A more thorough explanation:

The business-purpose doctrine is a principle in tax law that requires a transaction to have a legitimate business purpose in order to qualify for favorable tax treatment. This means that a transaction cannot be solely for the purpose of avoiding taxes.

For example, if a company restructures its operations solely to take advantage of a tax loophole, without any legitimate business reason for doing so, the transaction may be subject to scrutiny by the IRS and could be disallowed for tax purposes.

Another example could be a wealthy individual setting up a shell company in a tax haven solely to avoid paying taxes on their income. This would not be considered a legitimate business purpose and could result in penalties and fines.

The business-purpose doctrine is in place to prevent individuals and companies from abusing the tax system and taking advantage of loopholes for their own benefit. It ensures that transactions are conducted for legitimate business reasons and not solely for tax avoidance purposes.