QE and QT: the central bank balance sheet explained
How a central bank adds and drains money, and why it matters for rates and markets.
QE and QT: the central bank balance sheet explained
The lesson in plain words
The same lesson as the slides above, written out in full.
1. The balance sheet, in plain terms
Welcome. Before we touch any jargon, picture a central bank as holding a big ledger of what it owns and the money it has created. Today we will see how growing or shrinking that ledger quietly changes how much money moves through the whole economy.
- A central bank's balance sheet is simply the assets it holds and the money it has created.
- When it buys assets, the balance sheet grows and money flows into the system.
- When it lets assets roll off, the balance sheet shrinks and money flows out.
- The two policy names for this are QE and QT.
- Both work through the banking system, not by handing cash directly to people.
A quick note: This is financial education only, not financial advice. Any numbers here are illustrative, meant to build intuition, and are not guidance for any decision.
2. Quantitative easing: adding money
Let us start with easing. When a central bank wants to support the economy, it can buy bonds from the market, paying with newly created reserves. That fresh cash tends to nudge interest rates lower, which makes borrowing a little easier for households and businesses alike.
- Quantitative easing is when the central bank buys bonds from the market.
- Those purchases add fresh liquidity and lift the balance sheet.
- Strong demand for bonds pushes their prices up and their yields down.
- Lower yields tend to mean cheaper borrowing costs across the economy.
- It is often reached for when rates are already near zero and more support is wanted.
3. Quantitative tightening: draining money
Tightening is simply the reverse. Instead of buying, the central bank steps back and lets its bonds mature, or sells some, so money flows back to it. As that liquidity drains away, borrowing costs tend to firm up across the economy.
- Quantitative tightening is the mirror image of easing.
- The central bank lets bonds mature or sells them, so cash returns to it.
- This drains liquidity and shrinks the balance sheet.
- With less demand for bonds, their yields tend to drift higher.
- Higher yields tend to make borrowing more expensive over time.
4. How each tends to affect markets
So the two policies pull in opposite directions. Easing adds money and tends to loosen conditions, while tightening removes it and tends to tighten them. Neither is good or bad on its own; it really depends on what the economy needs at the time.
- QE tends to ease financial conditions; QT tends to tighten them.
- Easing lowers the cost of money and can be supportive for risk assets.
- Tightening can act as a headwind as liquidity becomes scarcer.
- The direction of the balance sheet is a gauge many investors watch.
- Effects are usually gradual and depend on the wider economic backdrop.
Is QE printing money? History and trade-offs
Quantitative easing (QE) is when a central bank creates new money electronically and uses it to buy bonds, mostly government bonds, from banks and investors. Quantitative tightening (QT) is the reverse: it lets those bonds mature, or sells them, and the money disappears again.
Is it printing money? Partly. The money is new, but it is created as bank reserves, not banknotes, and it is used to buy assets rather than handed out. It works by pushing bond prices up and yields down (see Bonds and Understanding yields), which makes borrowing cheaper across the economy.
The Bank of Japan used it in the early 2000s. After the 2008 crisis the US central bank, the Bank of England and later the European Central Bank all used it on a large scale, and again in 2020. QT followed from 2022 as inflation rose (see The role of central banks).
Is it good or bad? It can steady markets in a crisis and support lending when rates are already near zero. The costs: it can push up asset prices, which helps people who already own assets most, and it can be hard to unwind.
To see whether QE or QT is running now, check the central bank's latest statement. The US central bank publishes its balance sheet every week. You can watch how bonds, the dollar and gold closed beside your own chart with the Market Board Mentor.
Quick answers
What is quantitative easing in simple terms?
Quantitative easing, or QE, is when a central bank creates new money and uses it to buy bonds from banks and investors. The extra demand pushes bond yields down, which makes borrowing cheaper and adds money to the financial system. It is usually used when interest rates are already close to zero.
Is quantitative easing just printing money?
Partly. The money is newly created, but as electronic bank reserves rather than banknotes, and it is used to buy bonds rather than being handed to people. It can be reversed later through quantitative tightening, when the central bank lets the bonds mature and the money disappears.
What is quantitative tightening (QT)?
Quantitative tightening is the reverse of QE. The central bank lets the bonds it holds mature without replacing them, or sells some, so money flows back to it and its balance sheet shrinks. Bond yields tend to drift higher, which makes borrowing a little more expensive over time.
Is quantitative easing good or bad?
It is a trade-off. QE can steady markets in a crisis and support lending when rates cannot go lower. It can also inflate asset prices, which helps people who already own assets most, and it is hard to unwind smoothly. Whether it helps depends on the economy at the time.
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