Securities-Backed Lines of Credit: The Wealthy Investor's Loan, Explained
A securities-backed line of credit lets you borrow against your portfolio for almost anything except buying more stock. Here's how an SBLOC works, how it differs from margin, what triggers a collateral call, and who it actually suits.
When people describe how the rich live off borrowed money in the buy, borrow, die strategy, the loan they’re usually talking about is a securities-backed line of credit, or SBLOC. It sits between the two loans covered in the last posts: like a margin loan, it’s backed by your investments; like a HELOC, it’s a line of credit you draw on for spending.
What an SBLOC is
An SBLOC is a revolving line of credit, usually from a bank affiliated with your brokerage, that uses the stocks, bonds and funds in a pledged investment account as collateral. Your investments stay invested. You keep collecting dividends and any growth, and you draw cash when you need it.
The key rule: an SBLOC is a non-purpose loan. You can’t use the money to buy or carry more securities. You can use it for nearly anything else: a home purchase, a tax bill, a business, tuition, or a bridge loan while you wait for another property to sell.
How it differs from margin
| Margin loan | SBLOC | |
|---|---|---|
| Can buy more stock with it | Yes | No |
| Typical minimum | $2,000 | Often $100,000 or more in assets |
| Rates | Often high for small balances | Usually lower, especially for large lines |
| Repayment | None scheduled | Usually monthly interest payments |
| Collateral risk | Margin calls | Collateral calls (the same idea) |
Because SBLOCs are aimed at larger accounts, their rates are often much lower than retail margin rates. They’re typically variable, set as a benchmark like SOFR plus a spread that shrinks as the line gets bigger.
How much you can borrow
The lender assigns an advance rate to each type of asset. Typical ranges look like this:
- Diversified stocks and stock funds: roughly 50% to 70% of value
- Investment-grade bonds: often 70% to 90%
- Treasuries and cash equivalents: up to about 95%
- Single concentrated stocks, small caps and volatile holdings: lower, or not accepted at all
Retirement accounts like IRAs and 401(k)s can’t be pledged.
A worked example
Say you have a $1 million diversified stock portfolio. The lender offers a 60% advance rate, so your line is $600,000. To keep it simple, assume the lender issues a collateral call if your loan grows to more than 70% of the portfolio’s value. (Real terms vary by lender.)
- You borrow $400,000. A collateral call comes if the portfolio falls below about $571,000, a drop of about 43%.
- You borrow the full $600,000. The call comes at about $857,000, a drop of only about 14%. That’s an ordinary market correction.
The lesson is the same as with margin: the closer you borrow to the maximum, the smaller the drop it takes to get a call.
The risks
- Collateral calls. If the portfolio falls too far, you have to add cash or securities, or pay down the loan, often within days. If you don’t, the lender can sell your investments, usually without asking which ones.
- Selling triggers taxes. A forced sale of appreciated stock creates the capital gains bill the SBLOC was supposed to help you avoid.
- Variable rates. Rising rates raise the cost of the whole balance. Many borrowers saw that in 2022 and 2023.
- The lender can change the terms. It can lower advance rates or reduce your line, especially in a falling market.
- Advisor incentives. Some brokerage firms pay advisors or earn revenue on SBLOC balances. FINRA has warned investors to make sure a recommended SBLOC actually fits their needs rather than the firm’s.
The tax angle
Borrowed money isn’t income, so drawing on an SBLOC isn’t taxed. Whether the interest is deductible depends on what you spend the money on: generally, interest is deductible for business use or for taxable investments other than securities bought with the loan, and not deductible for personal spending like a vacation or living costs. These tracing rules get technical, so check with a tax professional.
Who an SBLOC suits
An SBLOC makes the most sense for people with a large taxable portfolio who need cash for a while and don’t want to sell appreciated assets. A bridge loan during a home purchase, a large tax payment, or a short-term business need are common uses. Borrowing a small fraction of your line, with a plan to pay it back, keeps the collateral risk low.
It fits poorly for funding a lifestyle indefinitely unless you have a very large portfolio and can absorb a deep downturn. That’s exactly what buy, borrow, die requires.
The short version
An SBLOC lets you borrow against your investment portfolio for almost anything except buying more securities, usually at lower rates than margin. Your investments stay invested, and you avoid selling appreciated assets. But the rate is variable, the lender can call for more collateral when markets drop, and a forced sale brings back the tax bill. Borrow well below the limit, and know how far your portfolio can fall before a collateral call.
Not investment or tax advice — just an explanation of how securities-backed lines of credit work. Talk to a financial professional about your own situation.