CDI (Certificado de Depósito Interbancário) is the rate for overnight interbank loans. It tracks the Selic rate closely (typically Selic − 0.1% per year). Most fixed-income investments in Brazil are indexed to CDI.
CDB Yield Calculator (Brazil)
Simulate CDB returns net of income tax with the CDI-based regressive tax table.
How CDB returns and income tax work in Brazil.
CDB (Certificado de Depósito Bancário) is a fixed-income investment issued by banks. Returns are indexed to a percentage of the CDI rate. Income tax applies using a regressive table: 22.5% for up to 6 months, 20% for 6–12 months, 17.5% for 12–24 months, and 15% for over 24 months. Tax is withheld at redemption. CDBs are FGC-guaranteed up to R$250,000 per institution.
Simulate your CDB net return at any CDI percentage.
- Enter the principal, term in months, and the current CDI rate.
- Enter the CDB percentage of CDI offered by the bank (e.g., 110% means 10% above CDI).
- Compare gross and net returns to find the optimal term.
Sources and references for this tool
These references help contextualize formulas, standards, APIs and limitations used on this page. They do not replace professional validation when a result has legal, financial, medical or operational impact.