The CDI is declining in step with Brazil's monetary-easing cycle
Recent dynamics
The annualized CDI rate remained at 14.90% through the opening months of 2026, reflecting the high level of short-term interest rates prevailing at the start of the year. The first decline occurred on March 19, when the rate moved to 14.65%.
Subsequent adjustments followed in a clear stepwise pattern. The CDI fell to 14.40% at the end of April, 14.15% in June, 13.90% in August, and 13.65% in September. These successive reductions closely mirrored the gradual decline in the Selic target over the same period.
From the beginning of 2026 through late September, the CDI declined by 1.25 percentage points. The movement indicates a meaningful reduction in the level of short-term interbank rates, although nominal interest rates remain high by historical standards.
Interpretation and economic signal
The CDI is associated with one-day interbank deposit transactions between financial institutions. The corresponding DI rate is calculated from these transactions and is quoted on an annualized 252-business-day basis, making it one of the principal short-term interest-rate benchmarks in Brazil.
Because the CDI operates at the very short end of the interest-rate market, it normally moves closely with the Selic. Changes in the policy rate are therefore transmitted rapidly to the CDI, which in turn influences a broad range of floating-rate instruments and financial contracts.
The decline observed during 2026 is therefore consistent with the broader process of monetary easing. Lower CDI rates reduce the benchmark return on many post-fixed fixed-income instruments and gradually lower the reference cost used in parts of the credit and capital markets.
Even so, a falling CDI does not by itself imply loose financial conditions. The absolute level of the rate remains elevated, and the effect on households, companies, and asset prices depends on the magnitude and persistence of the easing cycle as well as on credit spreads and inflation expectations.
Conclusion
The CDI has entered a clear downward phase after remaining near its cycle highs early in 2026. The reduction from 14.90% to 13.65% shows that the easing of monetary policy is already being transmitted to Brazil's core interbank funding benchmark.
The main signal is one of lower short-term rates rather than broadly accommodative financial conditions. Future changes in the CDI should continue to reflect the direction of the Selic and the evolution of short-term liquidity conditions in the Brazilian financial system.