The Internal Revenue Service, IRS, will mail checks worth up to $1,400 to taxpayers who did not claim their stimulus checks during the COVID-19 pandemic. Around one million U.S. taxpayers who were eligible for the check can expect a lump sum mailed to them during tax season.

A total of about $2.4 billion will be sent out automatically to taxpayers who did not claim the recovery rebate credit on their 2021 tax returns. The maximum payment to any one individual will be $1,400, though payments will vary “depending on several factors,” the IRS said.

The IRS has up to $2.4 billion in unclaimed stimulus payments it will soon send to up to 1 million taxpayers who are eligible.