This page explains how each calculator on CalcGST.com computes outputs, which assumptions are used, and how results are rounded for display.
1) GST Calculator
Add GST (exclusive base amount)
GST Amount = Base Amount x GST Rate / 100
Final Amount = Base Amount + GST Amount
Remove GST (inclusive amount)
Base Amount = Final Amount / (1 + GST Rate / 100)
GST Amount = Final Amount - Base Amount
CGST and SGST split is shown as 50/50 of the total GST amount for intra-state representation.
2) EMI and Loan Calculators
EMI = [P x R x (1+R)^N] / [(1+R)^N - 1]
- P = principal amount
- R = monthly interest rate (annual rate / 12 / 100)
- N = number of monthly installments
Total repayment and total interest are then derived from EMI x N and subtraction from principal.
3) Salary Calculator
- Gross Salary = Basic + HRA + Other Allowances
- PF Deduction (display model) = 12% of Basic
- Total Deductions = PF + Professional Tax input
- Take Home = Gross Salary - Total Deductions
4) Income Tax Calculator
The tool compares configured old-vs-new regime slab logic currently implemented in the page script. It includes cess and deduction caps as coded.
Important: Tax outcomes depend on legal updates, exemptions, and taxpayer-specific facts. Use this output as guidance only and verify before filing.
5) Rounding and Display
- Some calculators display 2-decimal values for precision.
- Some summary outputs are rounded to nearest rupee for readability.
- Input validity checks prevent negative or empty critical values.
6) Update Policy
We review formulas and explanatory content periodically and update pages when major tax/compliance changes are confirmed. See also our Editorial Policy and Disclaimer.