Our Mathematical Methodology
eCalcy is built on the principle of "Open Logic." We don't believe in black-box calculations. Every number on our platform is derived from verifiable financial formulas and primary regulatory benchmarks.
01. The Core Engines
SIP & Wealth Compounding
Our SIP engine uses the standard Future Value (FV) formula of an Ordinary Annuity, adjusted for monthly compounding frequency:
*Where M is maturity, P is monthly investment, i is monthly interest rate, and n is number of months.
Loan Amortization (EMI)
EMI calculations are based on the reducing balance method, cross-verified against official bank amortization schedules:
02. Regulatory Alignment
We sync our tax and interest benchmarks directly with global fiscal bodies to ensure our calculators reflect current legislation.
Repo-rate linked EMI benchmarks and FD compounding rules.
Finance Act 2026 tax slabs, standard deductions, and 80C/80D logic.
Federal tax bracket inflation adjustments and standard deductions.
Historical mutual fund return benchmarks for realistic scenario planning.
03. Scenario Probabilities
Financial planning is rarely linear. Our "Decision Intelligence" layer adds secondary buffers to raw math:
Inflation Sensitivity: We allow users to adjust for the purchasing power of their future corpus.
Step-Up Capability: Modeling annual salary increments to reflect career progression.
Tax-Adjusted Returns: Calculating net post-tax maturity values based on LTCG/STCG rules.
Accuracy Disclosure
While our math is verified against institutional standards, calculations are based on user inputs. Market-linked returns (SIP/Lumpsum) are never guaranteed. eCalcy is an educational planning aid and not a financial advisory service. Always verify critical figures with a licensed professional before committing capital.