The county treasurer shall report and pay over the amount of tax and special assessments due to towns, districts, cities, villages, all other taxing units, corporations, persons, and land banks, collected by him or her, when demanded by the proper authorities or persons. Upon a demand, one payment shall be for the funds collected or received during the previous calendar month and shall be paid not later than the fifteenth of the following month. A second demand may be made prior to the fifteenth of the month on taxes and special assessments collected or received, during the first fifteen days of the month. The second demand shall be paid not later than the last day of the month.