law: 72. Amendment of assessment list.
  (1) The Chairperson may, at any time, amend the assessment list
  (a) by inserting therein the name of any person whose name ought to be inserted; or
  (b) by inserting therein any land or building previously omitted; or
  (c) by striking out the name of any person not liable for the payment of property tax; or
  (d) by increasing or reducing for adequate reasons the amount of any rateable value and of the assessment thereupon; or
  (e) by making or cancelling any entry exempting any land or building from liability to property tax; or
  (f) by altering the assessment on the land or building which has been erroneously valued or assessed through fraud, mistake or accident; or
  (g) by inserting or altering an entry in respect of any building erected, re-erected, altered or added to, after the preparation of the assessment list:
  Provided that no person shall by reason of any such amendment become liable to pay any tax or increase of tax in respect of any period prior to the commencement of the year in which the notice undersub-section (2) is given.
  (2) Before making any amendment under sub-section (1) the Chairperson shall give to any person affected by the amendment, notice of not less than one month that he proposes to make the amendment and consider any objection which may be made by such person.