Why the Sanders Khanna 5% Wealth Tax Deserves a Real Debate

I have watched enough tax fights to know how this one is supposed to go. A senator from Vermont and a congressman from Silicon Valley roll out a bill, cable news treats it as theater, a think tank issues a press release calling it unconstitutional, and everyone moves on. Then nothing changes, and the same 938 people keep accumulating wealth at a pace the rest of us cannot fathom. I want to argue that this time we should slow down and actually look at what is being proposed, because the reflex to dismiss it says more about our political imagination than about the merits.

The bill in question is the "Make Billionaires Pay Their Fair Share Act," introduced by Sen. Bernie Sanders (I-VT) and Rep. Ro Khanna (D-CA) on March 3, 2026. It would impose a 5% annual tax on the net worth of anyone holding at least $1 billion. That is a small club, and the numbers attached to it are large. My thesis is simple: whether or not you support it, treating the Sanders Khanna 5% wealth tax as a serious policy question, rather than a punchline, is the only honest way to engage a country where a few hundred people own a slice of national wealth that would have been unimaginable a generation ago.

Nine hundred thirty eight billionaires and $8.2 trillion in wealth

Start with the scale, because the scale is the whole argument. As of January 1, 2026, there were 938 US billionaires holding a collective $8.2 trillion in wealth. That is not a rounding error in the national ledger. It is a concentration of assets in a group small enough to fit in a mid sized concert hall, and it has been growing at a rate that dwarfs the gains of ordinary households.

Economists Emmanuel Saez and Gabriel Zucman, whose modeling underpins the bill, note that billionaire wealth was up 132% over the prior six years as of the end of 2025. Let that figure settle. Over a stretch when many American families were absorbing higher grocery bills, rising rents, and stubborn interest rates, the fortunes at the very top more than doubled. You do not have to believe in class warfare to find that gap worth examining. You only have to believe that numbers mean something.

The individual burdens the bill would create make the abstraction concrete. Under its terms, Elon Musk would owe about $42 billion, Jeff Bezos about $11 billion, and Mark Zuckerberg about $11 billion. Those are staggering sums, and critics will say so loudly. But they are staggering precisely because the underlying fortunes are staggering. A 5% levy only produces a $42 billion bill when someone is sitting on hundreds of billions to begin with.

Mechanics of the Sanders Khanna 5% wealth tax

The mechanics matter more than the slogans, so here is the structure. The tax applies at 5% per year to net worth above the $1 billion threshold. Its sponsors project it would raise $4.4 trillion over the ten year window from 2026 to 2037, which works out to roughly $368.5 billion annually, or about 1.2% of GDP. Notably, that estimate already bakes in a 10% evasion and avoidance rate, an acknowledgment that the very wealthy have accountants and the very wealthy will use them.

The first year revenue has a specific destination. It would fund one time $3,000 direct payments to individuals in households earning $150,000 or less, scaling up to $12,000 for a family of four. That is the retail politics of the bill, the part designed to be felt at a kitchen table rather than debated in a seminar. It is also the part that reframes the conversation: this is not money vanishing into a general fund, it is money routed from the top of the distribution to the middle of it.

Beyond the checks, the sponsors have floated other uses for the revenue stream. These include reversing roughly $1.1 trillion in Medicaid and ACA cuts, capping childcare costs at 7% of family income, and setting a $60,000 minimum salary for public school teachers. You can support or oppose each of these on its own terms. What you cannot honestly do is pretend the Sanders Khanna 5% wealth tax is a plan with no plan for the proceeds. The uses are spelled out, and they are aimed squarely at the cost pressures that dominate ordinary budgets.

The constitutional objection and its limits

Now the hard part, because I promised to take the critics seriously. The most substantive objection is constitutional. Legal scholar Jonathan Turley and others argue that the 16th Amendment permits taxation of income, not of wealth itself, and that a levy on unrealized holdings sits on shaky ground. This is not a frivolous point. It is the strongest card the opposition holds, and it will be played in court the moment anything like this becomes law.

I do not think the objection is dispositive, but I do think it is genuine. The question of whether Congress can reach static wealth rather than annual income is unsettled at the highest level, and reasonable jurists disagree. Anyone selling this bill as a constitutional slam dunk is overselling. The honest framing is that it would trigger a serious legal test, and that the outcome of that test is not knowable in advance.

What frustrates me is when the constitutional argument is used not to invite that test but to foreclose the debate entirely. "It is unconstitutional" too often functions as a conversation ender rather than a conversation starter. If the country decides that concentrated wealth is a problem worth addressing, then the constitutional pathway becomes a design question, not an automatic veto. Turley may well be right about the current text. That is a reason to litigate carefully, not to stop thinking.

Contested revenue estimates from both camps

The second serious objection is fiscal. Tax Foundation's Jared Walczak has challenged the revenue estimates, and the general critique from the right is that wealth taxes raise far less than sponsors claim once the wealthy adjust their behavior. Assets get restructured, valuations get disputed, residency gets reconsidered, and the projected windfall shrinks. Several European countries tried wealth taxes and later repealed them, and that history is fair to cite.

Here is where I try to hold two thoughts at once. The sponsors' $4.4 trillion figure already assumes a 10% leakage rate, which is more candid than skeptics sometimes acknowledge. But 10% may be optimistic for a group with the resources of the American billionaire class, and if the true avoidance rate runs higher, the checks and the childcare caps get harder to finance. Both the sponsors and their critics are pointing at real dynamics. The difference is a matter of degree, and degree is exactly what a committee markup and a Congressional Budget Office score are supposed to resolve.

That is the point I keep returning to. The revenue dispute is a reason to scrutinize the estimates, not to refuse to produce them. A serious legislative process would stress test the Saez and Zucman modeling against the Walczak critique in public, with numbers on the table. Instead we get dueling press releases. The public deserves the audit, not the theater.

Saez, Zucman, and the wealth velocity argument

There is a deeper economic claim buried in the bill that gets less attention than the checks, and I think it is the most interesting part. Saez and Zucman project that the tax would roughly halve billionaire wealth growth annually. Read that carefully: the goal is not to expropriate fortunes but to slow the rate at which they compound. Against a backdrop of 132% growth over six years, a 5% annual levy is a brake, not a demolition.

This reframes the whole debate. If you believe that the runaway compounding of top end wealth is itself a democratic problem, distorting politics, media, and markets, then slowing that compounding is a feature. If you believe that such compounding is simply the reward for building companies people value, then slowing it is a cost. I lean toward the former, but I want to be clear that this is a values question wearing an economics costume. The modeling tells you what happens to the growth rate. It cannot tell you whether you should care.

What the modeling does clarify is that the doomsday framing on both extremes is overwrought. The billionaires would not be bankrupted, and the fortunes would not disappear. They would grow more slowly while funding a set of middle class programs. Whether that trade is worth making is a legitimate disagreement. Pretending the trade does not exist is not.

A wider progressive tax the rich movement

This bill did not arrive in a vacuum, and understanding the moment helps explain why it matters even if it stalls. The push overlaps with a wider progressive effort to tax high earners and large fortunes. NYC Mayor Zohran Mamdani has proposed a 2% surtax on incomes over $1 million, and Sanders swore Mamdani in and appeared at rallies with him in 2026. The Vermont senator is not just introducing a bill. He is stitching together a movement with a shared premise.

That premise is worth naming plainly: that the tax code has drifted too far toward protecting accumulated capital and too far from asking the most fortunate to underwrite shared obligations. You can reject that premise. Many Americans do. But it is now a durable current in one of the two major coalitions, and durable currents eventually shape law even when individual bills fail. Dismissing the Sanders Khanna 5% wealth tax as a stunt ignores that it is one expression of a broader realignment, not a one off provocation.

The Mamdani connection also signals where the energy is heading, from federal proposals down to city halls and statehouses. When a mayoral candidate in the nation's largest city runs on a millionaire surtax and a sitting senator amplifies it, the tax the rich argument is no longer confined to the ideological fringe. It is contesting for the mainstream, and it is winning enough elections to keep the pressure on.

Steep odds in a Republican controlled Congress

Let me be realistic about the near term. The bill faces steep odds given Republican control of Congress. It is not going to pass this session, and its sponsors surely know that. So a certain kind of critic will say the whole exercise is empty messaging, a way for Sanders to fundraise and Khanna to build a national profile. There is some truth in that read, and I will not pretend otherwise.

But messaging bills are how the American conversation actually moves. Ideas that look impossible circulate for years before a shift in Congress makes them suddenly plausible. The value of introducing the tax now, when it cannot pass, is that it forces the country to rehearse the arguments before the moment when they count. The constitutional test, the revenue math, the values question about compounding wealth: better to litigate all of it in the open now than to scramble later.

My argument, in the end, is not that you must support this bill. It is that you owe it a real hearing. The $8.2 trillion held by 938 people is a fact about our country that will not resolve itself, and a proposal to address it deserves better than a reflexive eye roll. Engage the constitutional objection. Interrogate the revenue estimate. Weigh the values at stake. Then decide. That is what serious citizenship looks like, and it is the least we owe a question this consequential.