Raising tax rates on the rich produces less revenue than the projections promise, and the reason taxing the rich doesn’t work as advertised is structural: the wealthiest Americans earn most of their economic gains in forms the income tax barely reaches, and the code itself supplies legal ways to defer, shrink, or erase whatever remains. The top federal rate in 2026 is 37% on ordinary income above $640,600 for single filers, but that rate only bites when income is actually realized in a taxable form.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 For someone whose wealth is stock, real estate, or a private business, the statutory top rate is often beside the point.
The Rate on Paper Is Not the Rate People Pay
The 37% top bracket covers wages and business profits. Long-term capital gains and qualified dividends top out at 20%, and even that rate applies only when the underlying asset is sold.2Internal Revenue Service. Topic No. 409, Capital Gains and Losses An asset can double or triple in value over a decade without producing a dollar of taxable income, provided the owner does not sell.
The Treasury Department estimates the annual tax gap at roughly $600 billion, and academic researchers attribute more than $160 billion of that to unpaid tax from the top 1%.3U.S. Department of the Treasury. The Case for a Robust Attack on the Tax Gap Not all of that is illegal evasion. A large share flows through structures Congress wrote into the code on purpose. Raising the statutory rate does nothing about a gap created by mechanisms that keep the rate from ever triggering.
Buy, Borrow, Die
The single most powerful reason rate increases underperform has a plain name. Wealthy taxpayers buy appreciating assets, borrow against them when they need cash, and hold them until death.
The mechanics are simple. The owner buys stock, real estate, or another asset that grows in value. As it appreciates, no sale happens, so no capital gains tax is triggered. When cash is needed, the owner takes out a securities-backed line of credit or a mortgage against the portfolio. Loan proceeds are not taxable income, because the borrower has an offsetting obligation to repay. Interest on the loan is often well below what the tax on a sale would have cost.
The final step matters most. When the owner dies, inherited assets get a stepped-up basis equal to their fair market value on the date of death.4Office of the Law Revision Counsel. 26 USC 1014 – Basis of Property Acquired From a Decedent Every dollar of appreciation that built up during the owner’s life is erased from the tax base. Heirs can sell immediately at zero capital gains, pay off the loans with the proceeds, and start the cycle again.
Raising the capital gains rate from 20% to 30% or 40% has no effect on someone who never sells. The tax reaches only realized gains, and this approach ensures nothing is ever realized.
Legal Tools That Shrink the Taxable Base
Alongside the buy-borrow-die pattern, the code offers a menu of provisions that let sophisticated taxpayers reduce or defer what would otherwise be taxable. Most were written to encourage specific economic behavior. Used together, they can drop an effective tax rate well below what the bracket tables suggest.
Like-Kind Exchanges
Under Section 1031, a real estate investor can sell a property and defer the entire capital gains tax by rolling the proceeds into another qualifying property.5Internal Revenue Service. Like-Kind Exchanges – Real Estate Tax Tips Chained across a career, these exchanges defer gains for decades. Combined with the step-up at death, they may never be taxed.
Tax-Loss Harvesting
Investors sell losing securities to offset gains elsewhere. Excess losses can offset up to $3,000 of ordinary income each year, with the rest carried forward indefinitely. For a large portfolio, harvesting is close to mechanical, and it directly cuts income exposed to the 20% long-term rate.2Internal Revenue Service. Topic No. 409, Capital Gains and Losses
Grantor Retained Annuity Trusts
A GRAT lets a wealthy individual transfer appreciating assets to heirs while using little or none of the lifetime gift and estate tax exclusion. Assets go into the trust, the grantor takes fixed annuity payments for a set term, and whatever remains at the end passes to beneficiaries free of gift and estate tax. If the assets outperform the IRS’s assumed interest rate over the term, the excess growth moves to heirs untaxed.
Qualified Opportunity Zones
Investors who roll capital gains into a Qualified Opportunity Fund can defer tax on those gains. Deferred gains must be recognized by December 31, 2026, with a 10% basis increase after five years and 15% after seven.6Office of the Law Revision Counsel. 26 USC 1400Z-2 – Special Rules for Capital Gains Invested in Opportunity Zones Investments held at least ten years can exclude all future appreciation from tax. Congress extended the program for investments made after 2026, with a five-year deferral window and enhanced incentives for rural funds.
Section 1202 Small Business Stock
Founders and early investors in qualifying small businesses can exclude up to 100% of capital gains when selling stock held for at least five years. For shares issued after July 4, 2025, the per-issuer cap is $15 million, and the company must have had gross assets under $75 million when the stock was issued. Millions of dollars in startup gains can leave the federal tax base entirely.
None of these tools is a secret, and each works on its own. The impact comes from stacking. An investor might defer real estate gains through a 1031, harvest losses in the stock portfolio, shelter startup proceeds under Section 1202, and park other gains in an Opportunity Zone fund. The statutory rate matters less and less as the taxable base contracts.
Why the AMT Backstop Misses
Congress built the Alternative Minimum Tax to keep high earners from zeroing out their tax bill with deductions and preferences. The AMT recalculates liability under a stricter set of rules and charges the higher of the two amounts. In 2026, the AMT exemption is $90,100 for single filers, phasing out at $500,000 of AMT income.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
The AMT has the same blind spot as the regular income tax. It only reaches realized income. Someone whose net worth grew by $50 million in unrealized stock appreciation owes nothing under either system. The AMT also tends to catch upper-middle-income earners with large state tax deductions or incentive stock option exercises, not billionaires whose income is engineered around deferral. As a backstop, it hits the wrong people.
Capital and Citizens Can Leave
Rate increases assume the taxpayer stays. The wealthiest taxpayers have exit options most people do not. They can relocate to jurisdictions with lower rates, and at the extreme they can renounce U.S. citizenship. The United States taxes citizens on worldwide income wherever they live, so a move abroad without giving up the passport does not shrink the federal bill.7Internal Revenue Service. Frequently Asked Questions About International Individual Tax Matters Only full expatriation escapes the system.
Congress built in a toll. The exit tax under Section 877A treats a covered expatriate’s property as sold at fair market value the day before departure, generating an immediate tax on unrealized gains.8Office of the Law Revision Counsel. 26 U.S. Code 877A – Tax Responsibilities of Expatriation A $910,000 exclusion applies in 2026. For someone worth hundreds of millions, that exclusion barely registers, and the one-time hit is real. But the government forfeits every future dollar of income, capital gains, and estate tax that person would have generated. The exit tax collects a fraction now in exchange for a much larger stream later.
Tracking assets held offshore by citizens who stay has improved through the Foreign Account Tax Compliance Act, which requires foreign financial institutions to report accounts held by U.S. persons.9Internal Revenue Service. Foreign Account Tax Compliance Act (FATCA) FATCA cannot prevent physical departure, and rising domestic rates raise the incentive to look for a friendlier jurisdiction.
Why Wealth Taxes Run Into Walls
Some proposals bypass the income tax and target net worth directly. A 2% annual tax on a $10 billion fortune sounds like $200 million a year. Collecting it runs into problems no rate can solve.
Most of the wealth held by the richest Americans sits in assets with no clean market price. Private company stock, commercial real estate, farmland, and art do not trade on an exchange. Valuing them requires professional appraisals guided by IRS standards like Revenue Ruling 59-60, which lists factors but rejects any mechanical formula. Two qualified appraisers can reach numbers millions of dollars apart on the same company, and the IRS regularly challenges taxpayer valuations in court.
Family limited partnerships add another layer. When a family transfers business interests to heirs as minority stakes, those stakes carry valuation discounts of 15% to 40% for lack of control and 10% to 30% for lack of marketability. A $100 million interest can be valued at $45 million to $75 million for tax purposes. The discounts are legally defensible and widely used, and they mean the taxable value of an estate can be a fraction of its economic worth.
Even with valuation solved, a wealth tax demands cash from people whose assets do not produce cash. Forcing a founder to sell part of a private company each year to pay the bill can damage the business and hurt employees who had no say. Large forced sales of real estate or private equity stakes could push prices down across whole sectors. Most existing taxes rely on a transaction to generate both the tax event and the money to pay it. Wealth taxes break that link.
The Constitution Has Not Settled the Realization Question
Proposals to tax unrealized appreciation face a legal obstacle before they face a policy one. The Sixteenth Amendment gave Congress power to tax “incomes, from whatever source derived,” but whether “income” requires realization has never been conclusively resolved.10National Archives. 16th Amendment to the U.S. Constitution – Federal Income Tax
The Supreme Court had a chance to answer the question in 2024 in Moore v. United States, a challenge to the Mandatory Repatriation Tax from the 2017 tax law. The Court upheld the tax and deliberately avoided the larger issue, ruling that the MRT reached income the corporation had already realized, which was then attributed to shareholders. On whether Congress can tax gains that have never been realized by anyone, the Court said nothing.11Supreme Court of the United States. Moore v. United States, No. 22-800 Any federal wealth tax or mark-to-market proposal for individuals sits on uncertain constitutional ground. That uncertainty alone deters Congress, because years of legislative work could be undone by a single opinion.
Enforcement Costs Cap What Gets Collected
Even under current law, the IRS struggles to collect what wealthy taxpayers owe. The agency’s Large Business and International division handles returns from taxpayers and entities with assets of $10 million or more, including multi-layered partnerships, international structures, and complex investment vehicles.12Internal Revenue Service. Large Business and International Division at a Glance A single audit can take years and generate thousands of pages of documents. Disputes routinely end up in Tax Court, with specialized attorneys billing hundreds of dollars an hour on both sides.
Treasury directed the IRS to audit at least 8% of returns from individuals earning over $10 million, up from much lower rates in prior years.13U.S. Government Accountability Office. Opportunities Exist to Improve IRS High-Income/High-Wealth Audits Higher targets do not automatically mean proportional revenue. These cases are expensive, the taxpayers have sophisticated counsel, and the legal arguments are genuinely complex. When collection costs approach the revenue produced, the policy is close to a wash. New taxes on the wealthy would pile more work onto an agency that already cannot fully enforce the law as written.
The Behavioral Response Moves the Target
Higher rates on investment returns change the math for anyone deciding whether to deploy capital. When the government takes a larger share of the upside, the risk-adjusted return falls, and some investments that would have been worthwhile no longer clear the bar. Economists call this deadweight loss: gains-from-trade that never happen because the tax makes them unprofitable.
This does not mean any tax above zero kills growth. The question is where the tipping point falls, and honest economists disagree. Some research places the revenue-maximizing top rate well above current levels; other estimates put it in the mid-30s. Less contested is the response at the margin. When rates on capital gains, dividends, and business income rise, the wealthiest taxpayers accelerate deferral, hold assets longer, and shift investment toward tax-advantaged vehicles. The rate goes up. Reported taxable income goes down.
Congress raises rates expecting a yield based on static projections. Taxpayers change behavior, and collections come in short. The complexity then invites new avoidance, which prompts new legislation, which creates new complexity. The underlying problem is not that rates are too high or too low. It is that the system relies on voluntary realization of income by people who have every legal tool and every financial incentive not to realize it.