On August 11 and 12, the People's Bank of China (PBOC) conducted no 7-day reverse repo operations for two consecutive days. Combined with the maturity of existing operations, this resulted in net fund withdrawals of 46.5 billion yuan and 5 billion yuan respectively. On the evening of August 12, the PBOC pre-announced overnight reverse repo operations for August 14, 17, 18, and 19, with a daily operation cap of 600 billion yuan. The simultaneous halt of 7-day reverse repos and the pre-announced increase in overnight reverse repo operations have puzzled many market observers.

Understanding the Overnight Reverse Repo Normalization

As a new open market operation tool introduced by the PBOC in June, the overnight reverse repo allows for fund return the next day, catering to ultra-short-term liquidity needs. Currently, overnight repo transactions account for nearly 90% of the money market, offering a shorter and more precise match for institutional daily liquidity gaps compared to traditional 7-day reverse repos. The overnight reverse repo operations follow a "quantity-based, not price-based" approach, disclosing only the volume cap without revealing the interest rate. This signals a focus on "smoothing out peaks and valleys" in liquidity rather than signaling a rate cut. A notable feature of this operation is its timing in mid-August rather than at month-end. Retrospectively, since June's month-end operation, to July's covering the month-end and extending into early August, and now to this mid-month concentrated operation, the timing is expanding from month-end to the entire month. According to Dong Ximiao, Chief Economist at China Merchants Union, this marks the overnight reverse repo's transition from an "emergency tool" to a "normalized tool." The operation precisely hedges against the fund disturbances from mid-August's tax payment period and reserve requirement adjustments. As August 15 falls on a weekend, August 17 becomes the tax declaration deadline and reserve requirement date, creating significant short-term funding pressure. Ming Ming, Chief Economist at CITIC Securities, analyzes that the overnight reverse repo operations cover the day before the tax period and the T+2 settlement period, reflecting the policy intent to meet short-term fund needs. Zhang Xu, Fixed Income Chief Analyst at Everbright Securities, believes that market interest rate fluctuations typically increase around the tax period. Traditionally, the 7-day OMO product has been used to hedge against the impact of tax periods, but it doesn't match the characteristics of spontaneous changes in the banking system's liquidity. The overnight reverse repo operations from August 14 to 19 can more precisely hedge against the impact of tax payments, reducing the volatility of DR001. Regarding the operation scale, the PBOC adopts a flexible model of "no more than 600 billion yuan per day" rather than a fixed daily amount. Zhang Xu analyzes that the specific dates of tax payments by market entities are highly subjective, making the impact of tax factors on banking system liquidity unpredictable. This flexible arrangement maintains monetary policy flexibility for precise adjustment. Dong Ximiao adds that the transparent pre-announcement allows large banks to allocate funds in advance and control lending pace, stabilizing market expectations and smoothing interest rate fluctuations before the operations are executed. The frequency of overnight reverse repo operations is accelerating. Wang Qing, Chief Macro Analyst at Dongfang Jincheng, predicts that the PBOC will conduct overnight reverse repo operations at the end of August, indicating that the frequency of operations in August will increase further from July's four operations, helping to reduce the volatility of DR001.

Zero 7-Day Reverse Repo Operations

In addition to the pre-announced overnight reverse repo operations, the PBOC's zero 7-day reverse repo operations for two consecutive days have also drawn market attention. On August 12, the PBOC's 7-day reverse repo amount was zero for the fourth time this year and the fifth time since the 7-day reverse repo shifted to a fixed-rate, quantity-based bidding mechanism. Since early August, the funding environment has been relatively loose, with market rates like DR001 and DR007 trending downward. The official announcement clearly states that the zero operations over the past two days are due to "the demand from primary dealers in open market operations." Market analysts believe this directly reflects the ample short-term interbank funds, with primary dealers' willingness to borrow short-term funds from the central bank weakening significantly. Historically, the PBOC's zero 7-day reverse repo operations occurred on five occasions: August 7, 2024; June 3, 2026; June 4, 2026; and August 11 and 12 of this year. Tan Yiming, Fixed Income Chief Analyst at TF Securities, believes these operations share a similar background, occurring after the 7-day reverse repo shifted to a quantity-based bidding mechanism and during periods of relatively ample liquidity. Essentially, this is a natural result of the market's reduced demand for short-term liquidity. The low-volume operations did not immediately trigger a tightening of funding. At the close on August 11, DR001 stood at 1.3602% and DR007 at 1.3925%. By the close on August 12, DR001 was at 1.3707% and DR007 at 1.3959%, with both key funding rates operating near or below the 1.4% 7-day reverse repo operation rate, indicating ample short-term liquidity in the banking system. Liu Yu, Chief Economist at Industrial Securities, believes the underlying logic of the central bank's return to zero operations may be to curb the unilateral downward expectations in the bond market, carrying a stronger policy signal.

Accelerated Shift to Price-Based Monetary Policy

The suspension of 7-day reverse repo operations for two consecutive days, coupled with the pre-announcement of overnight reverse repo operations, appears contradictory but is actually a combination of the PBOC's refined and forward-looking liquidity management. The overnight reverse repo tool is playing an increasingly important role in liquidity management. "When judging the monetary policy stance, attention should focus on the trend of DR001 over a period rather than the OMO amount or net amount," says Zhang Xu. He believes the recent zero 7-day reverse repo operations and the mid-August overnight reverse repo arrangements are not contradictory, both aimed at reducing the volatility of DR001. Ming Ming suggests that the operation period covers the 6-month buyout reverse repo operation time. Combined with the terms of the overnight and buyout reverse repos, they address short-term and long-term liquidity gaps from the tax period and reserve requirement days, reflecting precise liquidity management. Wang Qing believes this means market rate operations will be smoother in the future and may also indicate that the overnight reverse repo could gradually replace the 7-day reverse repo as the core policy tool for short-term liquidity adjustment by the central bank. "Zero operations" do not signify a change in the monetary policy stance. Tan Yiming believes that the current "zero operations" may be more inclined towards a "smoothing" nature: large net withdrawals from 7-day reverse repos at the beginning of the month are not uncommon. The current funding environment is dominated by seasonal easing, supporting the emergence of zero operations. At subsequent points like the tax period and government bond peaks, the central bank tends to conduct large-scale operations. This August, 3-month buyout reverse repos continued to increase, with a net injection of 200 billion yuan, matching last month's high, indicating the central bank's supportive stance remains unchanged. This operation is also a significant signal of the PBOC's monetary policy framework transitioning to a price-based model. "As the monetary policy framework further shifts to price-based, attention should be weakened on the volume of single operations. Instead, the short-term market rate level is a more suitable observation indicator," says Tan Yiming. Wang Qing states that the PBOC is accelerating the shift of its monetary policy framework to a price-based model, but the policy stance of maintaining ample liquidity has not changed. The future trend of market rate operations is "more stable," with rate levels primarily following policy rate adjustments, and the impact of factors like tax settlement, government bond issuance, policy tool maturity, and bank month-end assessments is weakening.