The U.S. budget deficit will grow slightly in fiscal 2026 to $1.853 trillion, the Congressional Budget Office forecast on Wednesday, showing that on balance, President Donald Trump's economic policies are worsening the country's fiscal picture amid low economic growth. The CBO said the deficit for fiscal 2026 - Trump's first full fiscal year in office - will be about 5.8% of GDP, about where it was in fiscal 2025, when the deficit was $1.775 trillion.