How do brokers make money from margin accounts?
They will make money from brokerage as usual and also from the interest they charge you for lending you the money for you to buy your shares on margin. In other words you will be paying interest on the $30,000 you borrowed from your broker. Also, as per Chris's comment, if you are shorting securities through your margin account, your broker would charge you a fee for lending you the securities to short. "Your broker will charge you commissions and debit interest on your ""overdraft"" of $30,000. However it is very likely that your contract with the broker also contains a rehypothecation clause which allows your broker to use your assets. Typically, with a debt of $30,000, they would probably be entitled to use $45-60,000 of your stocks. In short, that means that they would be allowed to ""borrow"" the stocks you just bought from your account and either lend them to other clients or pledge them as collateral with a bank and receive interest. In both cases they will make money with your stocks. See for example clause #14 of this typical broker's client agreement. Applied to your example: In other words they will make $60 + $450 + $1,800 = $2,310 the first year. If the stock is expensive to borrow and they manage to lend it, they will make a lot more. There are by the way a few important consequences:"
At this point the cost of borrowing money is very low.  For the sake of argument, say it is 1% per year for a large institution. I can either go out and find a client to invest 100,000$ and split profit and loss with them. Or, I could borrow 50,000$, pay 500$/year in interest, and get the same return and loss, while moving the market half as much (which would let me double my position!) In both cases the company is responsible for covering all fixed costs, like paying for traders, trades, office space, branding, management, regulatory compliance, etc. For your system to work, the cost to gather clients and interact with them has to be significantly less than 1% of the capital they provide you per year. At the 50% level, that might actually be worth it for the company in question.  Except at the 50% level you'd have really horrible returns even when the market went up.  So suppose a more reasonable level is the client keeps 75% of the returns (which compares to existing companies which offer larger investors an 80% cut on profits, but no coverage on losses). Now the cost to gather and interact with clients has to be lower than 2500$ per million dollars provided to beat out a simple loan arrangement.  A single sales employee with 100% overhead (office, all marketing, support, benefits) earning 40,000$/year has to bring in 32 million dollar-years worth of investment every year to break even. Cash is cheap.  Investment houses sell cash management, and charge for it.  They don't sell shared investment risk (at least not to retail investors), because it would take a lot of cash for it to be worth their bother. More explicitly, for this to be viable, they'd basically have to constantly arrange large hedges against the market going down to cover any losses.  That is the kind of thing that some margin loans may require.  That would all by itself lower their profits significantly, and they would be exposed to counter-party risk on top of that. It is much harder to come up with a pile of cash when the markets go down significantly.  If you are large enough to be worthwhile, finding a safe counterparty may be nearly impossible. A CFD broker will let you open a trade on margin as long as your account balance is more than the margin required on all your open trades. If the required margin increases within a certain percentage of your account balance, you will get a margin call. If you then don't deposit more funds or close losing trades out, the broker will close all your trades. Note: Your account balance is the remaining funds you have left to open new trades with. I always use stop loss orders with all my open trades, and because of this my broker reduces the amount of margin required on each trade. This allows me to have more open trades at the one time without increasing my funds. Effects of a Losing Trade on Margin Say I have an account balance of $2,000 and open a long trade in a share CFD of 1,000 CFDs with a share price of $10 and margin of 10%. The face value of the shares would be $10,000, but my initial margin would be $1,000 (10% of $10,000).  If I don't place a stop loss and the price falls to $9, I would have lost $1,000 and my remaining margin would now be $900 (10% of $9,000). So I would have $100 balance remaining in my account. I would probably receive a margin call to deposit more funds in or close out my trade. If I don't respond the broker will close out my position before my balance gets to $0. If instead I placed a stop loss at say $9.50, my initial margin might be reduced to $500. As the price drops to $9.60 I would have lost $400 and my remaining margin would now only be $100, with my account balance at $1,500. When the price drops to $9.50 I will get stopped out, my trade will be closed and I would have lost $500, with my account balance still at $1,500. Effects of a Winning Trade on Margin Say I have the same account balance as before and open the same trade but this time the price moves up. If I don't place a stop loss and the price goes up to $11, I would have made a $1,000 profit and my remaining margin will now be $1,100 (10% of $11,000). So my account balance would now be $2,000 + $1,000 - $1,100 = $1,900. If I had placed a stop loss at say $9.50 again and the price moves up to $10.50, I would have made a profit of $500 and my margin would now be $1,000. My account balance would be $2,000 + $500 - $1,000 = $1,500. However, if after the price went up to $10.50 I also moved my stop loss up to $10, then I would have $500 profit and only $500 margin. So my balance in this case would be $2,000 + $500 - $500 = $2,000. So by using stop losses as part of your risk management you can reduce the margin used from your balance which will allow you to open more trades without any extra funds deposited into your account. "Probably the most significant difference is the Damocles Sword hanging over your head, the Margin Call. In a nutshell, the lender (your broker) is going to require you to have a certain amount of assets in your account relative to your outstanding loan balance. The minimum ratio of liquid funds in the account to the loan is regulated in the US at 50% for the initial margin and 25% for maintenance margins. So here's where it gets sticky. If this ratio gets on the wrong side of the limits, the broker will force you to either add more assets/cash to your account t or immediately liquidate some of your holdings to remedy the situation. Assuming you don't have any/enough cash to fix the problem it can effectively force you to sell while your investments are in the tank and lock in a big loss. In fact, most margin agreements give the brokerage the right to sell your investments without your express consent in these situations. In this situation you might not even have the chance to pick which stock they sell. Source: Investopedia article, ""The Dreaded Margin Call"" Here's an example from the article: Let's say you   purchase $20,000 worth of securities   by borrowing $10,000 from your   brokerage and paying $10,000 yourself.   If the market value of the securities   drops to $15,000, the equity in your   account falls to $5,000 ($15,000 -   $10,000 = $5,000). Assuming a   maintenance requirement of 25%, you   must have $3,750 in equity in your   account (25% of $15,000 = $3,750).   Thus, you're fine in this situation as   the $5,000 worth of equity in your   account is greater than the   maintenance margin of $3,750. But   let's assume the maintenance   requirement of your brokerage is 40%   instead of 25%. In this case, your   equity of $5,000 is less than the   maintenance margin of $6,000 (40% of   $15,000 = $6,000). As a result, the   brokerage may issue you a margin call. Read more: http://www.investopedia.com/university/margin/margin2.asp#ixzz1RUitwcYg" There are several ways that the issuers profit from CFDs. If the broker has trades on both sides (buy and sell) they can net the volumes off against each other and profit off the spread whilst using the posted margins to cover p&l from both sides. Because settlement for most securities is not on the same day that the order is placed they can also buy the security with no intention of taking delivery and simply sell it off at the end of day to pass delivery on to someone else. Here again they profit from the spread and that their volumes give them really low commissions so their costs are much lower than the value of the spread. If they have to do this rather than netting the position out the spreads will be wider.  Sometimes that may be forced to buy the security outright but that is rare and the spreads will be even wider so that they can make a decent profit. First, a margin account is required to trade options.  If you buy a put, you have the right to deliver 100 shares at a fixed price, 50 can be yours, 50, you'll buy at the market. If you sell a put, you are obligated to buy the shares if put to you. All options are for 100 shares, I am unaware of any partial contract for fewer shares.  Not sure what you mean by leveraging the position, can you spell it out more clearly? To calculate any daily return, all one need do is divide the final value by the initial value, subtract 1, and multiply by 100%: This can be applied to either the futures alone, the investments used as margin collateral alone, or all together. Margin collateral as a factor of a derivative's return Collateral can take many forms. Many suggest that cost and revenue for a derivative trade should also take into account margin requirements.  This can become problematic. If a futures position moved against the trader, yet the margin was secured with equities at the maximum, and the equities moved with the trader, the futures trade could be interpreted as less of a loss because the collateral, which is probably totally disassociated with the futures position, increased in value. Then again, if a futures position moved with the trader, yet the margin collateral moved against the trader then taken together, the futures trade would look less profitable. Furthermore, most likely the result of a futures position and its collateral would never produce the same result, so extrapolation would become ever more difficult. For ease of analysis, a position's cost and revenue should be segmented from another unless if those positions are meant to hedge each other.  Margin is not a cost, but it is a liability, so margin will affect the balance sheet of a futures trade but not its income statement, again unless if the collateral is also used to hedge such futures position. Assuming a USA taxable account: Withdrawing funds from a brokerage account has nothing to do with taxes. Taxes are owed on the profit when you sell a stock, no matter what you do with the funds. Taxes are owed on any dividends the stock produces, no matter what you do with the dividend. The brokerage sends you a form 1099 each year that shows the amounts of dividends and profits. You have to figure out the taxes from that. The Margin Account holds the funds that are MUST for any margin trades. Any funds excess of the MUST for margin trades are kept in the SMA account. These funds can be used for further Margin trades in new securities [funds get transfered into the Margin Account]. They cannot be used to met the Shortfall due to margin calls on existing trades. New funds need to be arranged. More at http://en.wikipedia.org/wiki/Special_memorandum_account "All discount brokers offer a commission structure that is based on the average kind of order that their target audience will make. Different brokers advertise to different target audiences. They could all have a lot lower commissions than they do. The maximum commission price for the order ticket is set at $99 by the industry securities regulators. When discount brokers came along and started offering $2 - $9.99 trades, it was simply because these new companies could be competitive in a place where incumbents were overcharging. The same exists with Robinhood. The market landscape and costs have changed over the last decade with regulation NMS, and other brokerage firms never needed to update drastically because they could continue making a lot on commissions with nobody questioning it. The conclusion being that other brokers can also charge a lot less, despite their other overhead costs. Robinhood, like other brokerage firms (and anyone else trading directly with the exchanges), are paid by the exchanges for adding liquidity. Not only are many trades placed with no commission for the broker, they actually earn money for placing the trade. If Robinhood was doing you any favors, they would be paying you. But nobody questions free commissions so they don't. Robinhood, like other brokerage firms, sells your trading data to the highest bidder. This is called ""payment for order flow"", these subscribers see your order on the internet in route to the exhange, and before your order gets to the exchange, the subscriber sends a different order to the exchange so they either get filled before you do (analogous to front running, but different enough to not be illegal) or they alter the price of the thing you wanted to buy or sell so that you have to get a worse price. These subscribers have faster computers and faster internet access than other market participants, so are able to do this so quickly. They are also burning a lot of venture capital like all startups. You shouldn't place too much faith in the idea they are making [enough] money. They also have plans to earn interest off of balances in a variety of ways and offer more options at a price (like margin accounts)." "Margin trades let you post a margin of a certain proportion of the value of the trade as collateral against the price of a trade and pay off the difference between the current price and the price that you bought at. Any losses incurred are taken from the margin so the margin has to be maintained as prices change. In practice this means that when the price moves significantly from the buying price a ""margin call"" is triggered and the buyer has to increase their posted margin. The vast majority of the foreign exchange trades done every day are margin trades as (effectively) are all spread bets. Margins get reset overnight whether or not a call has occurred." "Lending of shares happens in the background. Those who have lent them out are not aware that they have been lent out, nor when they are returned. The borrowers have to pay any dividends to the lenders and in the end the borrowers get their stock back. If you read the fine print on the account agreement for a margin account, you will see that you have given the brokerage the permission to silently loan your stocks out.  Since the lending has no financial impact on your portfolio, there's no particular reason to know and no particular protection required.  Actually, brokers typically don't bother going through the work of finding an actual stock to borrow.  As long as lots of their customers have stocks to lend and not that many people have sold short, they just assume there is no problem and keep track of how many are long and short without designating which stocks are borrowed from whom. When a stock becomes hard to borrow because of liquidity issues or because many people are shorting it, the brokerage will actually start locating individual shares to borrow, which is a more time-consuming and costly procedure.  Usually this involves the short seller actually talking to the broker on the phone rather than just clicking ""sell.""" If you enter a futures contract, it costs nothing.  So every time prices move against you, there is a margin call and you must put up some new money. Inverse ETF's use a variety of similar strategies to get their returns.  Many of these strategies may indeed require a margin call to the ETF issuer if prices move against you.  But remember the ETF did not cost nothing.  Investors contributed money in order to purchase each share of the ETF.  Therefore the ETF issuer has a big pot of money available for use as margin.  That's why the margin call never comes through to you. In a sense, you posted a ton of margin up front, so you won't have to make any additional margin contributions.  The money that will be used for margin calls is being kept in treasuries and money market securities by the ETF issuer until it's needed. If prices move against you badly enough that it looks like the ETF is at risk to not be able to post margin, the ETF would liquidate and you'd get whatever pittance was left after they exit all those positions. They make money off you by increasing the spread you buy and sell your stocks through them.  So for example, if the normal spread for a stock was $10.00 for a buy and $10.02 for a sell, they might have a spread of $9.98 for the buy and $10.02 for the sell. So for an order of 1000 shares (approx. $10000) they would make $0.02 per share which would equal $20.00. What I did not understand when I first called is that margin able account means the ability to borrow margin, but not the necessity of borrowing. Like I was saying, it is something I am going to do a lot of due diligence on before I plunge in. I have a general vague idea of futures, and thus why I was asking for info on the matter. If the underlying is currently moving as aggressively as stated, the broker would immediately forcibly close positions to maintain margin.  What securities are in fact closed depends upon the internal algorithms. If the equity in the account remains negative after closing all positions if necessary, the owner of the account shall owe the broker the balance.  The broker will close the account and commence collections if the owner of the account does not pay the balance quickly. Sometimes, brokers will impose higher margin requirements than mandated to prevent the above eventuality. Brokers frequently close positions that violate internal or external margin requirements as soon as they are breached.