Loans against securities (LAS)

Here is a proposition that sounds almost too sensible to refuse. You own shares. You need money — for a purchase, an opportunity, an emergency — but you do not want to sell, because selling means giving up future gains and possibly paying tax. So a bank or an NBFC offers a tidy alternative: keep the shares, borrow cash against them at a rate lower than a personal loan, and repay when it suits you. Your portfolio stays intact and your need is met. Why would anyone sell?

This is a loan against securities, usually shortened to LAS, and for a genuine short-term need it can be a reasonable tool. But it carries a flaw that is invisible on the day you borrow and decisive on the day the market falls: the thing securing your loan is the very thing whose value can collapse. When it does, two blows land together — the collateral shrinks and the loan is called in — and this double-whammy is the whole reason LAS ruins people who thought they had taken a safe, cheap loan.

This module is short because the mechanism is simple. But the simplicity is exactly what makes it easy to walk into. Understand one ratio, and you understand the entire trap.

LAS exists because it solves a real problem cleanly. Selling shares to raise cash has two costs an investor feels sharply: you lose the future returns of whatever you sold, and you may trigger capital-gains tax on the way out. If the need for cash is temporary, selling to meet it can be an expensive mistake — you crystallise a tax bill and step out of the market to cover a bill you could have bridged.

A loan against securities offers a bridge. Because the loan is secured — the lender can sell your shares if you do not repay — the interest rate is lower than an unsecured personal loan, and the paperwork is light. You pledge approved shares or mutual funds, the lender advances a fraction of their value, you use the cash, and you repay with interest, getting your unencumbered shares back at the end. For a short, defined need — a few months, a known repayment — it can be genuinely sensible.

The trouble begins when LAS stops being a bridge for a real need and becomes a source of leverage for more investing. The same low rate that makes it a good bridge makes it a tempting way to borrow-and-buy: raise cash against your portfolio and put it back into the market. At that point you are no longer using a loan to avoid a forced sale — you are using it to gear up, and the cheapness of the rate is quietly financing a bet whose risk has nothing to do with the interest.

One ratio runs the whole product: loan-to-value, or LTV — the loan amount as a percentage of the collateral's current market value. If you pledge ₹10,00,000 of shares and borrow ₹5,00,000, your LTV is 50%. Lenders set a maximum LTV (for shares, regulation and prudence keep it around 50%) and, crucially, they monitor it continuously against live prices.

Now hold two facts side by side, because their collision is the entire risk. The loan is fixed. The collateral is not. You borrowed ₹5,00,000 and you owe ₹5,00,000 whatever happens — the debt does not shrink when the market does. But the shares securing it rise and fall every day. So when the market drops, the numerator of the ratio stays put while the denominator falls, and the LTV climbs on its own, with you doing nothing at all.

illustrative Say the market falls 30%. Your ₹10,00,000 of collateral is now worth ₹7,00,000. Your loan is still ₹5,00,000. Your LTV has jumped from 50% to about 71% — straight through the lender's limit — even though you have not borrowed a single extra rupee. The lender now issues a margin call: a demand to restore the ratio, by adding cash or fresh collateral, or by selling shares to pay down the loan. If you cannot add cash — and in a sharp fall, cash is exactly what everyone is short of — the lender sells your shares to bring the LTV back down. It sells them into the fall, near the lows, locking in the loss.

That is the double-whammy in one picture. The fall hurts you once as an ordinary investor — your shares are worth less. LAS makes it hurt twice: the same fall drives your LTV through the limit and forces a sale at the bottom, converting a paper loss you could have waited out into a realised loss you had no choice about. The loan did not just cost you interest. It removed your ability to sit still.

Follow one borrower. illustrative

Arjun owns ₹10,00,000 of shares. He wants ₹5,00,000 — say to fund a deposit — and rather than sell (and pay tax, and lose the upside) he takes an LAS at 50% LTV, ₹5,00,000, at around 11% a year. It feels obviously smart: the rate is far below a personal loan, his portfolio stays invested, and he plans to repay in a year. On the day he signs, nothing about it looks risky.

For eight months it is fine. Then a broad market fall takes his portfolio down 30%. His collateral is now ₹7,00,000; his loan is still ₹5,00,000; his LTV has climbed to about 71%, well past the lender's 50% line. The lender issues a margin call: bring the LTV back to 50% within a short window — which means either repaying about ₹1,50,000 in cash or posting more shares.

Arjun does not have ₹1,50,000 spare; that is why he borrowed in the first place. And his other shares have fallen too, so posting more collateral means pledging even more into a falling market. He cannot meet the call. The lender sells his shares — at the lows, in the worst week — to pull the loan back within limit. He ends up having sold exactly what he borrowed to avoid selling, at exactly the price he most wanted to avoid, and he still owes interest on the months the loan ran. The market recovers four months later. Arjun is not there for it.

The number that sells an LAS is the interest rate, and it is the number that tells you least about the danger.

The rate answers one question: what does the borrowed money cost per year? It says nothing about the question that decides your fate: what happens to the collateral while you hold the loan? A 9% rate on shares that can fall 40% is far more dangerous than a 14% rate on stable collateral, because the risk of ruin in LAS lives entirely in the volatility of the security, not in the coupon. Reading LAS by its rate is like judging a bridge by its toll and ignoring how much weight it holds.

The rate also cannot tell you the most important thing about timing: margin calls and market falls arrive together, which means the demand for cash comes precisely when cash is hardest to raise. This is not bad luck; it is structural. The mechanism that triggers the call — a fall in the collateral — is the same event that has drained everyone's liquidity and knocked down the assets you would sell to raise cash. The large falls that trigger these calls are more common than a calm model expects, and they cluster: the worst days arrive in the worst weeks, when your other assets are down and lenders across the market are calling loans at once.

And the sharpest edge of all: borrowing against shares to buy more shares. Here the collateral, the loan and the new purchase are the same bet. A fall loses on the purchase, shrinks the collateral, and breaches the LTV all at once — the double-whammy squared. It feels like conviction. It is a way to be forced out of a position permanently for being early rather than wrong. Cheap leverage stacked on a single view is how a survivable drawdown becomes a terminal one.

LAS fools careful people because everything about it looks conservative on the day you sign.

1. Judging the loan by its rate. The low rate is real and reassuring, and it measures the wrong thing. Risk lives in the collateral's volatility and the LTV, not the interest. A cheap loan on a fragile structure is a fragile loan.

2. Assuming you can meet a margin call in cash. People model the call as "I'll just add money." But you borrowed because you needed money, and the call arrives in a fall, when cash is scarce and your other assets are down too. The plan to meet it usually evaporates exactly when it is needed.

3. Forgetting the loan doesn't shrink. The collateral moves; the debt does not. It is easy to watch the portfolio and forget the fixed ₹5,00,000 sitting behind it, quietly raising the LTV every time the market ticks down.

4. Treating a comfortable LTV as permanent headroom. Starting at 50% against a 50% limit feels safe. But that is zero headroom for a fall — the very first drop pushes you over. Real safety needs the loan to be a small fraction of stable collateral, not a large fraction of volatile collateral.

5. Borrowing against shares to buy more shares. The most seductive and the most dangerous — it feels like backing your best idea with leverage. It removes every cushion at once and turns a single view into a forced-sale machine. Size so that a bad fall costs you money, never your ability to stay in the game.