What Is Portfolio Margin? Definition & Example

Why It Matters

Portfolio margin can reduce your margin requirements by 50-75% for hedged positions, allowing you to deploy the same strategies with significantly less capital. Requires $100K+ minimum and approval.

How It Works

Uses a risk-based model (typically OCC's TIMS) that evaluates the portfolio's theoretical loss across 10+ stress scenarios. Hedged positions get credit for offsetting risks. The result: iron condors require fraction of Reg-T margin.

Example

SPY iron condor: Reg T margin = $500 per spread (max loss). Portfolio margin = ~$200 per spread (risk-based, accounting for the hedged structure). On 50 iron condors: Reg T = $25,000, PM = $10,000. PM frees up $15,000.

Common Mistakes

Maxing out PM buying power. PM requirements can double overnight during a vol spike. If you use 90% of PM buying power, a VIX jump from 18 to 25 could trigger a margin call. Keep 40%+ of PM buying power free.

Related Terms

DTE (Days to Expiration)

Enter at 30–45 DTE for optimal theta/gamma balance. Close or roll at 21 DTE or 50% profit — whichever comes first.

Assignment

Not a disaster — it's the plan in the wheel strategy. If you only sell puts on stocks you'd own, assignment is just the next step.

Roll (Rolling)

Roll for a net credit or don't roll at all. Rolling for a debit just delays a loss. Best done before the position goes deep ITM.

Annualized Return

Looks impressive but is misleading if you ignore losses. Track actual account returns, not annualized returns on winners only.

Breakeven

Always know your breakeven before entering. If the stock can realistically reach it, either widen the margin or skip the trade.

Bid-Ask Spread

Wide bid-ask = hidden cost on every trade. Stick to liquid underlyings where the spread is under 5% of the option price.

Frequently Asked Questions