Quantitative Easing Explained

By Ryan O'Connell, CFA, FRM Published October 20, 2026

Quantitative easing gives central banks a way to influence longer-term borrowing costs when conventional interest-rate cuts offer little room. In December 2008, the Federal Reserve set its federal funds target range at 0–0.25% as the economic outlook deteriorated. Large-scale securities purchases became another way to support financial conditions.^[1] Understanding those purchases requires separating three things: the assets the Fed acquires, the money created at settlement, and the economic effects that may follow.

What Is Quantitative Easing?

Quantitative easing (QE) is a policy of large-scale central-bank asset purchases intended to ease financial conditions, particularly through longer-term interest rates. The Fed’s major QE programs purchased Treasury securities and agency mortgage-backed securities. It pays for purchases by crediting reserve accounts at the Fed, expanding its assets and liabilities together.^[2]

The following video illustrates the purchases and their historical scale. For the wider channels connecting central-bank decisions to spending and employment, see monetary policy transmission mechanisms.

How QE Creates Reserves and Bank Deposits

Reserve balances are deposits that banks hold at the Federal Reserve. They are assets for the banks and liabilities for the Fed. A household’s deposit at a commercial bank is a different claim: an asset for the household and a liability for its bank.

The seller matters. If the Fed instead purchases a security already owned by a bank, that bank exchanges securities for reserves. The initial swap need not create a customer deposit. A purchase from a nonbank investor can create a deposit without any new bank loan.^[2]

Banks cannot lend reserve-account balances directly to households, which do not have reserve accounts. When a bank makes a loan, it creates a corresponding customer deposit. Lending depends on credit demand, borrower quality, profitability, capital, and other constraints; additional reserves do not produce a fixed multiple of loans.^[3] A bank can transfer reserves to another bank when making payments, but that transfer alone does not remove reserves from the banking system.^[4]

How QE Can Lower Long-Term Interest Rates

For given promised cash flows and maturity, a higher bond price means a lower yield. Central-bank purchases can therefore support prices and put downward pressure on yields. The bond pricing and yield-to-maturity relationship explains that arithmetic; QE’s effectiveness depends on how markets respond to the purchases.

Duration Risk and the Term Premium

Longer-term securities expose investors to interest-rate changes, measured through bond duration. When the Fed absorbs some of that exposure, private investors have less duration risk to hold. That can reduce the term premium, the yield component associated with bearing longer-term interest-rate risk.^[5]

Portfolio Rebalancing and Signaling

Investors receiving deposits may buy corporate bonds, equities, or other assets. This portfolio rebalancing can spread the effect beyond the securities purchased by the Fed. Investors can also retain deposits; reinvestment is a possible response, not an obligation.

Purchases may additionally reinforce expectations that monetary policy will remain accommodative. That signaling channel works through expectations of future short-term rates. It is distinct from removing duration risk, and its importance depends on the program and accompanying communication.^[6]

Evidence supports meaningful effects, with considerable uncertainty. Gagnon and coauthors’ 2010 New York Fed study estimated that the initial U.S. large-scale purchases reduced the ten-year term premium by 30–100 basis points, equivalent to 0.30–1.00 percentage point. This is an episode-specific estimate of the term premium, not a guaranteed yield reduction for every QE program.^[5]

QE in Practice: Financial Crisis and Pandemic

Japan adopted an early quantitative-easing framework in March 2001, switching its operating target from the overnight call rate to balances held at the Bank of Japan. That framework differed from the Fed’s later emphasis on large-scale purchases of longer-term securities.^[7]

The principal U.S. episodes illustrate how purchase programs can change in scale and purpose:

• QE1: On November 25, 2008, the Fed announced purchases of up to $100 billion in agency debt and $500 billion in agency MBS. It expanded the program in March 2009, including longer-term Treasury purchases. The initial announcement preceded the December move to the 0–0.25% policy-rate range.^[8]
• QE2: In November 2010, the Fed announced an additional $600 billion of longer-term Treasury purchases to be completed by the end of the second quarter of 2011.^[9]
• QE3: Agency MBS purchases began at $40 billion monthly in September 2012. After the maturity extension program ended, the Fed added $45 billion monthly in Treasury purchases, producing a combined pace of $40 billion + $45 billion = $85 billion per month.^[10]
• Pandemic purchases: In March 2020, the Fed initially announced at least $500 billion of Treasury purchases and $200 billion of agency MBS purchases. On March 23, it expanded purchases to the amounts needed to support market functioning and monetary-policy transmission.^[11]

How Large Did the Fed’s Balance Sheet Become?

The Fed’s H.4.1 releases report these figures in millions. For example, 8,965,487 million / 1,000,000 = 8.965487 trillion, rounded to $8.97 trillion. These are total assets held on particular dates, including assets beyond net QE purchases. They do not measure government spending, household deposits, or the financial cost of the programs.^[12]

QE, Money Creation, and Inflation

Calling QE money creation is reasonable if the kind of money is specified. Settlement creates electronic reserve balances, and purchases from nonbanks can also create customer deposits. Physical banknotes need not be printed for the purchase.

The monetary base equals currency in circulation plus reserve balances. M2 is a broader measure containing eligible bank deposits and other liquid money components; it excludes bank reserves.^[13][14] These distinctions are central to money supply and money creation.

The base and CPI series are not seasonally adjusted; M2 is seasonally adjusted. The historical observations come from Federal Reserve and Bureau of Labor Statistics data distributed by FRED.^[13][14][15]

The calculations are (4,075.0 / 847.6 − 1) × 100 = 380.8% for the base; (11,477.8 / 7,808.8 − 1) × 100 = 47.0% for M2; and (237.852 / 219.086 − 1) × 100 = 8.6% for CPI, rounded. The base became approximately 4.81 times its initial size. CPI’s 8.6% increase covers the entire six years, not a single year’s inflation.

This comparison demonstrates that reserves, broad money, and consumer prices did not grow proportionately. It does not identify what inflation would have been without QE. Inflation risk depends on spending relative to productive capacity, expectations, and other conditions. In August 2022, Chair Powell described that period’s high inflation as reflecting both strong demand and constrained supply; that assessment did not assign a numerical share to QE.^[16]

QE vs. Rate Cuts, Tapering, and QT

Separate the pace of purchases from the stock of assets held. In October 2014, the Fed ended its asset purchase program while continuing reinvestments and Treasury rollovers to maintain sizable holdings.^[17]

The Fed’s 2022 QT plan began runoff on June 1, 2022, primarily by limiting reinvestment rather than requiring active sales of the entire portfolio.^[18] The Committee subsequently ended reduction of aggregate securities holdings effective December 1, 2025.^[19]

Runoff requires attention to banks’ demand for reserves and conditions in money markets. Treasury-account balances, reverse repos, and other Fed liabilities also influence reserves, so portfolio contraction need not reduce reserves dollar-for-dollar over every interval. The Fed explained that its 2025 decision reflected reserves approaching ample levels. With ample reserves, administered interest rates allow short-term rate control without returning the balance sheet to its precrisis size.^[20]

Reserve-management purchases serve a different stated purpose from QE stimulus. In March 2026, SOMA Manager Roberto Perli explained that purchases introduced in December 2025 were intended to maintain ample reserves and interest-rate control. He distinguished them from longer-term purchase programs intended to ease overall financial conditions. Balance-sheet growth alone therefore does not establish that a new QE program is underway.^[21]

Risks and Limitations of Quantitative Easing

• Inflation risk: Accommodation can support spending when the economy has limited capacity to respond. Appropriate timing depends on economic conditions, not the reserve total alone.
• Risk-taking and market functioning: Lower yields may encourage imprudent investment choices. A central bank that becomes too dominant in a securities market can also impair liquidity and price discovery.^[6]
• Financial exposure and exit uncertainty: A large portfolio exposes the central bank to potential financial losses. Reducing holdings also requires judging uncertain and changing reserve needs.^[6][20]
• Uneven distribution: Asset-price gains benefit households according to their holdings. A Bank of England assessment of UK purchases also emphasized broader employment and output benefits relative to a deeper recession. Uneven wealth effects alone do not establish the policy’s total distributional outcome.^[22]

These tradeoffs belong within the wider limitations of monetary policy, rather than a claim that QE is either costless or ineffective.

How to Evaluate a QE Announcement

1. Identify the action. Distinguish net purchases, reinvestments, runoff, and reserve management. Keep monetary operations separate from government spending and tax decisions discussed in monetary and fiscal policy.
2. Read the assets and maturities. A program buying longer-term Treasuries or agency MBS has different objectives from purchases of short-term bills for reserve management.
3. Separate the announcement from settlement. Expectations can change before purchases occur; an announced ceiling is not a completed-purchase total.
4. Assess the surrounding economy. Market dysfunction, borrower demand, inflation pressures, and policy communication affect the likely outcome.

Common Mistakes About QE

• Equating reserves with household deposits. They are liabilities of different institutions and serve different holders.
• Requiring new loans before deposits can increase. A QE purchase from a nonbank can create a deposit at settlement.
• Treating total Fed assets as a spending bill. A balance sheet records assets held and how they are financed.
• Calling tapering QT. Slower positive net purchases still expand holdings.
• Attributing every market move to QE. Yield, asset-price, and inflation changes also reflect other news and economic forces.

Sources

Sources consulted October 20, 2026. Historical observations retain their stated dates; the $100 million transaction is hypothetical.

1. Federal Reserve Board, FOMC statement, December 16, 2008, policy-rate decision and balance-sheet measures.
2. Ihrig, Mize, and Weinbach, Federal Reserve Board, How does the Fed adjust its Securities Holdings and Who is Affected?, September 22, 2017, section 3.1 and Figures 3–4.
3. McLeay, Radia, and Thomas, Bank of England, Money creation in the modern economy, March 2014, pages 24–25. UK explanation of reserve and deposit accounting.
4. William R. Emmons, St. Louis Fed, Have Fed Asset Purchases Reshaped Bank Balance Sheets? Part 1, January 31, 2022, reserve-account settlement and aggregate reserves.
5. Gagnon, Raskin, Remache, and Sack, New York Fed Staff Report 441, Large-Scale Asset Purchases by the Federal Reserve: Did They Work?, March 2010, sections 2 and 5.
6. Ben S. Bernanke, Monetary Policy since the Onset of the Crisis, August 31, 2012, balance-sheet tools and cost-benefit framework.
7. Bank of Japan, New Procedures for Money Market Operations and Monetary Easing, March 19, 2001, policy actions (a)–(c).
8. Federal Reserve Board, agency purchase announcement, November 25, 2008, and FOMC statement, March 18, 2009.
9. Federal Reserve Board, FOMC statement, November 3, 2010, additional Treasury purchases.
10. Federal Reserve Board, FOMC statements of September 13, 2012 and December 12, 2012, agency MBS and Treasury purchase arrangements.
11. Federal Reserve Board, FOMC statements of March 15, 2020 and March 23, 2020, pandemic purchase decisions.
12. Federal Reserve Board, consolidated total-assets rows in H.4.1 releases dated August 9, 2007, January 8, 2015, April 14, 2022, and December 4, 2025. Peak context: Estenssoro and Kliesen, St. Louis Fed, The Mechanics of Fed Balance Sheet Normalization, August 23, 2023.
13. Federal Reserve Board via FRED, Monetary Base: Total, BOGMBASE, definition and August 2008/August 2014 observations.
14. Federal Reserve Board via FRED, M2, M2SL, definition and August 2008/August 2014 observations.
15. U.S. Bureau of Labor Statistics via FRED, Consumer Price Index for All Urban Consumers: All Items, CPIAUCNS, August 2008/August 2014 observations.
16. Jerome H. Powell, Monetary Policy and Price Stability, August 26, 2022, discussion of demand and supply.
17. Federal Reserve Board, FOMC statement, October 29, 2014, purchase-program conclusion and continued reinvestments.
18. Federal Reserve Board, Plans for Reducing the Size of the Federal Reserve’s Balance Sheet, May 4, 2022.
19. Federal Reserve Board, FOMC statement, October 29, 2025, runoff conclusion effective December 1.
20. Federal Reserve Board, Policy Normalization: Questions and Answers, updated December 12, 2025, ample reserves and balance-sheet reduction.
21. Roberto Perli, New York Fed, Reflections on the Early Days of Reserve Management Purchases and the Maintenance of Ample Reserves, March 26, 2026, introduction and closing discussion.
22. Bank of England, The distributional effects of asset purchases, Quarterly Bulletin 2012 Q3, summary and wealth-effects discussion.