Multi-Layer Capital Stacks

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Real companies are rarely financed with a single class of capital. Instead, they build a stack of layers of debt and equity, each with its own priority, risk level, and required return. Understanding how these layers fit together is essential to understanding how value flows through a waterfall.

The Two Broad Categories of Capital

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A company’s Total Invested Capital, also referred to as Business Enterprise Value when cash is removed or normalized, divides into two broad categories. Debt capital sits senior and is repaid first. Equity capital sits subordinate and participates in whatever value remains. Within each category, there is a spectrum of classes ranging from the most secure and lowest-returning at the top to the most subordinate and highest-returning at the bottom.

The Full Capital Spectrum
From least risk to most risk, the capital stack includes the following layers:

Asset Lending: Senior secured debt backed by specific assets. The most secure position with the lowest required return.

Cash Flow Debt: Unsecured debt repaid from the company’s cash flow rather than asset collateral.

Mezzanine Debt: Debt with equity upside, often including warrants. It sits between senior debt and equity in priority and carries a higher return to compensate for the subordinate position.

SAFE: A Simple Agreement for Future Equity. It offers optionality, converting to equity at a future round, and sits senior to equity in a liquidation.

Preferred Equity: Equity with a preference. Preferred equity holds priority over common and carries negotiated rights around dividends, conversion, and participation.

Common Equity: The level of equity typically traded on public exchanges and the standard benchmark for incentives. Common equity participates only after all senior claims are satisfied.

Options: Any equity instrument contingent upon other instruments, such as warrants or profits interests. The most subordinate and highest-risk position in the stack.

How the Layers Interact

Each layer of the stack must be satisfied in order of priority before the next layer receives any value. Senior secured debt is repaid first, followed by unsecured and cash flow debt, then mezzanine, then SAFEs and convertible notes as they convert or are repaid, then preferred equity by round seniority, and finally common equity and options. The more layers in the stack, the more breakpoints exist in the waterfall, and the more complex the allocation of value becomes.

Structures Are Getting More Complicated

Real deals rarely resemble a clean stack. Multiple rounds of preferred, several convertible notes and SAFEs with different caps and discounts, option pools, and side letters all add layers and interactions. Each instrument creates new breakpoints and new participation rules. This complexity is precisely why a rigorous, forward-looking method like the Discounted Future Proceeds

Method is necessary; simpler models cannot accurately allocate value across a truly multi-layered capital structure.

Why This Matters for the DFPM

Every layer in the capital stack carries its own risk and therefore its own required return. The Discounted Future Proceeds Method assigns each layer a discount rate that reflects its position in the stack, from approximately 12% for senior debt to 23.5% or more for options. By modeling each layer separately and discounting its expected proceeds at the appropriate rate, the DFPM connects the full capital structure back to the underlying business enterprise value.