Two Supreme Court Cases Could Change the Tax Landscape: Kiplinger Tax Letter
The Supreme Court’s new term started October 2. There are some interesting cases on its docket. Two could majorly change the tax landscape.

Getting the right tax advice and tips is vital in the complex tax world we live in. The Kiplinger Tax Letter helps you stay right on the money with the latest news and forecasts, with insight from our highly experienced team (Get a free issue of The Kiplinger Tax Letter or subscribe). You can only get the full array of advice by subscribing to the Tax Letter, but we will regularly feature snippets from it online, and here is one of those samples…
The Supreme Court’s new term started October 2. There are some interesting cases on its docket. Two could majorly change the tax landscape.
First, is taxing unrealized income valid? This has come up in a case in which a couple who are minority owners of an Indian corporation were charged the repatriation tax. The 2017 tax law assessed a mandatory one-time tax of up to 15.5% on previously untaxed offshore accumulated earnings of many U.S.-owned foreign corporations. The tax was due from U.S. owners based on their ownership, regardless of whether they got a distribution. The couple asserts that because the tax is assessed on unrealized earnings, it’s not an income tax and must be apportioned among the states to be a constitutional tax under the Sixteenth Amendment.

Sign up for Kiplinger’s Free E-Newsletters
Profit and prosper with the best of expert advice on investing, taxes, retirement, personal finance and more - straight to your e-mail.
Profit and prosper with the best of expert advice - straight to your e-mail.
We don’t know whether the Court’s ultimate ruling will be broad or narrow. If it’s a broad ruling that taxing unrealized income is unconstitutional many provisions in the federal tax laws could be implicated. Among them:
- Taxation of pass-through income from partnerships and LLCs
- Original issue discount on zero-coupon bonds
- Mark-to-market rules for securities dealers
- Numerous statutes impacting U.S. multinationals, as well as foreign companies doing business in the U.S
- The new 15% minimum tax on adjusted book income of large corporations
A broad ruling from the Supreme Court could also put a dent in some Democrats' efforts to hit the rich with a wealth tax or to impose a mark-to-market tax regime on assets of wealthy individuals.
A second case involves the judicial deference given to government regulations. The petitioners in the case want the Court to curb or overrule the Chevron doctrine, which is derived from a 40-year-old high court case that says when a federal statute is ambiguous, a reasonable interpretation by the agency writing the regulations will be upheld.
The case now before the Court involves the regulation of commercial fishing boats. It doesn’t deal directly with taxes. However, if the Court reverses or pares back the Chevron doctrine, it would greatly impact the IRS’s and Treasury’s rulemaking going forward. And more taxpayers will be emboldened to sue the IRS, challenging its regulations.
The Court might also rule on three other tax cases if it chooses to take them:
Can the state of Washington impose a 7% capital gains tax on high earners? Opponents claim the tax is an improper property tax on income. The state’s high court disagreed, saying it was not an unlawful property tax, but instead a valid excise tax.
Is a return that’s given to an IRS agent filed for statute-of-limitation purposes?
A revenue agent notified a partnership in 2005 that the IRS had never received the firm's Form 1065 for 2001. The partnership then faxed the return to the agent, who audited it. In 2010, the agent sent the partnership a notice of adjustment. The partnership claimed the notice was invalid because it was issued more than three years after the partnership faxed its return to the agent. An appeals court ruled that because the partnership’s tax return wasn’t filed with the IRS's service center, no return was actually filed by the partnership for 2001.
For purposes of valuing a decedent’s shares in a closely held corporation, when do life insurance proceeds increase the estate tax value of the stock?
Two brothers who owned a corporation entered into a stock purchase agreement that required the company to acquire all the shares of the first brother to die. The firm bought life insurance to make sure it had enough cash to acquire the stock. Upon the death of one of the brothers, the company used the life insurance proceeds to purchase the decedent's shares. An appeals court disregarded the share value formula in the stock purchase agreement and added the corporate-owned life insurance proceeds when valuing the decedent’s shares in the corporation for estate tax purposes.
This first appeared in The Kiplinger Tax Letter. It helps you navigate the complex world of tax by keeping you up-to-date on new and pending changes in tax laws, providing tips to lower your business and personal taxes, and forecasting what the White House and Congress might do with taxes. Get a free issue of The Kiplinger Tax Letter or subscribe.
Related stories
- Unrealized Gains Supreme Court Case Could Change Wealth Taxes
- Are Capital Gains Taxes Headed to the Supreme Court?
- Courts to Rule on Agency Powers: The Kiplinger Letter
Profit and prosper with the best of Kiplinger's advice on investing, taxes, retirement, personal finance and much more. Delivered daily. Enter your email in the box and click Sign Me Up.

Joy is an experienced CPA and tax attorney with an L.L.M. in Taxation from New York University School of Law. After many years working for big law and accounting firms, Joy saw the light and now puts her education, legal experience and in-depth knowledge of federal tax law to use writing for Kiplinger. She writes and edits The Kiplinger Tax Letter and contributes federal tax and retirement stories to kiplinger.com and Kiplinger’s Retirement Report. Her articles have been picked up by the Washington Post and other media outlets. Joy has also appeared as a tax expert in newspapers, on television and on radio discussing federal tax developments.
-
The Y Rule of Retirement: Why Men Need to Plan Differently
If you have a Y chromosome (because you're a guy), following the 'Y rule of retirement' can help you transition to this new life stage with grace.
-
Retire on This Island for Mediterranean Living on the Cheap
This independent nation has a lower cost of living and more visa options than many of its Mediterranean cousins.
-
Ask the Editor, August 8: Tax Questions on Roth IRA Conversions
Ask the Editor In this week's Ask the Editor Q&A, we answer tax questions from readers on converting a traditional IRA to a Roth IRA.
-
Ask the Editor, August 1: Tax Questions on Standard Deductions
Ask the Editor In this week's Ask the Editor Q&A, we answer tax questions from readers on claiming standard deductions on your tax return.
-
Ask the Editor, July 25: Questions on Four New Tax Deductions
Ask the Editor In this week's Ask the Editor Q&A, we answer tax questions from readers on four new tax deductions in the "One Big Beautiful Bill."
-
Five Ways Trump’s 2025 Tax Bill Could Boost Your Tax Refund (or Shrink It)
Tax Refunds The tax code is changing again, and if you’re filing for 2025, Trump’s ‘big beautiful’ bill could mean a bigger refund, a smaller one or something in between next year. Here are five ways the new law could impact your bottom line.
-
Ask the Editor, July 18: Questions on the $6,000 Senior Deduction
Ask the Editor In this week's Ask the Editor Q&A, we answer tax questions from readers on the new $6,000 deduction for taxpayers 65 and older.
-
Ask the Editor, July 17: Tax Questions on the New Tax Law
Ask the Editor In this week's Ask the Editor Q&A, we answer tax questions from readers on the new tax law.
-
Ask the Editor, July 4: Tax Questions on Inherited IRAs
Ask the Editor In this week's Ask the Editor Q&A, we answer tax questions from readers on the rules on inheriting IRAs.
-
IRS Watchdog: Three Problems the IRS Must Address in 2025
IRS The tax season is over, but new changes to the IRS can pose risks to your taxpayer experience.