Dividend Yield
The S&P 500 is an index, you can't buy shares of an index, but you can find index funds to invest in. Each company in that fund that pays dividends will do so on their own schedule, and the fund you've invested in will either distribute dividends or accumulate them (re-invest), this is pre-defined, not something they'd decide quarter to quarter. If the fund distributes dividends, they will likely combine the dividends they receive and distribute to you quarterly.  The value you've referenced represents the total annual dividend across the index, dividend yield for S&P500 is currently ~1.9%, so if you invested $10,000 a year ago in a fund that matched the S&P 500, you'd have ~$190 in dividend yield. Hart's answer regarding the difference between an index and a stock aside, remember that dividend yield is a passive measure.  It takes the announced dividend (which is a $/share amount) and divides it by the current market price.   So you can't assume that if you buy a stock that had a dividend yield of 4% for $100 that you're guaranteed 4% of the stock price in dividends.  If the price of the stock doubles, you'd still get $4, but the yield would drop to 2%.  Or the company could reduce (or even suspend) its dividends, which would reduce the yield if the stock price stayed flat. For an index like the S&P, it's easier to measure dividends on % yield terms rather then $/share terms since you'd have to own shares in every single company to get that amount, but on average the stocks in the S&P 500 pay X% in dividends (which are typically quarterly) - some pay more than that, some less, and some none at all.
"Probably the most important thing in evaluating a dividend yield is to compare it to ITSELF (in the past). If the dividend yield is higher than it has been in the past, the stock may be cheap. If it is lower, the stock may be expensive. Just about every stock has a ""normal"" yield for itself. (It's zero for non-dividend paying stocks.) This is based on the stock's perceived quality, growth potential, and other factors. So a utility that normally yields 5% and is now paying 3% is probably expensive (the price in the denominator is too high), while a growth stock that normally yields 2% and is now yielding 3% (e.g. Intel or McDonald'sl), may be cheap." At this time, Google Finance doesn't support historical return or dividend data, only share prices.  The attributes for mutual funds such as return52 are only available as real-time data, not historical.   Yahoo also does not appear to offer market return data including dividends. For example, the S&P 500 index does not account for dividends--the S&P ^SPXTR index does, but is unavailable through Yahoo Finance. "You have to be the owner of record before the ex-dividend date, which is not the same day as the date the dividend is paid. This also implies that if you sell on or after the ex-dividend date, you'll still get the dividend, even if you no longer own the stock.  Keep in mind, also, that the quoted price of the stock (and on any open orders that are not specifically marked as ""do not reduce"") on its ex-dividend date is dropped by the amount of the dividend, first thing in the morning before trading starts. If you happen to be the first order of the day, before market forces cause the price to move, you'll end up with zero gain, since the dividend is built into the price, and you got the same value out of it -- the dividend in cash, and the remaining value in stock. As pointed out in the comments (Thanks @Brick), you'll still get a market price for your trade, but the price reduction will have had some impact on the first trade of the day. Source: NYSE Rule 118.30 Also, remember that the dividend yield is expressed in annualized terms. So a 3% yield can only be fully realized by receiving all of the dividend payments made by the company for the year. You can, of course, forget about individual companies and just look for dividends to create your own effective yield over time. But, see the final point... Finally, if you keep buying and selling just to play games with the dividends, you're going to pay far more in transaction fees than you will earn in dividends. And, depending on your individual circumstances, you may end up paying more in capital gains taxes." The dividend is for a quarter of the year, three months. 80 cents is 3.9% of $20.51. Presumably the Div/yield changes as the stock price changes. On Yahoo, they specify that the yield is based on a particular stated date. So it's only the exact number if the stock trades at the price on that date. Yield can be thought of as the interest rate you would receive from that investment in the form of a dividend for stocks or interest payments on a bond.  The yield takes into account the anticipated amount to be received per share/unit per year and the current price of the investment.   Of course, the yield is not a guaranteed return like a savings account.  If the investment yield is 4% when you buy, it can drop in value such that you actually lose money during your hold period, despite receiving income from the dividend or interest payments. The return from one day to the next is based on the Day's closing price.  To be clear - opening prices can be quite different from the prior day close. In your example, they are pretty close, but this is not always the case. Just pull a larger data set to observe this.  The above aside, dividends are not reflected in the index, so, after a dividend has occurred, you'd need to account for this if you are looking for true total return. In 2011, the S&P closed at 1257.60 vs a 2010 year end 1257.64. The return, however was 2.11%, not zero, after accounting for the dividends. To me, articles that suggest the yearly return was zero are inaccurate and misleading. "The fact that dividends grow in perpetuity does not prevent one from calculating duration.  In fact, many academic papers look at exactly this problem, such as Lewin and Satchell.  This Wilmott thread discusses some of the pros and cons of the concept in some detail. PS: Although I was already broadly familiar with the literature and I use the duration of equities in some of my every-day work as a professional working in finance, I found the links above doing a simple google search for ""equity duration.""" I use the following method. For each stock I hold long term, I have an individual table which records dates, purchases, sales, returns of cash, dividends, and way at the bottom, current value of the holding. Since I am not taking the income, and reinvesting across the portfolio, and XIRR won't take that into account, I build an additional column where I 'gross up' the future value up to today() of that dividend by the portfolio average yield at the date the dividend is received. The grossing up formula is divi*(1+portfolio average return%)^((today-dividend date-suitable delay to reinvest)/365.25) This is equivalent to a complex XMIRR computation but much simpler, and produces very accurate views of return.  The 'weighted combined' XIRR calculated across all holdings then agrees very nearly with the overall portfolio XIRR. I have done this for very along time.  TR1933 Yes, 1933 is my year of birth and still re investing divis! "Good observation. In fact, the S&P index itself is guilty of not including dividends. So when you look at the index alone, the delta between any two points in time diverges, and the 20 return observed if one fails to include dividends is meaningless, in my my humble opinion. Yahoo finance will let you look at a stock ticker and offer you an ""adjusted close"" to include the dividend effect." Yield is almost always the mean rate of return. Then 1.65% yield means that you will see that rate of return inclusive of any coupons.   The way I like think of is that yield is the discount rate used to value the instrument at market value. DONT CONFUSE THE COUPON RATE WITH YIELD. Those are two completely separate things. "The Dividend Discount Model is based on the concept that the present value of a stock is the sum of all future dividends, discounted back to the present. Since you said: dividends are expected to grow at a constant rate in perpetuity ... the Gordon Growth Model is a simple variant of the DDM, tailored for a firm in ""steady state"" mode, with dividends growing at a rate that can be sustained forever. Consider McCormick (MKC), who's last dividend was 31 cents, or $1.24 annualized. The dividend has been growing just a little over 7% annually. Let's use a discount, or hurdle rate of 10%. MKC closed today at $50.32, for what it's worth. The model is extremely sensitive to inputs. As g approaches r, the stock price rises to infinity. If g > r, stock goes negative. Be conservative with 'g' -- it must be sustainable forever.  The next step up in complexity is the two-stage DDM, where the company is expected to grow at a higher, unsustainable rate in the early years (stage 1), and then settling down to the terminal rate for stage 2. Stage 1 is the present value of dividends during the high growth period. Stage 2 is the Gordon Model, starting at the end of stage 1, and discounting back to the present. Consider Abbott Labs (ABT). The current annual dividend is $1.92, the current dividend growth rate is 12%, and let's say that continues for ten years (n), after which point the growth rate is 5% in perpetuity. Again, the discount rate is 10%. Stage 1 is calculated as follows: Stage 2 is GGM, using not today's dividend, but the 11th year's dividend, since stage 1 covered the first ten years. 'gn' is the terminal growth, 5% in our case. then... The value of the stock today is 21.22 + 51.50 = 72.72 ABT closed today at $56.72, for what it's worth." Securities (things you can buy on the stock market)  that pay dividends usually pay every quarter (every three months), but some pay every month. (For example: PGF pays dividends each month.) IF you reinvest your dividends back into the stock then you will be compounding your return.  I use the feature at Scottrade to automatically reinvest the dividend each month. Using this feature at Scottrade incurs no commission for the purchases of the stock from the dividend. (saving on commissions and fees is, likely, the most important aspect of investing).  US Treasuries (usually) pay interest twice a year. There is no commission when using Treasury Direct. "I have 3 favorite sites that I use. http://www.nasdaq.com/symbol/mcd/dividend-history - lists the entire history of dividends and what dates they were paid so you can predict when future dividends will be paid. http://www.dividend.com/dividend-stocks/services/restaurants/mcd-mcdonalds/ - this site lists key stats like dividend yield, and number of years dividend has increased.  If the next dividend is announced, it shows the number of days until the ex-dividend date, the next ex-div and payment date and amount. If you just want to research good dividend stocks to get into, I would highly recommend the site seekingalpha.com.  Spend some time reading the articles on that site under the dividends section.  Make sure you read the comments on each article to make sure the author is not way off base. Finally, my favorite tool for researching good dividend stocks is the CCC Lists produced by Seeking Alpha's David Fish.  It is a giant spreadsheet of stocks that have been increasing dividends every year for 5+, 10+, or 25+ years.  The link to that spreadsheet is here: http://dripinvesting.org/tools/tools.asp under ""U.S. Dividend Champions""." Your example shows a 4% dividend.  If we assume the stock continues to yield 4%, the math drops to something simple. Rule of 72 says your shares will double in 18 years. So in 18 years, 1000 shares will be 2000, at whatever price it's trading.  Shares X (1.04)^N years = shares after N years. This is as good an oversimplification as any. Dividend yield is not the only criteria for stock selection. Companies past performance, management, past deals, future expansion plans, and debt equity ratio should be considered. I would also like to suggest you that one should avoid making any investment in the companies that are directly affected by frequent changes in regulations released by government. All the above mentioned criteria are important for your decision as they make an impact on your investment and can highly affect the profits.