320 ILCS 30/6
All or any part of taxes deferred under this Act and the accrued interest thereon, which are not due under a valid deferral and recovery agreement, may be paid to the collector at any time by the taxpayer or his spouse, or, if no objection is made by the taxpayer within 10 days after the collector mails him a written notice of the tender of such a payment, by a child, heir or next of kin of the taxpayer or other person claiming a legal or equitable interest in the property. In the absence of a valid agreement to the contrary and except as otherwise provided by law, such a payment by a person other than the taxpayer or his spouse confers no interest in the property nor claim against the estate. Payments made under this Section shall be applied first against accrued interest and any remainder against the deferred taxes and do not affect the deferred tax status of the property.
320 ILCS 30/6