According to the Washington Post,

The Internal Revenue Service plans to send electronic payments as soon as late next week to more than 115 million Americans as part of the $2 trillion coronavirus law, a week sooner than expected, according to a plan circulated internally on Wednesday.

However, $30 million in paper checks for millions of other Americans won’t start being sent out until April 24, as the government lacks their banking information.

The IRS plan would distribute paper checks to the lowest-income Americans first, prioritizing payments for individual taxpayers with incomes of $10,000 or less on April 24.

Checks for earners of $20,000 or less would be in the mail May 1, followed by those with incomes of $30,000 on May 8, $40,000 on May 15, and continuing in income increments of $10,000 each week, according to the plan. The IRS plans to issue about 5 million checks each week.

Stimulus checks would be issued on Sept. 4 to joint taxpayers earning around $200,000, the maximum allowed under the stimulus. All others would be sent on Sept. 11, in most cases because the IRS did not have prior tax information for them and they need to apply for the checks.