Open Reference Library
Verified reference guides, checklists, and research notes across contracts, tax, procurement, and compliance — sourced from Acts, Rules, and official notifications. Free to read.
Browse the Library by Topic
Every resource is verified from primary sources — Acts, Rules, judgments, and official government notifications.
Contracts & Claims
Reference guides for the Indian Contract Act, FIDIC, GCC, EOT, force majeure, and claims management in EPC projects.
Income Tax Reference
Deduction tables, TDS rate charts, advance tax schedules, ITR form selection guides — from the Income Tax Act and Finance Acts.
GST Reference
GSTR filing calendars, e-invoicing thresholds, ITC rules, and HSN/SAC rate schedules from CGST Act and CBIC notifications.
Procurement Reference
GFR 2017 rules, GeM Portal guidance, CVC guidelines, and public procurement checklists for government and PSU projects.
Business Compliance
MSME/Udyam registration guides, Companies Act compliance calendars, labour law summaries, and sectoral registration guides.
Checklists & Glossaries
Contract review checklists, compliance calendars, and plain-language glossaries for legal and commercial terms.
Guides in development — publishing soon.
Reference Guides — Coming Soon
Practical reference guides verified from Acts, Rules, and official circulars — indexed for quick lookup, not just reading.
EOT Claim Checklist: What FIDIC and GCC Require You to Prove
Reference guide in development — publishing soon.
TDS Rate Chart 2024-25: All Sections Under Income Tax Act
Reference guide in development — publishing soon.
GeM Portal Buyer Guide: Registration, Ordering, and Compliance
Reference guide in development — publishing soon.
GST Return Filing Calendar: All GTSRs and Due Dates 2024-25
Reference guide in development — publishing soon.
Force Majeure Under Indian Contract Act: What Courts Actually Decide
Reference guide in development — publishing soon.
GFR 2017: Key Rules Every Government Procurement Officer Must Know
Reference guide in development — publishing soon.
Free Calculators and Lookup Tools
Tools built from the same verified sources as the guides — no sign-up required.
Income Tax Calculator
Old vs New Regime comparison for FY 2024-25. Verified against Finance Act 2024.
HSN/SAC Code Finder
GST rates for any product or service using the CBIC tariff schedule. Search by keyword or browse by chapter.
All Calculators
Browse the full HaritaZen calculator library — tax, financial, and compliance tools.
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Knowledge Grounded in Primary Sources
Every guide and calculator in the HaritaZen library is verified from Acts, Rules, and official government notifications — not paraphrased from secondary sources.