Provisional assessment allows provisional tax payment with bond, final reassessment and interest consequences on unpaid tax. Provisional assessment allows a taxable person unable to determine value or tax rate to request provisional payment; the proper officer may allow provisional tax at a specified value or rate, subject to a prescribed bond with surety or security ensuring payment of any difference. The proper officer must finalise assessment within six months, with permitted extensions for sufficient cause. Interest is payable on unpaid tax from the due date until actual payment, and refunds consequent to final assessment attract interest as provided in the statute.