How Banks Create Money Out of Thin Air

When a bank approves your loan, it does not reach into a vault, or quietly move some other customer’s savings into your account. It creates the money on the spot. The balance simply appears, the moment you sign.

That sounds like a trick, but it is the plain mechanics of modern banking, and the people who run the system describe it exactly this way. The Bank of England, in a 2014 paper written for the express purpose of clearing this up, states it without hedging: whenever a bank makes a loan, it simultaneously creates a matching deposit in the borrower’s account, and in doing so it creates new money.

Money today is mostly deposits, not cash

Start with what “money” even is. When you picture the money supply, you might picture printed cash. But the vast majority of the money in the US is not paper at all. It is deposits: numbers sitting in bank accounts, plus a layer of cash and cash-like funds on top. The broad measure economists use for this, called M2, stood at roughly $22.8 trillion in April 2026, a record high. Only a small slice of that is physical currency. Most of it is account balances.

That matters, because if most money is account balances, then the interesting question is not “who prints the money.” It is “where do the account balances come from.” And the answer is the part most people have backwards.

A loan creates a deposit

Here is the reveal. The common belief is that a bank is a middleman: savers put money in, the bank lends that same money out to a borrower, and it pockets the difference. Money moves from saver to borrower.

It is the other way around. When a bank grants a loan, it writes two new entries at the same time. On one side, a new asset: the loan you now owe it. On the other side, a new liability: a new deposit in your account, money that did not exist a moment earlier. No saver’s balance fell to make room for it. The Bank of England says it directly: banks do not act simply as intermediaries, lending out deposits that savers place with them. The lending itself is what brings the deposit into being.

So the loan does not follow the money. The loan is the money being created.

The textbook model: the money multiplier

If you took an economics class, you learned a tidier story, and it is worth walking through because it is half right. It goes like this. A bank must keep a fraction of its deposits in reserve, say 10%, and may lend out the rest. So a $100 deposit lets the bank lend $90. That $90 gets spent and re-deposited at another bank, which keeps 10% and lends $81. And so on, each round smaller than the last.

Add up the whole chain and an initial $100 of reserves can support up to $1,000 of total deposits. That is $900 of new money on top of the original $100. The maximum is one divided by the reserve ratio: at a 10% ratio, ten times. This is the famous picture of “fractional reserve banking.”

It is a clean, intuitive model. It is also, according to the central bank that actually runs the system, not how money is really created.

Why the multiplier is not how it works

The Bank of England rejects the reserves-first version explicitly. Banks, it writes, do not multiply up central bank reserves into new loans and deposits. The causation in the textbook runs backwards. In reality, banks lend first, when they find a creditworthy borrower and a profitable loan, and the reserves to settle that lending are supplied afterward.

What actually limits how much a bank lends is not a reserve multiplier. It is three things working together: whether lending is profitable at the going interest rate, whether borrowers actually want loans, and the capital requirements regulators impose. The reserve ratio, in the modern system, is not the lever the textbook makes it out to be.

So keep the multiplier as a teaching model, the way you keep the simple atom diagram from school. It builds the intuition. It just is not the live mechanism.

US reserve requirements are now literally zero

Here is where the textbook fully parts ways with reality. As of 26 March 2020, the Federal Reserve set the reserve requirement ratio to 0%. Banks in the United States are no longer required to hold any fraction of their deposits in reserve.

Run that through the old formula and you get one divided by zero, which would imply an infinite multiplier and unlimited money. That conclusion is wrong, and it is worth being clear about why. A 0% requirement does not unleash infinite money creation. It means reserves were never the thing holding lending back in the first place. The real constraints, capital requirements, loan demand, and profitability, are still firmly in place. The brake did not disappear. It was just never the brake people thought it was.

The central bank still steers it

None of this means money creation is a free-for-all. The central bank still ultimately governs how much money gets created, mostly by setting the policy interest rate, which is the price of borrowing, and at times by buying assets directly. When borrowing is cheap, more loans get made and more money is created; when it is expensive, less. The banking system grows the money supply, but it does so inside a fence the central bank controls.

The numbers, dated

Money-supply figures move with every release, so each one below is labeled by its source and its date. M2 is the broad measure: account deposits plus currency and retail money-market funds, not just checking balances.

Figure	Value	Source
US M2 money supply (April 2026)	≈ $22.8 trillion, a record high	Federal Reserve H.6 / FRED M2SL
US M2 in 1970	$626.5 billion (about 36 times smaller)	FRED M2SL
M2 before COVID (February 2020)	$15.4 trillion	St. Louis Fed
M2 at its COVID-era peak (April 2022)	$21.7 trillion	St. Louis Fed
M2 surge, Feb 2020 to Apr 2022	≈ +41%	St. Louis Fed
US reserve requirement (since 26 Mar 2020)	0%	Federal Reserve
Textbook multiplier example	$100 reserves at a 10% ratio supports up to $1,000 deposits ($900 new)	Teaching model

The multiplier row is the schoolbook model, included so you can see the arithmetic, not an endorsement that this is how the $22.8 trillion got created.

Did it cause inflation?

It is tempting to draw a straight line from “banks create money” to “that is why prices rose.” Resist it, because this is contested ground. The roughly 41% jump in M2 between 2020 and 2022 did come right before the 2021 to 2023 inflation, and some economists link the two. But others put the weight on supply-chain breakdowns, energy prices, and reopening demand, and point out that the Fed had spent years treating M2 as a weak predictor of inflation. Both cases are serious. The honest summary is that economists genuinely disagree about how much of the inflation the money surge explains, and there is no settled answer.

So what?

Money is not a fixed pile that banks shuffle from savers to borrowers. Most of the money in the economy is created by commercial banks, the moment they make loans, as new deposits. Once you see that, the whole system reads differently. The money supply is not a quantity handed down from on high. It is something the banking system grows, loan by loan, inside limits the central bank sets, which is exactly why how much banks lend matters for everyone who holds dollars.