The Fed's balance sheet: quantitative easing and tightening explained
The Federal Reserve sets interest rates, but it also buys and sells trillions of dollars of bonds. Here is how its balance sheet works, why it grew so large and what shrinking it means.
Most coverage of the Federal Reserve focuses on one number: the federal funds rate. But since the 2008 financial crisis, the Fed has used a second major tool, its balance sheet. Buying bonds on a large scale is known as quantitative easing, or QE. Letting those holdings shrink is called quantitative tightening, or QT. Both affect interest rates, markets and, eventually, the cost of borrowing for households and businesses.
What is on the balance sheet
Like any balance sheet, the Fed's has assets and liabilities.
The main assets are securities the Fed holds, chiefly U.S. Treasury securities and mortgage-backed securities guaranteed by government-sponsored agencies such as Fannie Mae and Freddie Mac, along with loans it has made through its lending facilities.
The main liabilities are currency in circulation, the paper money in people's wallets, and reserves, which are deposits that banks hold in their accounts at the Federal Reserve. The Treasury's own account at the Fed, known as the Treasury General Account, and reverse repurchase agreements are also significant liabilities.
The Fed publishes its balance sheet every week in a statistical release known as H.4.1, "Factors Affecting Reserve Balances."
How QE works
In quantitative easing, the Fed buys large amounts of longer-term securities in the open market. It pays for them by crediting the reserve accounts of banks. So when the Fed buys bonds, both sides of its balance sheet grow: more securities on the asset side, more reserves on the liability side.
The goals are to lower longer-term interest rates and to ease financial conditions when the short-term policy rate is already near zero and cannot be cut much further. By buying large quantities of bonds, the Fed raises their prices and lowers their yields. Lower yields on Treasuries and mortgage-backed securities tend to feed through to lower rates on mortgages and corporate borrowing. QE also signals that the central bank intends to keep policy loose for a long time.
A short history
Before the 2008 crisis, the Fed's balance sheet was under $1 trillion. In response to the crisis, the Fed launched several rounds of asset purchases, and by late 2014 its total assets had grown to roughly $4.5 trillion.
From 2017 to 2019, the Fed gradually reduced its holdings by allowing some maturing securities to roll off without replacing them. That process ended in 2019, after strains in short-term funding markets that September.
When the pandemic hit in March 2020, the Fed resumed very large purchases of Treasuries and mortgage-backed securities. Its balance sheet peaked at nearly $9 trillion in 2022.
In June 2022, the Fed began a new round of quantitative tightening, setting monthly caps on how much of its maturing holdings would be allowed to run off. It later slowed the pace of runoff, and in October 2025 it announced that runoff would conclude on December 1, 2025. Check the latest H.4.1 release and the Federal Open Market Committee's most recent statements for current figures and plans, because the size and pace change over time.
How QT works
Quantitative tightening usually does not mean selling bonds. Instead, the Fed lets securities mature without reinvesting the proceeds, up to a monthly cap. When a Treasury security the Fed holds matures, the Treasury pays the Fed. If the Fed does not buy a new security to replace it, its holdings shrink, and reserves in the banking system tend to fall.
The effect is meant to be the mirror image of QE: modest upward pressure on longer-term interest rates and somewhat tighter financial conditions. Because QT happens gradually and in the background, the Fed has described the policy rate as its primary tool for adjusting the stance of monetary policy, with balance sheet reduction running alongside it.
Why the Fed cannot simply return to a small balance sheet
Before 2008, the Fed managed short-term interest rates by keeping reserves relatively scarce and adjusting them in small amounts. Today, the Fed operates what it calls an ample reserves framework. It controls its policy rate mainly through the interest rate it pays on reserve balances and through its overnight reverse repurchase facility, rather than by making reserves scarce.
In this framework, the banking system needs a comfortable level of reserves to function smoothly. If QT drains reserves too far, short-term funding markets can come under strain, as they did in September 2019. That is why the Fed has said it intends to slow and then stop runoff when reserves are somewhat above the level it judges to be ample.
Does the Fed make or lose money?
The Fed earns interest on its securities and pays interest on reserves and reverse repurchase agreements. When interest rates were low, it earned more than it paid and sent large remittances to the Treasury. When rates rose quickly in 2022 and 2023, its interest expenses rose above its income. The Fed records these shortfalls as a deferred asset rather than requesting funds from Congress, and it does not send remittances to the Treasury until the deferred asset is paid down. The Fed's losses do not affect its ability to conduct monetary policy.
What it means for you
- Mortgage rates follow longer-term yields, which the Fed's balance sheet policy can nudge, along with the 10-year Treasury, inflation expectations and the spread lenders charge.
- Savings and loan rates respond more directly to the Fed's policy rate.
- Markets watch QE and QT announcements closely, because they affect the supply of bonds that private investors must absorb.
The bottom line
The Fed's balance sheet became a major policy tool after 2008. QE expanded it to lower long-term rates when short-term rates were near zero. QT shrinks it gradually by letting bonds mature. Both run alongside interest-rate decisions, and both work mostly through longer-term interest rates that reach households and businesses over time.
This article is general information, not investment advice.