Banks make money by loaning customer deposits and earning interest

Fractional reserve banking creates deposits from loans, not the other way around

The traditional view of banking is that customers deposit money into the bank and the bank lends out those deposits. That's partly true, but most banks work by making loans first, which creates an asset on their balance sheet as a corresponding deposit. Banks often operate under a money multiplier ratio, lending out several times their total reserves.

Different CDs can have different term lengths, interest rates, and more

For instance, if a bank needs more deposits to fund loans, then it may offer high interest rates to attract deposits. Alternatively, a large bank with sufficient deposit reserves may have less incentive to grow its CD portfolio, offering lower rates as a result.

Bank runs, explained

A major feature of the modern financial system is trust: if an institution loses it, customers will quickly withdraw deposits and stockholders will sell their shares. This digestible animated video looks into the nature and history of bank runs and...

Savings accounts earn more interest and limit monthly transactions

While the checking account is many people's primary daily account, savings accounts can earn customers more in interest, though access to these funds is generally more limited. Customers can earn several percent interest in savings accounts compared to near-zero checking account rates.

Although credit unions offer many of the same services as traditional banks, they differ in that credit unions operate with not-for-profit status and are run by and for their members.

How banking works

To do big things, people often need more money. Banks jumpstart economic activity with loans paid back with interest, and when things are working well, both people and the bank make more money. Formed in the Middle Ages amid competing currencies in Italy, banks—from the Italian for bench, banco—helped stimulate that era's commercial revolution, a massive expansion in Mediterranean trade and development. Find out the ins and outs of banks in this quick explainer video.

For every $100 you deposit, your bank puts a few cents in the FDIC insurance fund

This is a result of the 1933 Banking Act that established the Federal Deposit Insurance Fund. The law sought to prevent bank runs like those that decimated the banking industry amid the Great Crash and subsequent major depression. Today, individual depositors are insured up to $250K at each bank where they have an account.

The Federal Reserve's decisions can impact your money

Car loans, mortgages, business investments—these and more can be drastically impacted by the adjustment of the Federal Reserve’s federal funds rate. Alternatively, savers can earn higher, low-risk yields on their savings when the Fed’s target rate is higher.

Experts recommend keeping one to two months' worth of expenses in checking

That amount allows you to pay your bills and avoid overdraft fees while ensuring you don't lose interest. Most checking accounts have a near-zero interest rate (0.07% APY on average) while high-yield savings could earn up to 4% as of 2026. Cash sitting in your checking account can mean a loss of hundreds of dollars.

Banks have increased small loan programs since 2018, upping competition for payday lenders

One of the reasons payday lending flourished for nearly two decades is that most banks charged high overdraft fees and didn't offer small loans. However, since 2018, banks have increased their small loan options. Supporters say this provides safer alternatives for consumers, as banks are subject to more regulatory measures and are less likely to allow consumers to keep rolling over loans.

Visualize the balance sheets of US banks

The US banking industry is the most profitable in the world, with loans and leases driving the lion’s share of those profits. In fact, at the end of 2022, 53% of all bank assets fell into the loan and lease category. This rich visualization makes sense of that and highlights how traditional banks operate in stark contrast from their not-for-profit credit union peers. See it here.

Congress banned banks from paying checking account interest for 80 years

Known as "Regulation Q," the act sought to stop bank competition for customers involving increasing interest rates in the 1930s. This competition led banks to make reckless investment decisions to pay higher interest rates. During the ban, banks competed by focusing on convenience (ATMs, branches), relying on fees, and building relationships.

Some banks derive half of their income from overdraft fees on checking accounts

The fees are incurred when a customer withdraws more money than is left in the account, typically around $35 per overdraft. One in 11 Americans pays more than $350 a year in such fees, generating tens of billions of dollars each year for banks..

Periodically, the Federal Open Market Committee decides whether to raise, hold, or lower the federal funds rate

The federal funds rate is the interest rate at which banks lend their excess funds through the Fed. This influences what banks are willing to pay consumers for their deposits in savings and CD accounts. Typically, the higher the federal funds rate, the higher the interest rates on CDs.

The Fed operates within the open market as a competitive bidder of interest rates

Because it’s viewed as a risk-free platform to earn interest, whatever rate it sets becomes the default benchmark. To maintain its target rate prescribed by the Federal Open Market Committee, the Fed has various tools it offers both commercial banks and home loan institutions.

The Federal Reserve can set interest rates below zero

Interest rates, the cost of borrowing money, are the primary tool the Federal Reserve uses to control inflation. During periods of deflation, setting interest rates below zero penalizes saving, encourages banks to lend more and moves more cash through the economy.

Certificates of deposit are low-risk savings tools that offer a stable way to grow your money over time.

While the Fed is involved in issuing new generations of cash, the way it adds to the money supply does not involve printers

The majority of money in circulation is credit, not cash. This credit, which acts similarly to direct deposit from employers, is added to bank accounts by the Federal Reserve. The Fed also employs tools like the federal funds rate and open market operations to expand or contract credit.

Credit card companies make money through interest, annual fees, and more

They also profit from interchange fees, the fee the retailer has to pay the credit card network in order to facilitate a transaction. The fee is typically between 1% and 3% of the transaction amount.

Bond yields are the returns investors earn from a bond's interest—and they're a key economic barometer.

'Floating rate' loans periodically adjust their interest rates in accordance with economic conditions

When the Federal Reserve began raising interest rates in 2022 to combat inflation, interest payments borrowers owed to private credit lenders increased accordingly. Private credit funds benefited as loan returns increased, making the asset class attractive to investors at the time.

If the US government paid off its debt, it could disrupt the entire bond market, as Treasury bonds are among the most common bonds for investors and the majority of the national debt is in bonds.

Payday loans typically have higher interest rates than cash advances

Cash advances and payday loans are both short-term loans that allow borrowers to access cash quickly. Payday loans are much shorter-term, often due in two weeks or by the borrower's next paycheck, and have much higher interest rates.

Read about the situations where a high-yield savings account doesn't make sense

While financial experts often recommend high-yield savings accounts, one expert argues that prioritizing adding more money to one doesn't make sense for someone who has a lot of high-interest debt or isn't taking advantage of their company's 401(k) match.

Treasury bonds, notes, and bills are critical vehicles for the federal government to raise money for public expenses and manage the national debt.

For everyday Americans, a relatively high national debt can lead to higher interest rates on financial products such as mortgages.

Raising interest rates can help control inflation

While controlling a complex and dynamic economy is difficult, interest rates—more specifically, the rate at which banks lend each other money overnight—are a powerful tool. Generally, raising the rate makes purchases more expensive and cools an overheated economy.

Certificates of deposit are investment vehicles that earn interest on a fixed sum of money over a set term

CDs come in varying term lengths, from three- or six-month commitments to decadelong terms. Typically, the longer the term, the higher the interest rate.

Investing in bonds comes with a few risks

Think: changes in interest rates that impact the bond’s value, or a bond issuer completely defaulting on a loan. There are steps investors can take to lower their initial and future risk when investing in the bond market, such as checking a company's bond rating before investing.

Not all companies with bank-sounding names are actually FDIC-insured banks

When purchasing a certificate of deposit, it's important to know if you are purchasing a “deposit” product issued by an FDIC-insured bank.

Find out ways to get lower rates on private loans, such as applying with a cosigner.

Before the modern banking system, most lending resembled private credit

Before the creation of the modern banking system, the majority of loans were negotiated directly between the lender and the borrower—effectively making them private credit transactions.

BankFind is a tool that helps you find current and former FDIC-insured banking institutions

The tool from the Federal Deposit Insurance Corporation (also known as the FDIC) allows users to search for these institutions by name, location, and more.

It’s an investment banker’s job to raise money for the bank’s clients

Investment bankers do this in a multitude of ways, such as selling securities, or acquiring other companies.

How the checking account has evolved into a platform of features rather than a product

The accounts act as an anchor for customer relationships that banks need to retain said customers. As fintech companies unbundle the checking account without technically being chartered banks, traditional banks face pressure to innovate the checking account experience.

Companies sometimes issue corporate bonds to raise capital

These bonds offer investors regular interest payments in addition to the return of the principal amount at maturity. They allow companies to raise capital without losing ownership.

No institution wields more power in US finance than the Federal Reserve, the central bank of the US—but opinion polls indicate that most Americans don't know what it does.

The private credit industry—which offers nonbank loans directly to businesses, particularly privately held midmarket companies—grew from a $250B asset class in 2010 to around $1.5T in early 2024.

Payday lenders usually require borrowers to post-date a check or provide access to an electronic bank account

If borrowers can't pay back the loan, they can be subject to overdraft fees from their bank and other fees from the payday lender—further exacerbating the debt borrowers face.

Since the 1990s, banks have sold some of the credit risk of their accounts to external investors, known as SRTs, or synthetic risk transfers

This means if the account defaults, the outside investors assume most of the risk in return for some regular payments, freeing up the bank's ledger. It is a form of insurance used by banks to allow them to free up capital. In 2024, nearly $100B worth of SRT notes were sold.

Explaining the collapse of Silicon Valley Bank

In March 2023, Silicon Valley Bank—the nation's 16th largest bank at the time—collapsed after a rapid run on its deposits. Among other factors, the bank had placed more than half of its investments into long-term bonds, leaving it without the necessary cash on hand as its clients, largely start ups, panicked and withdrew their money at the same time. This visualization lays out the timeline and impact of the collapse.

Investors collectively owned $28T in US Treasury securities as of 2025.

The shadow banking system is a group of intermediaries that operate outside of normal banking regulations

The nonbank financial intermediaries that make up the shadow banking system legally provide services that are similar to those of traditional commercial banks. Although the term isn't used as often as it once was, private credit firms are technically part of the shadow banking system, as are hedge funds, payday lenders, buy now, pay later companies, and more.

The US Government sells two types of savings bonds: EE bonds and I bonds

EE bonds have fixed interest rates that the buyer is informed of when they purchase the bond. I bonds, however, earn a rate that can change every six months. A comparative chart details the most significant differences between EE bonds and I bonds.

Near-universal banking masks a large underbanked shadow system

FDIC data indicates 128 million households have a checking account, the vast majority (96% in 2024). But more than 14% of households are underbanked, meaning they have accounts but also rely on nonbank services such as check cashing, payday loans, or prepaid cards.

The bond market is where bonds and other debt securities are traded

Bonds are fixed-income investments allowing individuals to lend a specific amount of money to a large entity, like a government or corporation, for a set amount of time in return for interest paid out over the life of the loan. The bond market is widely considered a key economic barometer.

Credit unions, explained

Proponents of credit unions often point to the fact they’re not-for-profit cooperatives instead of for-profit businesses as a key selling point. This explainer dives into what this looks like in action—instead of pocketing the profits from interest rates, credit unions reinvest that money into the products and services they offer. For customers, this tends to create a more personal and community-oriented experience.

Find out how airlines quietly became banks

Some experts suggest airlines lose money on every flight. This video dives into how airlines have leveraged their loyalty programs to make billions of dollars, effectively evolving into banks.

BNPL companies typically make money via merchant fees rather than interest

When a merchant partners with a buy now, pay later app, consumers are more likely to spend more money with that merchant—meaning that the merchant is willing to pay a small fee in exchange for the ability for customers to pay with buy now, pay later.

Use a CD rate calculator

This CD Rate Calculator allows you to determine your interest earnings and total savings balance at CD maturity. Enter your initial deposit, your interest rate, and your term length in months or years. Click here to use it.