34 (1) If, after notices of assessment have been given under section 31 and before the last day of the taxation year for which taxes are levied on the assessment referred to in the notices, (a)  an increase in value occurs which results from the erection, alteration, enlargement or improvement of any building, structure, machinery, equipment or fixture or any portion thereof that commences to be used for any purpose; (b)  land or a portion of land ceases, (i)  to be exempt from taxation, (ii)  to be farm lands the current value of which is determined in accordance with subsection 19 (5), (iii)  to be conservation land the current value of which is determined under subsection 19 (5.2), (iii.1)  to be land in the managed forests property class the current value of which is determined under subsection 19 (5.2) or (5.2.1), (iv)  to be land the current value of which is based on current use under regulations made under subsection 19 (2), or (v)  to be classified in a subclass of real property; (c)  Repealed:  1997, c. 5, s. 22 (1). (d)  a pipeline increases in value because it ceases to be entitled to the reduction provided for in subsection 25 (9), the assessor may make the further assessment that may be necessary to reflect the change, and upon receiving notice of the further assessment, the clerk of the municipality or, in the case of land in non-municipal territory, the Minister shall enter a supplementary assessment on the tax roll and the amount of taxes to be levied thereon shall be the amount of taxes that would have been levied for the portion of the taxation year left remaining after the change occurred if the assessment had been made in the usual way.  R.S.O. 1990, c. A.31, s. 34; 1997, c. 5, s. 22 (1); 1997, c. 29, s. 18 (1); 1998, c. 3, s. 8 (1); 2002, c. 17, Sched. F, Table; 2005, c. 28, Sched. A, s. 4; 2006, c. 33, Sched. A, s. 24 (1). Supplementary classification (2) If, during the taxation year or the period after June 30 in the preceding taxation year, a change event, within the meaning of subsection (2.2), occurs that would change the class or subclass of real property that a parcel of land or a part of such a parcel is in, the assessor may change the classification accordingly, and, upon receiving notice of the change, the clerk of the municipality or, in the case of land in non-municipal territory, the Minister, shall enter it on the tax roll and the tax levied for the taxation year shall be determined in accordance with the new classification. 2018, c. 8, Sched. 1, s. 8 (1). Limitations (2.1) The following apply with respect to subsection (2): 1.  Subsection (2) does not affect the tax levied for the taxation year in respect of a part of the taxation year preceding the change event. 2.  Paragraph 1 does not apply to a change event described in clause (c) of the definition of “change event” in subsection (2.2). 3.  Repealed:  2000, c. 25, s. 9. 1998, c. 3, s. 8 (2); 2000, c. 25, s. 9. “change event” (2.2) For the purposes of subsections (2) and (2.1), “change event” includes, (a)  a change in the use of all or part of the parcel of land, (b)  an act or omission that results in all or part of the parcel of land ceasing to be in a class or subclass of real property, and (c)  the opting, by a council of a single or upper tier municipality, to have a class or subclass of real property apply or cease to apply within the municipality. 1998, c. 3, s. 8 (2); 2002, c. 17, Sched. F, Table; 2018, c. 8, Sched. 1, s. 8 (2). (2.3) Repealed:  2006, c. 33, Sched. A, s. 24 (3). Re-classification (3) If subclause (1) (b) (ii) or (v) apply with respect to land or a portion of land, the assessment corporation, in addition to making a further assessment, may also change the classification of the land.  1997, c. 29, s. 18 (2); 2006, c. 33, Sched. A, s. 24 (4). Changes to next assessment roll (4) If the assessment corporation makes an assessment or classification under this section, or could have done so but did not, the appropriate changes shall be made on the assessment roll for the next year, even if the day as of which land is valued for the next year is the same as for the current year.  1998, c. 3, s. 8 (3); 2006, c. 33, Sched. A, s. 24 (5). Section Amendments with date in force (d/m/y) 1997, c. 5, s. 22 (1) - 01/12/1997; 1997, c. 29, s. 18 (1, 2) - 01/12/1997; 1998, c. 3, s. 8 (1-3) - 11/06/1998; 1998, c. 33, s. 6 - 18/12/1998 2000, c. 25, s. 9 - 01/01/2001 2002, c. 17, Sched. F, Table - 01/01/2003 2004, c. 31, Sched. 3, s. 11 - 16/12/2004 2005, c. 28, Sched. A, s. 4 - 12/12/2005 2006, c. 33, Sched. A, s. 24 (1-5) - 01/01/2008 2018, c. 8, Sched. 1, s. 8 (1, 2) - 08/05/2018