What a bank investment is, and why banks make them

A bank investment is money your bank puts into stocks, bonds, real estate, or other assets to make a return. Banks are not just holding vaults of cash. They take deposits from customers like you, lend some of it out as mortgages and business loans, and invest the rest in financial instruments that generate income. That income helps the bank pay you interest on your savings account and cover operating costs.

When you deposit money into a checking or savings account, you are not lending it to the bank—the bank owns it. The bank is then free to use that money however it wants, within regulatory limits. Some of it goes to customers who borrow. Some of it goes into investments. The bank keeps the difference between what it earns and what it pays you in interest.

This is a normal, legal part of banking. It is also why banks are regulated: the government requires them to hold enough cash and safe assets on hand so they can always pay you back if you withdraw your money.

Key Takeaways

  • Banks invest customer deposits in stocks, bonds, and other assets to generate income that covers their costs and pays you interest.
  • The Federal Reserve and the FDIC set rules about how much banks must keep in cash reserves and what kinds of investments they can make.
  • Your deposits are insured up to $250,000 per account type at FDIC-member banks, regardless of what the bank does with the money.
  • Banks must disclose their investment activities in quarterly financial reports, though most customers never see them.
  • When a bank makes a bad investment, regulators can force it to raise capital or merge with another bank before depositors lose money.

The types of investments banks typically make

Banks invest in government bonds most heavily. These are loans to the U.S. Treasury or state and local governments. They are considered very safe because the government is unlikely to default. A bank buys a Treasury bond, holds it for a set time, and collects interest payments. The return is lower than riskier investments, but the risk of losing money is also lower.

Banks also invest in mortgage-backed securities. These are bundles of home loans sold by the bank that originated them. A bank makes a mortgage, then sells it to an investment firm or another bank, which packages it with other mortgages and sells shares to investors. The bank collects a fee for originating the loan and may buy some of the securities itself. This spreads the risk of a homeowner defaulting across many investors.

Larger banks invest in corporate bonds and stocks. A corporate bond is a loan to a company; the bank lends money and collects interest. Stocks are ownership shares in companies. Both carry more risk than government bonds but offer higher potential returns. Banks also invest in real estate through commercial mortgages and property ownership, and in derivatives—complex financial contracts that bet on the future price of stocks, bonds, or commodities.

The mix of investments varies by bank size and strategy. A small community bank might hold mostly government bonds and mortgages. A large investment bank might hold a much wider range of assets, including stocks and derivatives.

How regulation limits what banks can invest in

The Federal Reserve and the FDIC (Federal Deposit Insurance Corporation) set rules about bank investments. Banks must hold a minimum amount of capital—money they own, not deposits—relative to the size and risk of their investments. This is called a capital requirement. If a bank invests heavily in risky assets, it must hold more capital to absorb losses.

Banks are also prohibited from investing in certain things. They cannot own more than a small percentage of a company's stock. They cannot invest in commodities like oil or gold directly (though they can trade them). They cannot use customer deposits to make venture capital bets. These rules exist to prevent banks from taking on too much risk with money that customers depend on.

The Volcker Rule, passed after the 2008 financial crisis, bars banks from making certain kinds of speculative trades using their own money. The rule is meant to separate the safer business of taking deposits and making loans from the riskier business of trading for profit.

When a bank violates these rules or makes investments that cause large losses, regulators can force it to raise more capital, stop certain activities, or merge with a stronger bank. The goal is to prevent a bank from failing and leaving depositors unable to access their money.

How your deposits stay protected even when banks invest

Your money is protected by FDIC insurance, which covers up to $250,000 per account type at each FDIC-member bank. This means if the bank invests poorly and loses money, you are still paid back up to that limit. The FDIC has a fund built from fees that banks pay; when a bank fails, the FDIC uses this fund to pay depositors.

This protection exists whether the bank invests conservatively or aggressively. The bank's investment strategy does not change your coverage. However, if you have more than $250,000 at one bank, the amount above that limit is not insured. If you want full coverage for a larger balance, you can split it across multiple banks or use different account types (a joint account and a single account at the same bank are insured separately).

The FDIC also requires banks to hold enough liquid assets—cash and things that can be turned into cash quickly—to meet customer withdrawals. Banks cannot invest all deposits in long-term assets. This is called the liquidity requirement.

What happens when a bank's investments fail

When a bank makes a bad investment, the loss comes out of the bank's capital first, not from customer deposits. If a bank buys a corporate bond and the company defaults, the bank loses money. But that loss is absorbed by the bank's shareholders and retained earnings, not by depositors.

If losses are large enough to wipe out the bank's capital, regulators step in. They may require the bank to raise new capital by selling stock, merge it with a stronger bank, or close it down. If a bank closes, the FDIC pays depositors from its insurance fund. This has happened fewer than 600 times since the FDIC was created in 1933.

During the 2008 financial crisis, many banks held large amounts of mortgage-backed securities that lost value when housing prices fell. Some banks failed. Others were rescued by the government or merged with competitors. Depositors were paid in full because of FDIC insurance, even though the banks' investments had failed.

How to find out what your bank invests in

Large banks publish quarterly financial reports called 10-Q filings with the SEC (Securities and Exchange Commission). These reports list the bank's investments in detail. You can find them on the SEC's website (sec.gov) by searching the bank's name, or on the bank's investor relations page.

These reports are dense and written for investors, not customers. They use accounting language and assume knowledge of finance. But they are public and free. If you want to know whether your bank holds a lot of risky assets or has taken large losses on investments, the 10-Q will tell you.

Smaller banks and credit unions may not file with the SEC, but they file reports with their regulators. You can request these reports by contacting the bank directly or filing a Freedom of Information Act request with the appropriate regulator (the Federal Reserve, the FDIC, or the OCC—Office of the Comptroller of the Currency).

For most customers, this level of detail is unnecessary. Your money is insured regardless of the bank's investment strategy. But if you want to know whether your bank is taking on significant risk, the information is out there.

The difference between bank investments and your personal investments

When a bank invests, it is using its own money and customer deposits to buy assets and hold them for income. When you invest, you are using your own money to buy assets with the goal of selling them later at a higher price or collecting income from them.

Banks are regulated heavily and must follow strict rules about what they can invest in. Individual investors have much more freedom. You can buy any stock, bond, or commodity you want (within tax law). A bank cannot.

Banks also have a different time horizon. They often hold investments for years or decades. Individual investors might hold for months or days. And banks have teams of analysts and traders making decisions. Individual investors usually make their own choices or follow advice from a financial advisor.

If you want to invest your own money, you would open a brokerage account, not a bank account. A brokerage account is not insured by the FDIC (though it may be insured by SIPC, the Securities Investor Protection Corporation, up to $500,000). The risk is on you.

Frequently Asked Questions

Does my bank invest my money without asking me?

Yes. When you deposit money into a bank account, you give the bank the right to use it. The bank does not need your permission to invest. However, the bank cannot use your money for certain high-risk activities, and it must keep enough cash on hand to pay you if you withdraw. Your account agreement explains this, though most people do not read it.

Can I lose my deposit if my bank's investments fail?

No, up to $250,000 per account type. The FDIC insures your deposit regardless of what the bank does with the money. If the bank fails, the FDIC pays you back. If you have more than $250,000 at one bank, the excess is not insured.

Why do banks invest if it is risky?

Banks invest because the income from investments is how they make money. Interest they pay you on savings accounts comes from the returns on their investments. Without investing, banks could not afford to pay interest or cover their operating costs. The risk is managed through regulation and capital requirements.

What is the safest bank to put my money in?

Any FDIC-member bank is equally safe up to the $250,000 insurance limit, because your deposit is insured the same way regardless of the bank's investment strategy. You can check whether a bank is FDIC-insured on the FDIC's website. Larger banks with more capital are generally considered safer for amounts above the insurance limit, but for insured deposits, the bank's size or investment strategy does not matter.

Can I tell my bank not to invest my money?

No. When you deposit money into a bank account, you accept that the bank will use it. If you do not want the bank to invest your money, you would need to keep cash at home, which carries its own risks (theft, fire, loss). The alternative is to put money into a money market fund or Treasury bills, which you control directly, though these are not bank accounts and are not FDIC-insured.