You can borrow against stocks you hold in a taxable brokerage account, and federal rules let you take an initial loan of up to 50% of the pledged portfolio’s market value for most equity securities.1Federal Reserve Board. Federal Reserve Board Legal Interpretation on Regulation T Using stocks as collateral for a loan is called securities-based lending. You keep ownership of the shares, you avoid selling them and triggering capital gains, and you get cash at rates well below unsecured credit. In exchange, you accept a real risk: if your portfolio drops far enough, the lender can sell your holdings to pay itself back, and it doesn’t have to warn you first.
The Two Kinds of Loans You Can Get
Securities-based borrowing comes in two forms, and the one you’re offered determines what you can spend the money on.
A margin loan lives inside your brokerage account. It’s governed by the Federal Reserve’s Regulation T, and the borrowed money is meant for buying more securities.1Federal Reserve Board. Federal Reserve Board Legal Interpretation on Regulation T When you buy stock “on margin,” you’re pledging your existing holdings and borrowing the rest from the broker.
A securities-based line of credit, often called an SBLOC or a pledged asset loan, is a revolving credit line you can draw on for almost anything except buying more securities.2FINRA. Securities-Backed Lines of Credit Explained People use SBLOCs for real estate purchases, business funding, bridge financing, and personal expenses. The credit line runs under a separate loan agreement, though the lender still places a lien on your pledged shares.
In both cases, the securities stay in your name and stay in your account. The lien blocks you from selling or transferring them until the loan is repaid, and if you default, the lender can seize and sell the collateral without going to court.
What You Can and Cannot Pledge
Lenders generally accept stocks, bonds, mutual funds, ETFs, and Treasury securities held in a cash or margin account. The portfolio has to be liquid enough that the lender could unload it quickly if things go wrong. That requirement rules several categories out.
Restricted stock is the most common exclusion. Shares carrying a Rule 144 legend can’t be freely sold on the open market without meeting holding periods and other conditions, which defeats the point.3Securities and Exchange Commission. Rule 144 – Selling Restricted and Control Securities Options, warrants, and illiquid alternative investments are also excluded.
Retirement accounts are off-limits for a different reason. The IRS treats pledging an IRA as security for a loan as a prohibited transaction. Under IRC Section 408(e)(4), the pledged portion is treated as a distribution.4Office of the Law Revision Counsel. 26 US Code 408 – Individual Retirement Accounts It becomes taxable income, and if you’re under 59½, you also owe a 10% early withdrawal penalty. A similar prohibited transaction rule applies to 401(k) plans.5Internal Revenue Service. Retirement Topics – Prohibited Transactions Securities-based lending is limited to taxable, non-retirement brokerage accounts.
How Much You Can Actually Borrow
Two things set your borrowing limit: the loan-to-value ceiling under Regulation T, and the individual “haircut” the lender applies to each holding.
Regulation T caps the initial loan at 50% of market value for equity securities that trade actively on major exchanges.6eCFR. 12 CFR 220.12 – Supplement: Margin Requirements A $1 million portfolio has a $500,000 absolute maximum, but most borrowers land below that because the lender discounts risky holdings.
A haircut reduces the collateral value assigned to a security. Diversified large-cap stocks get a small haircut. A concentrated position in a volatile stock, or a thinly traded micro-cap, gets a much larger one. A lender might recognize only 20% of a micro-cap’s market value as usable collateral, dropping the borrowing power on those shares well below what Regulation T would otherwise allow.
Concentration rules matter too. When a single stock exceeds roughly 10% of your pledged portfolio, lenders often apply a stricter LTV to the amount above that threshold. Government bonds and high-grade corporate bonds usually get more favorable treatment than equities because their prices move less.
What It Costs
Securities-based loans carry variable interest rates that float with a benchmark, usually the Secured Overnight Financing Rate (SOFR) plus a spread that shrinks as the credit line gets larger. Because the loan is fully collateralized, the rates run well below unsecured personal loans or credit cards.
The variable rate is itself a risk. The SEC and FINRA have specifically flagged that the rate “may change every day,” and borrowers tend to underestimate what happens if short-term rates spike.7Investor.gov. Investor Alert – Securities-Backed Lines of Credit Most SBLOCs have no setup fees and no annual fees, which is part of the appeal, but the absence of upfront costs makes it easy to treat the line as free money and stop tracking the compounding interest.
What Happens If Your Portfolio Drops
This is the risk to understand before you sign anything. If the pledged securities lose enough value, the lender issues a maintenance call: you have to deposit cash, pledge more securities, or pay down the balance to restore the account’s equity cushion.
Two thresholds are in play. Regulation T’s 50% initial requirement controls how much you can borrow up front. After that, FINRA Rule 4210 sets a minimum maintenance margin of 25% of the current market value of the pledged securities.8FINRA. FINRA Rule 4210 – Margin Requirements Most firms impose a “house” requirement higher than that floor, commonly 30% to 40%, so they have a buffer.
When your equity drops below the house requirement, you’ll typically receive a maintenance call and are usually given two or three days to meet it.7Investor.gov. Investor Alert – Securities-Backed Lines of Credit The lender is not required to give you any notice at all. FINRA is explicit that firms can sell securities in your account to meet a margin call without contacting you first, without letting you pick which holdings get sold, and without waiting for any grace period.9FINRA. Know What Triggers a Margin Call In a fast market, the lender may liquidate enough to pay off the entire loan, not just enough to cure the call.
That’s the nightmare scenario. The market drops, your collateral loses value, the lender sells at depressed prices, and you’re locked into realized losses you never planned to take. If the sale doesn’t cover the outstanding balance plus interest, you still owe the difference. The lien on your securities does not cap your liability at the collateral’s value.
Tax Treatment
Loan proceeds are not taxable income. You’ve borrowed money you have to pay back, so there’s no net gain to tax. That’s the core advantage over selling appreciated stock: you get liquidity without recognizing any capital gains.
Whether You Can Deduct the Interest
Whether the interest is deductible depends entirely on what you spend the money on. Federal tax law makes you trace the actual use of the proceeds, and the collateral securing the loan is irrelevant to the analysis.10GovInfo. 26 CFR 1.163-8T – Allocation of Interest Expense Among Expenditures
If you use the proceeds to buy investments, the interest is investment interest expense, deductible up to your net investment income for the year.11Office of the Law Revision Counsel. 26 US Code 163 – Interest You report it on IRS Form 4952, and any excess carries forward indefinitely.12Internal Revenue Service. About Form 4952, Investment Interest Expense Deduction
If you use the proceeds for personal expenses like a car, tuition, or a vacation, the interest is personal interest and is not deductible at all.11Office of the Law Revision Counsel. 26 US Code 163 – Interest If you split the proceeds, allocate the interest proportionally. Keep records; the documentation burden is on the taxpayer.
When a Forced Sale Creates a Tax Bill
If the lender sells your securities to satisfy a margin call, the sale is a taxable event even though you didn’t initiate it. You recognize the capital gain or loss based on the difference between the sale price and your original cost basis. Because the lender picks the shares and the timing, you can’t manage the outcome through tax-loss harvesting or lot selection. This is where the tax advantage can reverse: a forced sale during a downturn can still produce a taxable gain if you originally bought the shares well below the current (but falling) market price.
Other Risks Before You Sign
The margin call gets most of the attention, but a few other features of these loans tend to surprise borrowers.
- SBLOCs are demand loans. The lender can call the entire balance due at any time, for any reason, not just when your collateral drops. If you’ve used the line to fund a real estate purchase and the lender demands repayment, you may end up selling the pledged securities anyway, undoing the tax benefit you were trying to preserve.7Investor.gov. Investor Alert – Securities-Backed Lines of Credit
- The lender can decide a security no longer counts as eligible collateral. If that happens, your credit limit drops and you may face an immediate call to post more assets or repay part of the balance.7Investor.gov. Investor Alert – Securities-Backed Lines of Credit
- Moving your brokerage account to another firm while securities are pledged is difficult. You generally have to repay the loan in full first, which regulators describe as a “sticky” feature that locks you into your current firm.7Investor.gov. Investor Alert – Securities-Backed Lines of Credit
- A falling market cuts your collateral value and your net worth at the same time, exactly when you’re least able to come up with extra cash. Borrowers who use high LTV ratios leave themselves almost no room to absorb a downturn.
Using stocks as collateral works best when you keep the balance well below the maximum you’re allowed to borrow and hold enough liquid assets outside the pledged account to meet a maintenance call without a fire sale. If you’d struggle to come up with cash on two days’ notice during a market decline, the strategy is more fragile than the low interest rate makes it look.