Over a million Americans fail to file a tax return every year. By not filing, many of these people risk losing any refund they're owed, which averages more than $600, according to Internal Revenue Service estimates.
The law gives procrastinators three years to submit a return and claim a refund. The three-year countdown starts on the original due date. Late filers who owe no taxes don't pay any penalty, and might even be eligible to get credits beyond the money withheld from their wages.