Asset-backed loans (ABL), including securities-based lines of credit (SBLOCs), margin loans, and pledged asset lines (PAL), allow you to pledge brokerage assets (e.g., stocks, ETFs, bonds, cash) as collateral to obtain credit. SBLOCs and PALs are typically non-purpose loans — lenders prohibit using proceeds to purchase or carry securities — whereas margin loans are purpose credit used to buy or carry securities and are subject to initial and maintenance margin requirements under Federal Reserve Regulation T ( 12 CFR §220 Credit by Brokers and Dealers), with banks and lenders also governed by Regulation U ( 12 CFR §221, Credit by Banks and Persons other than Brokers or Dealers for the Purpose of Purchasing or Carrying Margin Stock).
These facilities can provide liquidity without selling appreciated positions (potentially deferring realization of capital gains), but they involve collateral and rate risks: declines in asset values can trigger collateral calls and forced liquidation; rates generally float off SOFR or prime plus a spread; and interest, if deductible, is treated as investment interest and limited to net investment income under IRC §163(d), “Interest”. Table 16.1 “Advantages and disadvantages of Asset Backed Loans” provides detailed analysis.
Your collateral must exceed the value of your loans by a certain minimum,
where is at least 1 and the Buffer is non-negative. For instance, if you’re limited to borrowing up to of your collateral’s value, then equals 1.5. Should your collateral’s value dip below this threshold, the brokerage has the right to sell off your collateral to bring your loan into compliance with these requirements. This forced sale, known as a “margin call”, often occurs at the least opportune time—when your securities have lost value, making it the worst time to sell. Be aware that these sales can occur at any time, potentially conflicting with any trading restrictions or Exchange-traded Product (ETP) rules you might be subject to.
The numbers behind the threshold. For a true margin account the regulatory floors are fixed: Regulation T sets initial margin at 50% (you may borrow at most half the value of marginable securities at purchase), and FINRA sets the maintenance minimum at 25% equity. Brokerages layer stricter “house” requirements on top — commonly 30%–35% for diversified equity, and far higher (50% or more, occasionally 100%) for concentrated single-name or volatile positions. SBLOCs and PALs are not bound by Reg T and instead publish their own advance rates: typically 50%–70% of value on diversified equities, more on Treasuries and investment-grade bonds, and steep haircuts or outright ineligibility on concentrated or low-priced stock.
The maintenance requirement is what sets your margin-call price. With a 30% house maintenance requirement, a call triggers when
Borrow $100,000 against a $200,000 portfolio and the call fires when the account falls to — a 29% drop erases your cushion. Halve the loan to $50,000 and the call price drops to roughly $71,400, giving you a 64% drawdown of room. Size the draw against the decline you can survive, not the maximum the broker will advance.