What is CDI and why it matters for your investments
The rate that benchmarks almost all fixed income in Brazil, explained in a few minutes.
CDI (Interbank Deposit Certificate) is the instrument Brazilian banks use to lend money to each other overnight. The average rate of those operations — the DI rate — became the main benchmark for fixed income in Brazil.
Why it moves with Selic
Banks trade these very short-term loans at a cost very close to the benchmark interest rate. That's why CDI usually sits a few hundredths below the Selic target.
Source: Banco Central do BrasilUpdated on Nov 5, 2026
What does "100% of CDI" mean?
When a bank CD promises 100% of CDI, it pays the same accumulated change of the DI rate over the period. A bond at 110% of CDI pays 10% more than that.
Do the math
Use the calculator with today's CDI to see how much a floating-rate investment may earn over the years.
Compound interest calculator
Final balance
R$125,302.74
- Total invested
- R$61,000.00
- R$1,000.00 upfront + 120 contributions of R$500.00
- Total interest
- R$64,302.74
- 51.32% of final balance
Equivalent monthly rate: 1.08%
Anyone who opens the link sees this same simulation. Nothing is stored.
Show year-by-year table
| Year | Total invested | Total interest | Final balance |
|---|---|---|---|
| 1 | 7,000 | 507 | 7,507 |
| 2 | 13,000 | 1,908 | 14,908 |
| 3 | 19,000 | 4,328 | 23,328 |
| 4 | 25,000 | 7,904 | 32,904 |
| 5 | 31,000 | 12,798 | 43,798 |
| 6 | 37,000 | 19,190 | 56,190 |
| 7 | 43,000 | 27,285 | 70,285 |
| 8 | 49,000 | 37,319 | 86,319 |
| 9 | 55,000 | 49,557 | 104,557 |
| 10 | 61,000 | 64,303 | 125,303 |
Contributions at the end of each month (the first one at the end of month 1). Yearly rate converted to the equivalent monthly rate. Taxes, fees and inflation are not considered: to compare investments after tax, use the fixed income calculator.