
Most of these savings are projected to occur later in the 2017–2027 period and thus may not materialize if economic growth slows or interest rates rise. Technical re-estimates have reduced mandatory spending projections but also tax revenues. Another $1.3 trillion comes from higher tax revenues produced by faster economic growth projections. Of this amount, $2.7 trillion comes from falling interest rate projections, which reduced the projected cost of net interest on the national debt. Economic and technical factors produced a substantial $3.9 trillion in actual and projected savings over this period.The president signed or enacted $7.8 trillion in new initiatives, the costs of which were partially offset by $3.9 trillion saved from economic growth revenues and technical re-estimates of taxes and spending levels.

When he left office four years later, CBO’s projected deficits for the same period were $13.9 trillion.

They argue that the 2017 tax cuts contributed heavily to the growing economy through 2019. On the other hand, the president’s defenders respond that he inherited large budget deficits that were already projected to grow on autopilot due to escalating Social Security and Medicare costs. They note that Trump’s presidency saw the debt surpass 100% of the economy, even though he came into office with a healthy economy, declining interest rates, and relative peace after 15 years of global military conflict. Critics point out that Trump’s tax cuts and spending increases led to a $3 trillion budget deficit. President Donald Trump’s tax, spending, and deficit legacy is still being defined.
