SEBI 50:50 Cash Margin Rule: What F&O Traders Must Do

SEBI's 50:50 Margin Rule Is Now Live And It Changes Everything for F&O SEBI's 50:50 cash margin rule is no longer a proposal on paper. It's in force. As of full implementation, every F&O trader in India must maintain at least 50% of their total margin requirement in cash or cash-equivalent instruments (liquid mutual funds, T-bills, bank FDs) rather than pledged equity shares. The remaining 50% can still be non-cash collateral, but the days of funding an entire derivatives book on pledged stock are over. The immediate practical effect is straightforward: traders who were running large F&O positions backed entirely by equity pledges now need to inject real liquidity into their accounts. For a retail trader carrying ₹10 lakh in margin obligations, at least ₹5 lakh must now sit in cash-equivalent form. That's capital that can't simultaneously be deployed elsewhere in stocks, IPOs, or as a personal liquidity buffer. The friction is real and the adjustment period is short. This isn't a sudden policy shock. SEBI has been signaling this structural tightening for over two years, concerned that concentrated pledge-based collateral creates systemic risk, particularly when markets correct sharply and pledged stocks fall in value precisely when brokers need that collateral to hold firm. The 2020-21 period, when several brokers collapsed partly due to collateral mismanagement, remains the regulatory backdrop here. How Discount Brokers and Wealth Platforms Take the Hit The clearest earnings impact falls on listed broking and financial services companies. [Angel One](/stock/ANGELONE) (NSE: ANGELONE) derives a significant portion of its revenue from F&O trading activity — the segment accounted for roughly 55-60% of its order flow in recent quarters. If retail F&O participation shrinks, or if traders reduce position sizes to meet the new cash floor, Angel One's revenue per active client could compress. The stock has already seen pressure over the past six months as F&O volume gr...