Difference Between GSTR-1 and GSTR-3B

6 min readUpdated on 8th Jul, 2026by Angel One
GSTR-1 and GSTR-3B are two important GST returns, and understanding the difference helps avoid errors. GSTR-1 reports the outward supplies, whereas GSTR-3B reports the tax liability and ITC.
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Filing GST return is an important process through which businesses report their sales, purchases, and tax liability to the government. There are several forms; among them GSTR-1 and GSTR-3B are crucial for a business. Understanding the difference between these two returns is crucial in order to maintain a smooth reporting process and avoid mistakes in the reporting process due to data mismatches. It also helps avoid penalties due to delayed filing. 

Key Takeaways 

  • GSTR-1 contains information regarding outward supply, including sales invoices, debit notes, credit notes, exports, and amendments. 

  • GSTR-3B is a summarized form for declaring tax liability, claiming ITC, and paying GST. 

  • GSTR-1 is usually filled prior to GSTR-3B as GSTR-3B can get auto-filled values from GSTR-1, GSTR-1A, and GSTR-2B. 

  • GSTR-1A facilitates certain modifications in the current period after filing GSTR-1 but before GSTR-3B. 

What Are GSTR-1 and GSTR-3B? 

GSTR-1 is a statement of return that needs to be filed by all registered entities in India with GST authority in terms of their outward supplies of goods and services. It contains information on invoice level for all B2B, B2C supplies, exports, credit note, debit note, advance, and amendments.  

GSTR-3B is more of a summary return report that gives a gist of the total outward tax liability, eligible input tax credit, the reverse change liability, interest, late fees, and the final GST amount payable. Filing this report is compulsory for all GST-registered taxpayers, normal or casual, even if there’s no business activity in a particular tax period. In that case, filing a nil report is mandatory to avoid penalties.  

Difference Between GSTR-1 and GSTR-3B 

Basis 

GSTR-1 

GSTR-3B 

What it's for 

It reports all your outward supplies (sales) for the period. 

It summarises your overall tax liability, the input tax credit you're claiming, and the actual tax payment. 

Level of detail 

Records sales details minutely for every invoice and associated document. 

Records details as a consolidated summary rather than individual transactions. 

 

Tax payment 

Filing GSTR-1 doesn't necessarily involve any actual GST payment. 

This is where you actually pay off your GST liability. 

Role in ITC 

It lets your buyers see what invoices you've reported, so they can match them against their own records. 

This is where you actually claim the ITC you're eligible for. 

Overall impact 

Mainly affects how your sales are reported and how smoothly buyers can reconcile their credits. 

Directly affects your tax payments, your ITC claims, and your overall compliance standing. 

 When Are GSTR-1 and GSTR-3B Due? 

Return 

Monthly Filing 

Quarterly Filing 

GSTR-1 

Due by the 11th of the next month for taxpayers with an annual  turnover of> 1.5 crore 

Due by the 13th of the month after the quarter ends for taxpayers with an annual turnover of< 1.5crore 

GSTR-3B 

Due by the 20th of the next month 

Due by the 22nd or 24th of the month after the quarter, depending on your State/UT 

Note: The government may extend these dates through notifications. The GST portal also allows eligible taxpayers under the QRMP scheme to file GSTR-1 and GSTR-3B quarterly, with tax payments made monthly through a challan. 

Why Should GSTR-1 Be Filed Before GSTR-3B? 

Filing GSTR-1 before GSTR-3B is required by law under the CGST Act, 2017. As per the returns system, details from GSTR-1 auto-populate and flow into GSTR-3B, preventing data mismatches or redundancies. This allows you to extract and claim your ITC without delay, and reduces the chances of discrepancies between outward supply reporting and tax payment. 

How Can Errors Be Corrected in GSTR-1 and GSTR-3B? 

Ideally, you want to catch any GSTR-1 errors before you file GSTR-3B, since the two returns are tied together for the same tax period.   

But a missed invoice or a wrong detail entry in the current GSTR-1 doesn’t mean you’re stuck. You can use GSTR-1A to add or amend information as long as you do it after filing GSTR-1 and before GSTR-3B. Just keep in mind that GSTR-1A is optional, and you can use it only once per tax period. Once you've filed GSTR-3B for that period, that window closes.   

GSTR-3B, on the other hand, is more complicated and without any amendment options. If you discover an error afterwards, you'll need to make the correction in a future return period instead, following whatever rules and timelines apply at that time. 

What Happens If GSTR-1 or GSTR-3B Is Filed Late? 

Filing either return late can affect both compliance and reconciliation. If your GSTR-1 is late, it can mess with your buyers' ability to match input tax credit, since they're relying on the invoice details you've reported. And if GSTR-3B is delayed, you're looking at late fees, interest accruing on unpaid tax, and potentially getting stuck in the return-filing process.  

Also Read About: What is GSTN? 

Conclusion 

The difference between GSTR-1 and GSTR-3B goes beyond being procedural and has implications on the accuracy of taxes declared, ITC claimed, and GST filing itself. GSTR-1 has to correctly contain the information about outward supply, while GSTR-3B – the tax liability, ITC claimed and payment position for the reporting period. The proper sequence of filling those forms and reconciling them before filing will help businesses avoid any errors and additional notices.  

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FAQs

No, according to the CGST Act of 2017, one cannot file GSTR-3B unless GSTR-1 has already been filed because details of GSTR-1 automatically get reflected in GSTR-3B, thereby avoiding any mismatch or redundancy of data. 

In case there is more turnover as per GSTR-1 as compared to GSTR-3B, then it will lead to a mismatch of outward supplies as well as tax liability as declared. Taxpayer needs to consider the reconciliations of all the invoices, credit notes, amendments, etc., to check what is causing the discrepancy.

Yes, filing of nil GSTR-1 may become necessary if there are no outward supplies made by the registered taxpayer for a particular tax period. Filing of nil GSTR will keep the compliance status alive and avoid any penalties or late filings for other periods. 

No, it is not possible to revise GSTR-3B after filing the same. Any mistake if found at a later stage will require adjustments within the subsequent return periods. 

No, composition scheme dealers generally do not file regular GSTR-1 and GSTR-3B. They follow a separate compliance structure, which usually includes periodic tax payment through CMP-08 and annual return filing through GSTR-4, as applicable. 

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