GST (Goods and Services Tax) has transformed India’s indirect tax landscape by bringing together multiple taxes under one unified system. But for professionals, GST interviews are not just about knowing tax rates or return forms — they test how you apply your understanding in real business situations.
Recruiters want to know how you would respond when a supplier forgets to upload invoices, when there’s a mismatch in GSTR-2B, or when a refund claim gets rejected. Your ability to interpret the law practically, handle errors, and maintain compliance under deadlines is what truly matters.
This blog compiles the Top 50 Scenario-Based GST Interview Questions and Answers that reflect everyday challenges faced by accountants, tax executives, and finance professionals. Each question helps you think through real-world problems — from registration and input tax credit to audits, refunds, and ethical decisions — so that you can answer confidently and professionally in any GST-related interview.
Target Audience
This blog is designed for anyone who wants to strengthen their practical understanding of GST and prepare effectively for job interviews in taxation and finance. It will be especially useful for:
- Commerce and accounting graduates preparing for entry-level roles in taxation and compliance.
- Chartered Accountancy (CA) and Cost Accounting students looking to enhance their scenario-based GST knowledge.
- Tax professionals and consultants who handle client GST returns, reconciliations, or audits.
- Finance executives and accountants in corporates who deal with GST filings, vendor reconciliations, or refund claims.
By practicing these scenario-based questions, you will learn how to explain your reasoning clearly, apply the right GST provisions, and handle practical challenges like mismatched returns, input credit issues, and departmental notices with confidence and accuracy.
Section 1 : GST Registration and Applicability Scenarios
Q1. A trader providing both goods and services has an annual turnover of ₹35 lakh. Is GST registration required?
Answer: Yes, registration is required because the aggregate turnover includes both goods and services, and the threshold for mixed supplies is ₹20 lakh (₹10 lakh for special category states).
Q2. A business operates in Delhi and supplies goods to Haryana without any branch there. Is registration needed in Haryana?
Answer: No, registration is not required in Haryana since the supply is interstate. The business only needs to charge IGST from Delhi and maintain registration in the originating state.
Q3. A company provides online consultancy services to clients outside India. Is GST applicable?
Answer: No, it is treated as an export of services if payment is received in convertible foreign exchange and the recipient is located outside India. Such supplies are zero-rated under GST.
Q4. A small restaurant with turnover below ₹1.5 crore wants to opt for the Composition Scheme. Is it eligible?
Answer: Yes, restaurants (excluding those serving alcohol) can opt for the Composition Scheme if their turnover is up to ₹1.5 crore and they pay tax at 5% without availing ITC.
Q5. A company provides services only to SEZ units. Does it need GST registration?
Answer: Yes, since supplying to SEZ units counts as inter-state supply, registration under GST is mandatory irrespective of turnover.
Q6. A manufacturing unit shifts its place of business to another state. What happens to its GST registration?
Answer: The existing registration must be cancelled, and a new registration must be obtained in the new state since GST is state-specific.
Q7. A business buys goods from an unregistered supplier. What should it do under Reverse Charge Mechanism (RCM)?
Answer: The recipient must pay GST under RCM, issue a self-invoice, and claim ITC for the tax paid, provided the goods are used for business purposes.
Q8. A freelancer earns ₹22 lakh annually providing design services. Is GST registration mandatory?
Answer: Yes, because the threshold limit for service providers is ₹20 lakh (₹10 lakh in special category states).
Q9. A company sells goods online through an e-commerce platform. Does it need separate registration for e-commerce activities?
Answer: No, but it must mention “E-commerce operator supplies” in its GST registration and comply with TCS (Tax Collected at Source) provisions under Section 52.
Q10. A business was previously under VAT and has now migrated to GST. Does it need to apply for fresh registration?
Answer: No, businesses registered under VAT were automatically migrated to GST through provisional IDs. They only need to complete the GST migration process and verify details on the GST portal.
Section 2 : Input Tax Credit (ITC) Scenarios
Q11. A company purchased goods in March but received the tax invoice in April. In which month can ITC be claimed?
Answer: ITC can be claimed only in April, the month when the invoice is received and the goods are delivered, as per Section 16(2) of the CGST Act.
Q12. You find an invoice missing from GSTR-2B, though the supplier has uploaded it in GSTR-1. Can you still claim ITC?
Answer: No, ITC can be claimed only when the invoice appears in GSTR-2B. You must contact the supplier to correct the upload in the next return cycle.
Q13. Your company purchased air-conditioners for office use. Can ITC be claimed?
Answer: No, ITC on goods used for personal comfort or office infrastructure (like ACs, furniture, or pantry items) is blocked under Section 17(5) of the CGST Act.
Q14. ITC was claimed on a supplier invoice, but the supplier did not pay GST to the government. What is the implication?
Answer: The recipient is liable to reverse the ITC and pay interest until the supplier pays the tax, as per Section 16(2)(c).
Q15. A vehicle is purchased for business transport of goods. Is ITC allowed?
Answer: Yes, ITC is allowed when the vehicle is used for transporting goods, as blocked credit restrictions apply mainly to passenger vehicles.
Q16. A taxpayer mistakenly claimed excess ITC in GSTR-3B. How can this be corrected?
Answer: The excess ITC must be reversed in the next month’s GSTR-3B return with applicable interest.
Q17. Goods were received in three lots but the invoice was received with the first delivery. When can ITC be claimed?
Answer: ITC can only be claimed upon receipt of the final lot, as per Section 16(2)(b).
Q18. The supplier issued a debit note after six months of the financial year. Can the recipient claim ITC on it?
Answer: Yes, ITC can be claimed up to 30th November of the following financial year or before filing the annual return, whichever is earlier.
Q19. ITC was claimed for a service later used for exempt supplies. What should you do?
Answer: Reverse the ITC proportionately as per Rule 42 of the CGST Rules and pay applicable interest.
Q20. You find ITC on capital goods used partly for personal use and partly for business. How should it be handled?
Answer: Claim ITC proportionately only for the business portion, as personal-use credits are not allowed under Section 17(1).
Section 3 : Return Filing and Compliance Scenarios (10 Questions)
Q21. You accidentally reported outward supplies in the wrong month’s GSTR-1. How can you correct it?
Answer: Amend the invoice details in the next month’s GSTR-1 using the “Amendment” section, ensuring that the corrected values match the GSTR-3B filing for reconciliation.
Q22. The accountant filed a nil GSTR-3B for July even though there were transactions. What should you do now?
Answer: Since returns cannot be revised, include the missed invoices in the next GSTR-3B and pay the due tax along with interest under Section 50 of the CGST Act.
Q23. GSTR-3B was filed with less tax than payable due to a calculation error. What is the remedy?
Answer: Pay the shortfall immediately through Form DRC-03 along with interest for delayed payment and retain all supporting working papers for audit reference.
Q24. A company files GSTR-3B regularly but missed filing GSTR-1 for two months. What will be the impact?
Answer: GSTR-1 non-filing leads to mismatch in recipient’s GSTR-2B, blocking ITC for buyers. File pending GSTR-1 immediately to ensure smooth ITC flow and avoid penalties.
Q25. What happens if GSTR-3B is filed but payment is not made?
Answer: The return will be treated as invalid until payment is completed. Interest and late fees will apply, and ITC utilisation will not be processed.
Q26. A business failed to claim ITC on certain invoices within the financial year. Can it be claimed later?
Answer: ITC can be claimed up to 30th November of the following financial year or before filing the annual return, whichever is earlier.
Q27. How will you handle a GSTR-2B mismatch with purchase register?
Answer: Identify missing or duplicate entries, communicate with suppliers for corrections, reconcile the differences, and adjust claims in the next GSTR-3B filing.
Q28. GSTR-3B for August was filed after the due date. What is the penalty?
Answer: Late filing attracts a late fee of ₹50 per day (₹20 per day for nil returns) plus 18% annual interest on the tax payable from the due date till actual filing.
Q29. You discover an input credit reversal was missed in a previous month. How can you correct it?
Answer: Reverse the ITC in the current month’s GSTR-3B, pay the tax with interest, and record the adjustment for audit compliance.
Q30. How do you correct a wrongly uploaded B2C invoice as B2B in GSTR-1?
Answer: Amend the invoice in the next GSTR-1 return under the “B2B amendment” section and correctly classify it as B2C to avoid ITC mismatches for other taxpayers.
Section 4 : GST Invoicing and E-Invoicing Scenarios
Q31. A business eligible for e-invoicing forgets to generate an IRN before dispatching goods. What happens?
Answer: The invoice issued without an IRN is invalid under GST. The supply is considered non-compliant, and ITC to the recipient may be denied. The taxpayer must generate a valid e-invoice immediately or issue a credit note and fresh invoice with IRN.
Q32. An e-invoice was generated but needs to be cancelled after 48 hours. What is the solution?
Answer: Cancellation is only allowed within 24 hours on the portal. After that, the taxpayer must issue a credit note to nullify the original invoice and report it in the next return.
Q33. A company mistakenly issued a tax invoice instead of a bill of supply for exempt goods. How can this be rectified?
Answer: Issue a credit note against the tax invoice and re-issue a correct bill of supply. Ensure the mistake is reflected properly in the next GSTR-1 filing to maintain accurate liability reporting.
Q34. The customer returns goods after 45 days of sale. How will you record it under GST?
Answer: Issue a credit note referencing the original invoice, reduce output tax liability in GSTR-3B, and adjust the same in GSTR-1 within the time limit prescribed under Section 34 of the CGST Act.
Q35. During transport, an e-way bill expires before goods reach the destination. What should you do?
Answer: The movement should be stopped at a safe location, and the e-way bill must be extended on the portal citing valid reasons such as vehicle breakdown or delay.
Q36. An exporter forgets to mention the LUT (Letter of Undertaking) number on the export invoice. Will it affect zero-rated supply?
Answer: No, zero-rating remains valid if LUT is filed for that financial year. However, the LUT details must be mentioned in future invoices and returns for audit clarity.
Q37. A recipient identifies a mismatch in tax rate between invoice and purchase order. What should be done?
Answer: The supplier must issue a debit or credit note to correct the tax rate. The recipient should claim or reverse ITC accordingly to ensure both books match.
Q38. How should an advance payment received for future supply be invoiced?
Answer: Issue a receipt voucher at the time of receiving the advance, pay GST on it, and adjust the same against the final invoice once the supply is made.
Q39. A B2C invoice was mistakenly uploaded as B2B in GSTR-1. How can this be corrected?
Answer: Amend the invoice in the next GSTR-1, reclassify it as B2C, and ensure that the erroneous invoice is not reflected in any recipient’s GSTR-2B.
Q40. The transporter is caught without an e-way bill during transit. What are the consequences?
Answer: Goods and vehicle may be detained, and a penalty equal to 200% of the tax payable may be imposed. The e-way bill should always accompany movement of goods exceeding ₹50,000 in value.
Section 5 : GST Audit, Refunds, and Assessment Scenarios
Q41. During a departmental audit, it is found that ITC was claimed twice on the same invoice. What should you do?
Answer: Voluntarily reverse the duplicate ITC in the current GSTR-3B and pay applicable interest under Section 50. Keep documentation ready to prove that the error has been rectified before issuance of any demand notice.
Q42. A company exported goods but forgot to file LUT (Letter of Undertaking). Can it still claim a refund of IGST?
Answer: Yes, the company can pay IGST on exports and later claim a refund. However, without LUT, the supply won’t qualify as zero-rated, so tax must first be paid and then refunded upon verification.
Q43. The GST department issues a notice for mismatched turnover between GSTR-3B and annual return. How will you handle it?
Answer: Reconcile GSTR-1, GSTR-3B, and books of accounts to identify the cause. Submit a written clarification with reconciliation statements, paying any shortfall if applicable, along with interest.
Q44. A refund application for export services was rejected citing “deficiency in documents.” What’s the next step?
Answer: Correct the deficiencies, attach missing supporting documents (invoices, FIRC, LUT, etc.), and re-file the refund claim within the prescribed time limit using Form RFD-01.
Q45. Your client’s refund claim is stuck because the supplier hasn’t filed GSTR-1. What can be done?
Answer: Request the supplier to file GSTR-1 immediately so that the transaction reflects in GSTR-2B. Refund claims are processed only after system matching of data.
Q46. How would you handle a GST audit query on ITC claimed for capital goods used in both taxable and exempt supplies?
Answer: Recalculate eligible ITC as per Rule 43 of CGST Rules, reverse the proportionate ineligible credit, and pay interest on the reversed amount, if due.
Q47. A taxpayer receives a show cause notice (SCN) for delayed payment of GST. What’s your response strategy?
Answer: File a detailed reply within the prescribed time, attaching payment proof, computation details, and explanation for delay. Seek personal hearing if clarification is needed.
Q48. The auditor detects that GST was paid under the wrong head (CGST instead of IGST). How do you correct it?
Answer: File Form PMT-09 to transfer the amount from the incorrect tax head to the correct one and ensure the ledger reflects accurate liability adjustment.
Q49. An advance refund claim was processed, but later excess refund was received. How should this be handled?
Answer: Voluntarily repay the excess refund amount through Form DRC-03 to avoid penalty and interest, along with an explanatory letter to the jurisdictional officer.
Q50. A company’s GST assessment reveals discrepancies in sales invoices versus GSTR-1. What should be done?
Answer: Prepare a reconciliation statement, pay the differential tax with interest, and ensure all corrections are reflected in the subsequent GSTR-1 and annual return to maintain consistency.
Section 6 : Bonus Questions – Practical Decision-Making and Ethics
Q51. Your manager instructs you to claim ITC for invoices not appearing in GSTR-2B to meet monthly targets. What will you do?
Answer: Politely explain that claiming ITC not reflected in GSTR-2B violates Section 16(2)(aa) of the CGST Act and can attract penalties. Recommend waiting for the supplier to file GSTR-1 or correcting the mismatch in the next period to ensure legal compliance.
Q52. A client asks you to backdate an invoice to avoid interest on tax liability. How will you respond?
Answer: Refuse the request, explain that backdating constitutes falsification of records under Section 122, and suggest filing the return with accurate dates and paying minimal interest instead.
Q53. You realize after filing that a computation mistake has led to underpayment of tax. What should you do?
Answer: Voluntarily pay the shortfall using Form DRC-03, include a clear narration of the error, and retain proof of correction to demonstrate transparency during audit or scrutiny.
Q54. You are handling GST filings for multiple clients, and one insists on claiming input on personal expenses. How will you manage this professionally?
Answer: Clarify that personal expenses are not eligible under Section 17(1), and claiming them amounts to fraudulent credit. Educate the client on compliance risks and document your professional advice to protect your liability.
Q55. During departmental audit, an officer informally asks for a “facilitation fee” to clear your client’s file. How will you act?
Answer: Decline immediately, maintain professionalism, and report the incident to higher authorities or the vigilance department. Integrity and compliance with the law must be prioritized over convenience or personal gain.
How to Prepare for a GST Professional Interview?
Landing a job that involves GST (Goods and Services Tax) means you need to show both conceptual understanding and practical awareness. Employers expect you to know the fundamentals of GST law, filing procedures, returns, and how GST impacts business operations. Beyond memorizing rules, you should be able to explain real-life applications—like how to handle GST on exports, reverse charge mechanisms, or input tax credits.
A smart preparation strategy combines conceptual clarity, updated knowledge of GST amendments, and hands-on familiarity with tools like GSTN, Tally, or Excel for return filing. Here’s a simple yet structured approach to help you prepare confidently:
| Preparation Area | What to Focus On | How to Prepare | Outcome Expected |
|---|---|---|---|
| GST Basics & Framework | Understand the GST structure, key terms, and tax slabs. | Study official GST portal resources, government FAQs, and Vskills/GST training material. | You’ll confidently explain what GST is and how it functions. |
| GST Registration & Returns | Learn how businesses register and file returns (GSTR-1, GSTR-3B, etc.). | Practice filing mock returns or explore GSTN demos. | You can walk an interviewer through return filing steps. |
| Input Tax Credit (ITC) | Understand eligibility, restrictions, and reconciliation process. | Go through ITC rules and case studies. | You’ll handle practical ITC questions easily. |
| Reverse Charge Mechanism (RCM) | Learn when RCM applies and how it’s accounted for. | Read examples from small businesses and service providers. | You can explain RCM scenarios clearly. |
| Recent Updates & Amendments | Keep track of latest notifications, rates, and procedural changes. | Follow CBIC updates and GST newsletters. | You appear current and industry-aware. |
| Practical Application | Know how GST applies to invoices, exports/imports, and e-way bills. | Review sample invoices and audit reports. | You can answer scenario-based questions confidently. |
| Common Interview Questions | Prepare for conceptual and situational questions. | Practice mock interviews and review GST Q&A lists. | You’ll sound prepared, not rehearsed. |
| Tools & Software | Get comfortable with GSTN portal, Excel, and Tally. | Try hands-on practice using tutorials or free trial versions. | You show readiness for real-world tasks. |
Final Thoughts
GST interviews are designed to test not just your technical command over the law but also your ability to think ethically and act responsibly in real-world business situations. These Top 50 Scenario-Based GST Interview Questions and Answers prepare you to handle every aspect of GST — from registration and ITC reconciliation to audits and refunds — with confidence and accuracy.
Mastering these scenarios will help you demonstrate both legal knowledge and practical judgment, two qualities every employer values in a tax professional.
