When do I need to return short stock to the lender
"If the owner of the stock wants it back, they ""call"" it back. There are no guarantees of how long you can keep it for your short, or the cost involved to hold it.  Usually, everyone knows about a particular set-up (e.g. a warrant or convertible bond mispricing) that is attractive for arbitrage. This causes the associated stock to be in high demand thus expensive to borrow for shorting, or impossible to find for any price at all."
"There's several approaches to the stock market. The first thing you need to do is decide which you're going to take. The first is the case of the standard investor saving money for retirement (or some other long-term goal). He already has a job. He's not really interested in another job. He doesn't want to spend thousands of hours doing research. He should buy mutual funds or similar instruments to build diversified holdings all over the world. He's going to have is money invested for years at a time. He won't earn spectacular amazing awesome returns, but he'll earn solid returns. There will be a few years when he loses money, but he'll recover it just by waiting. The second is the case of the day trader. He attempts to understand ultra-short-term movements in stock prices due to news, rumors, and other things which stem from quirks of the market and the people who trade in it. He buys a stock, and when it's up a fraction of a percent half an hour later, sells it. This is very risky, requires a lot of attention and a good amount of money to work with, and you can lose a lot of money too. The modern day-trader also needs to compete with the ""high-frequency trading"" desks of Wall Street firms, with super-optimized computer networks located a block away from the exchange so that they can make orders faster than the guy two blocks away. I don't recommend this approach at all. The third case is the guy who wants to beat the market. He's got long-term aspirations and vision, but he does a lot more research into individual companies, figures out which are worth buying and which are not, and invests accordingly. (This is how Warren Buffett made it big.) You can make it work, but it's like starting a business: it's a ton of work, requires a good amount of money to get going, and you still risk losing lots of it.  The fourth case is the guy who mostly invests in broad market indexes like #1, but has a little money set aside for the stocks he's researched and likes enough to invest in like #3. He's not going to make money like Warren Buffett, but he may get a little bit of an edge on the rest of the market. If he doesn't, and ends up losing money there instead, the rest of his stocks are still chugging along. The last and stupidest way is to treat it all like magic, buying things without understanding them or a clear plan of what you're going to do with them. You risk losing all your money. (You also risk having it stagnate.) Good to see you want to avoid it. :)" You are correct that 20% has an impact on your interest rate, although it is not always hugely significant.  You would have to do your own shopping around to find that information out.  However 20% has an impact that I consider to be far more important than your monthly payment, and that is in your equity.  If the DC market tanks, which I know it has not really done like much of the country but none of us have crystal balls to know if it will or not, then you will be more easily underwater the less you put down.  Conversely putting 20% or more down makes you an easy sell to lenders [i]and[/i] means that you don't have to worry nearly so much about having to do a short sale in the future. I would never buy a house with less than 20% down personally and have lived well below my means to get there, but I am not you. With regards to mortgages, the cheapskate way that I found information that I needed was to get books from the library that explained the mortgage process to me.  When it came time to select an actual broker I used my realtor's recommendation (because I trusted my realtor to actually have my interests at heart because he was an old family friend - you can't usually do that so I don't recommend it) and that of others I knew who had bought recently.  I compared four lenders and competed them against each other to get the best terms.  They will give you estimate sheets that help you weigh not only rates but costs of different fees such as the origination fee and discount points.  Make sure to know what fees the lender controls and what fees (s)he doesn't so that you know which lines to actually compare. Beyond a lender make sure that before closing you have found a title company that you think is a good choice (your realtor or lender will try to pick one for you because that's the way the business is played but it is a racket - pick one who will give you the best deal on title), a settlment company (may be title company, lender, or other) that won't charge you an excessive amount, a survey company that you like if required in DC for your title insurance, and homeowner's insurance coverage that you think is a good deal.  The time between contract and closing is short and nobody tells you to research all the closing costs that on a $500,000 place run to in excess of $10,000, but you should.  Also know that your closing costs will be about 2% of the purchase price and plan accordingly. In general take some time to educate yourself on homebuying as well as neighborhoods and price ranges.  Don't rush into this process or you will lose a lot of money fast. "For a two year time frame, a good insured savings account or a low-cost short-term government bond fund is most likely the way I would go. Depending on the specific amount, it may also be reasonable to look into directly buying government bonds. The reason for this is simply that in such a short time period, the stock market can be extremely volatile. Imagine if you had gone all in with the money on the stock market in, say, 2007, intending to withdraw the money after two years. Take a broad stock market index of your choice and see how much you'd have got back, and consider if you'd have felt comfortable sticking to your plan for the duration. Since you would likely be focused more on preservation of capital than returns during such a relatively short period, the risk of the stock market making a major (or even relatively minor) downturn in the interim would (should) be a bigger consideration than the possibility of a higher return. The ""return of capital, not return on capital"" rule. If the stock market falls by 10%, it must go up by 11% to break even. If it falls by 25%, it must go up by 33% to break even. If you are looking at a slightly longer time period, such as the example five years, then you might want to add some stocks to the mix for the possibility of a higher return. Still, however, since you have a specific goal in mind that is still reasonably close in time, I would likely keep a large fraction of the money in interest-bearing holdings (bank account, bonds, bond funds) rather than in the stock market. A good compromise may be medium-to-high-yield corporate bonds. It shouldn't be too difficult to find such bond funds that can return a few percentage points above risk-free interest, if you can live with the price volatility. Over time and as you get closer to actually needing the money, shift the holdings to lower-risk holdings to secure the capital amount. Yes, short-term government bonds tend to have dismal returns, particularly currently. (It's pretty much either that, or the country is just about bankrupt already, which means that the risk of default is quite high which is reflected in the interest premiums demanded by investors.) But the risk in most countries' short-term government bonds is also very much limited. And generally, when you are looking at using the money for a specific purpose within a defined (and relatively short) time frame, you want to reduce risk, even if that comes with the price tag of a slightly lower return. And, as always, never put all your eggs in one basket. A combination of government bonds from various countries may be appropriate, just as you should diversify between different stocks in a well-balanced portfolio. Make sure to check the limits on how much money is insured in a single account, for a single individual, in a single institution and for a household - you don't want to chase high interest bank accounts only to be burned by something like that if the institution goes bankrupt. Generally, the sooner you expect to need the money, the less risk you should take, even if that means a lower return on capital. And the risk progression (ignoring currency effects, which affects all of these equally) is roughly short-term government bonds, long-term government bonds or regular corporate bonds, high-yield corporate bonds, stock market large cap, stock market mid and low cap. Yes, there are exceptions, but that's a resonable rule of thumb." As mentioned by Dilip, you need to provide more details. In general for transacting on stocks; Long Term: If you hold the stock for more than one year then its long term and not taxable. There is a STT [Securities Transaction Tax] that is already deducted/paid during buying and selling of a stock. Short Term: If you hold the stock for less than one year, it's short term gain. This can be adjusted against the short term loss for the financial year. The tax rate is 10%. Day Trading: Is same as short term from tax point of view. Unless you are doing it as a full time business. If you have purchased multiple quantities of same stock in different quantities and time, then when you selling you have to arrive at profit or loss on FIFO basis, ie First in First Out "My problem with your argument is that you don't have one.   I'm sorry you cannot grasp the difference between mortgage backed securities and company stock or the difference between a short sale and buying a credit default swap. You keep spouting unrelated ""facts"" as if the mean something.  Did big banks short sale FB?  Who knows?  Did they buy FB CDOs?  No they didn't.  There is no such thing. Did they buy credit default swaps? No." Obviously, you should not buy stock when the option is to pay down your debt. However, your question is different. Should you sell to reduce debt. That really depends on your personal situation. If you were planning to sell the stock anyway, go ahead and reduce your loans. Check out how the stock is doing and what the perspectives are. If the stock looks like it's going down, sell... Do you have savings? Unless you do, I should advise to sell the stock at any rate. If you do have savings, are they earning you more (in percentage) than your loans? If they are, keep them... If they short the contract, that means, in 5 months, they will owe if the price goes up (receive if the price goes down) the difference between the price they sold the future at, and the 3-month Eurodollar interbank rate, times the value of the contract, times 5. If they're long, they receive if the price goes up (owe if the price goes down), but otherwise unchanged. Cash settlement means they don't actually need to make/receive a three month loan to settle the future, if they held it to expiration - they just pay or receive the difference.  This way, there's no credit risk beyond the clearinghouse. The final settlement price of an expiring three-month Eurodollar futures (GE) contract is equal to 100 minus the three-month Eurodollar interbank time deposit rate. The issuer pays (negative money in this case) to the holder.  The person you sold your borrowed bond to gets this (negative) amount.  The person who you lent you the bond is eligible for that (negative) payment, they were the original holder of the bond.  When you return the bond you thus have to compensate the original holder.  Now turn around the cash flows and you're there. The new holder pays the issuer, the original holder pays you.