The taper tantrum refers to the sharp rise in Treasury yields during May-September 2013, triggered when Fed Chair Ben Bernanke testified that the Fed might begin reducing ("tapering") its monthly asset purchases under QE3.
The market impact was swift:
The episode unfolded across seven months with a series of distinct catalysts.
May 1, 2013. The 10Y Treasury yield stood at 1.63%, near its post-crisis floor. QE3 was running at $85 billion per month in combined Treasury and agency MBS purchases, and the market consensus assumed indefinite continuation.
May 22, 2013. Bernanke testified before the Joint Economic Committee and stated the FOMC "could" reduce the pace of purchases "in the next few meetings" if the economic outlook improved. Yields began moving immediately.
May 22 to June 25. The 10Y yield surged from 1.63% to approximately 2.50%, a +87 bp move in five weeks. No actual policy change had occurred.
June 19, 2013. The FOMC statement indicated tapering could begin later in 2013 if conditions warranted, and Bernanke's press conference reinforced the message. Selling accelerated.
September 5, 2013. The 10Y yield peaked near 2.98%, up +135 bps from the May 1 level.
September 18, 2013. The FOMC surprised markets by holding purchases unchanged. Yields fell back sharply, illustrating how sensitive the market had become to forward guidance.
December 18, 2013. Tapering finally began. The FOMC reduced monthly purchases by $10 billion, split evenly between Treasuries and MBS. Yields pushed to a final cycle high near 3.03% in late December.
The magnitude of the move puzzles analysts who focus only on the immediate policy change. Bernanke did not announce a rate hike, or even a reduction. He suggested a possible future slowing of purchases that had not yet occurred.
The explanation lies in the distinction between the "flow effect" and the "stock effect" of QE. The flow effect is the direct price support from ongoing monthly purchases. The stock effect is the cumulative reduction in duration supply available to private investors, which compresses yields and term premium on an ongoing basis.
Markets in mid-2013 had priced in indefinite QE continuation. The expected stock of Fed holdings was a function not just of current purchases but of all anticipated future purchases. When Bernanke signaled that future purchases would be lower than previously assumed, markets immediately repriced the entire expected path, not just the next month's flow. A single sentence of testimony caused a front-loaded adjustment to a multi-year expectation.
The term premium data from the ACM model confirms this interpretation. Term premium spiked sharply in mid-2013 as the market demanded higher compensation for duration risk in a world where the Fed was no longer an unconditional buyer. You can track current term premium estimates on the Levels page.
The taper tantrum was not confined to U.S. markets. As dollar yields rose, capital that had flowed into higher-yielding emerging markets reversed course. Portfolio managers sold EM local-currency bonds to capture the improved risk-adjusted return available in U.S. Treasuries.
The consequences were immediate and severe. The Indian rupee fell approximately 15% against the dollar between May and August 2013. The Turkish lira, Brazilian real, and Indonesian rupiah experienced similar pressure. Equity markets in these countries sold off in parallel.
The BIS and IMF subsequently published extensive research on the spillover mechanics, noting that the dollar-funding channel and investor risk appetite both amplified the transmission. The episode became a foundational case study in the global consequences of Fed communication, and it prompted emerging market central banks to build larger reserve buffers in subsequent years.
The taper tantrum forced a fundamental rethinking of how the Fed communicates balance sheet policy. Several principles emerged from the episode.
First, sequencing matters. The Fed subsequently established a clear framework: rate hikes would precede balance sheet reduction, and both would be communicated with substantial lead time. This sequencing was codified in the 2014 and 2015 policy normalization principles.
Second, the distinction between tapering and tightening must be made explicit. The 2013 confusion partly reflected markets treating a slower pace of purchases as equivalent to outright tightening. The Fed worked to separate the two concepts in subsequent communications.
Third, the 2022 quantitative tightening episode was noticeably more orderly than 2013. The Fed began telegraphing balance sheet reduction in late 2021, months before the first rate hike in March 2022. By the time QT began in June 2022 at 47.5 billion per month (rising to 95 billion by September), the market had already absorbed the announcement. The yield shock was driven primarily by inflation surprises, not communication failures.
The taper tantrum remains the canonical example of how forward guidance can move markets as forcefully as actual policy action.
What is the taper tantrum?
The taper tantrum is the name for the sharp rise in U.S. Treasury yields between May and September 2013, triggered by Fed Chair Bernanke signaling that QE3 asset purchases might slow. The 10Y yield rose from 1.63% to 2.98%, a move of approximately +135 bps, without any actual change in Fed policy.
Why did a hint of tapering cause such a large market move?
Markets had priced in indefinite QE continuation. When Bernanke signaled otherwise, investors repriced the entire expected future path of Fed bond-buying, not just the immediate change. The "stock effect" of QE, the cumulative compression of duration supply, unwound rapidly as expectations shifted.
Did the taper tantrum affect emerging markets?
Yes. Rising U.S. yields triggered capital outflows from emerging markets. The Indian rupee, Turkish lira, Brazilian real, and Indonesian rupiah all fell sharply. The episode is a standard reference case for studying Fed spillover effects on global capital flows.