1. On and after the effective date of any tax imposed in certain areas of a county under the provisions of sections 67.671 to 67.685, the county collector shall perform all functions incident to the administration, collection, enforcement, and operation of the tax, and the county collector shall collect the additional tax authorized by the provisions of sections 67.671 to 67.685. The tax imposed in certain areas of a county under sections 67.671 to 67.685 shall be collected and reported upon such forms as may be prescribed by the county collector.

2. On or after the effective date of any tax imposed throughout a county under the provisions of sections 67.671 to 67.685, the county collector shall perform all functions incident to the administration, collection, enforcement, and operation of the tax, and the county collector shall collect the additional tax authorized by the provisions of sections 67.671 to 67.685, unless the tax is imposed on all sales within the entire county that are subject to taxation under the provisions of sections 144.010 to 144.525, in which case the director of revenue shall be responsible for the administration, collection, enforcement, and operation of the tax, and all provisions of sections 32.085 and 32.087 shall apply to the tax so imposed, the provisions of sections 67.671 to 67.685 to the contrary notwithstanding. If the director of revenue is responsible for collection of the tax, an amount not to exceed one percent shall be retained by the director of revenue for deposit in the general revenue fund to offset the costs of collection. Any other tax imposed throughout a county under sections 67.671 to 67.685 shall be collected and reported upon such forms as may be prescribed by the county collector.