Short options
What happens to my buying power requirement when market volatility expands globally?
By Easy Money Scanner · Educational reference · Not investment advice
The short answer
When market-wide volatility rises, buying power requirements for short options positions typically increase because brokers raise margin estimates to reflect higher potential price swings, which can reduce available capital for new trades or trigger margin calls on existing ones.
How it works
This effect can occur broadly across a portfolio during market stress, even on positions that have not directly moved against the trader, since margin models often use current implied volatility inputs.
An example
During a sharp market selloff, a trader's existing short put positions may show increased margin requirements even if the specific stock has only moved modestly, due to broader volatility spikes.
Risk & limitations
OCC and broker risk disclosures note margin requirements can change without notice and traders may be forced to deposit additional funds or close positions quickly.
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.