Live · Income Tax Toolkit v4.2

Intelligent tools for the
modern tax professional.

We build precision instruments for India's tax professionals — starting with the Income Tax Toolkit that maps 569 sections from the old Act of 1961 to the new Act of 2025, with 192 Key Aspects, FY 2026-27 filing codes, and worked examples. Built with 18+ years of hands-on experience in tax consulting.

Stay current.

This toolkit reflects the IT Act 2025 (Finance Act 2026 amendments). As legislation evolves, we release new versions. Always download the latest copy from www.fasai.in before relying on it for compliance work.

569+
Section mappings
32
TDS / TCS calculations
28
Form mappings
FY 26-27
Ready for filing

Old Act to
New Act,
instantly.

A complete reference companion for the transition from Income Tax Act 1961 to Act 2025. Search, calculate, share — all in one place.

01

TDS/TCS Calculator

32 sections covered with FY 2026-27 filing codes. Search by section, code, or keyword. Instant calculation with new Act reference.

02

569 Section Mappings

Verified against the official Income Tax Department Navigator PDF — the authoritative source for IT Act 2025 mappings.

03

28 Form Mappings

Old Form 16, 26AS, 24Q — see what the new equivalents are under IT Act 2025.

04

Built for sharing

Copy or share calculations to WhatsApp and email. Clean, professional output every time.

05

Works offline

Download once, use anywhere — court hearings, client visits, audit sites. No internet needed. Download HTML

A growing suite of tools
for tax professionals.

We're building one tool at a time — slowly, deliberately, and with the input of practitioners. Here's what's live, what's coming, and what's on our minds.

Coming · 2026

GST Reckoner

Rate finder, HSN classifier, and ITC calculator for the unified GST regime. Built around the new rate structure.

Get notified →
In planning

Due Date Calendar

Personalised compliance calendar with TDS, GST, ROC, and Income Tax due dates. Reminders that actually matter.

Suggest a feature →

18+ years in the trenches.
Built by people who get it.

Fas AI is powered by Fas Consulters — a tax consultancy firm founded by three professionals after completing their CA Articleship. With over 18 years of combined experience in Indian tax consulting, we know the daily pain points of practitioners — and we're building tools to solve them.

A note of thanks.

This toolkit, like much of what we do, owes a quiet debt to CA M. Narayana Kumar — our articleship principal, our teacher, and our mentor for over 18 years — and he continues to guide us today. With over 35 years of professional standing, his unwavering support — through the early years of our tax consulting profession and through this initiative — means more to us than these words can convey.

Our special thanks to CA Jojin George, whose technical insight and design sensibility shaped this toolkit at every stage of its development. From early architecture to the inclusion of FY 2026-27 TDS filing codes — a feature that has become central to the tool — his suggestions have repeatedly pointed us toward what matters most for the practitioner. We are grateful for his time, his expertise, and his belief in this work.

Our special thanks also to CA Ramiz A K, whose careful eye and steady feedback accompanied this toolkit from its earliest drafts to its current form. He spotted issues we had missed, offered suggestions that made the tool sharper, and stayed engaged with the work throughout — the kind of attention only a friend can offer.

Tax updates, decoded.

Plain-language analysis of the new IT Act 2025, Finance Act 2026 amendments, and notifications that actually affect your practice.

01
IT Act 2025 · 5 min read

Sec 393 explained: How the new TDS regime works

A clean walkthrough of the consolidated TDS provisions under Sec 393 — why the renumbering, what changes for practitioners.

Read article →
02
TCS · 4 min read

TCS on luxury goods: The 10 items every CA should know

CBDT Notification 36/2025 brought watches, handbags, art, and 7 more luxury items under 206C(1F). Here's what changes.

Read article →
03
Practice · 6 min read

Trust sections in IT Act 2025: From 11-13 to 332-355

The RNPO regime renumbered charitable trust provisions completely. A side-by-side mapping of every change.

Read article →

Have a question?
A feature request?

We read every message. If you spot an inaccuracy in the toolkit, want a section added, or just want to say hello — we'd love to hear from you.

Working on something specific?

If you're a CA firm with custom tooling needs, an industry body looking for educational partnerships, or a fellow tool-builder in the tax space — we'd genuinely like to talk.

Drop us a line and we'll get back within 48 hours.