How we calculate
Converts the CDI percentage into an annual and monthly rate, compounds it over the term, then deducts regressive income tax on the gross return.
Formula used
The CDB's effective annual rate is the reference CDI times the contracted percentage. Tax applies only to the return, from 22.5% (up to 180 days) to 15% (over 720 days).
Rendimento líquido = Rendimento bruto − (Rendimento bruto × alíquota de IR regressivo)
Practical example
R$ 5,000 invested in a 100% CDI CDB for 12 months earns a gross return, taxed at the applicable regressive rate.
How to interpret the result
Always compare net (after-tax) returns between options.
Limitations
The CDI rate used is a reference value that may be outdated — check the reference date shown. Does not account for IOF or custody fees.