Where investment returns come from

The return an investment produces usually comes from two places: the income it pays and the change in its market price. Income is cash the holder receives, such as interest on a bond or a dividend on a share. Price change is the difference between what the investment was worth when you bought it and what it is worth when you sell or measure it. Adding the two together gives the total return, and the balance between them differs widely from one type of investment to another.

Neither source is guaranteed. Income can be reduced or stop, and prices can fall. Understanding both parts makes it easier to see why an investment can pay a steady income and still lose value, or rise in price while paying nothing at all. It also helps explain why two investments with similar total returns can feel very different to hold, since one may deliver most of its return as regular payments while another delivers most of its return through price changes that have not yet been realized.

Income from interest and dividends

Interest is the payment a borrower makes for the use of money. A bond pays interest according to its terms, usually as a fixed amount per year based on its face value, until it matures. If the issuer cannot make a payment on time, the bond is said to be in default, and the holder may receive less than was promised. A savings account pays interest too, but the rate is set by the bank and can change.

Dividends are payments a company may make to its shareholders out of profits, usually calculated per share. The company's board of directors decides whether to pay, how much to pay and whether to change the amount. A company can increase a dividend, reduce it or stop it altogether, so a dividend should be understood as a decision rather than a contract. Investors who rely on income often look at how consistently an investment has paid and at what the payment depends on, rather than at the size of any single payment.

Some investors also compare the cash an investment pays with its current market price, a figure often called the yield. That comparison is useful for seeing how much income different holdings produce for each dollar they cost today. It is not a measure of total return, however, because it leaves out any change in the price after the comparison is made.

What moves market prices

Price changes reflect what buyers are willing to pay for an investment at a given time. For a share, that willingness is shaped largely by expectations about the company's future earnings and cash flows, broader economic conditions, interest rates and investor sentiment. For a bond, the market price tends to move in the opposite direction of market interest rates. A fixed payment is worth more when new bonds offer lower rates and less when new bonds offer higher ones.

These drivers interact in complicated ways, and short-term price moves are difficult to predict. Prices can drift well away from what a simple calculation would suggest for long stretches. For that reason, the price part of a return is usually the most variable component, and it is the part that can change the total result the most from one period to the next.

Adding the two parts together

The total return can be calculated in a few steps:

1. Add up the income received during the period.
2. Subtract the starting value from the ending value to find the price change.
3. Add the income and the price change, then divide by the starting value.

Consider a hypothetical investment that costs $100, pays $2 of income over the year and rises in price to $105. The total return is ($2 + $5) divided by $100, or 7 percent. If the price fell to $95 instead, with the same $2 of income, the total return would be ($2 minus $5) divided by $100, or negative 3 percent. Income softens a price decline but does not remove it. The calculation also ignores fees and taxes, both of which reduce what an investor keeps, so the figure is a measure before those costs rather than the amount an investor ends up with.

Looking at only one part of the return can mislead. An investor who focuses on income may overlook a falling price, while an investor who looks only at price changes may miss the steady contribution that payments make over time. Both parts belong in the picture.

Why returns are never guaranteed

No investment's return is promised in advance, even when its income has been steady. A company can cut a dividend, a borrower can default on a bond and a fund's price can fall in a broad market decline. Past returns describe what happened, not what will happen, which is why an investment's history should be read alongside its risks rather than on its own.

A useful habit is to ask, for any investment you consider, which part of its return it depends on most and what would happen to your money if that part stopped working as expected. An investment that depends on steady income may struggle if the payment is cut. One that depends on rising prices may disappoint if the market turns. Answering that question clarifies whether the investment fits the purpose you have in mind.