WASHINGTON — The $900 billion economic relief package that emerged from Congress over the weekend will deliver vital aid to millions of households and businesses that have been struggling for months to survive. Yet with the economy still in the grip of a pandemic that has increasingly tightened curbs on business activity, more federal support will likely be needed soon.

And it’s unclear whether or when the government might provide it.

For now, the package that congressional leaders agreed to Sunday will provide urgently needed benefits to the unemployed, loans to help small businesses stay open and up to $600 in cash payments to most individuals. It will also help families facing evictions remain in their homes. The measure includes no budgetary help, though, for states and localities that are being forced to turn to layoffs and service cuts as their tax revenue dries up — a potential long-run drag on the economy.

Months from now, economists say, the widespread distribution and use of vaccines could potentially unleash a robust economic recovery as the virus is quashed, businesses reopen, hiring picks up and consumers spend freely again. Until then, though, the limited aid Congress has agreed to won’t likely be enough to stave off hardships for many households and small companies, especially if lawmakers balk at enacting further aid early next year. And a widening financial gap between the affluent and disadvantaged households is likely to worsen.

“Some aid is better than no aid,” said Gregory Daco, chief U.S. economist at Oxford Economics, a consulting firm. “It’s positive. But it’s likely going to be insufficient to bridge the gap from today until late spring or early summer when the health situation fully improves.”

President-elect Joe Biden has said he will seek another relief package soon after his inauguration next month, setting up another political fight, given that some Senate Republicans have said that with vaccines on the way, they think further government aid may be unnecessary.

The new rescue support offers less aid than Democrats had pushed for and much less than was provided in a multi-trillion dollar package for households and businesses that the government enacted in March. A new supplemental federal jobless benefit, for example, was set at $300 a week — half the amount provided in March — and will expire in 11 weeks. An extension of a benefits program for jobless people who have exhausted their regular state benefits and for self-employed and gig workers will also be extended until mid-March, well before the economy is likely to have fully recovered.

“It’s not as if in March there’s suddenly going to be a light switch that’s turned on and we’re back in pre-COVID mode,” Daco said.

Yet the new aid package may be enough, for now, to prevent another recession. S&P Global estimates that the money should help boost the U.S. economy back to its pre-pandemic level by the July-September quarter of next year — seven months or so from now. Without any support, that level wouldn’t have been reached until 2022, S&P estimates.

The economy has been enduring a renewed slump as the resurgent virus has intensified pressure on businesses and consumers have stopped shopping, traveling, dining out and attending sports and entertainment events. Key measures of the economy — retail sales, applications for jobless aid, travel spending — have steadily weakened.

More than 9 million Americans had faced a total cutoff of their unemployment benefits if Congress hadn’t agreed to the new package after months of stalemate. More than 4 million have already used all the unemployment aid available to them, which lasts 26 weeks in most states; they will be able to reapply.

They include Warren Calvert, who ran out of unemployment benefits about two months ago, and is several months behind on his electric bill. In the spring, Calvert lost what he considered the best job he ever had: A $15-an-hour concession cook at the Fiserv Forum arena in Milwaukee, where the NBA’s Bucks play.

Now, Calvert and his girlfriend, who also lost a serving job at Fiserv, are trying to manage by selling homemade eggrolls around their neighborhood. To try to stay on top of his rent, he sells the eggrolls — original fusion concoctions like chili or cheese steak — at all hours of the day and night. With little money left over for other food, they mostly eat egg rolls themselves.

“It’s really still hard — I’m still struggling day by day,” Calvert, 38, said. “Ain’t nobody feeling Christmas-y right now. Who’s buying presents? I’m going to put up some lights, and that’s it.”

The much larger rescue package that the government enacted in March was widely credited with averting a disaster. Be injecting money quickly into the pockets of individual Americans, it served to reduce poverty. But as much of that aid expired over the summer, poverty grew. Many people ran through the $1,200 direct payment checks that had been distributed in April and May. And a supplemental $600 in jobless benefits expired over the summer.

According to research by Bruce Meyer at the University of Chicago and two colleagues, the U.S. poverty rate jumped from 9.3% in June to 11.7% in November — an increase of nearly 8 million people.

The new economic relief package restores the Paycheck Protection Program, which offers forgivable loans to many businesses. But many small businesses complain that the program in the past was too restrictive, requiring them to use most of the money on payroll and not enough for other expenses like rent, the cost of personal protective equipment, or other supplies.

According to the data firm Womply, about one in five small businesses have closed since early spring. More than half of small businesses have just two months’ cash on hand or less, and one in six has two weeks or less of cash, according to a survey by the Census Bureau.

Most economists say that any further aid for small businesses should be mostly focused on keeping them alive, rather than maintaining payrolls. If a business shuts down, they note, it can’t re-hire once the pandemic is under control.

Sasha Coleman, one of three worker-owners of a co-op restaurant near Boston named Tanam, said they are barely surviving the coronavirus recession. They’re relying on takeout food and cocktails that are generating less than one-fifth of pre-pandemic revenue.

The restaurant, which closed from March to September, received a small business loan from the PPP program. But like many small companies, Coleman and her co-worker-owners would prefer something that lasts longer and is more flexible. The PPP required most of the proceeds to be spent on payroll for just eight weeks. They need to pay rent, maintain their health insurance and help offset the expenses they absorbed for adapting to takeout and outdoor dining, like buying patio furniture and outdoor heaters.

“It’s just been very frustrating because there is this expectation to stay open and put on a good face for the customers, without much help from the government,” said Kyisha Davenport, another worker-owner.

Democrats had wanted the new economic relief package to include about $160 billion in aid for state and local governments. But Senate Republicans opposed it. States and cities have already cut about 1.3 million jobs since the pandemic began, contributing to a higher unemployment rate.

Speaking at a news conference last week, Federal Reserve Chair Jerome Powell warned that millions of people are urgently in need of federal rescue aid to carry them through the next several months until an economic recovery can be sustained.

“Now that we can see the light at the end of the tunnel,” Powell said, referring to the new vaccines, “it would be bad to see people losing their business, their life’s work in many cases, or even generations worth of work because they couldn’t last another few months.”