Is a change from non-GAAP to GAAP considered an accounting error?
If a company switches from non-GAAP to GAAP, that is considered an accounting error and not a chance in accounting policy. Since a company’s financial statements must be prepared in accordance with GAAP, any item that is non-GAAP would be considered an error.
An error is a type of accounting change that requires restatement. Restatement means that the company must go back to prior periods and restate the financial statements so that they no longer contain financial figures that are non-GAAP.

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If a company identifies an error in prior period financial statements, what should they do?
If errors are identified and they are material or cause the financial statements to be misleading, then the company should restate the financial statements and reissue them.
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How to Account for a Change in Accounting Estimate:
Changes in estimates, such as the estimated useful like for a tangible asset or the bad debt allowance percentage, are accounted for on a prospective basis. This means that the current and future financial statements must reflect the change, but the company does not need to change historical periods. Instead, the change will be made...
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How a Account for Changes in Accounting Principle
Assuming the change in accounting principle is justified (i.e. makes sense), then the change should be reflected on a retrospective basis. Unlike the prospective treatment for changes in accounting estimate, this means that any prior periods that are included in the current year financial statements need to be restated to reflect the new accounting principle....
If a company identifies an error in prior period financial statements, what should they do?
If errors are identified and they are material or cause the financial statements to be misleading, then the company should restate the financial statements and reissue them.
How to Account for a Change in Accounting Estimate:
Changes in estimates, such as the estimated useful like for a tangible asset or the bad debt allowance percentage, are accounted for on a prospective basis. This means that the current and future financial statements must reflect the change, but the company does not need to change historical periods. Instead, the change will be made...
How a Account for Changes in Accounting Principle
Assuming the change in accounting principle is justified (i.e. makes sense), then the change should be reflected on a retrospective basis. Unlike the prospective treatment for changes in accounting estimate, this means that any prior periods that are included in the current year financial statements need to be restated to reflect the new accounting principle....