Saving vs investing
Savings are safe but grow slowly. Investments go up and down, sometimes a lot, but over long periods they have grown much faster than prices. That’s why investing suits retirement and other goals years away, and savings suit your emergency fund and near-term plans.
Stocks, bonds and funds
| What | You own | Typical behavior |
|---|---|---|
| Stocks | A small part of a company | Highest long-run growth, big ups and downs |
| Bonds | A loan to a government or company | Steadier, lower long-run growth |
| Index fund/ETF | A slice of every company in an index | The market’s return, minus a small fee |
Why index funds
- Diversification: one fund can hold the whole US stock market, so one company failing barely matters.
- Low fees: many index funds charge under 0.1% a year. A 1% fee can cost you a fifth or more of your money over 30 years.
- They’re hard to beat: over long periods, most funds that pick stocks do worse than the index after their fees.
After 30 years you’d have
$200,903
- You put in$72,000
- Growth$128,903
Start ten years later and you’d have $92,408: $108,495 less, though you’d only put in $24,000 less.
Returns aren’t guaranteed and vary from year to year. This assumes the same return every year, before fees and tax.
How regular investing adds up
Small amounts grow into large ones given time, because growth builds on earlier growth:
The calculator's starting example: $10,000 now and $500 a month for 20 years at 7% a year, compounded monthly, grows to $300,851. You put in $130,000; the other $170,851 is interest, more than you saved yourself.
Saving a set amount each month from nothing, at 7% a year:
| A month | 10 years | 20 years | 30 years |
|---|---|---|---|
| $100 | $17,308 | $52,093 | $121,997 |
| $250 | $43,271 | $130,232 | $304,993 |
| $500 | $86,542 | $260,463 | $609,986 |
| $1,000 | $173,085 | $520,927 | $1,219,971 |
Going from 20 to 30 years doesn't add half as much again: it more than doubles the total, because the last ten years earn interest on everything built up before them.
| Rate | Rule of 72 | Actual years to double |
|---|---|---|
| 3% | 24 | 23.4 |
| 4% | 18 | 17.7 |
| 6% | 12 | 11.9 |
| 8% | 9 | 9 |
| 10% | 7.2 | 7.3 |
These assume the same return every year. Real returns go up and down, so treat them as a guide. The compound interest calculator runs your own numbers.
Which account to use first
- Your 401(k), up to the full employer match. It’s an instant return on your money.
- A Roth or traditional IRA: up to $7,500 in 2026. See Roth vs traditional.
- More in your 401(k), up to $24,500 in 2026.
- A regular brokerage account for anything beyond that, or for goals before retirement.
Risk and staying the course
The stock market has had falls of 20% or more many times and recovered from all of them so far, though it can take years. The biggest risk for most people is selling in a panic. Investing a set amount every month, whatever the market does, takes the guesswork out.
One-fund option: a target-date fund picks a mix of stocks and bonds for the year you plan to retire, and gets steadier as you get closer.
Taxes on investments
- Inside a 401(k) or IRA, there’s no tax on growth each year. Traditional accounts are taxed when you take the money out, Roth accounts not at all if you follow the rules.
- In a regular brokerage account, dividends are taxed each year, and selling at a gain is taxed too: at lower rates on investments held more than a year. See the capital gains tax calculator.
Common mistakes
- Trying to time the market: missing a few of the best days can cut long-run returns sharply, and they often come right after the worst ones.
- Paying high fees without noticing: check each fund’s expense ratio.
- Putting too much in one company, including the one you work for.
- Investing money you’ll need soon, then having to sell after a fall.
Getting started
- Make sure you have an emergency fund and no high-interest debt.
- Open an account with a low-cost broker, or use your 401(k).
- Choose a broad index fund or a target-date fund.
- Set up an automatic monthly investment, and leave it alone.