Portfolio loans at institutional rates.
Introducing Box Spread Loans — a sophisticated, tax-efficient borrowing strategy designed for high-net-worth investors who refuse to choose between liquidity and growth.
A More Efficient Way to Borrow
Access institutional pricing typically unavailable to individuals
Box spread lending is an advanced, options-based strategy that functions as a synthetic secured loan — providing access to capital without disrupting your existing portfolio.
Utilized by hedge funds and institutional investors for decades, this approach is now accessible to Bootpack clients with $1M+ taxable portfolios seeking greater control, lower costs, and superior tax efficiency. We’ve partnered with SynthericFi, specialists in structuring and executing box spread loans.
Whether financing real estate, managing tax liabilities, or preserving concentrated positions, box spread lending gives you attractive rates and liquidity on your terms.
Click SyntheticFi link for current rates:
*Disclosure: Rates described are approximate as of April 2026, do not include any additional management or origination fees and are subject to change at any time without notice. Actual rates may vary significantly based on market conditions, borrower qualifications, and other factors, and are not guaranteed. Information presented may be incomplete or inaccurate and should not be relied upon as the sole basis for any financial decision.
Client Use Cases
Finance life's biggest moments without triggering unnecessary taxes or disrupting your portfolio's trajectory.
Debt
Refinancing
Replace high-rate HELOCs, credit cards, or mortgages with a single lower-rate loan.
Real Estate
Bridge Financing
Fund a down payment or pay cash for a new property before selling your current home.
Real Estate
Purchases
Finance a home purchase >$750K mortgage exemption to lower the overall cost of purchase - with a tax benefit.
Home
Renovations
Finance major remodels at rates significantly lower than traditional HELOCs.
Large
Purchases
Often lower than traditional rates for buying vehicles or businesses.
Capital
Calls
Fund private equity or real estate commitments without disturbing public market positions.
Estate
Planning
Borrow long-term and pass the portfolio to heirs with a step-up in basis to manage capital gains.
Advantages of Box Spread Loans
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Lower Borrowing Costs
Typically, SOFR + 20–30 bps. Today 4.0-4.5% depending on duration — far below traditional options.
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No Monthly Payments
Like a zero-coupon bond — interest accrues and is due only at expiration, up to five years out.
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Tax Advantages
Interest paid is treated as a capital loss for tax purposes — a meaningful advantage for taxable accounts.
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Roll or Repay on Your Terms
Pay off entirely at expiration or roll forward into a new position. No forced sale of assets.
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Keep Your Portfolio Intact
Your portfolio keeps compounding. No capital gains triggered, no disruption to your long-term plan.
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OCC-guaranteed
Trades are cleared by the Options Clearing Corporation, minimizing counterparty credit risk.
Disclosure: Benefits described are not guaranteed and may vary. Strategies involve risks, including the use of derivatives and potential tax implications. Treatment of interest and tax outcomes depends on individual circumstances and may change. Consult your financial and tax advisors before implementing any strategy.
Box Spreads vs. Traditional Loans*
| Box Spread Loans | Standard Margin Loans | Mortgages | HELOCs | Personal Loans | |
| Typical Rates | 4%-4.5% | 5-12% | 6.50% | 7% | 12%+ |
| Payment Frequency | At Maturity | Monthly | Monthly | Monthly | Monthly |
| Tax Benefits | Capital Loss | Interest Expense | Mortgage Deduction up to $750K. None thereafter. | Varied | None |
| Duration | 1 Month to 5 Years | Open-ended | 10-30 Years | Revolving | 2-7 Years |
*Disclosure: Rates shown are approximate as of April 2026, do not include any fees and are subject to change at any time without notice. Actual rates may vary significantly based on market conditions, borrower qualifications, and other factors, and are not guaranteed. Information presented may be incomplete or inaccurate and should not be relied upon as the sole basis for any financial decision.
| Loan Type | Typical Rates | Payment | Tax Benefits | Duration |
|---|---|---|---|---|
| Box Spread Loans | ~4% | At Maturity | Capital Loss | 1 Month – 5 Years |
| Standard Margin Loans | 5–12% | Monthly | Interest Expense | Open-ended |
| Mortgages | 6.50% | Monthly | Deduction up to $750K | 10–30 Years |
| HELOCs | 7% | Monthly | Varied | Revolving |
| Personal Loans | 12%+ | Monthly | None | 2–7 Years |
The Loan Process with Bootpack
Set Terms: We work with you to determine the right loan
size, type and duration.
Connect Account: Bootpack links your Charles Schwab account with our strategic partner, SyntheticFi.
Execute Loan: SyntheticFi structures and executes the box spread in the options market.
Receive Proceeds: Cash is transferred directly from your brokerage account to you, no asset sales required.
Repay or Extend: At maturity, you can repay the loan or roll it forward. No interest is due in the interim.
What are the risks?
Margin Call Risk
Similar to traditional portfolio loans, box spread loans are backed by your investment portfolio. The box spread structure itself is designed to produce a fixed outcome and is not dependent on market direction—its value is not impacted by whether markets rise or fall. For example, a significant market move (up or down) does not change the defined outcome of the box spread.
The primary risk comes from the portfolio used as collateral, which will fluctuate in value. If the value of the collateral declines, you may be required to add funds or reduce the loan balance, potentially at an unfavorable time. To help manage this risk, we generally recommend borrowing no more than 25–30% of your portfolio value.
Rate Risk at Renewal
If you roll the loan at expiration, the new rate will reflect prevailing SOFR at that time. Rates could be higher or lower than your original term.
This strategy involves derivatives and is best suited for experienced investors with taxable portfolios.
Disclosure: This material is for informational purposes only and is not investment, tax, or legal advice. The risks listed are not exhaustive; additional risks may apply. All investments involve risk, including potential loss of principal. Strategies involving leverage and derivatives may not be suitable for all investors. Consult your financial, tax, and legal advisors before investing.
Frequently Asked Questions:
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Both, depending on your situation. Floating-rate structures can function like a line of credit—offering the flexibility to draw and repay capital over time without needing to precisely time the loan.
For clients with more defined needs, fixed-rate structures are often more appropriate—particularly when the timing is known or for longer-term uses such as real estate purchases or other planned liquidity events.
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In theory, clients may borrow up to 50% of equities and ETFs, 70% of fixed income holdings, and up to 90% of U.S. Treasuries. For portfolios exceeding $200,000, borrowing capacity on equities and ETFs may increase to as much as 85% under portfolio margin.
In practice, we take a more conservative approach. To reduce the risk of a margin call during periods of market stress, we generally recommend borrowing no more than 25–30% of total portfolio value.
The minimum loan amount is $10,000.
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Box spread loans are structured using SPX index options, which are treated as Section 1256 contracts. This means the borrowing cost is typically realized as a capital loss (not interest), with 60% treated as long-term and 40% as short-term, regardless of holding period.
These positions are also marked-to-market annually, so gains or losses are recognized each year, even though the interest isn’t due until maturity.
This structure can be more tax-efficient than traditional borrowing, but treatment depends on individual circumstances—so we coordinate closely with your CPA.
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SyntheticFi charges a small management fee.
Bootpack does not charge any additional fees for arranging or managing these loans.
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While box spread loans can be executed by experienced options traders, we strongly advise against attempting them without the right expertise and infrastructure. Access through Bootpack requires being a client, as we facilitate these loans via our partnership with Schwab and SyntheticFi, providing the execution, oversight, and risk management needed to do it properly.
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No. Options based strategies are forbidden in retirement accounts. You can only borrow against taxable accounts for box spread loans.
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The onboarding process typically takes about two weeks. The first step is getting your Schwab account approved for options trading. Once approved, we connect your account to SyntheticFi through a managed account agreement, enabling execution and ongoing management of the strategy.
Take Control of Your Liquidity and Tax Strategy.
Box spread lending is a powerful, often overlooked tool for investors who think beyond the conventional. It combines cost-effectiveness, tax efficiency, and portfolio preservation into one elegant strategy — letting you meet today's financial needs without sacrificing tomorrow's growth.
"The most sophisticated investors don't choose between liquidity and growth. Box spread lending gives them both."