Income Shifting

Income shifting is arranging matters so that income is taxed on a different person's return, usually one facing a lower marginal rate. Within the broader activity of tax planning, which works along three axes — the timing of income, its character, and whose return it lands on — income shifting is that third axis.

The name needs two clarifications, because it points in two wrong directions at once. First, it is not a term in the Internal Revenue Code. Second, the IRS does use the phrase, for a different subject: a paper in its own Research Bulletin is titled "Income-Shifting by U.S. Multinational Corporations," and the congressional tax committees use it the same way, for profits moved between countries through transfer pricing and intangible property. A reader who searches the phrase and lands on transfer-pricing material has not found the wrong page; they have found the other meaning.

The name that is official belongs to the doctrine that limits the practice. As the IRS puts it in Revenue Ruling 2002-22: "As first enunciated in Lucas v. Earl, 281 U.S. 111 (1930), the assignment of income doctrine provides that income is ordinarily taxed to the person who earns it, and that the incidence of income taxation may not be shifted by anticipatory assignments." The IRS's own sentence uses the verb, which is the bridge between the popular name and the legal one.

Four separate bodies of law constrain this, and they do different jobs. Treating them as one anti-abuse rule is how a plan that survives three of them fails the fourth.

1. The assignment-of-income doctrine, in two Supreme Court sentences. In Lucas v. Earl a husband and wife had contracted that all their earnings would be held jointly. Justice Holmes wrote that the statute could "tax salaries to those who earned them and provide that the tax could not be escaped by anticipatory arrangements and contracts however skilfully devised to prevent the salary when paid from vesting even for a second in the man who earned it," and that no distinction could be drawn "according to the motives leading to the arrangement by which the fruits are attributed to a different tree from that on which they grew." Ten years later Helvering v. Horst extended the principle from earned income to income from property, holding that "the power to dispose of income is the equivalent of ownership of it. The exercise of that power to procure the payment of income to another is the enjoyment and hence the realization of the income by him who exercises it." Horst had detached interest coupons from bonds he kept and given the coupons to his son.

Read together, the two cases draw the line the entire subject turns on. Earl covers services: you cannot give away your salary. Horst covers property: you cannot give away the yield while keeping the thing that produces it. What you can do is give away the tree. Transfer the asset itself, completely and permanently, and the income it produces afterwards is the new owner's income.

The doctrine is not unlimited, and the IRS says so in its own words. Revenue Ruling 2002-22 continues: "the courts and the Service have long recognized that the assignment of income doctrine does not apply to every transfer of future income rights," citing Rubin v. Commissioner, Hempt Bros., Inc. v. United States, and Revenue Ruling 80-198. The concession is worth knowing precisely because it comes from the enforcer.

2. The kiddie tax, section 1(g). Its official heading is "Certain unearned income of children taxed as if parent's income"; "kiddie tax" is nowhere in the statute. It exists to answer the most obvious version of the strategy, which is putting investments in a child's name. Section 1(g)(1) computes the child's tax as the greater of the tax without the subsection, or the tax on income reduced by net unearned income plus the child's share of the parent's tax on that unearned income. The reach is set by section 1(g)(2): a child under 18 at the close of the year, or 18 and older who meets the age requirements of section 152(c)(3) and whose earned income does not exceed half of their own support, where at least one parent is alive and the child does not file jointly. Section 1(g)(4)(A)(ii) sets the offset by reference to the section 63(c)(5)(A) amount, which is $1,350, and it subtracts that amount twice, which is why the commonly quoted threshold is double the published figure; the parental-election band in section 1(g)(7) runs from that amount to ten times it.

Two things matter for anyone reading older material. It reaches unearned income only, so a child's wages are outside it entirely. And the version that taxed a child's unearned income at trust and estate rates was law for 2018 and 2019 only: section 1(j)(4) was repealed by the SECURE Act, restoring the parental-rate mechanism. Any source describing the kiddie tax as using trust rates is describing two tax years that have passed. The rule is covered in full on its own page.

3. Section 704(e), and a citation almost everyone gets wrong. This is the partnership answer to the strategy, and its architecture changed in 2015. The subsection's heading is now "Partnership interests created by gift"; before the Bipartisan Budget Act of 2015 it read "Family partnerships." That Act also struck out the old paragraph (1) — the rule that "a person shall be recognized as a partner for purposes of this subtitle if he owns a capital interest in a partnership in which capital is a material income-producing factor, whether or not such interest was derived by purchase or gift from any other person" — and renumbered the survivors. So the provision routinely cited as "section 704(e)(1)" for partner recognition no longer exists, and secondary sources written before 2015 cite a repealed paragraph.

What survives, now section 704(e)(1), is the substantive limit: for a partnership interest created by gift, the donee's distributive share is includible in their gross income "except to the extent that such share is determined without allowance of reasonable compensation for services rendered to the partnership by the donor," and except to the extent the share attributable to donated capital is proportionately greater than the donor's own. In plain terms: the donor must be paid properly for the work they still do before the profits can be allocated to the donee, and the donee's share cannot be disproportionate to the capital they were given. Section 704(e)(2) closes the obvious workaround by treating a purchase between family members as created by gift from the seller, with "family" limited to "his spouse, ancestors, and lineal descendants, and any trusts for the primary benefit of such persons."

4. Below-market loans, section 7872. Lending money to a family member at no interest is a shift of investment income if it works, so the Code treats the interest that was not charged as if it had been paid. Section 7872(a)(1) treats forgone interest as "transferred from the lender to the borrower, and … retransferred by the borrower to the lender as interest." The rule has its own de minimis threshold and, for gift loans, a cap tied to the borrower's investment income; the mechanics belong on the page for an intrafamily loan.

Where the boundary of lawfulness sits is a separate question from whether a particular technique works. Arranging affairs to reduce tax is lawful; what the courts and the Code police is a transaction whose only real content is the tax result. That distinction has its own page.

The workable routes have one thing in common: something real changes hands, or real work is really done. Four are worth naming, with their limits attached.

Transferring an income-producing asset outright. Give the asset, not the yield. The income it produces afterwards belongs to the new owner. The limits are that the gift has to be complete, that it may be reportable on a gift tax return above the annual exclusion, that the recipient takes carryover basis so the built-in gain travels with the asset, and that a transfer to a minor child runs into the kiddie tax.

Gifting an appreciated asset before a sale rather than after. A donor who plans to sell and hand over the proceeds can instead hand over the asset and let the recipient sell. The gain is then taxed on the recipient's return at their rates. The constraints are real: the recipient's basis is the donor's, the donor must genuinely relinquish control before the sale rather than gifting the sale proceeds in substance, and the kiddie tax removes most of the benefit where the recipient is a minor child.

Employing a family member who actually works. Wages for genuine services at a reasonable rate are deductible to the business and taxable to the worker at their rates, and earned income is outside the kiddie tax. The word doing the work is "reasonable": pay unconnected to services performed is not compensation, and it is the first thing an examination looks at.

Funding a child's Roth IRA from their earned income. Where a child has genuine earned income, a contribution can be made up to the lesser of that earned income and the annual limit, regardless of whose cash is used. This is less a shift than a redirection, and it is constrained by the requirement that the earned income be real.

A hypothetical showing the line the doctrine draws. Suppose Marisol owns corporate bonds paying $6,000 of interest a year. Her marginal rate is 32 percent, so the interest costs her $1,920 in federal income tax annually. Her adult son's marginal rate is 12 percent.

Version one, which fails. She keeps the bonds and instructs the issuer to pay the interest to her son, or detaches the coupons and gives him those. This is Helvering v. Horst on its own facts. She retains the asset, and the power to direct the income is treated as enjoyment of it, so the $6,000 remains her income and she still owes the $1,920. Her son has received a gift, not income.

Version two, which works. She gives her son the bonds. From then on the interest is his, taxed at his rate: $6,000 at 12 percent is $720, against the $1,920 she would have paid, a difference of $1,200 a year. But this version costs her something the first one did not. She no longer owns the bonds, cannot get them back, cannot spend the interest, and has made a gift that counts against the annual exclusion and may require a return. That is not a technicality; it is the price of the result, and it is the reason the two versions are taxed differently.

The general test that falls out of this: if the arrangement leaves you still owning the thing that generates the income, it does not work. If it does not leave you owning it, it works, and you have genuinely given something away.

Where it genuinely works

• A completed transfer of an income-producing asset moves the income permanently, with no annual filing and no continuing arrangement to maintain.
• Wages to a family member for real work are deductible to the business and taxed to the worker, and earned income sits outside the kiddie tax entirely.
• Between adults with a wide rate gap, and particularly where a recipient's capital gains would be taxed at a lower rate, the arithmetic can be substantial.
• A child's earned income can support a Roth IRA contribution regardless of whose cash funds it, which converts a modest shift into decades of tax-free growth.

The costs and the constraints

• Every version that keeps the asset fails. Assigning income while retaining what produces it is the one thing the doctrine most reliably defeats.
• A completed gift is irreversible. The recipient may spend it, divorce over it, or lose it to a creditor, and the giver has no recourse.
• The recipient takes carryover basis, so the deferred gain travels with the asset and reappears on their return.
• The kiddie tax removes most of the benefit of shifting investment income to a minor child, which is the version most people think of first.
• "Reasonable compensation" is the pressure point in both the family-employment and the family-partnership routes, and it is a judgment rather than a formula.
• A large gift may consume lifetime exclusion and require a gift tax return even though no tax is due.
• Shifting income also shifts control, and for many families that is the binding constraint rather than the tax result.