It also would be felt unevenly, said Jeff Zients, deputy director of the Office of Management and Budget. Military troops would not receive their full paychecks, but Social Security recipients would still get monthly benefits, he said.
"National parks, national forests and the Smithsonian Institution would all be closed. The NIH Clinical Center will not take new patients, and no new clinical trials will start," he added in a roll call of expected agency closings.
But the air traffic control system would stay up and running, the emergency management agency would still respond to natural disasters and border security would not be affected.
There was no indication Reid planned to bring the House-passed stopgap bill to a vote, and he accused Republicans of blocking a deal by demanding anti-abortion provisions and a blockade on Environmental Protection Agency regulations on greenhouse gas and other pollutants.
"We don't have the time to fight over the tea party's extreme social agenda," he said.
It was unclear whether the day's maneuvering marked attempts by negotiators to gain final concessions before reaching agreement, or represented a significant setback to efforts to avoid a shutdown.
Either way, Boehner pointed out that the current clash was only the first of many likely to follow as the new, conservative majority in the House pursues its goals of reducing the size and scope of government.
"All of us want to get on with the heavy lifting that is going to come right behind it, dealing with the federal debt and putting in place a budget for next year," he said.
For all the tough talk, it did not appear the two sides were too far from a deal.
Officials in both parties said that in the past day or so, Democrats had tacitly agreed to slightly deeper spending cuts than they had been willing to embrace, at least $34.5 billion in reductions.
Agreement on that point was conditional on key details, but it was a higher total than the $33 billion that had been under consideration.
It also was less than the $40 billion Boehner floated earlier in the week — a number that Republicans indicated was flexible.
There also were hints of Republican flexibility on a ban they were seeking to deny federal funds to Planned Parenthood. Officials said that in talks at the White House that stretched on after midnight on Wednesday, Republicans had suggested giving state officials discretion in deciding how to distribute family planning funds that now go directly from the federal government to organizations such as Planned Parenthood.
That would presumably leave a decision on funding to governors, many of whom oppose abortion, and sever the financial link between the federal government and an organization that Republicans assail as the country's biggest provider of abortions.
Democrats seemed unlikely to accept the proposal, and it was not clear whether it might form the basic framework for an agreement.
But Republicans quickly circulated a list of previous instances in which Obama had signed a similar provision or Reid and House Democratic leaders had supported it as part of a larger measure.
Legislation passed by the House six weeks ago called for $61 billion in cuts and dozens of non-spending provisions.
The Senate has yet to pass an equivalent bill of its own, but Congress has passed a pair of short-term measures in the intervening time to keep the government running, approving a total of $10 billion in spending cuts at the same time.
Associated Press writers Andrew Taylor, Ben Feller, Erica Werner and Julie Pace contributed to this report.
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