How ZeroMargin evaluates structured liquidity

2.1Inputs & Market Data

Our baseline framework uses market-linked inputs and account-level constraints together. The rate side starts with reference points such as SOFR, Treasury yields, SPX option market pricing, and the broker margin schedule we are comparing against. The structure side includes account permissions, margin regime, expected term, desired liquidity amount, and the asset mix supporting the trade.

• Comparisons are only useful if loan size, term, fees, and execution quality are aligned across the alternatives.
• We treat quoted rates, implied rates, and after-tax cost as different layers. A cheaper headline number is not enough by itself.
• Execution assumptions matter. A theoretical mid-price and a filled multi-leg order are not the same thing.

2.2Assumptions & Sizing

Most examples on the site assume a client is trying to raise meaningful liquidity without liquidating a long-term portfolio. We typically model a fixed term, a known funding amount, and a portfolio that remains invested after the trade. That means the key risk variable is not whether cash appears in the account at entry, but how much margin cushion remains after the cash is withdrawn.

• We assume box spreads are used for defined-term liquidity rather than for speculative options exposure.
• We generally prefer SPX because European-style exercise reduces the risk of the structure breaking apart before expiration.
• We treat drawdown tolerance as a first-order constraint. A low-cost structure is still a bad structure if the remaining cushion is too thin for the portfolio's volatility.
• Tax-sensitive examples are illustrations only. Any Section 1256 benefit depends on instrument qualification and whether the investor can actually use the resulting gains or losses.

3.1Benchmarking Rules

We benchmark a box spread against alternatives that solve the same client problem: raising cash against an existing portfolio. The relevant comparison set usually includes broker margin, bank SBLOCs, and in some cases doing nothing or selling assets instead.

• Compare the same dollar amount and term. A floating overnight margin balance is not automatically comparable to a defined-term box spread unless the time horizon is normalized.
• Distinguish rate format from risk format. Fixed-term economics may still sit on top of a portfolio with equity drawdown risk.
• Evaluate structure quality, not just price. Early-assignment risk, liquidity depth, collateral treatment, and operational friction can matter more than a small rate difference.
• For after-tax analysis, separate cash received at entry from the tax character of the funding cost over time.

3.2Limits & Non-Goals

This framework is intentionally conservative about what it claims. It can show when structured funding appears more efficient, but it cannot remove broker infrastructure risk, eliminate drawdowns, or determine whether a client should borrow at all.

• Live execution can differ from site illustrations because option markets, spread widths, and broker policies change.
• A box spread can still coexist with ordinary margin pressure if the underlying portfolio declines after cash is taken out.
• Not every account can access the same strategy set. Options permissions, portfolio margin eligibility, and retirement-account rules can block implementation.
• Tax examples are framing tools, not tax opinions. We do not present Section 1256 as automatic or universal.

4.1Source Stack

The current methodology draft is assembled from the site's own research library, internal comparison tables, and the rate snapshot layer already used elsewhere in the product. Each layer serves a different purpose: editorial explanation, illustrative benchmarking, and current market context.

4.2Review Process

This page is version one. It is meant to replace the placeholder shell with a usable public methodology, not to declare the framework finished. As new articles, live-data plumbing, and legal review mature, the methodology can absorb more explicit formulas, assumptions by use case, and deeper source notes.

• Numerical examples should remain labeled as illustrative unless they are sourced from a live, timestamped data pipeline.
• Any public rate claim should continue to show source, timestamp, and assumptions in the surrounding copy.
• When research articles expand, methodology should link outward rather than duplicating long-form analysis inside one page.