Trademark Applied · ONE HUNDRED™ · Expert-Supervised · ₹100 per Return · Zero Error Guarantee · Annual Billing at ₹2,400
Taxes Simplified

File GST
at ₹100
Per Return

Two returns. Zero errors. Expert-reviewed before every filing. GSTR-1 + GSTR-3B at ₹200/month — paid upfront annually at ₹2,400. India's most affordable professional GST compliance for MSMEs.

Start Filing for ₹2,400 / Year → 🚀 Try Live Demo See How It Works
₹100
Per Return
ZERO
Error Target
5-Level
AI Validation
24
Returns / Year
Core GST Plan
₹100
Per return / per month · 2 returns × ₹100 = ₹200/month
GSTR-1 Filing₹100 / month
GSTR-3B Filing₹100 / month
AI 5-Level ValidationIncluded
Expert ReviewIncluded
Client OTP ApprovalIncluded
Free Billing SoftwareIncluded — ₹0
Tally / Zoho IntegrationIncluded
Annual Upfront₹2,400
Enroll Now — ₹2,400 / Year 🚀 Try Live Demo First

The Problem We Solve

Why Indian MSMEs Suffer
from GST Anxiety

1.4 crore GST-registered businesses face three painful realities every single month. ONE HUNDRED was built to solve all three.

01
📨

GST Notices & Demands

Errors in return filing cause GSTR-1 vs GSTR-3B mismatches, triggering automated department demands that are costly and time-consuming to resolve. Most small businesses have no idea why they are getting notices.

ONE HUNDRED → AI catches mismatches before filing
02
💸

Unaffordable Professional Fees

Professional GST filing services charge ₹500–₹3,000 per GSTIN per month. For a kirana store or micro-enterprise with wafer-thin margins, quality compliance is simply out of reach.

ONE HUNDRED → ₹200/month. Period.
03
🔒

Data Security Fears

Business owners fear sharing invoice data with third parties. Competitor misuse, data leakage, and lack of transparency in what happens to their financial data are genuine concerns that keep millions away from outsourced filing.

ONE HUNDRED → You approve before we file. Always.

The Process

Five Steps to Zero-Error Filing

From raw invoice data to GSTN portal acknowledgment — every step validated, reviewed and approved.

📥
1

Data Collection

Upload via free billing software, Tally, Zoho, OCR scan, or CSV. Any format. Any volume.

🤖
2

AI Validation

5-level engine validates GST rates, GSTIN status, ITC reconciliation and anomaly detection.

👨‍💼
3

Expert Review

Our qualified tax professional personally reviews every return draft and resolves all flags before it reaches you.

✅
4

Your OTP Approval

You receive a full summary. Approve with a WhatsApp OTP. Nothing filed without your consent.

📤
5

Filed & Done

Return filed on GSTN. ARN sent instantly by SMS, email and WhatsApp. Done.

Platform Features

Everything Built In.
Nothing Extra to Pay.

Every feature below is included in your ₹2,400/year plan. No add-on charges, no surprise fees.

🧾

Free Billing Software

GST-compliant invoicing with GSTIN validation and offline mode.

🔗

Software Integrations

Tally, Zoho, Busy, Marg, Vyapar, Excel/CSV — all connected.

🤖

AI Validation Engine

5-level validation catches every error before the return is prepared.

📷

OCR Invoice Scanner

Photograph manual bills. AI reads and digitises them instantly.

🛡️

Bank-Grade Security

AES-256 encryption, per-client data isolation, strict privacy.

📲

WhatsApp Workflow

All approvals, summaries and ARNs delivered via WhatsApp.

Free Billing Software
Included at zero cost. Your billing data feeds directly into GST filing.
GST-compliant B2B, B2C, and export invoice generation
Live GSTIN validation on every invoice via GSTN API
HSN/SAC code lookup with auto-fill
Purchase register with auto ITC calculation
Offline mode with auto-sync — works with poor connectivity
Mobile app for on-the-go invoice entry
₹0 Additional Cost — Always
Software Integrations
Already using accounting software? Just connect — we pull your data.
TallyPrime / Tally ERP 9 — Direct XML/JSON export integration
Zoho Books — Real-time API sync
Busy Accounting — CSV/XML import
Marg ERP, Vyapar, QuickBooks India
Excel / CSV upload with intelligent field mapping
No manual re-entry. No data entry errors at source.
No Re-Entry. No Manual Work.
AI Validation Engine
The engine behind our zero-error guarantee — 5 levels of checks.
L1: Data completeness + GSTIN active status verification
L2: GST rate validation per HSN/SAC + RCM identification
L3: GSTR-2B ITC reconciliation + Section 17(5) blocked credits
L4: GSTR-1 vs GSTR-3B cross-return consistency check
L5: Statistical anomaly detection + department notice risk scoring
Zero Errors Reach the Portal
OCR Invoice Scanner
For businesses still on manual or handwritten bills.
Photograph printed or handwritten invoices with your mobile
AI extracts invoice number, date, party name, amount, and GST
Validates extracted data against GSTN records automatically
Flags low-confidence extractions for your review before processing
Gradually migrate to digital billing through our free software
No Keyboard. No Errors.
Bank-Grade Data Security
Your financial data belongs to you. We treat it accordingly.
AES-256 encryption for all data at rest
TLS 1.3 for all data in transit
Per-client data isolation — zero cross-client data access
GST portal credentials stored in Hardware Security Module (HSM)
Complete audit log: every action on your data is time-stamped
Zero Sharing With Any Third Party
WhatsApp-First Workflow
No app to install. No portal to log into. Just WhatsApp.
Data collection reminders sent to your WhatsApp monthly
Return summary with full tax liability delivered via WhatsApp
One-tap OTP approval directly from your WhatsApp message
Filing ARN acknowledgment sent instantly after portal submission
Department notice alerts and deadline reminders via WhatsApp
Works on Any Phone, Any Plan

AI Validation Engine

5 Levels of Checks.
Before Every Single Return.

A systematic, AI-powered process that runs before a single rupee of tax is reported to the government.

01
Data Completeness
  • All mandatory fields present
  • GSTIN format validation
  • Active status on GSTN portal
  • Invoice sequence check
02
Rate & Arithmetic
  • Correct rate per HSN/SAC
  • CGST + SGST = IGST checks
  • RCM liability detection
  • Place of supply validation
03
ITC Reconciliation
  • GSTR-2B auto-matching
  • Section 17(5) blocked credits
  • ITC reversal triggers
  • Rule 42/43 applicability
04
Cross-Return Check
  • GSTR-1 vs GSTR-3B match
  • E-way bill reconciliation
  • Prior month ITC carry-over
  • Liability consistency
05
Anomaly Detection
  • Statistical outlier flagging
  • Prior period comparison
  • Notice risk score per return
  • Unusual ITC claim detection

Simple Pricing

One Price.
Everything Included.

No hidden charges. No per-notice fees. No per-transaction costs. Pay ₹2,400 once a year and your GST compliance is handled professionally.

Core GST Plan — Annual
₹100
Per return per month  ·  2 returns × ₹100 = ₹200/month  ·  Paid annually at ₹2,400/year
GSTR-1 Filing (due 11th every month)
GSTR-3B Filing (due 20th every month)
Free Billing Software — lifetime, zero cost
AI 5-Level Validation on every single return
Expert review and sign-off before filing
Client OTP approval before filing — always
ARN acknowledgment via SMS + WhatsApp
Tally / Zoho / CSV / OCR integrations
AES-256 encrypted data storage
WhatsApp-first communication workflow
Enrol for ₹2,400 / Year →
Add-On Services

GST Notice Reply

Scrutiny notices, demand orders, ASMT-10 responses handled end-to-end

₹500 – ₹2,000

Income Tax Return

ITR-3 and ITR-4 for business owners and professionals

₹1,500 – ₹5,000

TDS Return Filing

Form 24Q and 26Q quarterly filings

₹2,000 / year

Annual Accounts

Books, P&L, Balance Sheet preparation

₹5,000 onwards

Tax Advisory Session

One-on-one GST planning and tax advisory

₹500 / hour

Why Trust ONE HUNDRED

Numbers That
Build Confidence

13+

Years of Experience

Our team brings over 13 years of hands-on experience in GST compliance, income tax, and audit — across businesses of all sizes and industries in India.

ZERO

Error Target Per Return

Our 5-level AI validation engine and mandatory expert review is designed with one obsession: no error reaches the GST portal. Not a promise — a systematic process.

2

Approvals Before Filing

Expert review first. Then your OTP approval. Filing happens only after both are confirmed. You are always in complete control of your data and your return.

₹100

A Price, A Promise

ONE HUNDRED is trademarked because ₹100 per return is not a promotional rate — it is the permanent, founding price of this business. Built to last and never change.

24

Returns Filed Per Year

GSTR-1 + GSTR-3B every month = 24 returns per year, each validated by AI and reviewed by our expert — all covered in your ₹2,400 annual plan.

1.4Cr

Underserved Businesses

Over 1.4 crore active GST registrations in India. Most are MSMEs who deserve — and can now access — professional, affordable GST compliance.

About ONE HUNDRED

Built by Experts.
Priced for Everyone.

ONE HUNDRED was founded with a single conviction: that every Indian MSME — however small — deserves professional, error-free GST compliance at a price they can actually afford.

The ₹100 per return price point is not a discount or a promotional offer. It is the permanent, foundational price of this business — made possible by combining AI-powered validation technology with deep tax expertise and a commitment to operational efficiency.

What makes ONE HUNDRED different is the dual approval model: every return is reviewed by our expert before being sent to you. You approve it with an OTP. Nothing is filed without your explicit sign-off. Your data, your return, your decision — always.

The trademark on ONE HUNDRED is a promise to every client that this brand, this price, and this standard of service are here to stay.

Get Started with ONE HUNDRED →
ONE HUNDRED™
Taxes Simplified · Trademark Applied
Founded to make professional GST compliance accessible to every MSME in India
Over 13 years of combined tax compliance and audit experience
Expert team with deep GST, direct tax, and accounting expertise
AI-first platform built specifically for Indian GST compliance
Zero third-party data sharing — strict client data privacy
Serving MSMEs across Tamil Nadu and pan-India

"We built ONE HUNDRED because we saw firsthand how small businesses were being failed — by expensive services, by errors that led to notices, and by a complete lack of transparency in how their data was being handled. ONE HUNDRED changes all three."

— The ONE HUNDRED Team

Client Voices

What Our Clients
Are Saying

Real experiences from business owners who made the switch to ONE HUNDRED.

★★★★★

For three years I was receiving notices from the GST department. Since switching to ONE HUNDRED, not a single notice in 8 months. The team called me to explain an ITC issue I didn't even know I had. I never expected this level of service at ₹2,400 per year.

R
Ravi Kumar
Ravi Trading Company · Chennai
★★★★★

My biggest worry was sharing my business invoice data. The way ONE HUNDRED works — I see exactly what is being filed and approve it with an OTP before anything is submitted — gave me complete confidence. No one else gives this level of transparency and control.

P
Priya Suresh
Priya Garments · Coimbatore
★★★★★

We use TallyPrime for our accounts. ONE HUNDRED connects to it and pulls the data automatically. No re-entry, no manual work on our side. The free billing app they gave us for our retail counter is also excellent. Worth every rupee of the ₹2,400.

S
Suresh Babu
Suresh Auto Parts · Madurai

Integrations

Works With the Software
You Already Use

No need to change how you work. We connect to your existing tools — or give you new ones for free.

📊
TallyPrime
Live
📗
Zoho Books
Live
🔵
Busy Accounting
Live
📘
Marg ERP
Soon
🟢
Vyapar
Soon
📱
ONE HUNDRED App
Live
📷
OCR Scanner
Beta
📋
Excel / CSV
Live

Dual Approval Workflow

You See Everything.
Before We File Anything.

The most important differentiator of ONE HUNDRED is the complete control we give you over your own compliance.

01

Expert Review & Approval

Before your return reaches you, our qualified tax professional reviews the complete return draft, the AI validation report, and every resolved flag.

  • AI validation report reviewed line by line
  • All warnings and flags personally resolved
  • Return accuracy confirmed before sending
  • Expert digitally approves — timestamped and logged
  • Only then does your approval request get sent
02

Your OTP Approval

You receive a complete summary of your return on WhatsApp and via email — total liability, ITC claimed, and net amount payable.

  • Return summary delivered via WhatsApp + email
  • Shows total tax payable, ITC, and net cash outflow
  • Approve with a simple OTP on WhatsApp
  • Filing happens only after your explicit approval
  • ARN sent to you within minutes of portal submission
AI

The Validation Engine

Our 5-level AI validation is what makes the zero-error guarantee possible. It runs before every single return, every single month.

  • Checks every invoice against GSTN live API
  • Reconciles purchases against GSTR-2B automatically
  • Flags ITC blocked under Section 17(5) instantly
  • Identifies mismatches between GSTR-1 and GSTR-3B
  • Assigns a department scrutiny risk score per return
🔒

Data Security You Can Verify

Your financial data is not shared with anyone. Technical isolation guarantees this at a structural level — not just contractually.

  • Per-client AES-256 encrypted database partitions
  • GST portal credentials stored in Hardware Security Module
  • Role-based access controls — least privilege enforced
  • Full audit log: every access timestamped
  • ISO 27001 certification roadmap in progress

Start Filing GST at
₹100 per Return

Leave your WhatsApp number and our team will contact you within 24 hours to onboard you. Annual plan at ₹2,400 — paid upfront, zero surprises.

By submitting, you agree to be contacted on WhatsApp. No spam. No sales pressure.

Expert-Supervised Filing
No Hidden Charges
Data Never Shared
You Approve Before We File
Trademark Protected Brand

FAQ

Questions We Get
Asked Most

Is ₹100 per return really the final price?+

Yes — absolutely. ₹100 per return per month is the complete, all-inclusive price. GSTR-1 + GSTR-3B = 2 returns = ₹200/month = ₹2,400/year, paid upfront. Free billing software included. No GST surcharge, no service fee, no renewal surprises.

How is my data protected from competitors?+

Every client's data is stored in AES-256 encrypted storage with a unique per-client encryption key. No team member has simultaneous access to multiple clients' data. Strict contractual and technical no-sharing policies apply. Your data will never be sold, rented, or disclosed.

I use TallyPrime — do I need to change anything?+

Not at all. ONE HUNDRED integrates directly with TallyPrime and Tally ERP 9 via XML/JSON export. Your invoice data is pulled automatically each month — no re-entry, no sharing Excel files over WhatsApp, no manual work. Connect once and we handle the rest.

Can I see my return before it is filed?+

This is a non-negotiable core feature. You receive a complete summary — total liability, ITC claimed, net payable — before any filing happens. You approve with an OTP on WhatsApp. We file only after your OTP. No exceptions, ever.

I have manual or handwritten bills. Can you help?+

Absolutely. Our OCR scanner lets you photograph physical bills with your mobile. AI extracts all invoice data. We also provide a free digital billing software so you can migrate away from manual bills at your own pace.

What if I receive a GST notice after filing?+

Our 5-level validation is designed to prevent notices entirely. But if one arrives, we provide GST notice reply as an add-on at ₹500–₹2,000 per case. Our tax professional handles the complete response and department communication on your behalf.

Is this only for micro and small businesses?+

The core ₹100 plan is ideal for MSMEs with turnover up to ₹5 crore. We welcome medium enterprises too — customised plans available for higher transaction volumes. Reach out and we will structure the right engagement for your business.

What other services does ONE HUNDRED offer?+

Once onboarded, you can add Income Tax Return (ITR) filing, TDS Return filing, Annual Accounts and P&L preparation, and direct advisory for tax planning — all as affordable add-ons to your core GST plan.

💬 Chat on WhatsApp