After the city has entered into a contract for construction of the improvements, in accordance with the contract for same, the engineer or other official in charge of the improvement shall compute the cost thereof, and apportion the cost among the tracts of land chargeable therewith, charging each tract of land with its proportionate part of the costs, and shall make a written report to the governing body of the municipality describing each tract of land chargeable with a part of the cost of the improvement, and the amount with which it is chargeable. If the governing body of the municipality approves the report, which approval may be made by a motion duly adopted, then the clerk shall immediately thereafter issue and deposit the special tax bills into a special fund as authorized by section 88.815, or, if appropriate, shall hold such special tax bills for delivery to the contractor upon completion of the project in payment for the work in accordance with the engineer’s report, which tax bill shall be signed by the clerk and under the corporate seal of the municipality. Each tax bill shall in substance contain a brief general statement of the facts authorizing its issue, the amount for which it is issued, a description of the land against which it is issued, the name of the contractor to whom it is issued, the rate of interest which it bears, and when it begins to bear interest, and shall state that it is a special lien against the land therein described, and give the time that the lien continues. It need not give the name of the owner of the land against which it is issued.