Specific funds shall remain intact until the property is delivered or services performed as specified in the contract. The net income from the preneed trust account, after payment of any appropriate trustee fees, commissions, and costs, shall remain in the account and be reinvested and compounded. Any trustee fees, commissions, and costs in excess of income shall be paid by the cemetery company and not from the trust. However, the trustee shall, as of the close of the cemetery company’s fiscal year, upon written assurance to the trustee of a certified public accountant employed by the seller, return to the seller any income in the seller’s account which, when added to the specific funds, is in excess of the current cost requirements for all undelivered property or services included in the seller’s preneed burial contracts. The seller’s cost requirements shall be certified in its records by an affidavit sworn by the compliance agent and shall be determined by the seller as of the close of the cemetery company’s fiscal year.