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

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

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The Complete GST Filing Software for Tax Consultants and CAs

GSTR-1 Filing

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Auto-Populated Returns

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

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Intelligent Data Import

Effortlessly upload invoices in Excel or JSON formats.

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Built-in Validation Engine

Spot invoice errors before they result in notices or rejections.

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Amendment Tracking

Transparent audit trails for all amendments.

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Flexible Filing

File monthly or quarterly returns based on your turnover.

File GSTR-1 Now

GSTR-3B Filing

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Pre-Filled & Auto-Matched Data

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

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Precise Liability Calculation

Auto-calculate your tax liabilities across all categories.

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Instant Reconciliation

Detect mismatches in real time and fix them before filing.

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ITC Maximizer

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

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Turnover-Based Filing

Easily file monthly or quarterly returns based on your eligibility.

File GSTR-3B Now

Why 85,000+ Tax Professionals Trust Optotax

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100% FREE
GST Filing

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

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One-Click
Auto-Filing

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

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Smart
Validations

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

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Multi-GSTIN & Client
Management

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

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Reconciliation-Backed
Filing

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

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100% Cloud-
Based

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

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Enterprise-Grade
Security

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

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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 in just a few clicks.

Get Started

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GST Compliance Has Never Been This Easy!

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

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Security You Can Trust

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

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Frequently Asked Questions