INFINITY PROPERTY AND CASUALTY CORPORATION 10-Q EXHIBIT 99 CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 A SIGNED ORIGINAL OF THIS WRITTEN STATEMENT WILL BE RETAINED BY THE REGISTRANT AND FURNISHED TO THE SECURITIES AND EXCHANGE COMMISSION OR ITS STAFF UPON REQUEST. In connection with the filing with the Securities and Exchange Commission of the Quarterly Report of Infinity Property and Casualty Corporation (the "Company") on Form 10-Q for the period ended March 31, 2003 (the "Report"), each of the undersigned officers of the Company certifies, pursuant to section 906 of the Sarbanes-Oxley Act of 2002, that to the best of his knowledge: (1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Act of 1934; and (2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. May 14, 2003 BY: s/JAMES R. GOBER - ------------------------ ------------------------------- Date James R. Gober Chief Executive Officer May 14, 2003 BY: s/ROGER SMITH - ------------------------ ------------------------------- Date Roger Smith Chief Financial Officer 21