Official Sources 2026
Official source manifest for RupeeCalc calculators and finance pages, reviewed in May 2026.
Official-source manifest
It helps future updates avoid hallucinated tax, GST, RBI, labour, or Google Search claims.
| Category | Official source | Use |
|---|---|---|
| Income tax slabs / regime choice Income Tax Department — Salaried Individuals for AY 2026-27 | Open official source | FY 2025-26 / AY 2026-27 tax-slab assumptions, default new regime note, senior citizen slab cross-check, 87A/cess notes. Use for salaried/non-business cases. Business/profession users must separately verify Form 10-IEA and regime-switch rules. |
| Income tax business/profession rules Income Tax Department — Individual having income from business/profession for AY 2026-27 | Open official source | Business/profession regime-switch caution and surcharge/marginal relief cross-checks. Do not apply salaried-only switching simplifications to business/profession cases. |
| Income Tax Department guidance transition watch Income Tax Department — Objective and scope of the Income-tax Act, 2025 | Open official source | 2026+ update watch and source verification when FY 2026-27 content is added. Existing calculator pages labelled FY 2025-26 / AY 2026-27 should not silently become FY 2026-27 pages without fresh verification. |
| GST rates and classification CBIC — GST goods and services rates | Open official source | GST add/remove formula source context and GST-rate/classification verification links. GST calculator does arithmetic only. HSN/SAC classification and rate must be verified from CBIC/GST Council/current notifications. |
| GST Council updates GST Council — GST rates | Open official source | Cross-checking rate categories and changes after GST Council meetings. Use alongside CBIC notifications before publishing rate-specific claims. |
| Loan rate resets / borrower rights RBI — FAQs on reset of floating interest rate on EMI-based personal loans | Open official source | EMI prepayment/reset caveats and consumer-rights notes. Calculator does not fetch live lender rates. Users must verify exact rate/spread/charges with lender. |
| Interest rate methodology RBI — Master Circular / interest rates on advances | Open official source | Lending-rate source context; not used as a live rate feed. Do not claim EMI as an RBI-branded standard; EMI uses a standard reducing-balance amortisation formula. |
| Gratuity formula Ministry of Labour & Employment — Payment of Gratuity Act, 1972 | Open official source | Five-year rule, 15 days' wages, monthly wage divided by 26 and multiplied by 15, and eligibility caveats. Some 2026 labour-code transition details require fresh verification before giving legal advice. |
| 2026 labour-code transition Ministry of Labour & Employment — FAQs on Labour Codes, 2026 | Open official source | 2026 gratuity/labour-code transition caution and current maximum gratuity reference. Use as a caution/update source; do not overstate applicability to every employment case. |
| EPF reference EPFO — Official updates and circulars | Open official source | EPF/PF source links in glossary and future salary calculators. Do not publish PF rate pages unless the exact circular/year is verified. |
Update rule for 2026 and beyond
When a claim cannot be verified from official or primary sources, RupeeCalc should either remove the claim, mark it “Needs verification,” or phrase it as a user-specific assumption rather than a universal rule.
Why official-source pages matter for user trust
Generic finance answers are easy to find. RupeeCalc should compete by making assumptions visible, official-source references easy to verify, and calculator limitations clear.
For AY 2026-27 individual salary tax, RupeeCalc should refer to the Income Tax Department’s current AY 2026-27 guidance and section 115BAC references rather than making broad claims that confuse FY 2025-26 calculations with later law transitions.