GST Return Filing Basics for Beginners – Step-by-Step Guide, Types of Returns, and Common Mistakes to Avoid

Oct 26, 2025

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The Goods and Services Tax (GST) system has revolutionized India’s indirect tax structure since its launch in July 2017, merging multiple taxes like VAT, Excise, and Service Tax into one unified framework. Every business registered under GST must file GST returns to report their sales, purchases, and tax liabilities to the government.

According to the Ministry of Finance, over 1.4 crore businesses are currently registered under GST in India, and more than 90 lakh GST returns are filed monthly across the country.

If you’re new to GST or have recently registered your business, understanding the filing process is crucial to avoid penalties and maintain compliance. In this detailed article, we’ll cover the basics of GST return filing, including the types of returns, deadlines, preparation tips, and common errors to avoid — explained in simple, practical language.

What Is a GST Return?

A GST Return is a document containing details of a taxpayer’s income, sales, purchases, and tax liability for a specific period. This document is submitted to the Goods and Services Tax Network (GSTN) either monthly, quarterly, or annually.

When a business files its GST return, the system automatically calculates:

Tax liability (based on sales and purchases)
Input Tax Credit (ITC) available
Net payable tax to be submitted to the government

Who Needs to File GST Returns?

Any business or individual registered under GST must file returns regularly. This includes:

Regular taxpayers
Composition scheme taxpayers
Input service distributors (ISD)
E-commerce operators
Casual taxable persons

Even if there are no transactions during a month or quarter, a NIL return must still be filed to stay compliant.

Types of GST Returns

Here’s a detailed breakdown of the main GST return forms, their purpose, and filing frequency:

Return Form	Description	Filed By	Frequency
GSTR-1	Details of outward supplies (sales) made during the period.	Regular taxpayers	Monthly / Quarterly
GSTR-2B	Auto-generated statement of input tax credit (ITC).	Regular taxpayers	Monthly
GSTR-3B	Summary return showing tax liability and input tax credit.	Regular taxpayers	Monthly
GSTR-4	Return for taxpayers under the composition scheme.	Composition dealers	Quarterly
GSTR-5	For non-resident taxable persons.	Non-resident	Monthly
GSTR-6	Return for input service distributors (ISD).	ISDs	Monthly
GSTR-7	Return for entities deducting TDS under GST.	TDS deductors	Monthly
GSTR-8	Filed by e-commerce operators collecting TCS.	E-commerce operators	Monthly
GSTR-9	Annual return for regular taxpayers.	Regular taxpayers	Annually
GSTR-9C	Reconciliation statement certified by a CA.	Taxpayers above ₹5 crore turnover	Annually

Step-by-Step Process for Filing GST Returns

Let’s understand the step-by-step GST return filing process that every business should follow:

Step 1: Collect and Organize Data

Ensure all sales invoices, purchase bills, and credit/debit notes are collected for the period. Use accounting software like Excel or Tally to summarize:

Category	Example
Sales (Outward Supplies)	Local & interstate sales
Purchases (Inward Supplies)	Raw materials, service invoices
Debit/Credit Notes	Purchase returns, corrections
Tax Collected & Paid	CGST, SGST, IGST, Cess

Step 2: Verify Input Tax Credit (ITC)

Check your GSTR-2B for eligible ITC. Compare with your purchase records to avoid mismatches. Ineligible credits can lead to penalties or tax liabilities later.

Step 3: File GSTR-1 (Sales Data)

Report all outward supplies made during the period.
Ensure correct GSTIN, invoice number, and tax amount.
Once GSTR-1 is filed, the data reflects in your buyers’ GSTR-2B.

Step 4: File GSTR-3B (Summary Return)

Declare total sales, ITC, and tax payable.
Pay the net tax liability after adjusting ITC.
This step finalizes your monthly GST liability.

Step 5: File Annual Return (GSTR-9)

Includes consolidated details of sales, purchases, ITC, and taxes paid for the entire year.
Mandatory for taxpayers with annual turnover above ₹2 crore.

Important GST Filing Deadlines

Return Type	Periodicity	Due Date
GSTR-1	Monthly	11th of the following month
GSTR-3B	Monthly	20th of the following month
GSTR-4	Quarterly	18th of the following quarter
GSTR-9	Annual	31st December following the financial year

Example:
For the month of September 2025,

GSTR-1 → Due by 11th October 2025
GSTR-3B → Due by 20th October 2025

Penalties for Late or Incorrect Filing

Filing returns on time is essential. The GST Act imposes penalties for late submissions or incorrect data.

Type of Default	Penalty Amount
Late filing of return	₹50 per day (₹25 CGST + ₹25 SGST)
Late filing of NIL return	₹20 per day (₹10 CGST + ₹10 SGST)
Non-filing for multiple months	Suspension or cancellation of GSTIN
Incorrect data or mismatch	Interest @18% per annum on tax due

Tip: Always reconcile data monthly to avoid interest or penalties.

Tools and Techniques for Easier GST Return Filing

Method	Benefit
Excel Templates	Easy to manage data offline before uploading
Tally Prime	Auto-sync GST data and generate returns
Government Offline Utility	Official tool for GSTR-1 and GSTR-3B preparation
Excel Power Query	Data cleaning and report automation
VLOOKUP/INDEX-MATCH Formulas	Fast reconciliation of invoice mismatches

Many accountants combine Excel and Tally to automate tax summaries and reduce manual errors by up to 80%.

Common Mistakes Beginners Should Avoid

Not reconciling GSTR-2B with purchase records – Leads to ITC rejection.
Entering wrong GSTIN or invoice number – Causes mismatch in buyer’s return.
Missing deadlines repeatedly – Can cause suspension of GST registration.
Claiming ineligible ITC – Especially for personal or non-business expenses.
Incorrect tax calculation – Especially distinguishing between CGST/SGST and IGST.

Pro Tip: Maintain a monthly GST compliance checklist in Excel with columns for:

Filing Date
Return Type
Payment Done
Remarks

This helps track submission status efficiently.

Benefits of Timely and Accurate GST Filing

Compliance Reputation: Regular filing ensures your business is trusted by suppliers and government authorities.
Smooth ITC Claims: Accurate filing prevents loss of Input Tax Credit.
No Penalties: Avoid late fees and interest charges.
Faster Loan Approvals: Banks often require updated GST filings for business loans.
Transparency in Records: Builds reliability with clients and vendors.

According to a 2024 report by the Institute of Chartered Accountants of India (ICAI), businesses that file GST returns on time show 20% higher operational efficiency and face fewer audit issues.

Example of a Basic GST Calculation in Excel

Details	Value (₹)
Product Price	10,000
GST Rate	18%
GST Amount	=10,000 × 18% = 1,800
Total Invoice Value	=10,000 + 1,800 = 11,800

By using Excel formulas like =A2*18% or =SUM(A2:A5), beginners can easily calculate GST and prepare summaries for GSTR-1.

Future of GST Return Filing in 2025 and Beyond

The government is increasingly pushing for automation and transparency in GST compliance.

AI-based data validation and auto-matching are being introduced.
Real-time invoice uploads and e-invoicing are expected to be mandatory for all businesses with turnover above ₹5 crore.
Tools like Power BI integrated dashboards will soon make compliance monitoring faster and more accurate.

Learning Excel automation for GST, especially with VBA macros, can help professionals save hundreds of hours annually.

Conclusion

Filing GST Returns is a crucial responsibility for every registered business in India. While it might seem complex at first, using structured tools like Excel or Tally, maintaining data accuracy, and filing returns on time can make the process seamless.

For beginners, mastering GST basics is not just about compliance — it’s about gaining control over financial data and building trust in the marketplace. With consistent practice and proper record-keeping, anyone can become GST-compliant and confident in managing their business tax operations.

Disclaimer

This article is intended for informational and educational purposes only. Figures, timelines, and examples are based on prevailing GST guidelines as of 2025. Readers should verify the latest updates or consult a certified tax professional before filing returns.

About the author

I’m Himanshu Dhar, a dedicated MIS trainer proudly associated with I Turn Institute. My journey in the realm of data management and automation spans over 14 enriching years. My passion for this field extends to freelancing projects, where I bring real-world practicality into my teaching. My impact in education is marked by the success of over 25,000 students I’ve had the privilege of mentoring, hailing from diverse backgrounds. Beyond the classroom, I’ve had the honor of conducting corporate training sessions and seminars, catering to the unique needs of businesses. Let’s unlock your potential together in the realm of data analysis and automation.