⚠️ IMPORTANT LEGAL NOTICE
This tool does NOT have any association, link, or official endorsement with:
Federal, State, or Municipal Government
Brazilian Federal Revenue Service
Finance Departments
Tax Agencies
Government Entities
Tool Features:
Purpose: Exclusively informative and educational
Legal Basis: Current tax legislation
Responsibility: B20 Conteúdo Digital (private company)
Use: For study and information purposes only
SELIC Interest Calculator - Informative and Educational Tool
About the Tool
The SELIC Interest Calculator is a tool developed by B20 Conteúdo Digital with the sole purpose of providing educational and informative information on calculating interest and fines on overdue taxes. This application was created to help citizens, students, and professionals better understand the financial impacts of late tax payments. How It Works
The calculator uses the official SELIC rate published by the Central Bank of Brazil, combined with the fines and interest established in current tax legislation. Calculations are performed following the legal guidelines applicable to each type of tax. Sources of Legal Information
SELIC Rate
Source: Central Bank of Brazil (BACEN)
Official API: https://www.bcb.gov.br/api/servico/sitebcb/indicadorCambio
Update: Automatic via official API
Legal Basis: BACEN Monetary Policy
Fines and Interest
Legal Basis: Law 9,430/1996 (Tax Enforcement Law)
Regulation: Decree 3,000/1999 (Income Tax Regulation)
Installment Interest: 0.6% per month (Law 9,430/1996, Art. 40)
Fines by Tax Type:
IRPF/IRPJ: 20% (Law 9,430/1996)
ICMS/IPI: 75% (State and federal laws)
PIS/COFINS: 50% (Law 9,430/1996)
CSLL: 50% (Law 9,430/1996)
Interest Calculation
Methodology: Pro rata die (per day)
Calculation Basis: Principal Amount + Fines
Formula: Interest = (Principal Amount + Fines) × SELIC Rate × (Days Late ÷ 365)
Limitations and Responsibilities
This tool does NOT replace:
Professional accounting advice
Specialized legal advice
Official guidance from government agencies
Individual verification of specific cases
The user is responsible for:
Verifying the applicability of the calculations to their specific case
Consulting qualified professionals for legal issues
Confirming information with official sources when necessary
Recommended Use
Study and Education: Understanding the financial impacts of late payments
Planning: Estimates for personal financial planning
Information: Knowledge base on tax legislation
Comparison: Analysis of different tax scenarios Payment
Developer
B20 Digital Content
Website: https://www.b20.com.br
Purpose: Development of educational tools
Specialization: Informational and didactic applications
Final Note: This tool is regularly maintained and updated to reflect changes in legislation and the SELIC rate. For use in situations involving actual legal or tax obligations, always consult a qualified professional.