Abhishek Verma on GSTR-1 vs GSTR-3B Mistakes

Abhishek Verma recently shared something that caught my attention: "Most GST notices start from one simple mistake: Confusing GSTR-1 with GSTR-3B." He followed it with an even sharper line: "I filed 3B and paid tax = compliance done" - "Wrong."

That is the kind of post that sounds obvious after you read it, but it captures a real, repeatable reason businesses receive notices: the numbers (and intent) in GSTR-1 and GSTR-3B are not the same thing, and treating them as interchangeable quietly creates mismatches.

In this blog, I want to expand on Abhishek's point in a practical, "what to do on the 20th" kind of way. If you file GST returns yourself, supervise a finance team, or review a client filing, this is one of those fundamentals that prevents a lot of avoidable pain.

"GSTR-1 builds the trail. GSTR-3B settles the money." - Abhishek Verma

The core confusion: reporting vs paying

Abhishek framed it perfectly by giving each return a one-line job description.

GSTR-1 is the sales reporting trail

GSTR-1 is the statement of outward supplies where you report invoice-level details. Think of it as the detailed sales register you are publishing to the GST ecosystem.

What typically sits in GSTR-1 (as Abhishek listed) includes:

B2B invoices (party-wise)
B2C large invoices, exports
Credit notes and debit notes
HSN summary (as applicable)

The most important downstream effect is this:

Your GSTR-1 data flows to your customer’s GSTR-2A/2B.

So when you report an invoice in GSTR-1, you are not just "telling the department". You are also lighting up your buyer’s ITC eligibility trail.

GSTR-3B is the tax payment summary

GSTR-3B is a summary return where you pay tax on a self-assessed basis. It is not invoice-by-invoice disclosure. It is where your output tax liability and ITC come together to produce net tax payable.

Abhishek highlighted the key anchors:

Output tax liability in Table 3.1
ITC claimed in Table 4
Net tax payable and payment

If GSTR-1 is the detailed story, GSTR-3B is the settlement.

Why mismatches trigger notices (and why they are so common)

The reason this mistake is so common is psychological as much as procedural. Many taxpayers treat the act of payment as the finish line. But GST compliance is also about consistency across disclosures.

Here is the exact real-life example Abhishek gave, expanded slightly so you can see the chain reaction.

The classic miss: invoice in GSTR-1, not in 3B

You raise an invoice:

Taxable value: Rs 1,00,000
GST (18%): Rs 18,000

You report it in GSTR-1 (correct).
But when preparing GSTR-3B, you forget to include it in Table 3.1 (incorrect).

Now the mismatch becomes visible to multiple parties:

Your customer sees the invoice in their GSTR-2B and may claim ITC.
The department sees tax reported in GSTR-1 but not paid through GSTR-3B.

That gap is exactly what notice risk thrives on: a reported supply without matching tax payment.

Due dates matter because timing mismatches look like short payment

Abhishek also called out due dates, which is where timing issues creep in even for honest taxpayers.

Typical due dates he shared:

GSTR-1: 11th (monthly) / 13th (quarterly)
GSTR-3B: 20th (monthly) / 22nd to 24th (QRMP)

Because these forms are filed on different dates (and sometimes by different people), you can end up with:

GSTR-1 filed correctly from the sales register
GSTR-3B filed from a separate summary sheet that is missing late invoices, debit notes, or amendments

Even if the miss is accidental and fixed later, the system sees a period where "reported" does not equal "paid".

The cost of getting this wrong is bigger than the tax

Abhishek listed the outcomes in blunt terms, and he is right to do so:

Short payment notice risk
Interest on tax (per day delay)
Late fee and compliance burden

Let me add context to each:

1) Short payment notice risk

Notices are not always an accusation of fraud. Many are triggered by mismatch logic. But responding still takes time, documentation, and professional fees.

2) Interest adds up quietly

Interest is painful because it applies even when you intended to pay and even when the miss is small relative to turnover. A few missed invoices each month can turn into a steady interest leak.

3) The operational cost is real

Once a notice arrives, you shift from "filing" to "defending": extracting registers, reconciling periods, drafting replies, and ensuring the fix does not create another mismatch next month.

A simple monthly reconciliation habit (the 10-minute version)

The best part of Abhishek’s post is that it ends with a habit, not just a warning. He suggested a quick monthly check that can prevent most of these issues.

Step 1: Match GSTR-1 taxable value vs GSTR-3B Table 3.1

You are trying to answer one question: Did I pay tax on everything I reported as outward supply?

Practical approach:

Export GSTR-1 summary for the period (taxable value and tax)
Compare it to GSTR-3B Table 3.1 (taxable value and tax)
Investigate differences

Common legitimate reasons for differences (which still need tracking):

Amendments or credit notes reported in one period and adjusted in another
Advances and their adjustments
Zero-rated exports vs taxable domestic supplies
RCM items (not outward supply) incorrectly included in a comparison sheet

The goal is not "numbers must always match perfectly". The goal is "every difference has a documented reason and a planned correction".

Step 2: Match GSTR-2B ITC vs GSTR-3B Table 4

Abhishek also recommended comparing ITC visible in 2B to ITC claimed in 3B.

This helps you spot:

Missed ITC (eligible credits not claimed)
Ineligible ITC mistakenly claimed
Vendor compliance issues (invoice not appearing in 2B)

Even when you choose to claim less than 2B (for prudence), document the reason so you can claim later without confusion.

What to do if you find a mismatch

Abhishek’s call to action was clear: "Open your last month filing right now. If GSTR-1 tax > GSTR-3B tax, mark the month as RISK and fix in next return cycle."

Here is a clean way to execute that:

Identify the exact documents causing the gap

List invoice numbers, dates, taxable value, and GST
Check whether it is a pure omission or a classification issue

Decide the correction route

If output tax was underreported in 3B, include it in the next 3B as per applicable rules and process
If the issue is timing (amendment, credit note), keep a reconciliation note that ties periods together

Create a one-page "return tie-out" file for the month
Include:

GSTR-1 summary
GSTR-3B Table 3.1 summary
GSTR-2B ITC summary
GSTR-3B Table 4 summary
Explanations for differences

That one page often becomes your fastest defense if a query arrives later.

The bigger takeaway: treat GST returns like a system, not two separate tasks

What I like about Abhishek Verma’s framing is that it is memorable and operational:

GSTR-1 is your outward supply disclosure trail
GSTR-3B is your tax settlement

When teams treat them as two different jobs owned by two different spreadsheets, mismatches are inevitable. When teams treat them as two views of the same month-end close, notices drop dramatically.

If you do just one thing this month, do Abhishek’s 10-minute check. It is simple, not glamorous, and it works.

This blog post expands on a viral LinkedIn post by Abhishek Verma. View the original LinkedIn post →