Investing usually involves taking your saved cash and buying stocks or funds. You transfer the money, pick your shares, and wait for them to grow. But there is another method experienced traders use to amplify their potential returns.
It involves using the assets you already own as collateral to borrow more money from your broker. This strategy can magnify your wins, but it also increases your risk.
Buying Power
Your account dashboard will display a number labeled as buying power. This figure often looks much larger than the actual cash you deposited. When you investigate what is margin lending and how it functions, you will find that this number represents the total amount of stock you can buy including the loan.
It is essentially your cash plus the money the broker is willing to lend you. It is easy to feel wealthier than you actually are when looking at that inflated number. However, you must remember that you have to pay back the loan portion regardless of how your stocks perform.
Platforms such as SoFi aim to give investors tools to manage their portfolios, but the responsibility of handling leverage always falls on the user. You get to keep the profits on the total amount invested, but you also bear the full brunt of any losses on that total value.
A Sudden Cash Request
The biggest risk in this strategy comes when the value of your portfolio drops. Brokers require you to maintain a certain level of equity in your account. This is known as the maintenance requirement. If your stocks fall in price, the percentage of the portfolio that you actually own shrinks.
When your equity drops below the required minimum, the broker issues a margin call. This is a demand for you to deposit more cash or securities into your account immediately. You have to bring your equity back up to the minimum level. It can happen very quickly in volatile markets, forcing you to find cash when you least expect it.
Your Broker’s Right to Sell Your Stocks
If you cannot deposit new funds during a margin call, the broker will not wait for you. They have the right to sell your securities to cover the shortfall. They do not need to ask for your permission before making these sales.
The broker can choose which assets to sell to get the money back. They might sell the stocks you wanted to keep the most. They will sell them at the current market price, which is likely low since the market is dropping. You lose control over your portfolio decisions in this scenario.
How a Falling Market Can Trigger a Debt Spiral
Leverage works both ways. It multiplies gains when stocks go up, but it also multiplies losses when they go down. If you buy stock with 50% cash and 50% borrowed money, a small drop in the stock price results in a much larger drop in your personal equity.
This can lead to a situation where you lose more money than you originally invested. If the stock price crashes significantly, the sale of the stock might not cover the full loan amount. You would then owe the broker the remaining balance. It turns a bad investment into a financial liability that extends beyond your initial deposit.
How a Margin Loan Is Calculated: A Worked Example
The key number is the loan-to-value ratio, or LVR. Suppose you have $10,000 of your own money and your broker allows a 70% LVR on a particular share. That means you can borrow up to $7,000 against it — but the usual setup is the other way round: you buy $10,000 of shares with $3,000 of your own money and $7,000 borrowed, because the loan is 70% of the total value. If the shares rise 10%, your $10,000 holding becomes $11,000, and after repaying the $7,000 loan you hold $4,000 — a 33% gain on your $3,000. But if the shares fall 10%, your holding is $9,000, you still owe $7,000, and your equity is $2,000 — a 33% loss. The same leverage that doubles your upside doubles your downside, and that is the whole story of margin lending in one example.
The Real Costs of Borrowing to Invest
Interest is the obvious cost, and it is charged daily on the amount you borrow, so a loan held for months costs far more than one held for days. Rates are usually variable, which means they can rise while you hold the loan. Then there are the less obvious costs: brokerage on larger trades, possible account fees, and the tax treatment of interest, which varies by country and is not always deductible. There is also an opportunity cost — money lost in a margin call is gone, and the forced sale often happens at the worst moment, locking in the loss. Before borrowing, write down the total cost for three scenarios: the investment flat, up 10%, and down 10%. If the down scenario wipes out more than you can afford to lose, the loan is too big, whatever the upside looks like.
Who Should Avoid Margin Lending
Margin lending is a poor fit for most beginners. If you are investing money you will need within a year, do not borrow against it. If a 20% fall would force you to sell other assets or miss bills, do not borrow. If you do not fully understand LVRs, margin calls, and forced sales, do not borrow until you do. Retirees living on their investments should be especially careful, because a forced sale can permanently shrink the capital that produces their income. Margin lending suits only investors with steady spare income, a long time horizon, a diversified portfolio, and enough cash buffer to meet a margin call without selling. If that description does not fit you, the safer way to grow is simply to invest more of your own money over time.
Safer Alternatives to a Margin Loan
If you want more exposure without a margin loan, there are simpler options. The first is just to invest regularly: the same amount every month buys more shares when prices fall and fewer when they rise, which smooths your average cost. The second is to use a diversified fund instead of single shares, so one bad result cannot sink your portfolio. The third is to save toward a larger lump sum before investing, rather than borrowing to reach it now. None of these is as exciting as leverage, but none of them can trigger a margin call either. Leverage is a tool for amplifying results, not for creating them — and for most people, patience amplifies results more reliably than debt does.
Frequently Asked Questions
How much can I borrow with margin lending? It depends on the LVR your broker sets for each investment, commonly 50% to 80% for large shares and lower for risky ones. Your borrowing limit rises and falls with the value of your holdings.
What happens if I cannot meet a margin call? Your broker can sell your investments without asking you, usually starting with the most liquid ones, until the loan is back within its limit — often at a loss to you.
Is the interest on a margin loan tax deductible? In many countries yes, when the loan is used to buy income-producing investments, but rules vary and change, so check your local tax rules or ask an adviser before assuming anything.
Can I lose more than I invested with margin lending? Yes, in a sharp fall your equity can be wiped out and you can still owe money, because the loan does not shrink when the investment does.
