Finance Calculator Methodology & Disclaimers

Not financial or tax advice

GST, salary, and income tax calculators on GetFixMyFile are illustrative educational tools. They use simplified assumptions and publicly documented rate structures. They do not replace advice from a chartered accountant, tax professional, or your employer's payroll team.

Rate updates

Tax slabs and GST rates change with government notifications. Slabs are labeled by financial year. Always verify on incometax.gov.in and cbic.gov.in before filing or invoicing.

Assumptions shown on each tool

• Salary calculator: default basic 40% of CTC, HRA 40% of basic, employer PF inside CTC, and monthly TDS from the FY 2025-26 tax estimate. EPF wage ceiling, ESOP, gratuity, LTA, and employer NPS are not included.
• Income tax: FY 2025-26 resident-individual estimate with standard deduction, section 87A, surcharge with marginal relief, and 4% cess. Capital-gains special rates, non-residents, and return filing are not included.
• GST: inclusive/exclusive modes with CGST+SGST or IGST split. Rates come from a versioned table reviewed against CBIC.

Versioned rate tables

Engineering maintains versioned GST and tax metadata under src/data/finance/. When rates change, follow the update runbook in the project ops docs, re-test calculators, and re-check disclaimers. Income-tax pages are public tools; a human legal/disclaimer sign-off is still required before treating the numbers as filing advice.