IRAs make money through investment returns, not by sitting idle

An IRA itself does not generate money. The money inside an IRA grows because you invest it in stocks, bonds, mutual funds, or other assets that produce returns. If you open an IRA and leave the cash sitting in it without buying anything, your balance stays flat. The account is a container — the investments inside are what earn.

The real power of an IRA comes from two things working together: the investments you choose and the time those investments have to compound. A stock mutual fund might return 7 to 10 percent per year on average over decades. A bond fund might return 3 to 5 percent. Those returns reinvest automatically, meaning you earn returns on your previous returns. Over 20 or 30 years, that compounding effect turns modest annual gains into substantial wealth.

The IRA itself provides the tax shelter that makes this growth more efficient. In a traditional IRA, you do not pay taxes on the investment gains each year — only when you withdraw in retirement. In a Roth IRA, you pay no taxes on the gains ever, as long as you follow the withdrawal rules. That tax deferral means more of your money stays invested and working for you instead of going to the IRS.

Key Takeaways

  • An IRA grows only if you invest the money inside it; cash sitting in the account earns little to nothing.
  • Investment returns compound over time, meaning you earn returns on your previous returns, which is how modest annual gains become large sums.
  • Traditional IRAs defer taxes on investment gains until withdrawal, while Roth IRAs allow tax-free growth and withdrawals if you follow the rules.
  • The longer your money stays invested, the more time compound growth has to work, which is why starting early matters more than the size of your contribution.
  • Your actual returns depend on what you invest in — stocks typically return more over decades than bonds, but with more year-to-year volatility.

How compound returns work in an IRA

Compound growth means your investment earnings generate their own earnings. If you invest $5,000 in a fund that returns 8 percent annually, you earn $400 in year one. In year two, you earn 8 percent on $5,400 (your original $5,000 plus the $400 gain), which is $432. The extra $32 came from earning returns on your previous returns.

Over 30 years, that $5,000 grows to roughly $50,000 at 8 percent annual returns — a tenfold increase. Over 40 years, it becomes roughly $100,000. The difference between starting at age 25 and starting at age 35 is enormous, because you lose a decade of compounding. This is why financial advisors emphasize starting an IRA early, even if you can only contribute small amounts.

The compounding effect only works if you leave the money invested. Withdrawing early breaks the chain. It also triggers taxes and penalties in most cases, which is why IRAs are designed for long-term saving rather than short-term access.

What types of investments go inside an IRA

When you open an IRA at a bank or brokerage, you choose what to invest in. Common options include stock mutual funds, bond funds, target-date funds (which automatically shift from stocks to bonds as you near retirement), individual stocks, and exchange-traded funds (ETFs). Some IRAs also allow real estate, precious metals, or other alternative investments, though these are less common and often come with higher fees.

Stock-heavy portfolios historically return more over decades but fluctuate more year to year. A portfolio of 100 percent stocks might return 8 to 10 percent annually on average, but you might see 20 percent gains one year and 30 percent losses another. Bond-heavy portfolios are steadier but return less — typically 3 to 5 percent annually. Most people use a mix based on their age and risk tolerance.

Your choice of investments matters far more than the IRA type itself. Two people with identical traditional IRAs will end up with very different balances if one invests in high-cost actively managed funds and the other invests in low-cost index funds. The difference in fees and returns compounds over decades.

The tax advantage that accelerates growth

In a taxable investment account (not an IRA), you owe taxes on investment gains each year, even if you do not withdraw the money. If your mutual fund earns $1,000 in gains and you are in the 24 percent tax bracket, you owe $240 in federal taxes that year. That $240 comes out of your account and stops compounding.

In a traditional IRA, those same $1,000 in gains are not taxed that year. The full $1,000 stays invested and compounds. You eventually pay taxes when you withdraw in retirement, but by then decades of compounding have happened tax-free. This deferral is especially powerful for high earners who expect to be in a lower tax bracket in retirement.

A Roth IRA goes further: you never pay taxes on the gains, as long as you do not withdraw before age 59½ and the account has been open for at least five years. This makes a Roth particularly valuable if you expect your income or tax rates to rise, or if you want to leave the account untouched for 40+ years.

How much you contribute versus how long you invest

Many people assume that contributing the maximum amount each year is what builds wealth. In reality, time matters more than the size of each contribution. Someone who contributes $500 per year starting at age 25 will end up with more money at 65 than someone who contributes $5,000 per year starting at age 45, assuming the same investment returns.

The IRS sets annual contribution limits — for 2024, the limit is $7,000 for people under 50 and $8,000 for people 50 and older. These limits change yearly. If you cannot reach the maximum, contributing what you can is still worthwhile because of the compounding effect. Even $100 per month invested for 30 years becomes substantial.

The real wealth-building strategy is consistency: contribute regularly, invest in a diversified mix appropriate for your age, and leave it alone. Trying to time the market or chase hot stocks usually costs more in fees and taxes than it gains in returns.

Why IRAs outpace regular savings accounts

A savings account at a bank currently earns around 4 to 5 percent annually, depending on the institution. An IRA invested in a stock index fund historically returns 8 to 10 percent annually over decades. The difference of 3 to 5 percentage points compounds dramatically over time.

A $10,000 contribution earning 4.5 percent in a savings account grows to roughly $56,000 over 40 years. The same $10,000 in a stock index fund earning 9 percent grows to roughly $312,000. The IRA's tax deferral adds another layer of advantage by keeping more of those gains working for you.

This does not mean you should move all your emergency savings into an IRA. Savings accounts are liquid and have no withdrawal penalties, while IRAs penalize early withdrawal. The right approach is to keep three to six months of expenses in a savings account, then invest additional money in an IRA for long-term growth.

Real returns versus nominal returns

When you see that a stock fund returned 9 percent last year, that is the nominal return — the raw percentage gain. The real return accounts for inflation. If inflation was 3 percent that year, your real return was roughly 6 percent, because your purchasing power only grew by that amount.

Over very long periods, stocks have historically returned about 7 percent real returns (after inflation). Bonds return about 2 to 3 percent real returns. This is why stocks are recommended for long-term IRA investing — they keep pace with and exceed inflation over decades. Money in a savings account earning 4.5 percent nominal might only earn 1 to 2 percent real return if inflation stays elevated.

Understanding real returns helps you set realistic expectations. Your IRA balance will grow in dollar terms, but the purchasing power of that growth depends on inflation over the decades you are invested.

Frequently Asked Questions

Can I lose money in an IRA?

Yes, if your investments decline in value. If you invest in stocks and the market drops 20 percent, your IRA balance drops 20 percent. However, historically the stock market has recovered from every downturn and reached new highs. The longer your time horizon, the less likely you are to be down when you need the money. Short-term market swings should not affect your decision to invest in an IRA if you are decades away from retirement.

What if I do not have much money to start with?

You can open an IRA with as little as $0 to $500, depending on the provider, and contribute small amounts regularly. Many brokerages have no minimum balance requirement. Even $50 or $100 per month invested consistently will grow substantially over 30 or 40 years because of compounding. Starting small is far better than waiting until you can afford a large lump sum.

Do I have to pick individual stocks, or can I use funds?

You can use either. Most people use mutual funds or ETFs because they are diversified (spreading your money across many companies) and require less research than picking individual stocks. A single target-date fund can be your entire IRA — it automatically adjusts from stocks to bonds as you approach retirement. This is simpler and often cheaper than managing individual holdings.

How often should I check my IRA balance?

Checking quarterly or annually is reasonable. Checking daily or weekly often leads to panic selling during market downturns, which locks in losses. Your IRA is designed for long-term growth, so short-term fluctuations should not trigger changes to your investment mix. Rebalance once per year if your target allocation has drifted significantly.

What happens to my IRA if I change jobs?

Your IRA is separate from your employer, so changing jobs does not affect it. If your employer offered a 401(k), you can roll that balance into your IRA when you leave, which often gives you more investment choices and lower fees. Your IRA continues growing regardless of where you work.