GST Return Filing That Won’t Tax Your Patience. Fast, Simple & FREE!

Effortlessly file GSTR-1, GSTR-3B, and GSTR-9 with India’s smartest GST software.

The Complete GST Filing Software for Tax Consultants and CAs

GSTR-1 Filing

Auto-Populated Returns

View and file GSTR-1 with data fetched directly from the GST portal.

Intelligent Data Import

Effortlessly upload invoices in Excel or JSON formats.

Built-in Validation Engine

Spot invoice errors before they result in notices or rejections.

Amendment Tracking

Transparent audit trails for all amendments.

Flexible Filing

File monthly or quarterly returns based on your turnover.

File GSTR-1 Now

GSTR-3B Filing

Pre-Filled & Auto-Matched Data

Smart auto-fetch from GSTR-1 and GSTR-2B for faster, more accurate filing.

Precise Liability Calculation

Auto-calculate your tax liabilities across all categories.

Instant Reconciliation

Detect mismatches in real time and fix them before filing.

ITC Maximizer

Claim every eligible credit with AI-driven Input Tax Credit optimization.

Turnover-Based Filing

Easily file monthly or quarterly returns based on your eligibility.

File GSTR-3B Now

GSTR-9 Filing

Auto-Populated GSTR-9

Auto-pull monthly return data for seamless annual compilation.

Reconcile with GSTR-2B

Cross-verify ITC before filing to avoid errors and ensure accuracy.

Year-Round Auto Compilation

Always up-to-date summaries—no year-end rush or backlogs.

Table-Wise Verification

Run detailed validations across all 19 tables.

Deadline Alerts & Reminders

Smart reminders so you never miss the filing due date.

File GSTR-9 Now

Why 85,000+ Tax Professionals Trust Optotax

100% FREE
GST Filing

File GSTR-1, GSTR-3B, &
GSTR-9, monthly, quarterly, or annually, with zero platform fees. No hidden limits.

One-Click
Auto-Filing

Pre-filled return data from reconciled records and portal fetches—zero duplication, zero rework.

Smart
Validations

Spot errors before the portal does. Built-in validations help reduce rejections, GST interest, & compliance notices.

Multi-GSTIN & Client
Management

Whether you handle 10 or 100 GSTINs, manage them all effortlessly from one intuitive GST Return dashboard.

Reconciliation-Backed
Filing

Ensure every return is audit-ready. Link your GSTR filings with reconciliation reports to eliminate mismatches & claim 100% eligible ITC.

100% Cloud-
Based

No downloads. No connectors. Just seamless, secure access across web and desktop—anytime you need it.

Enterprise-Grade
Security

SSL, ISO & SOC 2
certified with 2FA, audit trails, role-based access, and secure data handling practices.

Built by OPEN. Backed by
Experts.

Trusted infra by India’s leading SME neobank—built for pros who can’t afford errors and need smart automation.

Get Started in Just 3 Steps

Step 1

Sign Up — It’s Free

Get started in under 2 minutes. No credit card or setup fees.

Step 2

Add Clients & Auto-Fetch Data

Add multiple GSTINs in one go & instantly pull return data from the GST portal.

Step 3

Review, Validate & File

Review pre-filled data, run smart validations, & file GSTR-1, 3B, & 9 in just a few clicks.

Get Started

Backed by

GST Compliance Has Never Been This Easy!

Join 85,000+ GST experts who trust Optotax for simple, secure, and stress-free GST filings.

Security You Can Trust

We follow globally accepted compliance and security protocols to protect your data and ensure full regulatory alignment.