GST HSN Code Rules for Turnover Up to 5 Crore & F&O Tax Guide (2026)

By FnOTax India Editorial Board · Updated 2026-05-29 · F&O Turnover

Source basis: This research draft is checked against listed official sources where available. It is educational guidance, not personalized tax advice.

GST HSN Code Rules for Turnover Up to 5 Crore & F&O Tax Guide (2026)

If you search the web for your exact GST query, you will notice something frustrating: all the top search results are completely irrelevant. Instead of answering your simple GST question, they start lecturing you about Income Tax Audits, Section 44AB, and F&O trading.

Let’s fix that immediately. We will first give you a direct, bilingual answer to your GST HSN code question. Then, because many GST-registered business owners also trade in F&O (which is why search engines get confused), we will provide the ultimate, 2026-accurate guide to F&O taxation.

The Direct Answer: GST HSN Codes for Turnover Up to ₹5 Crore

Your Question: “DONO HO OR TURNOVER UPTO 5 CRORE HO TAB KYA HUM KEWAL B2B SUPPLY KI HSN CODE DAL SAKTE HAI ?” (If I have both B2B and B2C supplies and my turnover is up to 5 crores, can I enter the HSN code only for B2B supplies?)

The Answer: Haan, bilkul. (Yes, absolutely.)

Under Notification No. 78/2020 – Central Tax (effective from April 1, 2021), the rules for reporting Harmonized System of Nomenclature (HSN) codes in your GSTR-1 are strictly based on your Aggregate Annual Turnover (AATO) in the preceding financial year.

Here is the exact legal breakdown:

1. Taxpayers with Turnover UP TO ₹5 Crores

If your turnover in the previous financial year was ₹5 Crores or less:

  • B2B Supplies (Business-to-Business): You must mandatorily declare a 4-digit HSN code on your tax invoices and in GSTR-1.
  • B2C Supplies (Business-to-Consumer): Reporting the HSN code is optional. You do not have to enter it if you don’t want to.

2. Taxpayers with Turnover ABOVE ₹5 Crores

If your turnover in the previous financial year crossed ₹5 Crores:

  • B2B & B2C Supplies: You must mandatorily declare a 6-digit HSN code for both B2B and B2C transactions.

Summary for your case: Since your turnover is up to ₹5 Crore, you are perfectly compliant if you only enter the 4-digit HSN code for your B2B supplies and leave it blank for your B2C supplies.

Why Do Search Engines Confuse GST Turnover with F&O Turnover?

Many retail traders run small businesses (like IT services or trading firms) where they hold a GST registration. When they start trading Futures & Options (F&O), they panic. They see massive “turnover” numbers in their brokerage accounts and worry it will trigger GST audits or push them over the ₹5 Crore GST HSN threshold.

Fact Check: F&O trading is a transaction in securities. Securities are explicitly excluded from the definition of “goods” and “services” under the CGST Act. Therefore, F&O turnover is NOT added to your GST turnover.

However, F&O turnover is critical for your Income Tax. Let’s clear up the massive misinformation online regarding F&O taxation for Assessment Year (AY) 2026-27.

The 2026 Ground Truth: F&O Income Tax Rules

If you are trading F&O, you are running a business according to the Income Tax Department. Here are the absolute, legally backed rules you must follow.

1. How to Calculate F&O Turnover (The ICAI Rule)

Forget the old rules. As per the ICAI 8th Edition Guidance Note on Tax Audit u/s 44AB (issued August 19, 2022), F&O turnover is calculated as: Sum of Absolute Profits + Sum of Absolute Losses for each trade. Note: The premium received on options writing is NOT added separately to this calculation anymore.

2. When is a Tax Audit Mandatory? (Section 44AB)

Traders are terrified of tax audits. Here is when you actually need one:

  • The Basic Threshold: Under Section 44AB(a), the base limit for a tax audit is ₹1 crore. However, this threshold is raised to ₹10 crore IF your cash receipts and cash payments each do not exceed 5% of total transactions. Since F&O is 100% digital, the ₹10 crore threshold effectively applies to all F&O traders.
  • The 44AD Presumptive Trap: Under Section 44AD, the presumptive taxation turnover limit was raised to ₹3 crore (effective FY 2023-24 onwards, assuming <5% cash).
  • The 5-Year Lock-in (Section 44AB(e) via 44AD(4)): If you opted for 44AD presumptive taxation in any of the last 5 years, and this year you opt out (because you made a loss or a profit margin below 6%), a tax audit becomes MANDATORY if your total income exceeds the basic exemption limit. You are also barred from re-entering 44AD for 5 years.

3. ITR Forms and Due Dates for AY 2026-27

  • Which Form? F&O traders must file ITR-3. You can only use ITR-4 if you are opting for 44AD presumptive taxation AND have no other ITR-3-only conditions (like total income > ₹50 lakh, capital gains, foreign assets, etc.).
  • Due Dates (Finance Act 2026 Updates):
    • ITR-3 (Non-Audit): Extended to 31 August 2026.
    • Tax Audit Report (Form 3CA/3CB-3CD): Due 30 September 2026.
    • ITR-3 (With Audit): Due 31 October 2026.

4. Penalties for Missing an Audit (Section 271B)

If you cross the ₹10 crore limit (or trigger the 44AD trap) and fail to get an audit, Section 271B applies. The penalty is 0.5% of turnover OR ₹1,50,000, whichever is LOWER. Important 2026 Update: The Finance Act 2026 converted this from a “penalty” to a “fee” status to reduce litigation, but the amount remains unchanged.

5. Setting Off and Carrying Forward F&O Losses

  • Classification: Under Section 43(5) proviso (d), F&O trading on a recognized stock exchange is classified as NON-speculative business income. (Intraday equity delivery is speculative).
  • Same Year Set-Off (Section 71): You can set off F&O losses against ANY income in the same financial year—EXCEPT Salary income. You can adjust it against rental income, interest, capital gains, or other business income.
  • Carry Forward (Section 72): If you still have unadjusted losses, you can carry them forward for 8 assessment years to set off against future business income. Crucial: You must file your ITR before the due date to preserve this benefit.

6. Maintaining Books of Account (Section 44AA)

You must maintain formal books of account if your business income exceeds ₹1.2 lakh OR your turnover exceeds ₹10 lakh in any of the last 3 years.

Worked Example: GST & F&O Combined

Let’s look at “Rahul”, a trader who also runs a GST-registered software consulting business.

Rahul’s FY 2025-26 Data:

  • Software Consulting (GST): ₹2.5 Crores (B2B: ₹2 Cr, B2C: ₹50 Lakhs)
  • F&O Trading: 500 trades. Total Absolute Profits = ₹4 Crores. Total Absolute Losses = ₹3 Crores.

Compliance Breakdown:

  1. GST HSN Rule: Rahul’s GST turnover is ₹2.5 Crores (Under ₹5 Cr). He must put a 4-digit HSN code on his ₹2 Cr B2B invoices. He can leave the HSN code blank on his ₹50 Lakhs B2C invoices.
  2. F&O Turnover: ₹4 Cr (Profits) + ₹3 Cr (Losses) = ₹7 Crores.
  3. Tax Audit Applicability: His total business turnover is ₹9.5 Crores (₹2.5 Cr + ₹7 Cr). Since this is below the ₹10 Crore digital threshold (and assuming he didn’t trigger the 44AD lock-in), Rahul does NOT need a tax audit.
  4. ITR Filing: He will file ITR-3 by 31 August 2026.

Frequently Asked Questions (FAQs)

Q1: Dono ho or turnover upto 5 crore ho tab kya hum kewal B2B supply ki HSN code dal sakte hai? A: Haan. As per Notification No. 78/2020 – Central Tax, if your aggregate turnover is up to ₹5 Crore, 4-digit HSN codes are mandatory only for B2B invoices. For B2C invoices, it is completely optional.

Q2: What is the HSN code rule if my turnover crosses ₹5 Crores? A: If your aggregate turnover in the preceding FY exceeds ₹5 Crores, you must mandatorily report 6-digit HSN codes for BOTH B2B and B2C supplies.

Q3: How is F&O turnover calculated for Income Tax in 2026? A: Per the ICAI 8th Edition Guidance Note (Aug 2022), F&O turnover is the sum of absolute profits and absolute losses. Options premium received is NOT added separately.

Q4: When is a tax audit mandatory for F&O trading? A: Under Section 44AB(a), the threshold is ₹10 crore since F&O is 100% digital. However, if you previously opted for 44AD presumptive taxation and opted out, Section 44AB(e) makes an audit mandatory for 5 years if your income exceeds the basic exemption.

Q5: Can I set off F&O losses against my salary income? A: No. Under Section 71, F&O losses (which are non-speculative business losses) can be set off against any income EXCEPT salary in the same financial year. They can be carried forward for 8 years under Section 72.

Disclaimer: The tax laws discussed herein are based on the Income Tax Act, 1961, CGST Act, 2017, and relevant Finance Act 2026 amendments. Tax laws are subject to change. Always consult a qualified Chartered Accountant before filing your returns or making tax-related decisions.

Official sources

Source basis: The references below point to the official Indian tax sources used to inform this article. The article has not completed our full source-verification review; treat it as educational guidance only and consult a qualified Chartered Accountant before acting on it.