Interactive Brokers Margin Accounts
"Scenario 1 - When you sell the shares in a margin account, you will see your buying power go up, but your ""amount available to withdraw"" stays the same until settlement. Yes, you can reallocate the same day, no need to wait until settlement. There is no margin interest for this scenario.  Scenario 2 -  If that stock is marginable to 50%, and all you have is $10,000 in that stock, you can buy another $10,000. Once done, you are at 50% margin, exactly." You have to call Interactive Brokers for this. This is what you should do, they might even have a web chat. These are very broker specific idiosyncrasies, because although margin rules are standardized to an extent, when they start charging you for interest and giving you margin until settlement may not be standardized. I mean, I can call them and tell you what they said for the 100 rep.
While most all Canadian brokers allow us access to all the US stocks, the reverse is not true.  But some US brokers DO allow trading on foreign exchanges. (e.g. Interactive Brokers at which I have an account).  You have to look and be prepared to switch brokers.  Americans cannot use Canadian brokers (and vice versa). Trading of shares happens where-ever two people get together - hence the pink sheets.  These work well for Americans who want to buy-sell foreign stocks using USD without the hassle of FX conversions.  You get the same economic exposure as if the actual stock were bought.   But the exchanges are barely policed, and liquidity can dry up, and FX moves are not necessarily arbitraged away by 'the market'.  You don't have the same safety as ADRs because there is no bank holding any stash of 'actual' stocks to backstop those traded on the pink sheets. Option tiers are broker specific, according mostly to their business model and presumably within the bounds of FINRA Rule 2111 (Suitability). The tier system can be as complex as E*Trade or as simple as none with Interactive Brokers. The suitability is determined presumably by compliance presumably by the legal history of the rule. The exact reasoning is political, effected by the relevant party composition of the legislature and executive. The full legal history will have the judiciary's interpretations of legislation and policy. Cash and margin rules are dictated primarily by the Federal Reserve and more precisely by FINRA and the SEC.  This is the only distinction made by IB. "I think to some extent you may be confusing the terms margin and leverage. From Investopedia Two concepts that are important to traders are margin and leverage. Margin is a loan extended by your broker that allows you to leverage the funds and securities in your account to enter larger trades. In order to use margin, you must open and be approved for a margin account. The loan is collateralized by the securities and cash in your margin account. The borrowed money doesn't come free, however; it has to be paid back with interest. If you are a day trader or scalper this may not be a concern; but if you are a swing trader, you can expect to pay between 5 and 10% interest on the borrowed money, or margin. Going hand-in-hand with margin is leverage; you use margin to create leverage. Leverage is the increased buying power that is available to margin account holders.  Essentially, leverage allows you to pay less than full price for a trade, giving you the ability to enter larger positions than would be possible with your account funds alone. Leverage is expressed as a ratio. A 2:1 leverage, for example, means that you would be able to hold a position that is twice the value of your trading account. If you had $25,000 in your trading account with 2:1 leverage, you would be able to purchase $50,000 worth of stock. Margin refers to essentially buying with borrowed money.  This must be paid back, with interest.  You also may have a ""margin call"" forcing you to liquidate assets if you go beyond your margin limits. Leverage can be achieved in a number of ways when investing, one of which is investing with a margin account." "It is not clear to me why you believe you can lose more than you put in, without margin. It is difficult and the chances are virtually nil. However, I can think of a few ways. Lets say you are an American, and deposit $1000. Now lets say you think the Indian rupee is going to devalue relative to the Euro. So that means you want to go long EURINR. Going long EURINR, without margin, is still different than converting your INRs into Euros. Assume USDINR = 72. Whats actually happening is your broker is taking out a 72,000 rupee loan, and using it to buy Euros, with your $1000 acting as collateral. You will need to pay interest on this loan (about 7% annualized if I remember correctly). You will earn interest on the Euros you hold in the meantime (for simplicity lets say its 1%). The difference between interest you earn and interest you pay is called the cost of carry, or commonly referred to as 'swap'. So your annualized cost of carry is $60 ($10-$70). Lets say you have this position open for 1 year, and the exchange rate doesnt move. Your total equity is $940. Now lets say an asteroid destroys all of Europe, your Euros instantly become worthless. You now must repay the rupee loan to close the trade, the cost of which is $1000 but you only have $940 in your account. You have lost more than you deposited, using ""no margin"". I would actually say that all buying and selling of currency pairs is inherently using margin, because they all involve a short sale. I do note that depending on your broker, you can convert to another currency. But thats not what forex traders do most of the time." Yes, via a margin account, one can trade or transfer on unsettled funds. These are tight regulations that begin with the Federal Reserve, extend to FINRA, and downward. In a cash account, this is not possible. Since speed is a necessity, a margin account can actually be approved nearly instantly. "Yes, Interactive Brokers is a good source for live data feeds and they have an API which is used to programmatically access the feeds, you will have to pay for data feeds from the individual data sources though.  The stock exchanges have a very high price for their data and this has stifled innovation in the financial sector for several decades in the united states. But at the same time, it has inflated the value and mystique of ""quants"" doing simple algorithms ""that execute within milliseconds"" for banks and funds.  Also RIZM has live feeds, it is a younger service than other exchanges but helps people tap into any online broker's feeds and let you trade your custom algorithms that way, that is their goal." I've looked into Thinkorswim; my father uses it. Although better than eTrade, it wasn't quite what I was looking for. Interactive Brokers is a name I had heard a long time ago but forgotten. Thank you for that, it seems to be just what I need. Most UK stock brokers don't require or allow margin trading.  A quick web search for 'UK share dealing comparison' shows entries from money.co.uk and moneysupermarket.com who both provide lists of different brokers, e.g. Barclays, Hargraves Lansdown, IG Share Dealing, The Share Centre, TD Direct, Interactive Investor, YouInvest, etc. Some of the UK banks also provide a share dealing service, from quickly looking at their websites, Barclays, HSBC and Halifax all appear to provide share dealing services.