What is Yield Curve Control(YCC)? Here is everything you need to know

5 min readMar 24, 2024


Yield Curve Control (YCC) is a monetary policy strategy employed by central banks to manage interest rates on government bonds with the objective of controlling the shape of the yield curve. This approach has become a topic of significant interest among economists, policymakers, and investors, particularly in light of its adoption by the Bank of Japan (BoJ) and its impact on the Japanese economy.

History of Yield Curve Control

The concept of yield curve control is not entirely new; it has historical precedents. For example, during World War II, the Federal Reserve maintained a cap on Treasury yields to help finance the war effort at low costs. However, the modern incarnation of YCC, particularly as a comprehensive policy tool designed to combat deflation and stimulate economic growth, was prominently adopted by the Bank of Japan in 2016.


During World War II, the Federal Reserve’s application of Yield Curve Control (YCC) was primarily aimed at stabilizing the U.S. economy and ensuring low-cost financing for the war effort. This early use of YCC, while not termed as such at the time, represents one of the most notable historical examples of a central bank directly influencing the shape of the yield curve to meet national economic and financial objectives. Here’s how the Federal Reserve applied YCC during this period:

YCC main Objectives

The primary objective of the Federal Reserve’s policy during World War II was to maintain low interest rates on government bonds to facilitate affordable borrowing costs for wartime financing. This was crucial for the U.S. government, which needed to fund military operations, infrastructure, and support for allies without excessively burdening the economy with high interest costs.

The Federal Reserve set explicit caps on the yields of government securities, including both short-term and long-term bonds. For example, the yield on Treasury bills was capped at 0.375%, while longer-term government bonds had their yields capped at 2.5%. By setting these caps, the Federal Reserve aimed to maintain a stable and low-cost environment for government borrowing.

Market Operations

To enforce these yield caps, the Federal Reserve engaged in open market operations, which involved buying and selling government securities to influence their prices and yields. If market forces threatened to push the yield on a government bond above the set cap, the Federal Reserve would purchase that bond, increasing its price and thereby lowering its yield. Conversely, to prevent yields from falling below the targets, the Federal Reserve could sell securities, although during the war, the emphasis was overwhelmingly on purchasing to maintain the caps.

Impact and Challenges

The policy effectively kept borrowing costs low for the U.S. government during the war, facilitating an enormous increase in government spending without leading to immediate spikes in interest rates. However, this approach also led to significant increases in the money supply and held potential inflationary pressures in check only because of wartime price controls and rationing.

After the war, the challenge became unwinding this policy without causing disruption in financial markets or unleashing pent-up inflationary pressures. The transition away from yield curve control after World War II was a delicate process, culminating in the Treasury-Federal Reserve Accord of 1951, which marked a return to a more independent monetary policy by the Federal Reserve, free from the obligation to monetize the federal debt at fixed interest rates.

Methodology and Mechanics

Yield Curve Control operates by setting target yields for specific maturities of government bonds, usually focusing on the short to medium-term end of the yield curve. Central banks then commit to buying or selling unlimited quantities of bonds to maintain these target yields, regardless of market demand.

The mechanics of YCC involve several steps:
1. Target Setting:
The central bank sets a specific target yield for a particular government bond maturity. For instance, a central bank might target a 0% yield on 10-year government bonds.
2. Market Operations: To maintain the target yield, the central bank engages in open market operations. If the market yield rises above the target, the central bank purchases bonds, increasing demand and pushing the yield back down. Conversely, if the yield falls below the target, it may sell bonds to raise the yield.
3. Signal of Policy Stance: By controlling the yield curve, the central bank sends a clear signal about its monetary policy stance, influencing long-term interest rates and expectations.

Example: The Bank of Japan’s Implementation

The Bank of Japan’s adoption of YCC in September 2016 serves as a prime example of this policy in action. Facing persistent deflation and sluggish economic growth, the BoJ set a target yield of approximately 0% for 10-year Japanese government bonds (JGBs). This policy was part of a broader suite of measures aimed at overcoming deflation and revitalizing the economy.

To achieve its target, the BoJ committed to unlimited purchases of 10-year JGBs at a fixed rate, effectively capping the yield. This unprecedented commitment was designed to control both short-term and long-term interest rates, encouraging borrowing, spending, and investment.

Impact on the Japanese Economy

The impact of YCC on the Japanese economy has been multifaceted. Initially, the policy helped stabilize interest rates and provided some stimulus to the economy by lowering borrowing costs for businesses and households. It also had a significant effect on the yield curve, flattening it and thus influencing a wide range of economic activities.

However, the long-term effects and challenges of YCC have become apparent over time. While it has contributed to some degree of economic stability, the policy has also faced criticism for distorting financial markets, limiting the functioning of the bond market, and potentially encouraging excessive risk-taking.

Moreover, the BoJ’s commitment to maintaining its YCC targets has led to substantial increases in its balance sheet, raising concerns about the sustainability of this policy over the long term, especially in the context of an aging population and high public debt levels.


Yield Curve Control represents a novel and powerful tool in the arsenal of central banks, particularly in combating deflation and stimulating economic growth. The Bank of Japan’s experience with YCC provides valuable insights into the benefits and limitations of this policy. As central banks worldwide navigate the complexities of modern monetary policy, the lessons learned from Japan’s implementation of YCC will undoubtedly continue to inform future policy decisions.