(1) On or before March 1 of each year each insurer shall file with the Department of Revenue a report of its gross underwriting profit on wet marine and transportation insurance, as defined in s. 624.607(2), written in this state during the calendar year next preceding and shall at the same time pay to the Department of Revenue a tax of 0.75 percent of such gross underwriting profit. (2) Such gross underwriting profit shall be ascertained by deducting from the net premiums (i.e., gross premiums less all return premiums and premiums for reinsurance) on such wet marine and transportation insurance contracts the net losses paid (i.e., gross losses paid less salvage and recoveries on reinsurance ceded) during such calendar year under such contracts.
(3) The income tax imposed under chapter 220 which is paid by any insurer shall be credited against, and to the extent thereof shall discharge, the liability for tax imposed by this section for the annual period in which such income tax payment is made. The aggregate income tax credit for any insurer under this subsection and s. 624.509(4) shall not exceed the amount of tax paid under chapter 220 in any calendar year. As to any insurer issuing policies insuring against loss or damage from the risks of fire, tornado, and certain casualty lines, the tax imposed by this section, as intended and contemplated by this subsection, shall be construed to mean the net amount of such tax remaining after there has been credited thereon such gross premium receipts tax as may be payable by such insurer in pursuance of the imposition of such tax by any incorporated cities or towns in the state for firefighters’ relief and pension funds and police officers’ retirement funds maintained in such cities or towns, as provided in and by relevant provisions of Florida Statutes. For purposes of this subsection, payments of estimated income tax under chapter 220 shall be deemed paid either at the time the insurer actually files its annual return under chapter 220 or at the time such return is required to be filed, whichever first occurs, and not at such earlier time as such payments of estimated tax are actually made. 