How to tell if an option is expensive
An option, by definition, is a guess about the future value of the stock. If you guess too aggressively, you lose the purchase price of the option; if you guess too conservatively, you may not take the option or may not gain as much as you might have. You need to figure out what you expect to happen, and how confident you are about it, against the cost of taking the option -- and be reasonably confident that the change in the stock's value will be at least large enough to cover the cost of buying into the game. Opinion: Unless you're comfortable with expectation values and bell curves around them, it's significantly easier to lose money on options than to profit on them. And I'm not convinced that even statisticians can really do this well. I've always been told that the best use for options is hedging an investment you've already made; treating them as your primary bet is gambling, not investment. One way is to compare the implied volatility with the realised volatility over a period similar to the time left to expiry. However there are plenty of reasons why the implied may be higher than the historical, for example because the market volatility has increased overall or because the underlying company is going to report their results before the option expires.
When I log in to Schwab to look at these options it tells me there's only Adjusted Options available on these terms: Adjusted Options:   Multiplier: 100; Deliverable: 15 PTIE; Cash: ---- It does confirm your July Call quote price of $0.05 because the contract, though priced for 100 shares, will only deliver 15 shares.  Separately, looking at the company website for news there was a 7 for 1 Reverse Split announced on May 8, which is the culprit for this option adjustment and the seemingly nonsensical call price. In the scenario you describe, and really, in any scenario, by the nature of how option contracts work: a higher strike put will necessarily be more expensive than the lower strike put (everything else being equal). the lower strike call will necessarily be more expensive than the higher strike call (everything else being equal). In put options, the buyer has the right to sell stock for the strike price. So the higher the strike price, the more money the buyer of the put option can make by selling the shares of stock at a higher price. In call options, it's the exact opposite: buyers of the call option have the right to buy stock at the strike price. The lower the strike price, the better for the buyer: they have the right to buy stock for a lower amount of money. So it must be worth more. You need to set your status as self-employed the day you started online work. If that date is a little ambiguous (as is usually the case with online business), you can start with the day you first made any money. Yes, you can deduct expenses from your revenue. But you have to be sure that the expenses were purely business related.  This is how it goes: You inform HMRC about the day you started work. HMRC will assign you a UTR (Unique Tax Reference) number. Depending on how much you make you might or might not need to pay Class 2 NI contributions. You'll need to tell HMRC how much you expect to earn in the current tax year. Finally, you'll need to complete a Self-Assessment at the end of the tax year. I highly recommend setting up a business banking account. Here is a link that discusses being part-time self-employed in the UK. Considering how expensive insurance is now, We need to try single payer and any other means to lower our costs.  The problem today is that people without healthcare (e.g. Do not seek healthcare when a low cost option would work).  The result is that by the time uninsured go to the hospital it is very expensive. What we have today is not working, we should not have to pay 18-20% of our income to get health insurance. "I found your post while searching for this same exact problem. Found the answer on a different forum about a different topic, but what you want is a Cash Flow report.  Go to Reports>Income & Expenses>Cash Flow - then in Options, select the asset accounts you'd like to run the report for (""Calle's Checking"" or whatever) and the time period. It will show you a list of all the accounts (expense and others) with transactions effecting that asset. You can probably refine this further to show only expenses, but I found it useful to have all of it listed.  Not the prettiest report, but it'll get your there." Depending on the day and even time, you'd get your $2 profit less the $5 commission. Jack's warning is correct, but more so for thinly traded options, either due to the options having little open interest or the stock not quite so popular. In your case you have a just-in-the-money strike for a highly traded stock near expiration. That makes for about the best liquidity one can ask for.  One warning is in order - Sometime friday afternoon, there will be a negative time premium. i.e. the bid might seem lower than in the money value. At exactly $110, why would I buy the option? Only if I can buy it, exercise, and sell the stock, all for a profit, even if just pennies. "There are a few different ""kinds"" of implied volatility. They are all based on the IVs obtained from the option pricing model you use. (1) Basically, given a few different values (current stock price, time until expiration, right of option, exercise style, strike of the option, interest rates, dividends, etc), you can obtain the IV for a given option price. If you look at the bid of an option, you can calculate the IV for that bid. If you look at the ask, there's a different IV for the ask. You can then look at the mid price, then you have a different IV, and so on and so on. And that's for each strike, in each expiration cycle! So you have a ton of different IVs. (2) In many option trading platforms, you'll see another kind of IV: the IV for each specific expiration cycle. That's calculated based on some of the IVs I mentioned on topic (1). Some kind of aggregation (more on this later). (3) Finally, people often talk about ""the IV of stock XYZ"". That's, again, an aggregation calculated from many of the IVs mentioned on topic (1). Now, your question seems to be: which IVs, from which options, from which months, with which weight, are part of the expiration cycle IV or for the IV of the stock itself? It really depends on the trading platform you are talking about. But very frequently, people will use a calculation similar to how the CBOE calculates the VIX. Basically, the VIX is just like the IV described on topic (3) above, but specifically for SPX, the S&P 500 index. The very detailed procedure and formulas to calculate the VIX (ie, IV of SPX) is described here: http://cfe.cboe.com/education/vixprimer/about.aspx If you apply the same (or a similar) methodology to other stocks, you'll get what you could call ""the IV of stock XYZ""." "Because an equity option can be constructed at essentially any price by two willing counterparties on an exchange, there are not enough ISINs to represent the entire (i.e. infinite) option chain for even a single stock on a single expiration date.  As a result, ISINs are not generated for each individual possible options contract.  Instead the ISIN is used only to refer to the ""underlying"" symbol, and a separate formula is used to refer to the specific option contract for that symbol: So that code you pasted is not an ISIN but rather the standard US equity option naming scheme that you need to provide in addition to the ISIN when talking to your broker. Note that ISINs and formulas for referring to option contracts in other countries can behave quite differently.  Also, there are many countries and markets that don't need ISINs because the products in question only exist on a single exchange.  In those cases the exchange is pretty much free to make up whatever ID scheme it wants. P.S. Now I'm curious how option chains are identified for strike prices above $99,999.  I looked up the only stock I can think of that trades above that price (BRK.A), but it doesn't seem to have an option chain (or at least Google doesn't show it) ..."