Sources · verification · gaps
Methodology and sources
The only defensible claim a young money site can make is that it shows its workings. So: here is every dataset behind the calculators, where it came from, when a human last read the source, and how often it has to be re-read.
Datasets
| Dataset | Source | Cadence | Last verified |
|---|---|---|---|
| Income-tax slabs, rebate, surcharge and cess — FY 2026-27 | Income-tax Act, 2025 and the Finance Act, 2026 | annual | |
| State professional-tax slabs and no-levy states | State professional-tax Acts and finance-department schedules | annual | |
| EPF, gratuity and Labour-Code wage-floor constants | EPF & MP Act 1952 (EPFO), Payment of Gratuity Act 1972, Code on Wages 2019 | annual |
The rules we encode
- Wages. Basic + DA at no less than 50% of remuneration (2026-27), per the Code on Wages, 2019, in force 21 November 2025.
- EPF. 12% employee and 12% employer on basic, with the statutory ₹15,000/month wage ceiling available as an option.
- Gratuity. Provided at 4.81% of basic — the annual equivalent of 15/26 of a month's basic per year of service.
- Professional tax. Derived from the state's own schedule, capped at ₹2,500 a year under Article 276(2). Deductible from taxable income under the old regime only.
- Income tax. Income-tax Act, 2025 (in force 1 April 2026; replaces the Income-tax Act, 1961). The Union Budget 2026 left the new-regime slabs, the Rs 75,000 standard deduction, the s.87A rebate, surcharge rates and cess unchanged from FY 2025-26.
- Rebate and relief. Section 87A, with marginal relief above the ₹12 lakh threshold, and marginal relief at every surcharge threshold.
What we have not encoded yet
We would rather show a gap than a guess. Professional tax is published for 14 of 36 states and union territories. These are still pending:
Punjab, Himachal Pradesh, Andhra Pradesh, Assam, Bihar, Chhattisgarh, Gujarat, Jharkhand, Kerala, Madhya Pradesh, Manipur, Meghalaya, Mizoram, Nagaland, Odisha, Sikkim, Tamil Nadu, Tripura, West Bengal, Puducherry, Dadra & Nagar Haveli and Daman & Diu, Lakshadweep.
- Salary income only. Capital gains, house-property income and business income are not modelled; special-rate income is excluded from the surcharge computation.
- Employer contributions to PF + NPS + superannuation exceeding Rs 7,50,000 in aggregate are taxable as a perquisite. Not modelled (binds only above roughly Rs 62 lakh of basic).
- Tax is rounded to the nearest rupee; s.288B rounding to the nearest Rs 10 is not applied.