Calculation Methodology & Formula Verification

1. Sourcing Official Statutory & Mathematical Formulas

We do not rely on unverified third-party blogs or secondary sources. Formulas are sourced strictly from:

• Financial Tools: Official regulatory bodies, central banks (e.g., RBI, Federal Reserve, Central Bank of Brazil), tax authority statutory publications (CBIC, IRS, Receita Federal), and peer-reviewed corporate finance textbooks.
• Health & Wellness: The World Health Organization (WHO), published peer-reviewed clinical literature (e.g., Mifflin-St Jeor, Devine, Robinson equations), and national health institutes.
• Engineering & Math: Standard ISO/NIST unit standards, textbook geometry formulas, and algorithmic standards (IEEE 754 precision math).

2. Automated Unit Testing & Edge Case Auditing

Prior to deployment, calculation engines are validated using automated test suites in Vitest. Tests check for:

• Extreme bounds (near-zero, negative, and astronomical values).
• Floating point rounding precision issues (e.g., avoiding classic binary representation errors like 0.1 + 0.2).
• Regulatory edge conditions (e.g., cap thresholds on Indian EPS pension contributions, Brazilian IR progressive deductions, GST slab updates).

3. Scheduled Verification & Change Tracking

Financial and tax rates (such as EPF interest rates, Selic/CDI benchmarks, and GST schedules) are decoupled into dedicated dataset registries and monitored for updates with every statutory budget release.

4. Independent Verification Encouragement

Every tool provides an explicit "Formula" and "Worked Example" breakdown. We encourage users to verify our formulas against their personal documentation or professional advisory.