(35 ILCS 5/Art. 6 heading)

(35 ILCS 5/601) (from Ch. 120, par. 6-601) Sec. 601. Payment on due date of return. (a) In general. Every taxpayer required to file a return under this Act shall, without assessment, notice or demand, pay any tax due thereon to the Department, at the place fixed for filing, on or before the date fixed for filing such return (determined without regard to any extension of time for filing the return) pursuant to regulations prescribed by the Department. If, however, the due date for payment of a taxpayer's federal income tax liability for a tax year (as provided in the Internal Revenue Code or by Treasury regulation, or as extended by the Internal Revenue Service) is later than the date fixed for filing the taxpayer's Illinois income tax return for that tax year, the Department may, by rule, prescribe a due date for payment that is not later than the due date for payment of the taxpayer's federal income tax liability. For purposes of the Illinois Administrative Procedure Act, the adoption of rules to prescribe a later due date for payment shall be deemed an emergency and necessary for the public interest, safety, and welfare. (b) Amount payable. In making payment as provided in this section there shall remain payable only the balance of such tax remaining due after giving effect to the following: (1) Withheld tax. Any amount withheld during any

calendar year pursuant to Article 7 from compensation paid to a taxpayer shall be deemed to have been paid on account of any tax imposed by subsections 201(a) and (b) of this Act on such taxpayer for his taxable year beginning in such calendar year. If more than one taxable year begins in a calendar year, such amount shall be deemed to have been paid on account of such tax for the last taxable year so beginning.

(2) Estimated and tentative tax payments. Any amount

of estimated tax paid by a taxpayer pursuant to Article 8 for a taxable year shall be deemed to have been paid on account of the tax imposed by this Act for such taxable year.

(3) Foreign tax. The aggregate amount of tax which is

imposed upon or measured by income and which is paid by a resident for a taxable year to another state or states on income which is also subject to the tax imposed by subsections 201(a) and (b) of this Act shall be credited against the tax imposed by subsections 201(a) and (b) otherwise due under this Act for such taxable year. For taxable years ending prior to December 31, 2009, the aggregate credit provided under this paragraph shall not exceed that amount which bears the same ratio to the tax imposed by subsections 201(a) and (b) otherwise due under this Act as the amount of the taxpayer's base income subject to tax both by such other state or states and by this State bears to his total base income subject to tax by this State for the taxable year. For taxable years ending on or after December 31, 2009, the credit provided under this paragraph for tax paid to other states shall not exceed that amount which bears the same ratio to the tax imposed by subsections 201(a) and (b) otherwise due under this Act as the amount of the taxpayer's base income that would be allocated or apportioned to other states if all other states had adopted the provisions in Article 3 of this Act bears to the taxpayer's total base income subject to tax by this State for the taxable year. This subsection is exempt from the 30-day threshold set forth in subparagraph (iii) of paragraph (B) of item (2) of subsection (a) of Section 304. The credit provided by this paragraph shall not be allowed if any creditable tax was deducted in determining base income for the taxable year. Any person claiming such credit shall attach a statement in support thereof and shall notify the Director of any refund or reductions in the amount of tax claimed as a credit hereunder all in such manner and at such time as the Department shall by regulations prescribe.

(4) Accumulation and capital gain distributions. If

the net income of a taxpayer includes amounts included in his base income by reason of Section 667 of the Internal Revenue Code (relating to accumulation and capital gain distributions by a trust, respectively), the tax imposed on such taxpayer by this Act shall be credited with his pro rata portion of the taxes imposed by this Act on such trust for preceding taxable years which would not have been payable for such preceding years if the trust had in fact made distributions to its beneficiaries at the times and in the amounts specified in Sections 666 and 669 of the Internal Revenue Code. The credit provided by this paragraph shall not reduce the tax otherwise due from the taxpayer to an amount less than that which would be due if the amounts included by reason of Section 667 of the Internal Revenue Code were excluded from his or her base income.

(c) Cross reference. For application against tax due of overpayments of tax for a prior year, see Section 909. (Source: P.A. 101-585, eff. 8-26-19.)

(35 ILCS 5/601.1) (Ch. 120, par. 6-601.1) Sec. 601.1. Payment by electronic funds transfer. (a) Beginning on October 1, 1993, a taxpayer who has an average monthly tax liability of $150,000 or more under Article 7 of this Act shall make all payments required by rules of the Department by electronic funds transfer. Beginning October 1, 1993, a taxpayer who has an average quarterly estimated tax payment obligation of $450,000 or more under Article 8 of this Act shall make all payments required by rules of the Department by electronic funds transfer. Beginning on October 1, 1994, a taxpayer who has an average monthly tax liability of $100,000 or more under Article 7 of this Act shall make all payments required by rules of the Department by electronic funds transfer. Beginning October 1, 1994, a taxpayer who has an average quarterly estimated tax payment obligation of $300,000 or more under Article 8 of this Act shall make all payments required by rules of the Department by electronic funds transfer. Beginning on October 1, 1995, a taxpayer who has an average monthly tax liability of $50,000 or more under Article 7 of this Act shall make all payments required by rules of the Department by electronic funds transfer. Beginning October 1, 1995, a taxpayer who has an average quarterly estimated tax payment obligation of $150,000 or more under Article 8 of this Act shall make all payments required by rules of the Department by electronic funds transfer. Beginning on October 1, 2000, and for all liability periods thereafter, a taxpayer who has an average annual tax liability of $200,000 or more under Article 7 of this Act shall make all payments required by rules of the Department by electronic funds transfer. Beginning October 1, 2000, a taxpayer who has an average quarterly estimated tax payment obligation of $50,000 or more under Article 8 of this Act shall make all payments required by rules of the Department by electronic funds transfer. Beginning on October 1, 2002, a taxpayer who has a tax liability in the amount set forth in subsection (b) of Section 2505-210 of the Department of Revenue Law shall make all payments required by rules of the Department by electronic funds transfer. Beginning on October 1, 2002, a taxpayer who has a tax liability in the amount set forth in subsection (b) of Section 2505-210 of the Department of Revenue Law shall make all payments required by rules of the Department by electronic funds transfer. (b) Any taxpayer who is not required to make payments by electronic funds transfer may make payments by electronic funds transfer with the permission of the Department. (c) All taxpayers required to make payments by electronic funds transfer and any taxpayers who wish to voluntarily make payments by electronic funds transfer shall make those payments in the manner authorized by the Department. (d) The Department shall notify all taxpayers required to make payments by electronic funds transfer. All taxpayers notified by the Department shall make payments by electronic funds transfer for a minimum of one year beginning on October 1. In determining the threshold amounts under subsection (a), the Department shall calculate the averages as follows: (1) the total liability under Article 7 for the

preceding tax year (and, prior to October 1, 2000, divided by 12); or

(2) for purposes of estimated payments under Article

8, the total tax obligation of the taxpayer for the previous tax year divided by 4.

(e) The Department shall adopt such rules as are necessary to effectuate a program of electronic funds transfer and the requirements of this Section. (Source: P.A. 91-541, eff. 8-13-99; 92-492, eff. 1-1-02; 92-846, eff. 8-23-02.)

(35 ILCS 5/602) (from Ch. 120, par. 6-602) Sec. 602. Tentative Payments. (a) In general. Pursuant to Section 505, the Department may promulgate regulations to provide automatic extensions of the time for filing a return. In connection with any other extension provided under Section 505 of the time for filing a return, the taxpayer shall file a tentative tax return and pay, on or before the date prescribed by law for the filing of such return (determined without regard to any extensions of time for such filing), the amount properly estimated as his tax for the taxable year. (b) Interest and Penalty. Interest and penalty on any amount of tax due and unpaid for the period of any extension shall be payable as provided by the Uniform Penalty and Interest Act. However, if the taxpayer is a member, or, in the case of a joint return, the spouse of a member, of the United States Armed Forces serving in a combat zone and subject to a filing extension in accordance with a proclamation by the President of the United States pursuant to Section 7508 of the Internal Revenue Code, no interest or penalty shall be applicable for the taxable year ending on and after December 31, 1990. (Source: P.A. 87-205; 87-339; 87-895.)

(35 ILCS 5/603) (from Ch. 120, par. 6-603) Sec. 603. (Repealed). (Source: Repealed by P.A. 88-195.)

(35 ILCS 5/604) (from Ch. 120, par. 6-604) Sec. 604. Any payment to the Department which is made by a check or money order not payable to the Department shall, within 15 days after receipt thereof, be returned by the Department to the taxpayer who submitted such check or money order or, if the amount of payment is equal to the amount owed to the State of Illinois, the Department may deposit such check. (Source: P.A. 86-977.)

(35 ILCS 5/605) (from Ch. 120, par. 6-605) Sec. 605. The Department may adopt rules and regulations for payment of taxes due under this Act by credit card only when the Department is not required to pay a discount fee charged by the credit card issuer. (Source: P.A. 87-1175; 87-1189.)

(35 ILCS 5/606) Sec. 606. EDGE payment. A payment includes a payment provided for in subsection (g) of Section 5-15 of the Economic Development for a Growing Economy Tax Credit Act. (Source: P.A. 96-836, eff. 12-16-09; 96-1000, eff. 7-2-10.)