The wealthy use debt to get richer by borrowing against assets they already own instead of selling them, because borrowed money isn’t taxable income. That single tax rule, combined with interest deductions, real estate depreciation, and the reset of cost basis that happens at death, turns loans into one of the most efficient ways to spend and invest without ever writing a check to the IRS on the gains. The average borrower treats debt as something to escape. Wealthy borrowers treat it as a tool, and the question they ask about any loan is whether the borrowed dollar produces more value than it costs.
Loan Proceeds Are Not Taxable Income
Everything else in this article rests on one line of the tax code. Federal law defines gross income as “all income from whatever source derived” and lists fourteen categories, including wages, business profits, rents, dividends, and gains from property sales. Loans don’t appear on that list, because borrowing creates an equal obligation to repay.1Office of the Law Revision Counsel. 26 U.S. Code 61 – Gross Income Defined You have $1 million in hand, but you also owe $1 million, so your net worth hasn’t moved.
Compare two ways of getting cash. Sell $1 million of stock you bought for $200,000, and you owe capital gains tax on the $800,000 profit. Borrow $1 million against that same stock, and you owe nothing, because no sale occurred and no gain was realized. Same cash in your pocket. Wildly different tax bill. Borrowed money only becomes taxable if the debt is later canceled or forgiven for less than you owe, at which point the forgiven amount counts as income.2Internal Revenue Service. Topic No. 431, Canceled Debt – Is It Taxable or Not
Borrowing Against Investments Instead of Selling Them
Wealthy investors often hold millions in appreciated stocks and funds. Liquidating those positions would trigger long-term capital gains tax of 15% or 20%, plus a 3.8% net investment income tax for individuals with modified adjusted gross income above $200,000 filing single or $250,000 filing jointly.3Internal Revenue Service. Topic No. 559, Net Investment Income Tax On a $5 million portfolio with a $1 million cost basis, a full sale can generate a federal tax bill north of $950,000.
A securities-backed line of credit avoids that entirely. The investor pledges the portfolio as collateral and borrows against it, typically drawing 50% to 95% of the account’s value depending on the holdings and the lender.4FINRA. Securities-Backed Lines of Credit Explained The investments stay in the account and keep earning dividends and appreciating. The borrower walks away with liquid cash and no taxable event.
Interest rates on these lines usually track a benchmark like SOFR or prime plus a spread, well below the rate on a personal loan or credit card, because the portfolio itself secures the debt.4FINRA. Securities-Backed Lines of Credit Explained One boundary worth noting: only taxable brokerage accounts can be pledged. Federal law protects 401(k)s, 403(b)s, and IRAs from being used as loan collateral, so the strategy is available only to investors who hold substantial wealth outside their retirement accounts.
The catch is the margin call. If markets drop and the portfolio falls below the lender’s threshold, the borrower has to post more collateral or watch the lender liquidate positions to cover the shortfall. That forced sale is a taxable event. The borrower owes capital gains tax on any appreciation in the liquidated shares, even though they didn’t choose to sell. You can end up paying the very tax bill you were trying to avoid, at the worst possible moment.
How Leverage and Tax Breaks Compound in Real Estate
Real estate is where the math of leverage shows itself most cleanly. Put $200,000 down on a $1 million rental, and you control the whole asset with 20% equity. A 5% appreciation year produces a $50,000 gain, which is a 25% return on the $200,000 actually invested rather than the 5% return an all-cash buyer would see. Tenants pay down the mortgage while the property appreciates, so equity builds from two directions at once.
Depreciation Deductions on a Growing Asset
The IRS lets you deduct the cost of residential rental property over 27.5 years and commercial property over 39 years using the straight-line method.5Internal Revenue Service. Publication 946, How to Depreciate Property On a rental with $800,000 of depreciable value, that’s roughly $29,000 in annual deductions against an asset that may actually be gaining in market value. An owner collecting $60,000 in net rental income might report only $31,000 after depreciation. The tax bill drops on income produced by an asset largely bought with borrowed money.
1031 Exchanges to Defer the Gain
When a property does sell, Section 1031 lets the owner defer the entire capital gain by rolling the proceeds into another qualifying investment property.6Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Real Property Held for Productive Use or Investment The old basis carries over. The timeline is strict: 45 days to identify a replacement in writing, 180 days to close. Miss either deadline and the whole gain becomes taxable. The exchange applies only to real property held for business or investment, not personal residences. Investors who chain 1031 exchanges across a career can defer gains for decades.
Cash-Out Refinancing to Pull Equity Out Tax-Free
As equity builds, investors frequently refinance into a larger mortgage and pocket the difference. Because the proceeds are loan funds rather than a sale, the cash is tax-free. That money funds the next down payment, and the cycle repeats. This is how a portfolio scales from one property to ten without ever saving up another down payment from earned income.
Deducting Interest on Investment and Business Debt
The tax code allows deductions for interest paid on debt used for business or investment purposes, which means the government effectively subsidizes part of the borrowing cost.7Office of the Law Revision Counsel. 26 USC 163 – Interest For someone in the top federal bracket, every deductible dollar of interest saves roughly 37 cents in federal income tax.
The deduction has limits. Investment interest, the kind generated by borrowing to buy stocks or other portfolio assets, can only be deducted up to net investment income for the year, with the excess carried forward.8Internal Revenue Service. Form 4952 – Investment Interest Expense Deduction Business interest is capped at 30% of adjusted taxable income for most businesses above a revenue threshold.7Office of the Law Revision Counsel. 26 USC 163 – Interest
The IRS also requires interest tracing. You have to document that borrowed funds actually went to the investment or business purpose you’re claiming against. Split one loan between a business purchase and a kitchen renovation, and only the business portion qualifies. Sloppy records are where most people lose this deduction.
Buy, Borrow, Die: The Strategy That Ties It All Together
The most aggressive legal use of debt combines the pieces above into a three-step cycle that can wipe out capital gains taxes across a lifetime.
Buy. Acquire assets that appreciate over time: stocks, real estate, a business. Hold them.
Borrow. When cash is needed, borrow against those appreciated assets rather than selling. Loan proceeds are not income, so no tax is due. The cash pays for living expenses, more investments, whatever the owner wants.
Die. On the owner’s death, heirs receive the assets with a stepped-up basis. The cost basis resets to fair market value on the date of death, and every dollar of lifetime appreciation escapes capital gains tax.9Office of the Law Revision Counsel. 26 USC 1014 – Basis of Property Acquired From a Decedent
The estate then uses the inherited assets, now at their stepped-up value, to pay off the outstanding debt. Because the basis was reset, that final sale triggers little or no tax. Debt served as a tax-free bridge that let the owner spend the value of appreciating assets without ever realizing a gain, and the lifetime capital gains bill lands near zero.
Estate tax still applies at death, but debt reduces the taxable estate dollar-for-dollar. The federal exclusion is $15 million per person for 2026, or $30 million for a married couple, following the One, Big, Beautiful Bill Act signed in July 2025.10Internal Revenue Service. Whats New – Estate and Gift Tax Estates above the threshold face a 40% rate, but outstanding loans shrink the taxable amount. Someone dying with $20 million in assets and $5 million in loans has a $15 million taxable estate, potentially right at the exemption line.
Arbitraging the Spread Between Borrowing Costs and Returns
Wealthy borrowers consistently access lower interest rates than average consumers because they bring substantial collateral and strong credit to the table. That opens a simple play: borrow at one rate and invest at a higher one. Borrow $10 million at 4%, and interest runs $400,000 a year. Invest the same $10 million at a 10% return, and gross income is $1 million, leaving $600,000 in profit after debt service. Part of the interest may be deductible on top of that.
Inflation quietly helps. Debt is denominated in fixed dollars, so when prices rise 3% a year, the real cost of the loan shrinks. The borrower repays with dollars that buy less than the ones originally borrowed, while the underlying assets tend to rise with or ahead of inflation. Cash sitting idle loses ground on both sides of that same trade.
The discipline is matching debt maturity to investment liquidity. Borrowing on a five-year term for an investment that locks up capital for ten creates a dangerous gap. Sophisticated borrowers line up the timing of their obligations with the cash flows from their investments, so they’re never forced to liquidate at a bad moment to make a payment.
Where This Goes Wrong
Leverage cuts both ways. The same 5:1 ratio that turns a 5% property gain into a 25% return on equity turns a 10% decline into a 50% loss. Every strategy above carries real downside, and the borrowers who use these tools successfully spend serious time managing that risk.
Recourse Versus Non-Recourse Debt
The loan type dictates what a lender can seize on default. Non-recourse debt limits the lender to the collateral itself; if a borrower stops paying a non-recourse mortgage, the bank takes the property but can’t touch the borrower’s other assets. Recourse debt lets the lender go after personal assets, garnish wages, and levy other accounts.11Internal Revenue Service. Recourse vs Nonrecourse Debt Which category a loan falls into depends on loan type and state law, and negotiating non-recourse terms is a significant part of how wealthy borrowers protect themselves.
Cross-Collateralization
Some private banking relationships pledge one asset as security for multiple loans. Convenient in good times. Dangerous otherwise. A default on any single loan can trigger defaults across every loan tied to the same collateral, so an investor who pledged a real estate portfolio for both a business line of credit and a personal securities loan could lose the property and the investment account from a single missed obligation. Cross-default clauses buried in loan agreements deserve close reading before signing.
Forced Liquidation and the Tax Bill That Comes With It
A downturn that triggers a margin call can force sales at exactly the wrong time, and those sales still count as taxable dispositions. The borrower can owe capital gains tax on appreciated securities that were sold involuntarily, writing a check to the IRS in the same month their net worth dropped by millions. This is the main reason disciplined borrowers never draw close to their credit limit and keep a buffer between the outstanding balance and the lender’s collateral threshold.
None of these strategies are risk-free. They work in favorable markets and turn dangerous in downturns, which is why they’re usually paired with diversification, conservative loan-to-value ratios, and enough liquid reserves to ride out a sustained decline without a forced sale.