The Internal Revenue Service says more than 33,600 Michiganians have unclaimed federal income tax refunds averaging $763 per return waiting to be claimed.

A total of nearly $34 million may be due to those Michigan taxpayers who did not file a 2013 federal income tax return.

To collect the money, taxpayers must file a 2013 return no later than this year's tax deadline.

The IRS reminds taxpayers there is no penalty for filing a late return if a refund is due.