> ## Content Index > Fetch the complete content index at: https://genesisbytes.com/llms.txt > Use this file to discover other available public pages before exploring further. # How Do Banks Really Work? Where Your Deposit Goes - URL: https://genesisbytes.com/guides-learn/how-do-banks-work/ - Published: 2026-09-30T01:00:26.000Z - Updated: 2026-09-30T01:00:26.000Z - Description: Your bank balance is not cash sitting in a vault. Learn how banks make money, why lending creates new deposits, how deposit insurance works, and what happens when a bank fails. - Author: Chipster - Tags: Guides Your balance shows a number on a screen, and most people quietly assume that number is a pile of cash waiting for them somewhere in a vault. It is not, and that surprise leads to the question almost everyone eventually asks: is my money actually there, and what happens if it isn't? The answer is more interesting than either the comforting version or the conspiracy version. This guide follows *What Is Money? The Evolution From Barter to Web3* and *What Is Inflation? Why Your Money Buys Less Every Year*. Now that we know what money is and why it loses value, it is time to meet the institutions that handle most of it. ## How Do Banks Work in Simple Terms? Banks take in **deposits**, which are legal claims on the bank rather than cash stored in a vault, and use them to make loans and buy assets. They earn money on the gap between the interest they charge borrowers and the interest they pay savers, plus fees. When a bank makes a loan, it also creates a matching new deposit. That last part is what most people have never been told, and we will come back to it. First, the word deposit itself is misleading. When you put money in, you do not hand over property for safekeeping like a coat at a cloakroom. You lend it to the bank, and the bank owes you the same amount on demand, so your balance is best understood as a promise, and the quality of that promise is what the rest of this guide is about. ## How Do Banks Make Money? The simplest source of profit is the spread. A bank pays savers a low interest rate, lends the money out at a higher one, and keeps the difference. Economists call the overall result the **net interest margin**, and in the second quarter of 2026 the average for US banks was 3.32%, according to the [FDIC's Quarterly Banking Profile](https://content.govdelivery.com/accounts/USFDIC/bulletins/426aa10?ref=genesisbytes.com). In plain terms, for every 100 dollars of interest earning assets, banks kept about 3.32 dollars a year after paying their funders. The second source is fees for accounts, cards, overdrafts and payment services, and the third is trading and other financial services, which rose in the same quarter as markets stayed volatile. This mix explains why banks care so much about your deposits: they are a cheap and stable source of funding, and the gap between what banks pay you and what they earn is the business. ## Do Banks Lend Out Your Deposits? There are two popular stories, and each one contains a piece of the truth. In the first, a bank collects deposits from savers and lends them to borrowers, like a middleman. In the second, banks create money out of thin air when they lend. The Bank of England explains in its paper [Money creation in the modern economy](https://www.bankofengland.co.uk/quarterly-bulletin/2014/q1/money-creation-in-the-modern-economy?ref=genesisbytes.com) that the second story is closer to how things work: lending creates deposits, and banks do not simply lend out deposits they already hold. Here is what that looks like in practice. When a bank approves a $200,000 mortgage, it does not hand over a bag of cash collected from other savers. It credits the borrower's account with a new $200,000 deposit and records the loan as an asset, so both sides of its books grow at once. When the borrower pays the seller, the money usually moves to another bank, which is why the lending bank still needs funding and liquidity to settle. This raises the question that confuses beginners the most: if the bank created the loan money, where does the interest come from? It comes from the wider economy, where the borrower earns income by working, selling or investing, and pays part of it back over time. The system works as long as enough loans are repaid, and that dependence on repayment is exactly why banks can fail. ## What Is Fractional Reserve Banking? **Fractional reserve banking** means that a bank holds only a fraction of its deposits as cash and reserves and puts the rest to work in loans and investments. In the classic textbook version, a bank keeps 10% and lends out the other 90%. That version is now outdated in the United States, because the Federal Reserve set reserve requirements to 0% in March 2020. The real limits today come from elsewhere. Basel III, the global rulebook, sets **capital requirements**: banks must hold core capital of at least 4.5% of their risk weighted assets, plus an extra buffer of 2.5%. Liquidity rules, supervisors and the simple fact that borrowers must want and repay the loans also restrain lending. Capital is the bank's own money, the cushion that absorbs losses before depositors are hurt. ## What Is a Bank Run? Because a bank keeps only a fraction of deposits in cash and liquid assets, it cannot pay everyone at once. A **bank run** happens when enough depositors fear a problem and rush to withdraw, and the fear itself can cause the collapse it predicts. In March 2023, Silicon Valley Bank, which held about $209 billion in assets, saw depositors pull out $42 billion in a single day, according to the FDIC, with another $100 billion lined up to leave the next morning. Mobile banking has made runs much faster than they used to be. ## Is Your Money Safe in a Bank? Mostly yes, thanks to **deposit insurance**, a government backed guarantee that repays depositors up to a limit if a bank fails. In the United States the FDIC covers $250,000 per depositor, per insured bank, per ownership category. In the United Kingdom the limit has been £120,000 per person, per authorised firm since 1 December 2025, and across the European Union it is €100,000 per depositor, per bank. Anything above those limits is not guaranteed, which is the detail many people miss. Failures do happen, and 2026 has already had more of them than 2024 and 2025 combined. The FDIC's latest report covers 4,238 insured institutions, and by late August five US banks had failed this year, compared with two in each of the previous two years. That matches the count of 2023, yet the latest failure, [a Philadelphia savings bank](https://www.bankingdive.com/news/tioga-franklin-philadelphia-fifth-bank-failure-2026-second-federal/828591/?ref=genesisbytes.com), held only about $68 million in assets. Its depositors automatically became customers of another bank, and their insured deposits stayed insured. ### What Happens If a Bank Fails? When a bank fails, the regulator closes it and the deposit insurer takes over as receiver. In most cases another bank agrees to take over the deposits, and customers find their accounts moved, often by the next business day, with insured balances untouched. If no buyer appears, the insurer pays insured depositors directly, usually within days. Deposits above the insurance limit may be recovered only partly and more slowly, which is why people with large balances often spread them across several banks. ## Why Did People Build Alternatives to Banks? Banks work because depositors trust that the promise on their balance will be kept, and in 2008 that trust cracked. Governments and central banks rescued many banks with public money, and in January 2009 the first Bitcoin block carried a newspaper headline about bank bailouts. Bitcoin was designed as money that does not depend on any bank, government or intermediary to keep its promise. The trade off is real, though. A bank offers convenience, deposit insurance and a place where salaries, cards and bills all connect, while crypto offers direct control and a different kind of trust. That control comes with risks: a lost password or seed phrase can mean lost money, prices swing widely, and many crypto products quietly reintroduce middlemen. Most people are not choosing a philosophy, they are choosing whether their payroll still lands and whether one mistake can ruin them. This article is educational and not financial advice. ## The Bottom Line A bank is not a vault. It is a lender that owes you money, earns from the gap between what it pays and what it charges, and creates new deposits every time it makes a loan. Your protection comes from capital rules, supervision and deposit insurance, all of which exist to keep a fragile promise reliable. Knowing where those limits sit, especially the insurance cap, is the most practical thing you can take from this guide. The banks are only one layer, though. Above them sit central banks, which set the price of money for the whole system, and that story starts with interest rates. Next up: interest rates and central banks. ### Frequently Asked Questions - **How do banks make money?** Mainly from the difference between the interest they charge on loans and the interest they pay on deposits, plus fees for accounts, cards and other services. - **What is fractional reserve banking?** It means a bank holds only a fraction of deposits as cash and reserves and lends or invests the rest. The old 10% textbook rule no longer applies in the US, where reserve requirements have been 0% since March 2020, so capital and liquidity rules do the limiting instead. - **Do banks create money?** Yes. When a bank makes a loan, it credits the borrower's account with a new deposit, which adds to the money supply. That money disappears again when the loan is repaid. - **Is my money safe in a bank?** Deposits are protected by insurance up to $250,000 in the US, £120,000 in the UK and €100,000 in the EU, per depositor per bank. Amounts above the limit are not guaranteed. - **What happens if a bank fails?** The regulator closes the bank, and a healthy bank usually takes over the deposits so customers keep access. If no buyer is found, the deposit insurer pays insured depositors directly.