WASHINGTON — A plan to send between $500 and $1,000 rebates to all but the richest taxpayers advanced in the Senate today after Republicans and Democrats teamed to add aid for disabled veterans, the elderly, and the unemployed to a House-passed economic recovery bill.

The package would make individuals with annual incomes of up to $150,000 and couples with incomes up to $300,000 eligible for the rebates. Qualifying families would also get $300 for each child.

The Senate Finance Committee approved the measure on a bipartisan vote today, and senior aides said the Senate could begin voting on it as early as tomrrow in hopes of completing it by week’s end.

The income limits compare with caps of $75,000 for individuals and $150,000 for couples in an economic stimulus bill the House passed yesterday.

They were part of a bill written by the Finance Committee chairman, Senator Baucus, Democrat of Montana, and backed by the panel’s senior Republican, Senator Grassley of Iowa, which would pump $193 billion into the economy over the next two years. The House measure would inject $161 billion.

The Senate plan also would expand rebate eligibility to 20 million older Americans on Social Security and to disabled veterans and tack on an unemployment extension for those whose benefits have run out.

“It helps seniors and it helps those hit hardest by the economic downturn,” Mr. Baucus said of his plan.

He said it could win quick approval and be ready for enactment by February 15.

“This cannot be loaded down,” Mr. Grassley said, “or it is likely to sink.”

Mr. Baucus originally proposed to let even the richest taxpayers share in the rebates, saying that would attract Republican support for his measure. Mr. Grassley said that lifting what some Republicans deemed “suffocating income limits” in the House plan was a key reason he was backing the bill.

But Senate Democrats balked at the idea of wealthy people — including lawmakers — getting rebate checks. Mr. Baucus’s new proposal expressly bars members of Congress from getting the checks.

It also goes further than the House package in efforts to bar illegal immigrants from receiving rebates. Under the Senate measure, recipients and their spouses and children would have to have valid Social Security numbers to qualify. The House bill omits that requirement, although it expressly disqualifies nonresident aliens.

In backing the bill, Mr. Grassley broke with President Bush and the Senate Republican leader, Mitch McConnell of Kentucky. Both have said the Senate should simply pass the House-passed stimulus measure.

Mr. Grassley told Iowa reporters that he believed the Senate would act quickly on the measure and that he and Mr. Baucus would team up to try to block further amendments to the bill.

“If Baucus and I can work together, we can keep amendments down, keep it from becoming a Christmas tree,” Mr. Grassley said.

The bipartisan Senate package faced challenges from the left and right. Democrats and some Republicans said today they would move to add money for food stamps and heating aid for the poor.

“We have to thread the needle here. We want to improve the bill, but we don’t want to move it so far from the House bill that we slow it down,” Senator Schumer, Democrat of New York, said.

A White House spokesman, Tony Fratto, traveling on Air Force One to California with President Bush today, said the disappointing fourth-quarter growth rate should give the Senate greater urgency to pass the bill.

“We’d like to see some leadership that will encourage members to put away some of their pet ideas and think about the bigger picture,” Mr. Fratto said.

Mr. Grassley said he does not support $14 billion in additional unemployment insurance for workers whose benefits have run out, but he was willing to go along in exchange for Democratic concessions such as lifting the House-passed income limits.

Mr. Baucus’s measure would extend unemployment payments for 13 weeks for those whose benefits have run out, with 26 more weeks available in states with the highest unemployment rates. The only state that currently meets the trigger is Michigan.

The Senate plan would restore a business tax break dropped during the House negotiations that would permit corporations suffering losses now to reclaim taxes previously paid.

Both packages include roughly $50 billion worth of tax incentives for businesses to invest in new plants and equipment. Mr. Baucus’s plan also adds $5.5 billion in renewable energy tax incentives.

Some Republicans criticized the package as shortsighted and ineffective.

“Giving people tax rebates and telling them to go shopping will do virtually nothing to stimulate the economy,” Senator Kyl, Republican of Arizona, said. “Only a permanent reduction in taxes will do that.”