What is step-up in basis?

When someone dies, the assets their heirs inherit are re-valued to the market price on the date of death. The built-in gain that accumulated during the owner's life is wiped out for income-tax purposes, so heirs can sell with little or no capital gains tax.

Can regular people use Buy, Borrow, Die?

Partly. Most people should not borrow to fund their lifestyle — that is leverage and it carries real risk. But the underlying principles apply: hold appreciating assets long term instead of selling, avoid realizing gains you do not need to, use tax-free accounts like Roth, and let heirs benefit from stepped-up basis.

Buy, Borrow, Die: The Billionaire Cheat Sheet

Q: Is Buy, Borrow, Die legal?

Yes. Every step uses existing rules: you are not taxed on assets that rise in value until you sell, loans are not taxable income, and inherited assets receive a stepped-up cost basis. It is legal tax avoidance, not evasion. Critics argue the rules should change, but using them as written is not illegal.

Every so often a story breaks that a billionaire paid a lower tax rate than their assistant. It's not a glitch and it's usually not a crime — it's a three-word strategy with a memorable name: Buy, Borrow, Die. Here's exactly how it works, why it's legal, where it can blow up, and the scaled-down version that actually applies to you.

Is this legal? Yes.

Every step uses the rules as written: you aren't taxed on assets until you sell, loans aren't income, and inherited assets get a "stepped-up" cost basis. That's tax avoidance — legal and reported — not evasion. Plenty of people think the rules should change; that's a different argument from whether using them is legal today. It is.

Three steps, one loophole: gains are only taxed when realized, and death resets the clock.

Step 1 — Buy: own things that go up

The wealthy hold their money as appreciating assets — company stock, private businesses, real estate — not cash in a checking account. This matters because of one rule that runs through the entire tax code: you're taxed on gains only when you "realize" them by selling. A stock that goes from $1M to $50M while you hold it generates a $49M gain that is completely untaxed until the day you sell. On paper you're vastly richer; to the IRS, nothing has happened.

Step 2 — Borrow: spend without selling

So how do you fund a life — houses, jets, everything — without selling and triggering that tax? You borrow against the assets. Banks happily lend against big portfolios and property (securities-backed lines of credit, margin loans, portfolio loans) at low interest rates, because the collateral is right there. And here's the key: a loan is not income, so it isn't taxed.

The math is almost rude. If your assets grow ~8% a year and the loan costs ~5%, you can borrow to live, watch your net worth keep climbing, and never trigger a taxable sale. You spend millions in cash that the tax code simply never sees.

Step 3 — Die: the loophole that erases everything

This is the part that turns a clever cash-flow trick into a generational tax escape. When you die, the assets your heirs inherit get a "step-up in basis" — their cost basis resets to the market value on the date of death. That entire lifetime gain, the $49M that was never taxed, is wiped out for income-tax purposes. Your heirs can sell immediately and owe little or no capital gains tax. The outstanding loans get paid off from the estate, and the appreciated assets pass on having never been hit with income tax. Buy. Borrow. Die.

"But isn't there an estate tax?"

Yes — separate from income tax, large estates can face it. But the 2026 federal exemption is $15 million per person ($30M per couple), and estate planners use trusts (GRATs, dynasty trusts) to shrink or defer what's left. Step-up in basis is a different benefit that applies regardless. The two stack: income tax dodged via step-up, estate tax minimized via exemption and trusts.

Who actually does this? Reported examples

This isn't hypothetical. In 2021, ProPublica published an analysis of leaked IRS data on the wealthiest Americans. Measured against how much their fortunes grew, the 25 richest paid what ProPublica called a "true tax rate" of about 3.4% from 2014–2018 — a metric that compares tax paid to wealth gained, not the conventional taxable-income rate. By that measure:

Warren Buffett — about 0.1%. He holds Berkshire stock and almost never sells.
Jeff Bezos — about 0.98%, and reportedly paid $0 federal income tax in 2007 and 2011.
Elon Musk — about 3.27%, and reportedly paid $0 in 2018.
Michael Bloomberg — among those reported to have owed nothing in several recent years.

The borrow step is documented too. Forbes identified at least 32 of the Forbes 400 pledging stock as collateral for lines of credit. Elon Musk has pledged roughly a third of his Tesla shares and tapped a $12.5 billion margin loan toward buying Twitter in 2022; Larry Ellison has pledged hundreds of millions of Oracle shares against personal borrowing, per SEC filings.

And the die / estate step has its own paper trail: the modern "zeroed-out" GRAT — a trust that passes appreciation to heirs nearly gift-tax-free — took off after a 2000 U.S. Tax Court ruling involving the Walton family of Walmart, and such trusts have since been estimated to cost the Treasury $100 billion+ over two decades.

Important framing

ProPublica and the reporters above stressed the same thing we do: as far as the record shows, these strategies are legal. The debate they sparked is about whether the rules should change — not about anyone breaking them. Naming who uses a legal structure isn't an accusation; it's how the structure works, in the open.

The honest part: it's leverage, and leverage bites

The viral version says billionaires "pay zero taxes forever, risk-free." Not quite. Buy, Borrow, Die is built on debt, and debt has teeth:

Margin calls. If the assets you borrowed against crash, the lender can demand repayment or force a sale — at the worst possible time, triggering the very tax you were avoiding.
Rising rates. Cheap loans get expensive. When borrowing costs climb above your assets' growth, the whole model inverts.
It needs scale. The low rates and giant credit lines are for people with enormous, liquid collateral. It's a strategy for the already-rich, not a way to get rich.

The scaled-down version you can actually use

You're probably not taking out an eight-figure line of credit against a stock portfolio. But the principles underneath Buy, Borrow, Die are just good tax sense, and they scale down:

Don't realize gains you don't have to. Selling appreciated investments to "rebalance" or chase the next thing triggers tax. Holding long-term is a legitimate, powerful default.
Borrow against, don't sell — carefully. A HELOC against your home, instead of selling investments, can avoid a taxable event for a large one-off need. This is leverage; treat it with respect.
Use tax-free buckets. A Roth grows and comes out completely tax-free — your personal version of "never taxed again."
Let step-up work for your family. Assets you hold until death pass to your heirs with their gains erased. Sometimes not selling Grandma's stock is the entire estate plan.

The one-line takeaway

Realized income is taxed; borrowing isn't; death resets the basis. You don't need a billion dollars to respect that order of operations — you just need to stop needlessly triggering tax on things you'd rather keep holding.

Buy, Borrow, Die is the headline act, but it's one move in a bigger playbook. For the rest — S-corps, depreciation, trusts, and what genuinely applies to a one-person business — see the full guide: How the Rich Avoid Taxes (Legally).

FAQ

Is Buy, Borrow, Die legal?

Yes — it uses existing rules (no tax on unrealized gains, loans aren't income, step-up basis at death). It's avoidance, not evasion. Whether the rules should exist is a policy debate, not a legal one.

How do billionaires pay so little income tax?

Their wealth is unrealized gains they never sell, and they fund spending with loans, which aren't taxable. Little "income" in the tax sense is ever created.

Can regular people use it?

The borrowing-to-live part is risky and scale-dependent, so most people shouldn't. The principles — hold long-term, don't over-realize gains, use Roth accounts, benefit from step-up — absolutely apply.

Sources

General education, not tax, legal, or investment advice. Borrowing against assets carries real risk of loss. Figures are 2026 U.S. federal rules and change; state taxes differ. Talk to a licensed CPA or advisor before acting.