Yield Curve Control

What Is Yield Curve Control?

Yield Curve Control (YCC) is an unconventional monetary policy tool in which a central bank targets a specific yield level on a particular maturity of government bonds — and defends that target through open-ended bond purchases. Unlike QE, which targets a quantity of purchases, YCC targets a price (the yield).

How It Works

The central bank announces a yield ceiling (e.g. 0.5% on 10-year JGBs). If bond yields rise above that ceiling because of selling pressure, the central bank steps in to buy bonds until the yield falls back to or below the target. Because the commitment is theoretically unlimited, markets typically test the central bank's resolve and back down.

Japan's YCC Programme

The Bank of Japan introduced YCC in September 2016, targeting 0% on 10-year Japanese Government Bonds (JGBs). When global rates rose sharply in 2022–2023, the BoJ was forced to buy enormous quantities of JGBs to defend the cap, ultimately widening and then abandoning the policy in 2024. At peak, the BoJ owned over 50% of all outstanding JGBs.

Global Macro Implications

YCC in Japan has significant global effects:

• Currency suppression: Defending low domestic yields keeps the yen weak, benefiting Japanese exporters
• Capital flows: Japanese investors, starved of domestic yield, become major buyers of foreign bonds — the "carry trade" in reverse
• US Treasury demand: Changes to YCC affect Japanese demand for US Treasuries and can move global bond markets

Risks

• Balance sheet explosion: Unlimited purchases can cause the central bank's balance sheet to grow without limit
• Currency depreciation: YCC can cause rapid currency weakness if markets lose faith
• Exit difficulty: Unwinding YCC can cause sharp yield spikes, as seen when the BoJ finally allowed yields to rise