Options accounts & routing
How do Options Maintenance Margin Requirements differ from standard equity Regulation T margin rules?
By Easy Money Scanner · Educational reference · Not investment advice
The short answer
Options maintenance margin uses strategy-based formulas tied to each specific options position (e.g., percentage of underlying value minus out-of-money amount), while Regulation T governs only the initial margin for new securities purchases, not ongoing options risk-based requirements.
How it works
FINRA Rule 4210 and exchange rules set specific margin formulas for uncovered calls, puts, and spreads based on underlying value and moneyness, recalculated daily, unlike Reg T's simpler 50% initial purchase requirement.
An example
An uncovered call might require margin equal to 20% of the underlying value plus the option premium, minus any out-of-the-money amount, per FINRA's standard formula.
Risk & limitations
Margin requirements can increase sharply during volatile markets as underlying value and premium rise, potentially triggering margin calls even without a position change.
Examples are hypothetical, not trade recommendations. US contract and regulatory references do not automatically apply in Canada. Rules, margin requirements and broker policies can change; confirm them with the relevant authority and your broker.