EXAMPLE 1
T, a calendar year taxpayer, receives an extension to June 30, 1972 to file a 1971 return. On April 15, 1972, T files a tentative return pursuant to IITA Section 602(a) showing an estimated liability of $500 that has been paid through withholding, estimated tax payments, or as a payment with the tentative return of the tax properly estimated to be due. On June 15, 1972, T files a 1971 return showing a tax liability of $3,000 including interest for late payment and remits $2,500 that in addition to the $500 paid as indicated, satisfies the liability shown on the return. On August 15, 1972, T files a claim for refund for $1,500 as an overpayment of 1971 tax. The date of overpayment for the computation of any interest would be June 15, which is the date when payments first exceeded liability, as now shown as a result of the claim for refund, and that is the date when the return for the taxable year was first filed. See Example 2 for application of the 3-month rule.
EXAMPLE 2
Assume the same facts as in Example 1 and that T's refund claim of $1,500 was allowed and paid on September l. No interest would be allowed because the refund was made within 3 months after June 15, the date the return for the taxable year was filed. If the refund was made on October 1, interest would be allowed from June 15 to a date that would be not more than 30 days prior to October 1.
EXAMPLE 3
W, a calendar year taxpayer, files a return on March 7 and claims a refund as a result of excess withholding. The refund is made July l. No interest would be allowed because the refund was made within 3 months after April 15, which is the later of the last day prescribed for filing the return or the date the return was filed. If, with the same facts, the refund is made July 28, interest would be allowed from April 15 (the date of overpayment).
EXAMPLE 4
X, a calendar year corporation, sustains a federal net operating loss in 1973. X files a federal claim for refund, carrying the loss back to 1970 and receives a refund of federal taxes for 1970 based on the net operating loss carryback. (Refer to subsection (f)(4) respecting a federal application for tentative carryback adjustment.) X then files Form IL-1120-X claiming an overpayment of 1970 Illinois tax as a result of a federal change in its reported taxable income for 1970. The date of overpayment would be December 31, 1973, the close of the taxable year in which the federal net operating loss occurred (provided an original 1970 IL-1120 had been filed by this date).
Ill. Admin. Code tit. 86, § 100.9400
Amended at 35 Ill. Reg. 4223, effective February 25, 2011