I-3, r. 1 - Regulation respecting the Taxation Act

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851.22.4R12. If the terms of a specified debt obligation of a taxpayer are amended at any time in a taxation year of the taxpayer to change the timing or amount of any payment to be made, at or after that time under the obligation, the taxpayer’s accrued returns for the taxation year and for each subsequent taxation year are to be redetermined under Division III using a reasonable method that fully gives effect, in those accrued returns, to the alteration to the payments under the obligation.
O.C. 390-2012, s. 64.