Option spreads in registered accounts
From my own personal experience, you cannot trade spreads in RRSP or TFSA accounts in Canada. You can only buy options (buy a call or buy a put) or you can sell calls against your stock (covered call selling). You will not be able to sell naked options, or trade any type of spread or combo (calendars, condors, etc). I am not sure why these are the rules, but they are at least where I trade those accounts.
"Not all call options that have value at expiration, exercise by purchasing the security (or attempting to, with funds in your account).   On ETNs, they often (always?) settle in cash.  As an example of an option I'm currently looking at, AVSPY, it settles in cash (please confirm by reading the documentation on this set of options at http://www.nasdaqomxtrader.com/Micro.aspx?id=Alpha, but it is an example of this).  There's nothing it can settle into (as you can't purchase the AVSPY index, only options on it).  You may quickly look (wikipedia) at the difference between ""American Style"" options and ""European Style"" options, for more understanding here. Interestingly I just spoke to my broker about this subject for a trade execution.  Before I go into that, let me also quickly refer to Joe's answer:  what you buy, you can sell.  That's one of the jobs of a market maker, to provide liquidity in a market.  So, when you buy a stock, you can sell it.  When you buy an option, you can sell it.  That's at any time before expiration (although how close you do it before the closing bell on expiration Friday/Saturday is your discretion).  When a market maker lists an option price, they list a bid and an ask.  If you are willing to sell at the bid price, they need to purchase it (generally speaking).  That's why they put a spread between the bid and ask price, but that's another topic not related to your question -- just note the point of them buying at the bid price, and selling at the ask price -- that's what they're saying they'll do. Now, one major difference with options vs. stocks is that options are contracts. So, therefore, we can note just as easily that YOU can sell the option on something (particularly if you own either the underlying, or an option deeper in the money).  If you own the underlying instrument/stock, and you sell a CALL option on it, this is a strategy typically referred to as a covered call, considered a ""risk reduction"" strategy.  You forfeit (potential) gains on the upside, for money you receive in selling the option. The point of this discussion is, is simply: what one buys one can sell;  what one sells one can buy -- that's how a ""market"" is supposed to work.  And also, not to think that making money in options is buying first, then selling.  It may be selling, and either buying back or ideally that option expiring worthless. -- Now, a final example.  Let's say you buy a deep in the money call on a stock trading at $150, and you own the $100 calls.  At expiration, these have a value of $50.  But let's say, you don't have any money in your account, to take ownership of the underlying security (you have to come up with the additional $100 per share you are missing).  In that case, need to call  your broker and see how they handle it, and it will depend on the type of account you have (e.g. margin or not, IRA, etc).  Generally speaking though, the ""margin department"" makes these decisions, and they look through folks that have options on things that have value, and are expiring, and whether they have the funds in their account to absorb the security they are going to need to own.  Exchange-wise, options that have value at expiration, are exercised.  But what if the person who has the option, doesn't have the funds to own the whole stock? Well, ideally on Monday they'll buy all the shares with the options you have at the current price, and immediately liquidate the amount you can't afford to own, but they don't have to.  I'm mentioning this detail so that it helps you see what's going or needs to go on with exchanges and brokerages and individuals, so you have a broader picture." It is a general truism but the reasons are that the rules change dramatically when you simply have more capital. Here are some examples, limited to particular kinds of markets: Under $2,000 in capital Nobody is going to offer you a margin account, and if you do get one it isn't with the best broker on commissions and other capabilities. So this means cash only trading, enjoy your 3 business day settlement periods. This means no shorting, confining a trader to only buy and hold strategies, making them more dependent on luck than a more capable trader. This means it is more expensive to buy stock, since you have to put down 100% of the cash to hold a share, whereas someone with more money puts down less capital to hold the exact same number of shares. This means no covered options strategies or spreads, again limiting the market directions where a trader could earn Under $25,000 in capital In the stock market, the pattern day trader rule applies to retail margin accounts with a balance under $25,000 and this severally limits the kinds of trades you are able to take because of the limit in the number of trades you can take in a given time period. Forget managing a multi-leg option position when the market isn't moving your direction. Under $125,000 in capital Worse margin rules. You excluded portfolio margin from your post, but it is a key part of the answer Over $1,000,000 in capital Participate in private placements, regulation D offerings reserved for accredited investors. These days, as buy and hold investments, these generally have more growth potential than publicly traded offerings. Over $5,000,000 in capital You can easily get the compliance and risk manager to turn the other way on margin rules. This is not conjecture, leverage up to infinity, try not to bankrupt yourself and the trading firm. An option gives you the legal right to buy stock. However, you cannot exercise a stock option unless you have the ability to buy the stock. In the United States, securities not fully registered with the SEC for public sale cannot be purchased except by qualified investors. The short answer is that it depends on the taxation laws in your country. The long answer is that there are usually tax avoidance mechanisms that you can use which may make it more economically feasible for you to go one way or the other. Consider the following: The long term average growth rate of the stock market in Australia is around 7%.  The average interest on a mortgage is 4.75%.  Assuming you have money left over from a 20% deposit, you have a few options.  You could: 1) Put that money into an index fund for the long term, understanding that the market may not move for a decade, or even move downwards; 2) Dump that money straight into the mortgage; 3) Put that money in an offset account Option 1 will get you (over the course of 30-40 years) around 7% return.  If and when that profit is realised it will be taxed at a minimum of half your marginal tax rate (probably around 20%, netting you around 5.25%) Option 2 will effectively earn you 4.75% pa tax free Option 3 will effectively earn you 4.75% pa tax free with the added bonus that the money is ready for you to draw upon on short notice. Of the three options, until you have a good 3+ months of living expenses covered, I'd go with the offset account every single time. Once you have a few months worth of living expenses covered, I would the adopt a policy of spreading your risk.  In Australia, that would mean extra contributions to my Super (401k in the US) and possibly purchasing an investment property as well (once I had the capital to positively gear it). Of course, you should find out more about the tax laws in your country and do your own maths. In the case of regulated, exchange-traded options, the writer of an options contract is obliged to maintain a margin with their broker, and the broker is obliged to maintain a margin with the clearing house.  (Institutional writers of options will deal directly with the clearing house.) In the event that the writer is unable to make a daily margin call, the broker (or clearing house) may automatically close out (all of) their positions using existing margin held.  If there was a shortfall, the broker (or clearing house) would be left to persue the client (writer) to make good on their obligations. None of this effects the position of the original buyer of the options contract.  Effectively, the buyer's counterparty is their broker's clearing house account. 1.45 and 1.40 are the last trade prices.  The last trade (1.45) for the 27 strike call must have occurred earlier than the last trade (1.40) for the 26 strike call.  These options have low liquidity and don't trade very often.  You have to look at the bid and ask prices to see what people are currently bidding and asking for those options.  As you can see, the premium based on the bids and asks does decrease the further you go out of the money. Exchange traded options are issued in a way that there is no counter party risk.  Consider, stocks and options are held in street name. So, for example, if I am short and you are long shares, no matter what happens on my end, your shares are yours.  To be complete, it's possible to enter into a direct deal, where you have a contract for some non-standard option, but that would be very rare for the average investor. if you open spreadbetting accounts and prove to the inland revenue that trading profits are not your main income, you will not be liable for any tax on your gains.  Holding a property in the uk which is point of call for any held bank accounts needs to be verifiable though.  This is only an issue if accounts are larger than £400k. seems anything smaller doesnt get the sniffer dogs attention at the IR dept.