Iowa Code § 518B.7: Recovery factor included.

Insurers shall include in filings submitted pursuant to chapter 515A, a factor, applicable to the line or lines of insurance on which the assessment is levied, sufficient to recover within not more than three years after the date of assessment any amounts so assessed under section 518B.4 during the preceding calendar year together with the amount of costs and expenses reasonably attributable to such assessment and recovery thereof.