In March 2020, the Nifty fell 38% in 40 calendar days. Retail traders who had pledged their long-term holdings — Infosys, HDFC Bank, even Reliance — to write options woke up to something brutal. Not margin calls in the traditional sense. Their brokers had already sold their shares. No SMS warning. No phone call. Just a demat statement that looked nothing like what they remembered.
That is the forced liquidation trap. And it is built directly into how pledging works.
What Pledging Actually Does to Your Portfolio
When you pledge shares, you are telling your broker: "Use these as collateral so I can take positions — F&O, intraday, whatever — without transferring cash."
The broker marks a lien on your demat account through CDSL or NSDL. Your shares stay in your account technically, but they are frozen. You cannot sell them until you unpledge. In exchange, you get margin credit — but not 100% of the share's market value.
SEBI mandates a haircut. Blue-chip stocks like Reliance Industries get around 85% margin against their current price. Midcap names like Trent sit at 50–60%. Small caps can go as low as 25%. The logic is simple: the more volatile the stock, the bigger the haircut, because the collateral needs to cover potential intraday swings.
Here is the part most retail traders miss: SEBI reviews and resets these haircut percentages weekly. A stock that gave you 80% margin on Monday might give you 65% on the following Monday if its volatility spiked. Your usable margin drops overnight without you touching a single position.
The Actual Cost of Pledging at Zerodha and Upstox
Pledging is not free. At Zerodha, you pay ₹30 per scrip plus GST per pledge request. If you pledge and then unpledge — the full round trip — that is ₹60 per scrip plus GST. Do it with five different stocks and you are looking at ₹300+ just in administrative costs before a single trade.
Upstox charges similarly, though the exact fee structure has varied by account type. Always check your broker's current schedule.
This sounds trivial until you account for the mechanics of maintenance margin. If your pledged portfolio falls in value, the margin it generates falls with it. Say you pledged ₹10 lakh worth of Reliance shares and got ₹8.5 lakh in margin credit. If Reliance drops 15%, your collateral is now worth ₹8.5 lakh, and your margin credit drops to roughly ₹7.2 lakh. If your open positions require ₹8 lakh in margin, you are now in a shortfall — even though you never changed your positions.
When Pledging Makes Actual Sense
There is one use case where pledging is genuinely intelligent: option writing with a long-term equity portfolio as backing.
Imagine you hold ₹20 lakh in Nifty 50 stocks with low churn intent — you bought them to hold for 3–5 years. Pledging them lets you write covered calls or cash-secured puts on indices without tying up fresh cash. The margin requirement for writing one lot of Nifty options is roughly ₹1.2–1.5 lakh depending on volatility. You can manage this across a few lots using pledged collateral, collecting monthly premium income of ₹8,000–₹20,000 per lot depending on which strike you write.
The key word is "covered." The strategy only works if the pledged shares are genuinely long-term holdings you would not sell even if the market fell 25%. If you would panic-sell at a 15% drawdown, pledging those same shares to take positions is a structural disaster waiting to happen.
Short-duration option sellers — people running systematic weekly expiry strategies on Bank Nifty or Nifty — use pledging as a capital efficiency tool. Done with discipline and hard stop-losses on the F&O side, it keeps cash free for other uses.
The March 2020 Trap: How Retail Got Liquidated
In late February 2020, the Nifty was at 11,900. By March 23rd, it had hit 7,511 — a fall of nearly 38%. The speed was the killer. In a single week (March 9–13), the index fell over 11%.
Retail traders who had pledged blue chips to write options faced a compounding disaster. Their pledged collateral fell in value — reducing available margin. Simultaneously, their short option positions were bleeding heavily because implied volatility exploded (India VIX went from 14 to 86 within weeks). Both sides of the equation crushed them at the same time.
SEBI's rules at the time — and still today — allow brokers to liquidate pledged holdings if the margin shortfall is not covered by end of day. There is no grace period guaranteed. There is no mandatory phone call. The broker's risk management system can trigger square-off automatically.
Thousands of retail accounts saw their long-term Infosys and TCS holdings sold in March 2020 at the absolute bottom — not because they wanted to sell, but because their F&O positions had eaten through the margin buffer.
How to Read the Haircut Table Before You Pledge
SEBI publishes the approved list of securities for pledge and their applicable haircuts. Your broker typically maintains their own version of this on the platform. Before pledging anything, check three things:
- The current haircut percentage for that specific scrip
- Whether the stock is on the "approved for pledge" list at all (many midcaps and all SME stocks are not)
- How close the resulting margin takes you to your position's requirement — leaving zero buffer is how people get liquidated
A practical rule: never use more than 70% of your pledged margin capacity for live positions. The remaining 30% is your buffer against haircut resets and market moves. If you are using 95% of available pledged margin, you are one bad week away from a forced sale.
After SEBI's circular from August 2020 (effective from September 1, 2020), the pledge-repledge mechanism changed significantly. Brokers can no longer use client securities freely for their own purposes. You now pledge directly from your demat account and the broker repledges to the clearing corporation. This added protection for clients — but the forced liquidation mechanics on margin shortfall remain exactly the same.
What You Should Actually Do Before Pledging Anything
Check the haircut weekly if you are running an active strategy. Your broker's app will show you the current pledged value — refresh this number every Monday.
Keep a cash buffer of at least 20–25% of your margin requirement in your trading account. This cash handles day-to-day MTM losses without forcing haircut calculations to matter.
Unpledge immediately when you close the strategy. There is no point paying ₹30 per scrip to keep shares locked up as collateral if you have no open positions using that margin.
And be honest about one thing: are these shares you would hold through a 30% drawdown regardless? If the answer is no, pledging them to fund leveraged positions creates a situation where a market crash forces you to sell the same shares at the worst possible price — precisely when you should be buying more. That is the trap. The mechanics make it feel like free capital. The risk is that it turns your long-term portfolio into the emergency exit for your short-term bets.