On August 22, 2012, the first district appellate court held that a taxpayer who filed an amended tax return was rightly assessed a double interest charge under the Unified Penalty and Interest Act ("Penalty Act") because it failed to pay its entire tax liability for the years 2000 and 2001 during the 45-day amnesty period created by the 2003 Tax Delinquency Amnesty Act ("Amnesty Act").