Introduction
Goods and Services Tax (GST) has become the backbone of India’s indirect tax system. It unifies multiple taxes under one umbrella and brings transparency to business transactions. For every business, whether small or large, GST filing for beginners can seem challenging, yet it is a mandatory requirement to remain compliant with the law. However, many beginners struggle with the complexity of GST returns, paperwork, and online procedures. This often leads to mistakes, penalties, and unnecessary stress.
This blog will guide you through the step-by-step GST filing process in the simplest way possible. Whether you are a student exploring career opportunities or a professional looking to build your expertise, learning GST filing can add immense value to your career.
What is GST Filing?
Before diving into the process, let’s understand what GST filing means.
Definition of GST Filing
GST filing refers to submitting details of sales, purchases, input tax credit, and tax paid to the government through the GST portal. Every registered business must file returns to report their transactions accurately.
Importance of GST Filing
Filing GST returns ensures that businesses stay compliant, avoid penalties, and maintain proper financial records. It also helps the government track tax collection and prevent revenue leakages. For businesses, timely filing of returns improves credibility and builds trust with clients, suppliers, and authorities.

Prerequisites Before Filing GST
Before you begin filing, certain preparations are essential to make the process smooth and error-free.
GST Registration
Only businesses with a valid GSTIN (Goods and Services Tax Identification Number) can file returns. Registration is the first step to becoming GST-compliant.
Required Documents
Keep the following documents ready: PAN, Aadhaar, sales and purchase invoices, bank account details, and relevant financial data. These ensure accuracy during filing.
Digital Signature / Login Credentials
For companies, a Digital Signature Certificate (DSC) is mandatory. Individuals and proprietors can file returns using OTP verification. Secure login credentials to the GST portal India are also essential.
Step-by-Step Process of Filing GST Returns
Filing GST returns online may seem daunting, but breaking it down into steps makes it simple.
Step 1: Login to GST Portal
Visit the official GST portal (www.gst.gov.in) and log in using your GSTIN, username, and password.
Step 2: Select the Type of Return
Choose the relevant return form.
- GSTR-1: For outward supplies (sales).
- GSTR-3B: A monthly self-declaration of sales, purchases, and tax liability.
Other returns like GSTR-9 (annual) apply to specific businesses.
Step 3: Enter Invoice-Wise Sales Details
Add details of outward supplies including invoice number, GSTIN of buyer, taxable value, and applicable tax. Accuracy here is crucial to avoid mismatches.
Step 4: Upload Purchase Details (Input Tax Credit)
Enter purchase details to claim Input Tax Credit (ITC). ITC allows businesses to reduce their tax liability by offsetting the tax already paid on purchases.
Step 5: Verify Auto-Populated Data
The system automatically fetches data from your suppliers’ filings. Cross-check these details to ensure accuracy and avoid discrepancies.
Step 6: Payment of Tax (If Applicable)
If the tax payable is higher than ITC, pay the remaining amount online through net banking, NEFT/RTGS, or credit/debit card.
Step 7: Submit & File Return
After reviewing, use an OTP or Digital Signature Certificate to submit the return. Once submitted, an acknowledgment reference number (ARN) is generated for future reference.

Common Mistakes to Avoid in GST Filing
Even small mistakes can lead to penalties or rejection of returns. Beginners should watch out for:
- Entering Wrong GSTIN: Incorrect GSTIN can cause data mismatch.
- Missing Invoice Data: Leaving out invoices can reduce input credit.
- Ignoring Filing Deadlines: Delayed filing leads to late fees and interest.
- Incorrect Input Tax Credit Claim: Claiming ITC without valid documents may attract penalties.
Benefits of Learning GST Filing
Mastering GST filing is not just about compliance—it opens doors to career opportunities.
- Better Job Opportunities: Skilled GST professionals are in high demand.
- Improved Compliance for Businesses: Accurate filing reduces the risk of audits and penalties.
- Saves Time & Reduces Errors: Knowledge of the process makes filing quick and hassle-free.
- Adds Professional Value: Upskilling in GST makes you an asset in finance and accounting roles.
Conclusion
Learning how to file GST returns is an essential skill in today’s business world. It ensures compliance, builds credibility, and prevents costly errors. For students and professionals, mastering GST filing offers excellent career prospects in finance, accounting, and taxation.
At Sharada Academy of Professional Studies, we offer hands-on GST training in Mangalore to help you gain practical experience and confidence. Our expert trainers and real-world projects make learning simple, effective, and career-focused. Take your first step toward becoming GST-proficient today!
FAQs
What is the due date for GST filing?
Due dates vary depending on the type of return. For example, GSTR-3B is usually due by the 20th of the following month.
What happens if I miss filing GST returns?
Late filing attracts penalties, late fees, and interest on tax liability.
Can GST be filed without professional help?
Yes, small businesses and individuals can file on their own if they understand the process. However, professional guidance ensures accuracy.
Is GST filing mandatory for all businesses?
Yes, any business with annual turnover above the prescribed threshold must register and file returns.
How can Sharada Academy help me learn GST filing?
Sharada Academy offers job-oriented GST training courses in Mangalore, covering GST returns, e-invoicing, and compliance with practical sessions.