How to Use the GST Portal for Return Filing and Payments

Introduction

The GST portal is where you file your monthly returns and pay your tax. If you are registered for GST, you must use it every month. Many small business owners find it confusing at first—the buttons, the forms, the deadlines. This guide answers one simple question: how do you actually log in, fill your return, and pay your tax on the portal?

You do not need to be a computer expert. We will walk you through each step as if you were sitting at a shop counter with a cup of tea. By the end, you will know exactly what to do on the 11th and 20th of every month.

Understanding the GST Portal and Return Deadlines

The GST portal (gst.gov.in) is the official government website. You use it to tell the government how much you sold (outward supplies) and how much you bought (inward supplies). You also pay your GST tax here.

There are two main returns you file every month. The first is GSTR-1, which lists all the goods or services you sold. Think of it like a record book where you write down every customer invoice. You must file GSTR-1 by the 11th of the following month. So if you sold goods in January, you file GSTR-1 by 11 February.

The second return is GSTR-3B, which is a summary. It says: "I sold goods worth this much, I bought goods worth this much, my tax to pay is this much." You file GSTR-3B by the 20th of the following month. So for January sales, you file GSTR-3B by 20 February.

Both returns are mandatory. If you miss the deadlines, you will pay interest and possibly a penalty. It is like a water bill—if you do not pay by the due date, you owe extra money.

The portal also lets you view documents uploaded by your suppliers (what the government calls GSTR-2A). This is a summary of invoices raised to you. You can check this, correct any errors, and use it to claim tax credits.

To access the portal, you need your GSTIN (the 15-character number you got when you registered). You log in using your username and password, or with a digital signature certificate if your business is complex.

The portal also has a payment section. You can pay your GST liability directly through the website using net banking, credit card, or debit card. You can also link your bank account for automatic payments if your business is large.

A Simple Example

Let us meet Ramesh, who runs a mobile phone repair shop in Bangalore. In January, he repaired phones and earned ₹80,000 in sales. His GSTIN is registered, so he must file returns.

On 5 February, Ramesh logs into gst.gov.in. He clicks on "GSTR-1." The portal shows him a form where he enters each customer invoice. He repaired 40 phones at ₹2,000 each. He fills in the customer names (or leaves them blank for walk-in customers), the invoice numbers, dates, and amounts. He also enters the GST rate—let us say 18% for repair services. The portal calculates: 18% of ₹80,000 = ₹14,400. This is the GST he must collect.

Ramesh clicks "Submit" before 11 February. Done with GSTR-1.

Now, Ramesh also bought spare parts in January for ₹30,000. He got invoices from his suppliers. When those suppliers file their GSTR-1, the government sends Ramesh a summary (GSTR-2A) showing what he purchased. Ramesh checks this on the portal by 15 February.

On 18 February, Ramesh logs in again and files GSTR-3B. The portal shows:

• GST collected: ₹14,400
• GST he paid on purchases: ₹5,400 (18% of ₹30,000)
• Net GST to pay: ₹14,400 − ₹5,400 = ₹9,000

Ramesh enters this summary, clicks "Submit," and then goes to the payment section. He selects "Make Payment," chooses net banking, and pays ₹9,000 to the government before 20 February. He receives a receipt.

That is the monthly cycle. Ramesh repeats this in March, April, and every month of the year.

Who This Applies to

• You must file returns on the GST portal if: You are registered for GST and have made any supplies (sold goods or services) in the month.
• You must file even if you sold nothing: The portal requires you to file a "nil return" (all zeros).
• You must pay the GST you collected: Customers paid you GST; you must hand this to the government.
• You can claim back GST you paid on purchases: This is called input tax credit. Use GSTR-2A to check what the government recorded.
• If you missed a deadline: File late on the portal and expect to pay interest. Check how much interest you owe.
• If you are unsure about your GST position: Verify your registration status and turnover limits before filing.

Check Your GST Position

Before you start filing, confirm you actually need to be registered. If your yearly turnover is below ₹40 lakh (goods) or ₹20 lakh (services), you may not need GST. Special category states have a ₹10 lakh limit. Head to the free GST threshold checker and enter your turnover to confirm. The tool runs in your browser—no login needed.

Conclusion

The GST portal is not as scary as it looks. You log in, fill in your sales (GSTR-1), check your purchases (GSTR-2A), file your summary (GSTR-3B), and pay your tax before the 20th. Repeat every month.

The key dates are the 11th (GSTR-1) and the 20th (GSTR-3B and payment). Mark them on your calendar, or ask your accountant to remind you. If you miss these dates, you pay extra money in interest.

This guide is informational only. GST rules can change, and your situation may be unique. Always confirm the current deadline dates and filing requirements on the official GST portal (gst.gov.in) or speak with a qualified CA before you file.