WASHINGTON, Oct 8 (Reuters) - The Congressional Budget

Office estimated on Tuesday a U.S. federal deficit of $1.834

trillion for fiscal 2024, the highest in the post-COVID era, as

debt interest costs jumped sharply and outlays rose for Social

Security, Medicare and health insurance tax credits.

The estimate, which precedes the U.S. Treasury Department's

year-end budget report later this month, shows a deficit up 11%

from the $1.7 trillion fiscal 2023 gap but slightly lower than

the $1.9 trillion deficit estimated in June by CBO.

WHY IT'S IMPORTANT

U.S. Vice President Kamala Harris is arguing that she would

be more fiscally responsible as president than Republican rival

Donald Trump, pledging to fully offset new spending with tax

increases elsewhere. A fiscal think-tank, the Committee for a

Responsible Federal Budget, estimated on Monday that Trump's

plans would pile up $7.5 trillion in new debt, more than twice

the $3.5 trillion from Harris' proposals.

But after significant U.S. deficit declines in 2021 and 2022

as the economy recovered and COVID-19 rescue spending faded,

deficits have grown significantly during the past two years, and

CBO estimates that "baseline" deficits, which assume no changes

to current laws, will grow $22 trillion over the next 10 years.

BY THE NUMBERS:

CBO estimated that total revenues rose 11% to $4.918

trillion, powered by higher individual income taxes and

corporate income taxes as economic growth remained strong. The

non-partisan budget referee agency estimated that outlays for

the fiscal year ended Sept. 30 totaled $6.752 trillion, up 11%

from fiscal 2023.

The biggest growth in outlays comes from interest on the

public debt, which rose 34% to $950 billion, while spending on

Medicare, Social Security and the military also increased.

The year-on-year deficit comparisons were affected by the

fiscal 2023 reversal of $330 billion in costs associated with

President Joe Biden's student loan forgiveness plan that was

struck down by the Supreme Court. Without the reversal, last

year's deficit would have exceeded $2 trillion.

KEY QUOTE

Some Republicans seized on the estimates to claim that Biden

and Harris were fiscally irresponsible.

"President Biden and Vice President Harris have ignored

resounding messages from Iowans and Americans nationwide, as

well as alarms from global credit ratings companies. By

consistently choosing a spendthrift agenda over fiscal sanity,

this administration has hamstrung our economy for generations to

come," Republican Senator Chuck Grassley said in a statement.