As per Para 14-18 of IND AS 8, Changes in accounting policies can de done only in below mentioned Cases
14. An entity shall change an accounting policy only if the change:
(a) is required by an Ind AS; or
(b) results in the financial statements providing reliable and more relevant information about the effects of transactions, other events or conditions on the entity’s financial position, financial performance or cash flows.
15 Users of financial statements need to be able to compare the financial statements of an entity over time to identify trends in its financial position, financial performance and cash flows. Therefore, the same accounting policies are applied within each period and from one period to the next unless a change in accounting policy meets one of the criteria in paragraph 14.
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16 The following are not changes in accounting policies:
(a) the application of an accounting policy for transactions, other events or conditions that differ in substance from those previously occurring; and
(b) the application of a new accounting policy for transactions, other events or conditions that did not occur previously or were immaterial.
17 The initial application of a policy to revalue assets in accordance with Ind AS 16, Property, Plant and Equipment, or Ind AS 38, Intangible Assets, is a change in an accounting policy to be dealt with as a revaluation in accordance with Ind AS 16 or Ind AS 38, rather than in accordance with this Standard.
18 Paragraphs 19–31 do not apply to the change in accounting policy described in paragraph 17.
Applying changes in accounting policies
19 Subject to paragraph 23:
(a) an entity shall account for a change in accounting policy resulting from the initial application of an Ind AS in accordance with the specific transitional provisions, if any, in that Ind AS; and
(b) when an entity changes an accounting policy upon initial application of an Ind AS that does not include specific transitional provisions applying to that change, or changes an accounting policy voluntarily, it shall apply the change retrospectively.
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20 For the purpose of this Standard, early application of an Ind AS is not a voluntary change in accounting policy.
21 In the absence of an Ind AS that specifically applies to a transaction, other event or condition, management may, in accordance with paragraph 12, apply an accounting policy from the most recent pronouncements of International Accounting Standards Board and in absence thereof those of the other standard-setting bodies that use a similar conceptual framework to develop accounting standards.
If, following an amendment of such a pronouncement, the entity chooses to change an accounting policy, that change is accounted for and disclosed as a voluntary change in accounting policy.
22 Subject to paragraph 23, when a change in accounting policy is applied retrospectively in accordance with paragraph 19(a) or (b), the entity shall adjust the opening balance of each affected component of equity for the earliest prior period presented and the other comparative amounts disclosed for each prior period presented as if the new accounting policy had always been applied. Limitations on retrospective application
23 When retrospective application is required by paragraph 19(a) or (b), a change in accounting policy shall be applied retrospectively except to the extent that it is impracticable to determine either the period-specific effects or the cumulative effect of the change.
24 When it is impracticable to determine the period-specific effects of changing an accounting policy on comparative information for one or more prior periods presented, the entity shall apply the new accounting policy to the carrying amounts of assets and liabilities as at the beginning of the earliest period for which retrospective application is practicable, which may be the current period, and shall make a corresponding adjustment to the opening balance of each affected component of equity for that period.
25 When it is impracticable to determine the cumulative effect, at the beginning of the current period, of applying a new accounting policy to all prior periods, the entity shall adjust the comparative information to apply the new accounting policy prospectively from the earliest date practicable.
26 When an entity applies a new accounting policy retrospectively, it applies the new accounting policy to comparative information for prior periods as far back as is practicable. Retrospective application to a prior period is not practicable unless it is practicable to determine the cumulative effect on the amounts in both the opening and closing balance sheets for that period.
The amount of the resulting adjustment relating to periods before those presented in the financial statements is made to the opening balance of each affected component of equity of the earliest prior period presented. Usually the adjustment is made to retained earnings. However, the adjustment may be made to another component of equity (for example, to comply with an Ind AS).
Any other information about prior periods, such as historical summaries of financial data, is also adjusted as far back as is practicable.
27 When it is impracticable for an entity to apply a new accounting policy retrospectively, because it cannot determine the cumulative effect of applying the policy to all prior periods, the entity, in accordance with paragraph 25, applies the new policy prospectively from the start of the earliest period practicable. It therefore disregards the portion of the cumulative adjustment to assets, liabilities and equity arising before that date. Changing an accounting policy is permitted even if it is impracticable to apply the policy prospectively for any prior period. Paragraphs 50–53 provide guidance on when it is impracticable to apply a new accounting policy to one or more prior periods