In determining the tax liability that the individual would have incurred had he or she filed a separate return, any item of income, deduction, exemption credit, or payment that is not clearly allocable to either spouse shall be divided equally between the spouses. In determining the payments of tax allocable to an individual for a taxable year, any payment of estimated tax made on behalf of both spouses, any credit allowed on a return for an overpayment reported on the preceding taxable year's joint return by the same spouses, and any refund or credit allowed for an overpayment shown on the return for the taxable year will be allocated in proportion to the separate return amount of each spouse for the taxable year, as determined without regard to such estimated tax payment, credit or overpayment refunded or credited.
Example 1. Interest earned on a joint bank account, the exemptions allowed for dependent children, the credit for property taxes paid with respect to the spouses' principal residence, and any payment of estimated tax made from a joint bank account will be divided equally between the spouses in the absence of evidence that such amounts should be allocated in a different manner.
Example 2. Husband and Wife file a 1999 Illinois income tax return, reporting an overpayment of $500 that they elect to have credited against their joint estimated tax liability for 2000. They make joint estimated tax payments of $200 in 2000 and file a joint return for 2000, and Wife subsequently requests innocent spouse relief. For 2000, Husband's separate return amount, as determined without regard to the $500 credit or the $200 in estimated tax payments, is $2,000. The tax on Wife's separate return items is less than the amount of Illinois income tax withheld from her wages by her employer. Accordingly, the entire $700 in credit and estimated tax payments are allocable to Husband. If Wife's separate return amount, determined without regard to the credit or the estimated tax payments, were $1,000, one-third of the $700 would be allocable to her and two-thirds would be allocable to Husband.
Example 3. Husband and Wife file a joint return for 2000 that omits $5,000 in compensation earned by Husband from a temporary job. Wife knew that the $5,000 was improperly omitted at the time she signed the return. In determining the deficiency allocable to Husband, the $5,000 will be allocated to him because it is his income. However, in determining the deficiency allocable to Wife, the $5,000 will be allocated to her because it is an erroneous item of which she had actual knowledge. Note that the Department has the burden of proof to show that Wife had actual knowledge of the erroneous item.
Ill. Admin. Code tit. 86, § 100.5040
Amended at 32 Ill. Reg. 10170, effective June 30, 2008