Sen. Sherrod Brown said Wednesday that each year, the IRS has thousands of undelivered tax returns. In 2011, more than 2,000 Ohioans had unclaimed tax returns averaging more than $1,500. Typically, inaccurate addresses cause refund checks to be returned.

The IRS said it is looking to return $153.3 million in undelivered refunds to 99,123 taxpayers. The number was not separated by state.

“Middle class families can’t afford to leave one cent on the table, but that has happened because people don’t know the IRS has their money,” Brown said during the conference call Tuesday.

Undelivered tax returns often are highlighted by the IRS or government official, but this year the IRS is not releasing names of people who have undelivered tax refunds, citing privacy concerns.