Investment returns tell you how much an investment gained or lost compared with the money you put in. If 1,000 becomes 1,100 without extra deposits, withdrawals, income payments or costs, the return is 10%. But if you added the extra 100 yourself, a bigger balance does not mean you earned 10%.
This Money & Why beginner guide uses made-up examples, not a real investor’s results. All amounts use the same imaginary currency unit. The arithmetic works in any currency when the units and scope stay consistent. This is general education, not a recommendation or a forecast. Sources were checked on September 8, 2026.
Start with money earned, not the balance on the screen
Imagine opening your app after payday. The balance is higher, and it feels like good news for your investments. Before celebrating the return, ask a simpler question: did the investments grow, or did your paycheck top up the account?
Both can help you build savings. They just measure different things. A contribution is money you add. A gain or loss is the result of what happened to your investment. A percentage return puts that result in proportion to the starting amount.
Investment returns in three small steps
For one simple investment with no extra cash flows, take the ending value, subtract the starting amount, and divide the difference by the starting amount. Then multiply by 100 to show a percentage. For this first example, leave income, fees and taxes out of the calculation.
Return (%) = (ending value − starting amount) ÷ starting amount × 100
- Start with 1,000 and finish with 1,100: 100 ÷ 1,000 × 100 = 10%.
- Start with 1,000 and finish with 900: −100 ÷ 1,000 × 100 = −10%.
- Start with 10,000 and earn 500: 500 ÷ 10,000 × 100 = 5%.
The last investor earned more money than the first, but a smaller percentage. That does not tell us which investment was more suitable. We have not compared time, risk or access to the money. Also, divide by the starting amount, not the ending balance: you are measuring the result against what went in.
Count dividends and costs once, not twice
A dividend is a payment a company makes to shareholders. If the investment paid you income, a price-only calculation can miss part of the result. FINRA’s investment return guide explains why income and investment costs belong in a performance calculation, not just price changes.
Here is a separate imaginary example. You invested 1,000. The shares are now worth 1,100, and you received 20 in cash dividends. If that 20 is outside the 1,100 figure and was not reinvested, the gain before fees and taxes is 120. The return is 12%.
However, if 1,100 is the account’s total value and already includes that cash, adding 20 again would count the same money twice. Read the app’s labels. “Value of shares” and “total account value” may describe different things.
Costs need the same care. A purchase fee paid separately adds to your initial outlay. A selling fee deducted from sale proceeds reduces what you receive. Do not subtract a fee again if it is already included in the figure you are using. Tax treatment depends on your location, account and circumstances; no single tax rate fits everyone.
Extra deposits change the question
Suppose Alex starts with 1,000, adds 100 later and ends with 1,100. With no other movements, the account can reach that value without any investment gain. Calling the balance increase a 10% return would give the investments credit for Alex’s saving.
For a basic money-gain check across an account, separate outside cash flows: ending total value plus money taken out, minus starting total value and money added. Include payments sent outside the account consistently. Selling shares and leaving the cash inside the same account is not an outside withdrawal.
This gives a money amount, not automatically a reliable percentage return for regular contributions. A deposit made yesterday was not invested for as long as money added a year ago. Ask the provider whether its figure reflects your deposit dates or adjusts for outside cash flows to show investment performance.
If the account started at zero, do not divide by zero or quietly swap in another number. Find the report’s starting date and method. A clear calculation method is more useful than a percentage that happens to look tidy.
Put dates beside investment returns
A 10% result over one month is not the same pace as 10% over three years. Write down both dates whenever you compare figures. And a strong month does not tell you what the next eleven months will bring.
An annualized return expresses a longer result as an equivalent yearly compound rate. FINRA’s performance explanation distinguishes that calculation from simply dividing a total percentage by the number of years.
For example, 1,000 growing to 1,210 over exactly two years, with no other cash flows, is a 21% total gain. The equivalent yearly rate is 10%, because 1,000 × 1.10 × 1.10 = 1,210. It does not prove that each individual year actually returned 10%. The route between those two dates could have been bumpy.
Four ways to check your own figures
1. New to investing? Practice on one simple holding
Choose a holding without extra deposits during the period. Note the start, end and dates, then calculate the gain and percentage separately. Next, check for dividends and fees. This is a useful first exercise, but it will not explain a busy account with many transactions. Keep account numbers and personal documents out of public comments.
2. Adding money monthly? Collect the dates first
Download or write down each contribution and withdrawal. Ask your provider for a report that separates contributions from gains. If your own money-gain check differs from the app, compare the time period, cash flows and cost treatment before assuming either figure is wrong. The limitation is timing: one simple fraction cannot capture every pattern of deposits accurately.
3. Comparing options? Make the comparison fair
Match the dates, currency and treatment of income and costs. Then ask how much each investment could lose and how quickly you could access the money. If you will spend in another currency, exchange-rate changes can affect the result you experience. A higher past return alone does not make an investment suitable for an upcoming bill or retirement spending.
4. Trying to get back to even? Recheck the starting point
When 1,000 falls to 800, the loss is 20%. Getting from 800 back to 1,000 needs a gain of 200 ÷ 800 × 100 = 25%. The base has changed. This is not a target you must chase by taking more risk. Check when you need the money and what further loss would do to your plans. Borrowing or choosing an unfamiliar product can make a recovery attempt more dangerous.
Quick questions people often ask
Does a bigger account balance always mean a positive return?
No. Deposits can outweigh investment losses. Separate the money you added before judging the investment result.
Can I measure a return before I sell?
Yes, using the current value gives an unrealized result. The actual amount available after selling can differ because prices, fees and execution conditions may change.
Does annualized mean guaranteed each year?
No. It is a way to describe a past result over a period. It does not smooth out the actual ups and downs or promise future performance.
Try this before your next account check
Write three short answers: How much did I add? What does the displayed figure include? Which dates does it cover? Once those are clear, the percentage becomes much easier to interpret.
For the next building block, read how compound interest works. It explains why reinvesting changes the calculation over time, and why fees and losses still matter.