The U.S. budget deficit will surpass $1 trillion by 2020, two years sooner than previously estimated, as tax cuts and spending increases signed by President Donald Trump do little to boost long-term economic growth, according to the Congressional Budget Office (CBO).

Spending will exceed revenue by $804 billion in the fiscal year ending Sept. 30, jumping from a $563 billion shortfall forecast in June, the non-partisan arm of Congress said in a report Monday. In fiscal 2019, the deficit will reach $981 billion, compared with an earlier projection of $689 billion.

Under CBO's report last June, deficits were set to surpass the trillion-dollar level in fiscal 2022. However, deficits are growing as the Trump administration enacted a tax overhaul this year that will lower federal revenue and Congress approved a roughly $300 billion spending increase. The fresh CBO estimates could heighten investor worries as they weigh the potential impact that tariff threats between the U.S. and China may have on the world economy.