There are multiple results for "Income Tax 551," and the meaning of the term depends on the context. Here are some possible interpretations:

• ATO Community: "Income Tax 551" refers to your personal tax account where the Australian Taxation Office (ATO) processes your tax returns.

• IRS Publication 551: This publication discusses basis, which is the amount of your investment in property for tax purposes. It covers topics such as cost basis and adjusted basis.

• IRS Topic No. 551: This topic covers the standard deduction, which is a specific dollar amount that reduces the amount of income on which youre taxed.

• IRC Sec. 551: This section of the Internal Revenue Code (IRC) deals with foreign personal holding company income taxed to United States shareholders. However, it has been repealed.

• MCA Sec. 15-31-551: This section of the Montana Code Annotated (MCA) specifies that certified copies of corporate income tax returns can be provided to taxpayers for a fee.

Without more information about the context in which "Income Tax 551" was mentioned, it is difficult to determine which of these interpretations is correct.