Arm's-Length Transaction

An arm's-length transaction is a transaction between parties who are independent of each other and bargain in their own interests, so that its terms reflect what the market would set. The phrase describes a standard rather than a type of transaction: in tax law, a deal between related parties is measured against what unrelated parties would have done under the same circumstances.

No issuing body defines the term once for all purposes. The Treasury regulations use it inside particular rules: the gift tax regulation treats a sale made "in the ordinary course of business (a transaction which is bona fide, at arm's length, and free from any donative intent)" as made for full value, and the related-company pricing regulation applies "the arm's length standard" to every transaction between commonly controlled businesses. It is closely tied to fair market value, which is defined as the price a willing buyer and a willing seller would agree on.

Why related parties are different. Between strangers, a low price is usually just a good deal for the buyer. Between a parent and a child, or two companies with the same owner, a low price can be a way to move value without calling it a gift, salary or dividend. The tax law therefore asks whether the terms match what independent parties would have agreed and, when they do not, taxes the transaction by what it really accomplished.

Gifts hidden in sales. Under 26 CFR 25.2512-8, the gift tax reaches "sales, exchanges, and other dispositions of property for a consideration to the extent that the value of the property transferred by the donor exceeds the value" of what was received. Selling a house to a son for less than it is worth is a sale and a gift at the same time. Love and affection are "wholly disregarded" as consideration.

Where else the standard applies.

• Family business agreements. Under section 2703, an option, buy-sell agreement or restriction is ignored in valuing property for estate and gift tax unless it is a bona fide business arrangement, not a device to transfer property to family for less than full value, and its terms "are comparable to similar arrangements entered into by persons in an arms' length transaction."
• Related businesses. Section 482 lets the IRS reallocate income between commonly controlled businesses so that their dealings produce what the regulation calls an "arm's length result".
• Owner pay. An S corporation owner who works in the business must be paid reasonable compensation, judged by what the business would pay an unrelated person for the same work.
• Startup stock. A private company's stock is valued for option grants under section 409A using factors that include recent arm's-length sales of its shares.
• Family rentals. A home rented to a relative for use as their main home counts as a rental, not personal use, only for periods when it is rented "at a fair rental" under section 280A(d)(3). Below-market rent means the owner's rental deductions are limited.
• Family loans. A loan at below-market interest is measured against the applicable federal rate, and the forgone interest can be treated as a gift and as interest income.

When arm's length is not enough. Some rules turn on who the parties are, not on the price. An IRA that sells property to, leases property from or lends money to a disqualified person, such as the owner or a family member, enters a prohibited transaction under section 4975 whatever the price, and a loss on a sale between family members is disallowed by section 267 even at full value. Arm's-length terms help defend a family deal but do not unlock these.

Evidence. Because the standard is hypothetical, it is proven with comparables: appraisals, recent sales of similar property, market rent surveys, the interest rates lenders charge unrelated borrowers, and written terms that are actually followed.

1. Identify the relationship. Family members, a business and its owner, commonly controlled companies, or a retirement account and its owner are the usual cases.

2. Establish the market terms. Get an appraisal or comparable sales for property, market rent for a rental, the applicable federal rate or a lender's rate for a loan, or salary data for compensation.

3. Compare the deal. Any shortfall from market terms is the amount the tax law may treat as something else: as a gift, as compensation or a dividend, or as forgone interest.

4. Document it. Put the terms in writing and follow them, with payments actually made on schedule.

Consider an example. Marta and Luis sell a house worth $400,000 to their daughter for $250,000. Under the gift tax regulation, the $150,000 by which the house's value exceeds the price ($400,000 minus $250,000) is a gift, so the parents need to report it on a gift tax return even though the deed shows a sale. Had they sold at $400,000, with the daughter paying through a mortgage or a properly documented family loan, there would be no gift.

A rental version: their son rents their condo as his home for $900 a month when comparable units rent for $1,600. Because the rent is not a fair rental, his days in the unit count as the parents' personal use, which limits the rental deductions they can take.

Pros

• Gives families and closely held businesses a clear benchmark: market terms, documented, are generally respected.
• Protects a sale, loan or rental from being recast as a gift or disguised compensation.
• Rests on evidence that can be gathered in advance, such as appraisals and comparables.

Cons

• There is no single definition, so the test and its consequences differ by rule.
• Proving market terms costs money, and for unique property the comparables may be thin.
• Some arrangements, like an IRA dealing with its owner or a loss sale to a relative, are restricted regardless of the price.
• A deal at full market terms may defeat the family's purpose, such as helping a child into a home, which then has to be done openly as a gift.