(CBS) — Time is running out for homeowners who received improper property tax deductions to qualify for amnesty.

“This is their get out of jail free card and they don’t have to pay the interest,” said Berrios.

The deadline is December 31. Cook County Assessor Joe Berrios says next year, his office will link with Lexus Nexus which will tell him who is skating on multiple homestead exemptions or property tax breaks reserved for low income seniors or the disabled

“They should fess up now because after January 1, now we are talking about interest and penalties,” said Berrios.

Berrios says Cook County will net an additional $15 million annually by closing down unjustified property tax exemptions. He suggests using the amnesty period before penalties begin after the first of the year.

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