How trump Big Tax Bill is Raising the Deficit

Based on early 2026 reports, the “One Big Beautiful Bill” (OBBB) and associated policies under the second Trump administration are projected to significantly increase the national deficit and debt, with estimates ranging from $2.4 trillion to over $4 trillion over the coming decade. The rise in the deficit is primarily driven by extending tax cuts, new tax provisions, and added interest on the national debt, which some analyses suggest is only partially offset by new tariff revenues. Center for American Progress +2

Here is how the legislation is raising the deficit:

1. Extension of 2017 Tax Cuts 

The core driver of the deficit increase is the permanent extension of the Tax Cuts and Jobs Act (TCJA) of 2017, which was originally designed to sunset at the end of 2025. Tax Policy Center

  • Revenue Loss: The extension of these provisions, along with new tax cuts, is projected to reduce federal tax revenues by roughly $4.5 trillion to $5.2 trillion over the 2025–2034 period.
  • Wealth Focus: Reports indicate that a significant portion of these tax benefits flows to the top 10% of income earners. Bipartisan Policy Center +2

2. New Tax Cuts and Spending Initiatives

The 2025 legislative package introduced new tax policies and increased spending in specific areas:

  • “No Tax on Tips” and Other Provisions: The bill includes popular tax provisions such as ending taxes on tips and overtime, which further reduce federal revenue.
  • Spending Increases: The legislation increases funding for defense and border security, adding to the fiscal gap. Bipartisan Policy Center +2

3. Increased Interest Costs 

Because the tax cuts are not fully funded by spending cuts, the government must borrow more money, leading to higher debt service costs. 

  • Added Debt Load: The CBO and other analysts indicate that when factoring in interest, the total addition to the national debt could exceed $4 trillion over ten years. Bipartisan Policy Center +1

4. Limited Offsets and Economic Factors

While the administration has argued that increased economic growth and new tariffs would offset the costs, analyses show a more complex picture: 

  • Tariff Revenue vs. Costs: While tariffs are bringing in additional revenue, they are also associated with lower inflation-adjusted incomes for Americans and higher costs for goods.
  • Net Impact: Even with some spending cuts to programs like Medicaid and nutrition assistance (SNAP), and projected tariff revenue, the Congressional Budget Office (CBO) and other trackers estimate the net effect is a significant increase in the deficit. Center for American Progress +2

Note: The White House has disputed these projections, arguing that the bill’s pro-growth policies, combined with spending cuts and tariff revenue, will ultimately reduce the deficit, as stated in June 2025 memos. The White House (.gov) +1