What Is Quantitative Easing (QE)? How It Works
By Markets & Investing DeskUpdated Nov 10, 2026
Definition
Quantitative easing is a monetary policy in which a central bank creates new reserves to buy large amounts of assets, usually long-term government bonds, to lower long-term rates.
Key takeaways
- QE targets a quantity of asset purchases, while a conventional rate cut targets the overnight interest rate.
- The Fed pays for bonds by crediting banks' reserve accounts and buys through dealers, not from the Treasury.
- Inflation can lag a rise in the money supply by roughly 12 to 18 months, so problems may appear late.
- By 2017, U.S. bank reserves topped $4 trillion, with about $2.8 trillion held as excess reserves.
Quantitative easing (QE) is a monetary policy in which a central bank creates new reserves and uses them to buy large amounts of financial assets, usually long-term government bonds and sometimes mortgage-backed securities, corporate debt or equities. The goal is to push down longer-term interest rates and add liquidity to the financial system when the usual tool, cutting the short-term policy rate, has little or no room left because that rate is already near zero.
The name describes the method. A conventional rate cut targets a price: the overnight interest rate. QE targets a quantity: a stated amount of asset purchases, such as a set number of billions per month or a total program size. “Easing” means loosening financial conditions, the same direction as a rate cut, reached by a different route.
How Quantitative Easing Works
The mechanics of a purchase
A central bank does not need existing cash to run QE. It pays for the assets it buys by crediting the reserve accounts that commercial banks hold with it, creating those reserves electronically. In the United States, the Fed buys Treasury securities and agency mortgage-backed securities in the open market through dealers rather than directly from the Treasury. The government receives nothing from the transaction itself. The bonds were already issued, and QE changes who holds them.
Each purchase changes two balance sheets:
- The central bank gains an asset (the bond) and a matching liability (the new reserves owed to the selling bank).
- The commercial bank, or the bank acting for the investor who sold, swaps one asset for another. It holds fewer bonds and more reserves.
The total size of the bank’s balance sheet may not change at all. What changes is its composition. Reserves are the most liquid asset a bank can hold, so the banking system ends up with more liquidity and fewer long-dated securities.
Hypothetical worked example
Assume a bond pays a fixed $30 a year on a $1,000 face value. Before QE it trades at $1,000, so its current yield is $30 ÷ $1,000 = 3.0%.
The central bank announces it will buy $100 billion of similar bonds over the next year. A large, persistent buyer pushes prices up. If the bond’s price rises to $1,050, its current yield falls to $30 ÷ $1,050 ≈ 2.86%. The coupon stayed the same, and the higher price lowered the return a new buyer earns.
Because bond prices and yields move in opposite directions, buying bonds at scale pulls down yields on the targeted maturities. Those yields serve as benchmarks for mortgages, corporate bonds and other long-term borrowing, so the effect spreads beyond government debt.
How QE reaches the economy
Economists usually describe several channels:
- Lower long-term rates. Cheaper mortgages and business loans can encourage borrowing, home buying and investment.
- Portfolio rebalancing. Investors who sold bonds to the central bank now hold cash earning little. Some move into corporate bonds, stocks or other riskier assets, raising their prices and lowering financing costs for companies.
- Bank liquidity. Banks hold more reserves and fewer bonds, which can make it easier for them to extend credit.
- Signaling. A large purchase program tells markets the central bank intends to keep policy loose for a long time, which can hold down rate expectations.
- Exchange rate. Lower yields can make the currency less attractive to foreign investors, which tends to weaken it and make exports cheaper.
Why Central Banks Use QE
The policy rate cannot be cut much below zero. When it is already there and the economy is still contracting, or prices risk falling (deflation), QE lets a central bank act directly on long-term rates and on the liquidity in the system.
QE is separate from fiscal policy. In the United States the Treasury and Congress control spending and taxation, while the Fed controls monetary policy. In practice the two often run at the same time during a crisis. Large government borrowing and central bank bond buying can overlap, which is why critics sometimes say QE eases the financing of deficits.
Is Quantitative Easing Printing Money?
Partly, and the distinction matters. QE does create new central bank money, but in the form of bank reserves, not paper currency handed to households. Reserves stay within the banking system. They turn into spending in the wider economy only if banks lend more, or if asset sellers spend or reinvest the proceeds.
Critics argue that the outcome is still money creation and point to historical episodes where printing money to fund governments led to hyperinflation. Supporters answer that banks sit between the central bank and the public as intermediaries, and that the central bank can reverse the purchases later. They see this as a much lower risk of runaway inflation than directly financing government spending.
QE Compared With Similar Terms
| Term | What it means | How it differs from QE |
|---|---|---|
| Conventional rate cut | Lowering the short-term policy rate | Targets a price, not a quantity of assets; usually comes before QE |
| Routine open market operations | Buying or selling short-term securities to keep the policy rate on target | Small and technical; QE is large and aimed at long-term rates |
| Fiscal stimulus | Government spending or tax cuts | Run by the government, not the central bank |
| Qualitative easing | Shifting the central bank’s holdings toward riskier or less liquid assets | Changes the mix of assets rather than the total size |
| Tapering | Slowing the pace of new QE purchases | The balance sheet still grows, only more slowly |
| Quantitative tightening (QT) | Shrinking the balance sheet by selling assets or letting them mature without reinvesting | The reverse of QE |
| Treasury bond buyback | The government repurchasing its own debt | Reduces debt outstanding; under QE the bonds stay outstanding, held by the central bank |
Under QE the government does not buy bonds at a discount. The central bank does the buying, and it pays market prices, which its own demand tends to push higher.
Does Quantitative Easing Work?
The evidence is mixed. Many economists credit the Fed’s QE with helping stabilize the U.S. and global economies after the 2007-2008 financial crisis. QE clearly lowers interest rates and tends to lift stock and bond prices. Its broader effect on output and jobs is much harder to separate from everything else going on, such as fiscal policy, bank repairs and the normal recovery after a recession.
QE also has distributional effects. A former economist at the Federal Reserve Bank of St. Louis observed that it tends to favor borrowers over savers and people who own financial assets over those who do not. Lower yields reduce the income savers earn, while higher asset prices increase the wealth of those already holding stocks and bonds.
Risks and Limitations
Inflation
Adding money to the system raises the risk of inflation, and monetary policy acts with a delay. Inflation can lag a rise in the money supply by roughly 12 to 18 months, so problems may show up long after purchases begin. If QE fails to boost growth but still pushes up prices, the result can be stagflation: high inflation combined with high unemployment.
Limited lending
A central bank can fill banks with reserves, but it cannot force them to lend or force households and businesses to borrow. When the outlook is uncertain, banks may hold the extra liquidity and companies may hoard cash, so credit does not expand as intended.
Weaker currency
A larger money supply can weaken the domestic currency. That helps exporters, but imports cost more, which raises production costs and consumer prices.
Exit difficulty
Purchases that took years to make cannot be reversed quickly without disturbing markets. Ending QE means tapering first and then, possibly, quantitative tightening, and both can push yields up.
Quantitative Easing in Practice
United States
To fight the Great Recession, the Fed ran QE from 2009 to 2014, buying Treasury bonds, mortgage-backed securities and other assets, which greatly expanded its balance sheet. By 2017, U.S. bank reserves exceeded $4 trillion. Banks held about $2.8 trillion of that as excess reserves rather than lending it out, an outcome the program had not anticipated.
In March 2020, as the COVID-19 shutdown hit markets, the Fed announced $700 billion of asset purchases as an emergency measure and then expanded its buying aggressively. After inflation rose in 2021, the Fed reversed course in 2022 with large interest rate increases and a reduction of its asset holdings.
Japan
Japan fell into recession after the 1997 Asian financial crisis. The Bank of Japan used QE heavily to fight deflation and gradually widened its purchases from government bonds to private debt and stocks. The results looked temporary. Japan’s GDP in current U.S. dollars rose from $4.1 trillion in 1998 to $6.27 trillion in 2012, then fell back to $4.44 trillion by 2015. Dollar figures also reflect yen exchange rate swings, which QE itself can influence.
Switzerland
The Swiss National Bank expanded its balance sheet after the 2008 crisis until its assets exceeded the country’s entire annual economic output. The economy grew afterward, but how much of that growth came from the SNB’s purchases is unclear.
United Kingdom
In August 2016, after the Brexit vote, the Bank of England announced a program to buy £60 billion of government bonds and £10 billion of corporate debt. The aim was to keep interest rates from rising and support investment and employment. Official statistics later showed business investment growing at a compound average quarterly rate of 0.2% over the previous decade. Excluding the downturn, the rate was 0.8%, compared with 0.6% in the decade before it. U.K. economists could not determine whether that growth would have happened without QE.
The Bottom Line
QE matters to borrowers, savers and investors because it lowers long-term rates and tends to lift stock and bond prices. It tends to favor borrowers and asset owners over savers and people without financial assets. Its effect on output and jobs remains hard to measure, and the policy carries risks of inflation, a weaker currency and a difficult exit.
