Income Tax Folio S4-F8-C1, Business Investment Losses

One-half of this loss is an allowable business investment loss (ABIL).

Unlike ordinary allowable capital losses, an ABIL for a tax year may be deducted from all sources of income for that year. Generally, an ABIL that cannot be deducted in the year it arises is treated as a non-capital loss. A non-capital loss arising from an ABIL can be carried back three years and forward up to ten years to be deducted in calculating taxable income of such other years. Any such loss that is not deducted by the end of the ten-year carryforward period is then treated as a net capital loss, which can be carried forward indefinitely to be deducted against taxable capital gains.

Ordinary allowable capital losses for a tax year may be deducted only from taxable capital gains realized in the year. If the allowable capital losses exceed the taxable capital gains, the difference is a net capital loss which may be carried back three years and forward indefinitely to be deducted only against taxable capital gains.

The purpose of the rules relating to the business investment loss is to encourage investment in SBCs by giving such losses more generous tax treatment than that available for ordinary capital losses.

This Chapter discusses the various provisions of the Act relevant to determining a taxpayer's ABIL for a tax year and the deductibility of such a loss. The content is technical in nature and some of the topics discussed in this Chapter may not be relevant for all taxpayers. Those wanting a more general overview of the subject matter may prefer to read Guide T4037 , Capital Gains. Chart 6 in Chapter 5 of Guide T4037 can be used to compute an ABIL.

The Canada Revenue Agency (CRA) issues income tax folios to provide a summary of technical interpretations and positions regarding certain provisions contained in income tax law. Due to their technical nature, folios are used primarily by tax specialists and other individuals who have an interest in tax matters. While each paragraph in a chapter of a folio may relate to provisions of the law in force at the time it was written (see the Application section), the information provided is not a substitute for the law. The reader should, therefore, consider the Chapter’s information in light of the relevant provisions of the law in force for the particular tax year being considered.

The CRA may have published additional guidance and detailed filing instructions on matters discussed in this Chapter. See the CRA Forms and publications web page for this information and other topics that may be of interest.

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