# Defined payoff risk is not margin

**OPT-F03 · Core Options · Beginner**

**Lesson question:** Which cash number measures funding and which measures loss?

Original fictional examples; educational writing, not live market data, orders or production approval.

## By the end

- Explain the mechanism in the lesson question.
- Reproduce the worked comparison and recognize its failure case.

**Prerequisites:** OPT-F01

Premium, margin, notional and terminal maximum loss answer different questions. A credit received is not the amount at risk. A margin requirement is not a contractual loss ceiling. Leverage makes this distinction essential.

Label the number before comparing it with an account balance.

## Understand the mechanism

A five-point vertical receiving 1.00 credit has a four-point terminal loss under simultaneous settlement, or 400 with a 100 multiplier. It receives only 100 at entry. An uncovered call can have unbounded loss even though its broker margin is finite.

The path matters. A stop is an instruction, not a price guarantee. Early assignment can create shares; a broker can require funds or liquidate under its agreement. A terminal curve neither models every operational event nor excuses ignoring it.

## Walk through the process

Choose a fictional or personally appropriate risk budget separately from the instrument. Divide by a relevant loss estimate and round down. Add costs and correlated exposures. Do not size from a premium credit merely because it is cash arriving in the account.

No classroom percentage is universally suitable. The point is consistent arithmetic and an honest description of what the assumed cap does and does not cover.

## A worked example

A fictional 900 risk budget can accommodate two spreads with 400 terminal loss each before costs, exposing 800. Three expose 1,200. Sizing from the 100 credit would incorrectly allow nine spreads and 3,600 terminal risk.

A different broker buying-power number does not change that payoff calculation. Conversely, the 400 terminal bound does not eliminate assignment-related funding needs or bad fills.

## Graph: Defined payoff risk is not margin—worked comparison

**Horizontal:** Illustrative observation  
**Vertical:** Example value

Fictional data from the written example. The chart organizes the comparison; its shape is not a forecast.

Complete numerical data are embedded in `scripts/options-strategies/OPT-F03.js` and displayed as an accessible table in the HTML lesson.

## What would invalidate the reading?

Using the credit as the risk denominator turns an apparently small position into several times the intended exposure. Assuming the original margin deposit is the most that can be lost is another dangerous error.

## Check your understanding

### How many 400-risk spreads fit a 900 budget before costs?

**Answer:** Two.

**Why:** Round down and reserve additional capacity for costs and operational risks.

### What is the critical failure to avoid?

**Answer:** Using the credit as the risk denominator turns an apparently small position into several times the intended exposure. Assuming the original margin deposit is the most that can be lost is another dangerous error.

**Why:** Explain this risk before treating the example as a decision rule. A correct calculation does not guarantee a favorable market outcome. **Critical risk check.**

## Takeaway

Return to the question: Which cash number measures funding and which measures loss? State the observed facts, the assumptions and the failure condition separately.

## References and provenance

The cited references support definitions and conventions. The teaching prose, tickets and numerical scenarios are original; they are not attributed as historical market observations.

- [OCC Equity Options specifications](https://www.theocc.com/clearance-and-settlement/clearing/equity-options-product-specifications)

- [OCC Options Disclosure Document](https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document)