Quantitative easing and quantitative tightening explained

Quantitative easing, usually shortened to QE, is a policy in which a central bank creates reserves to buy large amounts of government bonds or other financial assets, lowering longer-term interest rates and easing financial conditions when its short-term policy rate cannot be cut further. Quantitative tightening, or QT, is the reverse: the central bank lets its holdings shrink, through maturing bonds that are not replaced or through outright sales, which withdraws reserves and tends to lift longer-term yields. Both change the size and composition of the central bank balance sheet, and both are now part of the standard toolkit of central bank policy.

In brief

• QE works through the balance sheet, not the policy rate: the bank buys assets and credits banks with reserves.
• Effects run through lower long-term yields, portfolio shifts toward riskier assets, and signals about future policy.
• QT reduces the balance sheet, either passively (letting bonds mature) or actively (selling).
• The scale, pace and side effects of both are debated, and official publications describe each bank’s approach.

Where QE comes from

Normally, a central bank steers the economy by moving a short-term interest rate. In a deep downturn the rate can approach its practical floor, leaving the bank unable to ease further with the usual tool. Central banks then looked to other channels. The Bank of Japan used large-scale purchases earlier; the Federal Reserve, the Bank of England and the European Central Bank expanded asset purchases after the global financial crisis and again in later episodes of stress. Each bank’s website describes its programs, including the objectives, the asset types and the legal basis.

How QE works mechanically

1. The central bank decides on purchases. The policy committee announces an amount, a pace or a set of eligible assets, such as government bonds and, in some programs, other securities.
2. It buys from the market. The bank purchases bonds from banks, dealers and other investors.
3. It pays with newly created reserves. The seller’s bank account is credited, and its bank’s reserve balance at the central bank rises. These reserves are a liability of the central bank.
4. The balance sheet expands. Assets (the bonds) and liabilities (bank reserves, and in some cases currency) rise together.

No physical cash is printed in the process. The money created is electronic reserve balances, which circulate within the banking system.

Why QE can lower borrowing costs

Several channels are usually cited by central banks and researchers.

Portfolio balance. Removing large amounts of safe assets from the market leaves investors holding more cash, and some seek similar or higher-yielding assets, pushing up those prices and lowering yields.

Duration. The central bank takes on long-dated bonds, reducing the amount of interest-rate risk the private sector holds. Investors then require less compensation for bearing it, which lowers term premiums.

Signaling. Purchases show commitment to keeping policy accommodative, lowering expectations for future short-term rates.

Market functioning. In stressed markets, purchases can restore liquidity so that prices reflect fundamentals again.

Bank lending. More reserves may support lending, although central banks and researchers disagree on how large this channel is; a bank’s willingness to lend depends on demand and capital, not only on reserves.

What QT is and how it happens

QT begins when the bank stops adding assets and allows the balance sheet to shrink. There are two ways:

• Passive runoff. Bonds mature and the central bank does not reinvest the proceeds, or reinvests only part of them. The government repays the bank, and reserves fall as payments are drawn from the banking system. This is the approach the Fed has described in its balance sheet plans.
• Active sales. The bank sells assets before they mature. This speeds up the process but can have a larger market effect, so banks that have used it usually describe the pace and communicate it carefully.

Central banks typically announce a framework in advance, including the pace, caps on monthly reductions and the conditions that would lead to a pause or adjustment. They also explain how they will judge when reserves are no longer abundant, because shrinking too far can strain funding markets. The Fed’s and the Bank of England’s websites describe their respective plans, and the ECB publishes the details of its holdings and reinvestment policy.

Who is affected

Banks and money markets. Reserves are the settlement asset of the banking system. As reserves fall in QT, short-term funding markets can tighten, and central banks watch indicators for signs of stress.

Governments. Central bank purchases lower financing costs for the government, which raises debate about the line between monetary and fiscal policy. QT shifts the burden of holding government bonds back to private investors.

Savers and asset owners. Lower yields during QE raise the prices of bonds and often other assets; the opposite pressures can emerge under QT.

The central bank itself. When yields rise, the value of its bond portfolio falls, and some central banks have reported losses or deferred assets when the interest they pay on reserves exceeds the income from their holdings. Governments and legislatures treat these arrangements differently, and the rules are set by law.

A worked illustration

Take a stylized bank balance sheet. A central bank buys 100 units of government bonds from investors. Assets: bonds rise by 100. Liabilities: reserves rise by 100. Commercial banks hold 100 more reserves, and investors hold 100 more deposits in place of bonds. Longer-term yields may fall slightly because there are fewer bonds left to hold.

In a later QT phase, 20 units of those bonds mature without reinvestment. The government pays 20 to the central bank, drawing down 20 of reserves in the banking system. The central bank’s assets and reserves both fall by 20. The numbers are invented to show direction only.

How to follow the balance sheet

Anyone tracking QE or QT can use a short list of official sources. Each central bank publishes its balance sheet on a regular schedule, and the policy statement after each meeting says whether purchases or runoff plans have changed. Minutes and speeches explain the reasoning, such as why a committee believes reserves remain ample or what conditions would prompt a slower pace. Reading the statement, the implementation note and the balance sheet release together gives a fuller picture than any one of them alone. Watch for changes in wording about reinvestment, caps, and the types of assets held.

Debates and criticism

Effectiveness. Studies generally find that QE lowered yields, but estimates of the size and persistence of the effects vary, and the effect on inflation and growth is harder to isolate.

Distribution. Lower rates and higher asset prices can benefit asset holders more than others. Central banks note that the alternative to easing may have been worse outcomes for employment.

Financial stability. Prolonged easing may encourage risk-taking. Supervisors and international bodies, including the Bank for International Settlements, discuss these risks in their reports on global financial conditions.

Exit. Large balance sheets complicate normalization, since the pace of QT must be set carefully to avoid disruption. Policymakers have discussed using the balance sheet and the policy rate as separate instruments, with the policy rate as the primary tool.

Common misconceptions

“QE is printing money to give to the public.” The central bank creates reserves to buy assets. The money goes to the sellers of those assets and into the banking system, not directly to households.

“QE is the same as a bailout.” Bond purchases may support market functioning, but they are conducted at market prices under a mandate, not as grants.

“QT is the opposite of rate hikes.” QT tightens conditions through the balance sheet. Central banks may use it alongside or independently of changes in the policy rate.

“The central bank can go bankrupt from losses.” A central bank issues its own currency liabilities. Losses can affect its reported capital and remittances to the treasury, but the implications differ from those for a private firm.

FAQ

Is QE the same as lowering interest rates?

No. Cutting the policy rate changes short-term borrowing costs directly. QE changes the supply of assets and reserves to influence longer-term yields, and is typically used when the policy rate is already very low.

Does QT automatically raise interest rates?

It tends to put upward pressure on longer-term yields, but the effect depends on the pace, market conditions and expectations. Central banks generally treat the policy rate as their main tool.

Who buys the bonds when the central bank stops?

Private investors, such as banks, pension funds, insurers and overseas buyers, must absorb the supply the central bank no longer purchases.

Where can I see a central bank’s balance sheet?

Each bank publishes it. The Fed releases a weekly statistical release, and the ECB and the Bank of England publish regular financial statements.

How do QE and QT relate to central bank independence?

Large asset programs raise questions about fiscal effects, which is why mandates, transparency and clear legal bases matter to the independence debate.