A pledged asset mortgage lets you borrow against a home purchase using your investment portfolio as collateral instead of making a traditional cash down payment. You keep owning the securities and collecting their dividends, but the lender locks them in a restricted account for the life of the loan. The appeal is avoiding a taxable sale of appreciated investments; the catch is that a market drop can force the lender to sell those investments anyway, at the worst possible moment.
How It Works
A conventional down payment reduces the lender’s risk by giving you immediate equity in the property. A pledged asset mortgage gets to the same place through a different route: eligible securities move into a restricted brokerage account the lender controls, and that account sits alongside the property as a second layer of collateral. With two sources of security, the lender can reduce or eliminate the cash down payment requirement.
You still own the pledged investments. Dividends, interest, and price appreciation all stay yours. What you give up is access. You cannot trade, withdraw, or move the pledged assets without the lender’s permission, and the account stays locked until the mortgage is paid off.
What You Can Pledge
Lenders accept highly liquid, marketable securities: Treasury bonds, investment-grade corporate bonds, publicly traded stocks, and shares in widely held mutual funds or ETFs. Illiquid holdings are almost always excluded, including private equity, concentrated positions in a single stock, limited partnerships, and alternative investments. The lender wants collateral it can sell quickly in a stressed market.
Accepted assets are not credited at full market value. Lenders apply a discount, commonly called a haircut, to account for the risk that values could drop before the collateral is liquidated. Treasury bonds get smaller haircuts; equities get larger ones that reflect their wider price swings. Two borrowers pledging accounts of identical dollar size will get different collateral credits if their holdings differ.
The lender then sets a loan-to-collateral ratio that must be maintained throughout the loan. The collateral value, after haircuts, must stay above a specified percentage of the outstanding loan balance. A diversified portfolio makes that ratio easier to hold. A portfolio heavy in volatile growth stocks faces tighter requirements and a greater chance of a margin call.
What Happens to Your Account
Once you commit, the securities move into a restricted, non-discretionary account. The legal mechanism that locks it down is typically a three-party control agreement signed by you, the lender, and the brokerage firm holding the assets. The agreement gives the lender legal authority over the account under specific conditions, primarily a margin call or default, while leaving ownership and income rights with you.1U.S. Securities and Exchange Commission. Pledged Collateral Account Control Agreement
Under the Uniform Commercial Code, the lender perfects its security interest by obtaining “control” of the account, meaning the brokerage firm agrees to follow the lender’s instructions regardless of what you request once certain triggers are hit. The lender also files a UCC-1 financing statement as public notice to other creditors that the securities are encumbered.2U.S. Securities and Exchange Commission. Securities Account Sole Control Agreement
You can watch the account, collect its income, and see it grow, but you cannot touch the principal. If you want to rebalance, sell a position, or withdraw funds, you need explicit lender approval. Some lenders allow limited substitutions, swapping one eligible security for another of equal or greater value, but this is negotiated case by case rather than built into the standard terms.
What the Rate Looks Like
Pledged asset mortgages almost always carry adjustable rates rather than fixed ones. The benchmark is the Secured Overnight Financing Rate (SOFR), which replaced LIBOR as the standard reference index for adjustable-rate lending.3Federal Reserve Board. Final Rule Implementing Adjustable Interest Rate (LIBOR) Act Your rate is SOFR plus a fixed spread, and the size of that spread depends on the loan amount, the value of the pledged collateral, and how much business you do with the institution overall.
Relationship pricing drives much of this market. A borrower who keeps $5 million in managed accounts at the same bank will get a tighter spread than someone who pledges $500,000 and has no other relationship with the firm. The lender is partly subsidizing the mortgage rate to retain a profitable wealth management client. Rate adjustments happen monthly, quarterly, or annually depending on the loan terms, and every adjustment flows directly to your payment.
The variable rate matters more here than in an ordinary adjustable-rate mortgage because the risks compound. If rates climb, your monthly payment increases at the same time a market selloff could be eroding your collateral. Stress-test both directions together: what happens to your cash flow and your collateral cushion if rates rise two percentage points while your portfolio drops 20%?
The Margin Call Risk
This is where pledged asset mortgages get dangerous in practice. If your portfolio drops enough that the loan-to-collateral ratio breaches the maintenance threshold, the lender issues a demand for additional cash or eligible securities to shore up the restricted account. The mechanic is functionally identical to a brokerage margin call.
Morgan Stanley’s disclosures for its pledged asset program are blunt about what follows. If you fail to deposit additional collateral, the lender can sell your pledged securities without prior notice and without letting you choose which positions get liquidated.4Morgan Stanley. How to Help a Loved One Buy a Home The lender sells whatever it needs to restore the ratio, regardless of whether that locks in a loss on your most appreciated holdings or triggers a concentrated tax hit.
Morgan Stanley also reserves the right to increase collateral maintenance requirements at any time without notice and to call the entire loan at any time for any reason.4Morgan Stanley. How to Help a Loved One Buy a Home Other lenders carry similar provisions. These are not hypothetical clauses buried in fine print. They define the fundamental risk of the product.
The most effective defense is holding collateral well above the minimum from day one. If the lender requires a 50% loan-to-collateral ratio, pledging 150% of the minimum gives you a substantial buffer before any call triggers. Keeping a separate cash reserve earmarked specifically for potential margin calls also prevents being forced into a bottom-of-the-market sale.
Tax Consequences
A Forced Sale Is Still a Sale
When the lender sells pledged securities to restore the collateral ratio, the sale triggers capital gains tax exactly as if you had sold them yourself. If you pledged stock purchased years ago at a low cost basis, the tax bill on a forced sale can be substantial. Long-term capital gains are taxed at 0%, 15%, or 20% depending on your income, with the 20% rate applying above $545,500 of taxable income for single filers and $613,700 for joint filers in 2026.5Internal Revenue Service. Topic No. 409, Capital Gains and Losses Net investment income tax adds another 3.8% for high earners, and borrowers using these mortgages typically land in that bracket.
The irony is hard to miss. The entire point of a pledged asset mortgage is to avoid selling appreciated investments, yet the margin call mechanism can force exactly that sale under the worst conditions: during a market decline, at depressed prices, with no control over which lots get sold.
The Mortgage Interest Deduction
Interest paid on a pledged asset mortgage may qualify for the mortgage interest deduction if the loan is secured by your primary or secondary residence and was used to acquire, build, or substantially improve that home. For loans taken out after December 15, 2017, you can deduct interest on up to $750,000 of mortgage debt ($375,000 if married filing separately).6Office of the Law Revision Counsel. 26 USC 163 – Interest
Because these mortgages are commonly used for high-value properties with jumbo loan amounts, many borrowers will have balances above the $750,000 cap. Interest on the portion above that limit is not deductible. Talk to a tax advisor about how the structure interacts with your return, especially if the loan terms or collateral arrangement differ from a standard acquisition mortgage.
Pledged Asset Mortgage vs. Securities-Backed Line of Credit
Anyone researching this product will run into securities-backed lines of credit (SBLOCs), and the two are easy to confuse because both use your portfolio as collateral. The differences matter.
A pledged asset mortgage is a traditional mortgage with the securities replacing or supplementing the cash down payment. The loan has a set term and amortization schedule, the property is the primary collateral, and the securities are supplementary. An SBLOC is a revolving credit line with no fixed repayment schedule and no connection to any specific property. You can use SBLOC funds for almost anything, including a home purchase, but the loan is not a mortgage and the home is not collateral.
The distinction has real consequences. Mortgage interest is potentially deductible; SBLOC interest generally is not unless you can trace the borrowed funds to a deductible purpose like investment expenses. An SBLOC also carries a demand feature, meaning the lender can call the full balance at any time, not just when collateral drops below a threshold. Some borrowers use an SBLOC as a bridge to fund a down payment and then refinance into a conventional mortgage, which adds complexity and a second set of closing costs but avoids the long-term collateral lockup.
How to Apply
The underwriting runs on two parallel tracks. The traditional side works like any mortgage: income verification, credit review, employment history, and a property appraisal. The collateral side is where things diverge. The lender’s portfolio management team evaluates your brokerage holdings for diversification, liquidity, historical volatility, and eligibility under the program’s asset guidelines.
Beyond a standard loan application, you’ll need to provide recent brokerage statements showing account history and cost basis for each position. The key legal documents include the control agreement, executed by you, the lender, and the brokerage firm, and a pledged asset agreement that specifies the collateral maintenance requirements, margin call procedures, and the lender’s liquidation rights. These are separate from the mortgage note and deed of trust.1U.S. Securities and Exchange Commission. Pledged Collateral Account Control Agreement
Before closing, the assets must transfer into the restricted collateral account, the control agreement must be fully executed, and the lender files its UCC-1 financing statement. The loan will not close until the filing is confirmed and the account balance satisfies the initial loan-to-collateral ratio. Expect the process to take longer than a conventional mortgage. The additional legal documentation and collateral evaluation add time, and coordination between the lender, the brokerage firm, and your advisors creates bottlenecks.
Where to Get One
These mortgages are a niche product offered primarily through private banks and wealth management divisions of major financial institutions. Morgan Stanley Private Bank offers a pledged asset feature through its brokerage arm, allowing clients to pledge eligible securities in lieu of a full or partial cash down payment.4Morgan Stanley. How to Help a Loved One Buy a Home Availability varies by state, and not every advisor will be familiar with the mechanics.
Confirm exactly what you’re being offered. Some institutions market pledged asset lines of credit rather than mortgages, and those have different structures, tax treatment, and risk profiles.7Charles Schwab. Pledged Asset Line Frequently Asked Questions You will not find pledged asset mortgages on a rate comparison website next to 30-year fixed mortgages. They are relationship products. You typically need an existing brokerage account with the institution, and the terms you receive depend heavily on how much of your financial life you’re willing to consolidate there.
Getting Your Collateral Back
Your securities remain locked in the restricted account until the mortgage is fully paid off. Once the debt is satisfied, whether through regular payments, a lump-sum payoff, or a refinance with another lender, the lender releases its security interest and the control agreement terminates. At that point you regain full trading and withdrawal rights.
Some borrowers assume they can negotiate a partial release as the loan balance drops and property equity builds, similar to the way PMI drops off a conventional loan. In practice, partial collateral releases are uncommon and entirely at the lender’s discretion. The collateral supports the full loan structure, not just the gap between the property value and the outstanding balance. If partial release matters to you, negotiate it explicitly before closing. Anything not written into the pledged asset agreement does not exist.
If you refinance with a different lender, the original lender must release its UCC-1 filing and terminate the control agreement as part of the payoff. That adds a step that can slow refinancing, so build in extra time if you plan to exit the arrangement before the loan matures.