arm's length principle
The standard requiring transactions between related parties to be priced as if they were between unrelated parties acting in their own self-interest.
Example
“Tax authorities challenged the royalty payments as violating the arm's length principle — the rate was far below market rates.”
Memory Tip
ARM'S LENGTH = price it like you would with a stranger. No sweetheart deals between related parties.
Why It Matters
Understanding the arm's length principle matters because it affects how you report income and expenses if you conduct business with family members or related entities. Tax authorities use this standard to prevent people from artificially lowering their taxable income through favorable deals with relatives, which protects the fairness of the tax system for everyone.
Common Misconception
Many people mistakenly believe they can charge whatever price they want when doing business with family members without tax consequences. In reality, tax authorities scrutinize related-party transactions and expect them to be priced at fair market value, the same as transactions between strangers, or they may deny deductions and assess penalties.
In Practice
Suppose you own a business and rent office space from your brother for 500 dollars per month when similar commercial space in the area rents for 2000 dollars per month. The IRS would likely challenge this arrangement and require you to pay fair market rent, potentially disallowing your low-rent deduction and requiring back taxes plus interest and penalties on the difference.
Etymology
ARM'S LENGTH (at a distance, without special treatment). Transacting at ARM'S LENGTH — as strangers would.
Common Misspellings
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Related Terms
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See Also
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