A core feature of progressive taxation is that higher incomes face higher marginal rates. Taxpayers have naturally tried to spread their income among family members in lower brackets—and courts have developed powerful doctrines to stop them. The “assignment of income” doctrine, which actually prevents assignment of income, began with a 1930 Supreme Court case involving a creative California couple and has remained a cornerstone of tax law ever since.
Lucas v. Earl: The Tree and Its Fruit
In 1901, long before the modern income tax, Guy Earl and his wife entered a contract declaring that all property either of them then owned or might later acquire—including “earnings (including salaries, fees, etc.)”—would be “treated and considered, and hereby is declared to be received, held, taken, and owned by us as joint tenants.”
When the federal income tax came into force, Earl argued that only half of his salary and legal fees should be taxed to him. The other half belonged to his wife under their binding contract.
The Supreme Court, in Lucas v. Earl, 281 U.S. 111 (1930), rejected this argument in an opinion by Justice Holmes that has become legendary for its tree-and-fruit metaphor:
“There is no doubt 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 skillfully devised, to prevent the salary when paid from vesting even for a second in the man who earned it. … we think that no distinction can be taken according to the motives leading to the arrangement by which the fruits are attributed to a different tree from that on which they grew.”
The doctrine is simple: Income is taxed to the person who earns it, regardless of any contractual assignment of the right to receive payment.
Community Property States: The Seaborn Exception
The same year Earl was decided, the Court confronted a superficially similar but legally distinct situation. In Poe v. Seaborn, 282 U.S. 101 (1930), a Washington state couple lived under that state’s community property laws. Under Washington law (and similar laws in other community property states), all property acquired during marriage—including salaries and wages—belongs equally to both spouses as a matter of state property law, not by private contract.
The Court held that the wife owned one-half of her husband’s earnings “by law, not by contract.” Therefore, each spouse properly reported half the community income on separate returns. The distinction was critical: Earl involved a private arrangement to reallocate income that had already been earned or would be earned; Seaborn involved a state-law determination of who legally owned the income at the moment of receipt.
This distinction has shaped tax planning ever since. In community property states, earned income is automatically split for tax purposes. In common law states, it is not—unless the couple files a joint return, which effectively accomplishes income splitting but with different tax rate consequences.
Income from Property: Slicing the Bundle of Rights
The service income cases are relatively straightforward: you can’t assign compensation you haven’t yet received. But what about income from property—dividends, interest, trust distributions? Here, the analysis becomes more nuanced, and the Supreme Court’s decisions reveal the critical distinction between assigning the income and assigning the property that produces the income.
In Helvering v. Horst, 311 U.S. 112 (1940), the taxpayer detached interest coupons from bonds he owned and gave them to his son shortly before their due date. The son collected the interest payments. The Court held the father was taxable on the interest. Why? Because he had merely assigned the right to receive income while retaining ownership of the underlying bonds—the “tree.”
But in Blair v. Commissioner, 300 U.S. 5 (1937), the Court reached the opposite result. Edward Blair was the life beneficiary of a testamentary trust—entitled to all trust income during his life. He assigned specified dollar amounts of future income to his children. The Court held that these assignments shifted the tax liability to the children. Why the different result?
The answer lies in what Blair transferred. Unlike Horst, who retained the bonds (the income-producing asset) and assigned only the interest coupons (the income), Blair transferred “an equitable interest in the corpus of the property”—his entire beneficial interest in the trust, albeit in fractional shares. He had sliced the property vertically, giving away a proportionate interest in everything (both current income and future growth), rather than horizontally, giving away only the income while keeping the underlying asset.
The distinction can be visualized this way:
- Horizontal slicing (Horst): Keep the tree, give away one season’s fruit = income still taxed to the tree’s owner.
- Vertical slicing (Blair): Give away a share of the tree itself (including all present and future fruit from that share) = income taxed to the new part-owner.
The Cliff’s Edge: Retention of Control
A related line of cases addresses situations where the taxpayer retains so much control over the transferred property that, practically speaking, nothing has changed. In Helvering v. Clifford, 309 U.S. 331 (1940), the taxpayer created a five-year trust with himself as trustee, his wife as income beneficiary, and himself as reversioner of the corpus. The Court held the trust income was taxable to him: “He has retired as a donor but remained in control of the management of the trust.”
Similarly, in Corliss v. Bowers, 281 U.S. 376 (1930), the taxpayer reserved the power to revoke the trust “in whole or in part.” Even though he never exercised the power, the Court held the income was taxable to him. The power to reclaim the property was enough to treat him as its owner for tax purposes.
Contingent Fee Arrangements: The Modern Application
The assignment of income doctrine continues to generate litigation in modern contexts. In Commissioner v. Banks, 543 U.S. 426 (2005), the Supreme Court addressed whether a plaintiff who recovers damages under a contingent fee agreement must include the entire recovery (including the portion paid to the attorney) in gross income. The Court held yes—the attorney is the client’s agent, not a joint owner of the claim. The full amount is income to the client, who may then deduct the legal fee subject to applicable limitations.
This matters enormously because of the interaction with Section 67(g), which suspended miscellaneous itemized deductions (including legal fees) for tax years 2018 through 2025. If the fee is income to the client but not deductible, the effective tax rate on the recovery can be significantly higher.
Planning Implications
The assignment of income doctrine means that shifting tax burdens to lower-bracket family members requires careful planning. True vertical gifts (Blair) work; mere income assignments (Horst) don’t. Family partnerships must have economic substance; the partners must actually contribute capital or services. Below-market loans are subject to Section 7872’s imputed interest rules, effectively preventing interest-free wealth transfers.
Perhaps the most common modern application involves the “kiddie tax” under Sections 1(g) and 1(h). When parents transfer appreciated stock to a child, the child’s investment income above certain thresholds is taxed at the parents’ marginal rate—effectively overruling any assignment of income that would otherwise shift the tax burden. Congress has repeatedly expanded this provision, recognizing that the assignment of income doctrine alone couldn’t prevent parents from using children’s lower brackets for investment income.
The tree-and-fruit metaphor remains a powerful analytical tool. But as Blair demonstrates, the doctrine doesn’t prevent all income shifting—only the wrong kind. Slicing off a branch (including its future fruit) works; picking fruit from a tree you still own doesn’t.
Disclaimer: This article provides general information for educational purposes only and does not constitute legal advice. Tax laws, judicial interpretations, and IRS guidance are subject to change at any time through legislation, regulation, or court decision. Readers should consult Alan Goldstein & Associates for advice regarding their specific factual situations.
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