Whether they supported the Bush tax cut plan or not, most Americans will be happy when the refund check that is part of it appears in the mail.

And it may be coming sooner rather than later. Some economists are saying the checks of up to $300 a person may stave off a recession in just the nick of time, and the Bush administration is listening.

"We may not be able to do better than (September), but I am not satisfied that we can't," Treasury Secretary Paul O'Neill told reporters Wednesday after a meeting with top officials overseeing the operation.

While the current schedule calls for the first of an estimated 95 million checks to start showing up in mailboxes in late July and be completely distributed before the end of the year, O'Neill said he was applying pressure to IRS officials to get the job done more quickly.

The IRS plans to send the checks out at a rate of 11 million per week, the first such massive tax refund operation conducted since the Ford administration sent out $200 refund checks in 1975.

By July 15, everyone who filed a tax return in 2000 will receive letters telling them how much of a refund they will be getting and an estimate of when the checks will arrive. The actual check mailout will be based on the last two digits of the Social Security number of the taxpayer listed first on the 2000 return, starting at 00 and going through 99.

The amount of the refund check will be based on the taxpayer's 2000 income tax return. The maximum will be $600 for married filers and $300 for single filers.

The refund checks will come to 5 percent of taxable income, up to $6,000 for an individual filer and $12,000 for a couple filing jointly.

While the amount of the check will be based on 2000 income figures, the refund is being mailed to reflect the decision by Congress to lower the bottom tax rate to 10 percent from 15 percent, retroactive to Jan. 1 of this year.

Congress, under heavy pressure from the administration, overcame doubts and retained the refund mailout in the final version of the $1.35 trillion, 10-year tax cut program passed last Saturday.

The administration pushed for the checks because of the belief that the economy needed the jolt provided from a quick infusion of cash. Also helping this year will be half-point cuts in other individual tax rates that will be felt more gradually as employers adjust withholding rates.

Private economists said all the tax relief is coming at a critical time. Economic growth came to a near standstill of just 1 percent for the gross domestic product in the final three months of last year and 1.3 percent GDP growth in the first three months of this year.

David Wyss, economist at Standard & Poor's, said the GDP in the current April-June quarter may very well have turned negative, reflecting big cutbacks in business spending on new plants and equipment.

By a standard definition, a recession occurs when the GDP, the economy's total output, is negative for two consecutive quarters.

But because of the rebates, analysts were predicting a much better performance in the second half of this year. Wyss said GDP growth could average 3.5 percent in the July-December period.

"We expect Americans will spend close to half of their rebate checks. This will have quite an impact in the second half of this year," Wyss said.

"Roughly half the population is struggling and living almost pay check to pay check," said Mark Zandi, chief economist at Economy.com. "Those folks will use the rebate almost immediately."

Zandi said the checks would come in time to help many Americans pay back-to-school bills and everyone would have the money in time for Christmas shopping.

Critics of the refund idea have raised the specter that thousands of checks will go astray, sent by the IRS to the wrong addresses because people have moved. IRS officials advise that people who have moved should make sure they have filed a change of address form with the Post Office.

The AP contributed to this report.