes a balance between economic growth, fiscal prudence, and market confidence will determine the stability of its global financial standing.
Mounting Pressure on Deficit Management
All forecasts indicate an unpromising outlook for the U.S. fiscal deficit. CRFB's warnings highlight structural contradictions: the gap between extensive spending plans and limited fiscal revenues is rapidly widening.
Whether U.S. fiscal policy over the next decade can avoid sliding into a high-risk zone will depend on whether deficit control measures are implemented, whether trade policies continue to generate revenues, and whether interest rates remain within manageable bounds. Regardless of the eventual path, fiscal discipline and policy transparency will be key pillars of market confidence.
