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🎓 Advanced Topics — GST Reference Notes

IndIaTaxSim · indiataxsim.com · Free Study Materials · For educational use only
1. Reverse Charge Mechanism (RCM)

Under the normal GST mechanism, the supplier pays tax. Under RCM (Reverse Charge Mechanism), the LIABILITY to pay tax shifts from the supplier to the recipient (buyer). The buyer pays GST directly to the government instead of to the supplier.

Why RCM Exists:
To capture tax on supplies from unregistered suppliers
To tax specific categories where supplier compliance is difficult (advocates, GTA)
To prevent revenue leakage in high-risk sectors
Supply Attracting RCMSupplierTax Paid By (Recipient)
Legal services by an AdvocateIndividual AdvocateAny registered business recipient
Goods Transport Agency (GTA) serviceGTA (transporters)Factory, registered persons, companies, societies
Services by Director to companyDirector (individual)Company (recipient)
Security servicesRegistered security agencyRegistered recipient (except government)
Renting of motor vehicles (with operator)Any supplierCompanies, registered persons
Services from unregistered supplier to registered recipientUnregistered personRegistered recipient (for notified goods)
Import of servicesForeign supplierIndian registered recipient (always RCM)
📌 Example
A manufacturer hires a truck from a GTA to transport goods from factory to warehouse — ₹50,000 freight. GTA does not charge any GST. The manufacturer must:
• Pay GST at 12% on ₹50,000 = ₹6,000 (under RCM) directly to the government
• Declare ₹50,000 in GSTR-3B Section 3.1(b) as RCM supply
• Pay ₹6,000 from Cash Ledger (cannot use ITC to pay RCM tax)
• Claim ₹6,000 as ITC in Section 4(A)(2/3) in the same return (if eligible for ITC)
2. Input Service Distributor (ISD)

An ISD is a head office or registered office that:

Receives invoices for common services used across multiple branches / GSTINs
Distributes the ITC to each branch proportionally
FeatureISD Rule
Separate GSTIN needed?YES — ISD has its own GSTIN
Return filedGSTR-6 — monthly by 13th of following month
Distribution keyTurnover of each branch / Total turnover of all branches (for the month)
ITC distributed asIGST or CGST+SGST (depending on source)
Branch claims ITC fromGSTR-2B (shows ISD credit as Part A3)
📌 Example
ABC Company (head office Mumbai) receives a ₹10 lakh IT maintenance invoice benefiting Mumbai, Delhi, and Chennai branches. Turnovers: Mumbai = ₹50L, Delhi = ₹30L, Chennai = ₹20L. Total = ₹1 crore.
GST on invoice = ₹1,80,000 (18%).
ITC distributed: Mumbai = 50% = ₹90,000 | Delhi = 30% = ₹54,000 | Chennai = 20% = ₹36,000.
3. Blocked Credits — Section 17(5) — Detailed Analysis
Blocked ItemSectionException (ITC Available If…)
Motor vehicle ≤13 seats17(5)(a)Used for: transport of persons for hire (taxi), used in driving school, used for supply of such vehicles
Other conveyances (vessels, aircraft)17(5)(aa)Used for transport of persons/goods for hire or further supply
Food, beverages, outdoor catering17(5)(b)(i)Supplier provides outdoor catering as a business service
Club membership, fitness centre17(5)(b)(ii)No exception
Rent-a-cab17(5)(b)(iii)Obligatory under law OR for employees' benefit (employer-provided)
Life insurance, health insurance17(5)(b)(iv)Mandatory under statute
Pipelines, telecom towers, civil structures17(5)(c/d)Plant and machinery (not building, road, dam, or civil structure)
Works contract for construction17(5)(c)Plant and machinery — NOT for immovable property
4. ITC Reversal — 180-Day Rule (Section 16(2))
🔢 Formula
Rule: If a recipient has not paid the INVOICE VALUE (including GST) to the supplier within 180 days of the invoice date, the ITC must be reversed.
Reversal amount = ITC originally claimed on that invoice
After reversal: ITC goes back to the output liability (the recipient must pay it in cash or from future ITC).
Re-credit: Once the recipient makes payment to the supplier, the reversed ITC can be re-claimed in the GSTR-3B of the payment period (Section 4 → re-credit).
Interest: On the reversed ITC, interest at 18% per annum from the period of original claim to the reversal date.
📌 Example
Invoice dated 1 July 2024 for ₹5,00,000 + IGST ₹90,000. ITC of ₹90,000 claimed in July 2024.
Payment not made by 27 December 2024 (180 days from 1 July).
Taxpayer must reverse ₹90,000 ITC in December 2024 GSTR-3B + pay interest from August 2024 to December 2024 (approximately 5 months at 18% = ₹90,000 × 18%/12 × 5 = ₹6,750).
When paid to supplier in March 2025 — ₹90,000 ITC can be re-claimed in March 2025 GSTR-3B.
5. GSTR-2B Reconciliation — Full Workflow
StepActivityKey Check
1Download GSTR-2B (JSON/Excel)All accepted invoices
2Download your Purchase RegisterAll your inward invoices for the month
3Match GSTIN + Invoice No + DateAny mismatch → investigate
4Match Taxable ValueDifference > ₹1 → investigate (rounding errors are common)
5Check Blocked CreditsIdentify any ITC on blocked items — do NOT claim
6Identify invoices in PR not in 2BSupplier did not file GSTR-1 → follow up
7Identify invoices in 2B not in PRWrong GSTIN used → reject in IMS
8Update GSTR-3BClaim only reconciled ITC
9Document the reconciliationKeep for audit — 8 years
6. DRC-01B — Automated Mismatch Notice
TriggerGSTN auto-generates DRC-01B when GSTR-3B ITC > GSTR-2B ITC for any period
Response Window7 days from notice generation date
Response OptionsA) Agree — reverse excess ITC + pay interest 18% from GSTR-3B filing date B) Disagree — upload reconciliation statement and explanation with supporting documents
Consequence of no responseSection 74 proceedings for fraud / wilful evasion — penalty up to 100% of tax
❓ Problem
A manufacturer receives a ₹10 lakh invoice for plant equipment (capital goods) that will be used 60% for taxable supplies and 40% for an exempt supply (a product that is GST-exempt). GST on invoice = ₹1,80,000. How much ITC can be claimed?
✅ Solution
Under Rule 43, ITC on capital goods used for both taxable and exempt supplies must be split proportionally.
Total ITC on invoice = ₹1,80,000.
ITC attributable to taxable supplies = 60% × ₹1,80,000 = ₹1,08,000 → CLAIMABLE.
ITC attributable to exempt supplies = 40% × ₹1,80,000 = ₹72,000 → BLOCKED / REVERSED.
The manufacturer claims ₹1,08,000 and reverses ₹72,000 in GSTR-3B Section 4(B)(1).
❓ Problem
A company pays legal fees of ₹5,00,000 to an external law firm (a partnership firm of advocates). GST rate = 18%. Who pays the GST and how?
✅ Solution
Under RCM, legal services from an advocate firm are covered. The RECIPIENT (the company) pays GST — not the law firm.
GST = 18% × ₹5,00,000 = ₹90,000.
The company pays ₹5,00,000 to the law firm (without GST — the firm does not charge GST on this).
The company separately pays ₹90,000 IGST (or CGST+SGST if intra-state) under RCM to the government via Cash Ledger.
The company declares this in GSTR-3B Section 3.1(b) and simultaneously claims ₹90,000 ITC in Section 4 (if eligible and not blocked).
✏️ MCQ Practice — 50 Questions
1.RCM (Reverse Charge Mechanism) means:
(A) Supplier charges GST and buyer pays (B) Buyer is liable to pay GST directly to the government instead of the supplier (C) GST is reversed on exports (D) Tax is charged at half rate
2.Under RCM, can the buyer use ITC to pay the RCM tax liability?
(A) Yes — ITC from Credit Ledger can be used (B) No — RCM must be paid from Cash Ledger only (C) Yes, but only IGST ITC (D) Only if the buyer is an exporter
3.After paying RCM tax from Cash Ledger, the buyer can claim ITC on RCM:
(A) Never (B) Immediately in the same period (if eligible and not blocked) (C) After 3 months (D) Only in annual return GSTR-9
4.Which service attracts mandatory RCM when provided by a GTA (Goods Transport Agency)?
(A) GTA providing to unregistered individual consumers (B) GTA providing to registered recipients (companies, firms, etc.) (C) GTA providing to composition dealers only (D) GTA providing to exporters only
5.Legal services provided by an advocate firm to a registered business attract RCM. Who pays the GST?
(A) The advocate firm (B) The business (recipient) pays GST under RCM (C) Both split 50-50 (D) No GST on legal services
6.Import of services is ALWAYS subject to RCM if the Indian recipient is:
(A) An individual consumer (B) A registered taxable person (C) A government department (D) A composition dealer
7.Section 9(3) of CGST Act authorises RCM on:
(A) All supplies (B) Specific notified categories of goods and services (C) Only agricultural products (D) Only services
8.Section 9(4) of CGST Act authorises RCM on:
(A) Notified goods/services (specific categories) (B) Inward supplies from unregistered persons to registered recipients (for notified goods) (C) Export supplies (D) All inward supplies from registered persons
9.ISD (Input Service Distributor) is used when:
(A) A taxpayer distributes goods from a warehouse (B) A head office receives common service invoices and distributes the ITC to multiple branch GSTINs (C) A manufacturer has multiple production units (D) An exporter distributes ITC refund to partners
10.ISD files which return?
(A) GSTR-1 (B) GSTR-3B (C) GSTR-6 — by 13th of the following month (D) GSTR-9
11.ITC distributed by ISD to branches appears in the branch's GSTR-2B under:
(A) Part A (supplier invoices) (B) Part A3 — ISD credit (C) Part C — TDS/TCS (D) Part D — imports
12.The ISD distribution key (apportionment of ITC) is based on:
(A) Equal distribution to all branches (B) Turnover of each branch / total turnover of all branches for the period (C) Number of employees in each branch (D) Number of invoices at each branch
13.Section 17(5) of CGST Act lists credits that are "blocked" (not available). Which is an example?
(A) ITC on plant and machinery used for manufacturing (B) ITC on motor vehicles (≤13 seats) used for personal transport (C) ITC on raw materials for production (D) ITC on office laptops used for business
14.The 180-day rule under Section 16(2) requires ITC reversal if:
(A) Supply is not received within 180 days (B) The invoice is not paid to the supplier within 180 days from invoice date (C) The buyer does not accept in IMS within 180 days (D) GSTR-2B is not available within 180 days
15.After 180-day ITC reversal, the buyer can reclaim ITC when:
(A) They file GSTR-9 (B) The invoice is actually paid — re-claim in the period of payment (C) After 1 year (D) Only if the supplier files GSTR-1A
16.Rule 42 applies to ITC reversal for:
(A) Capital goods used partly for exempt supplies (B) Inputs and input services used partly for non-business / exempt supplies (proportion-based) (C) Non-payment of invoice within 180 days (D) Blocked credits under 17(5)
17.Rule 43 applies to ITC reversal for:
(A) Inputs used for exempt supplies (B) Capital goods used partly for exempt / non-business use (annual adjustment via GSTR-9) (C) Non-payment within 180 days (D) Section 17(5) items
18.The formula for annual ITC reversal on capital goods (Rule 43) involves:
(A) 5% of ITC per quarter of useful life (B) 5% per quarter of the total ITC on capital goods (20% per year over 5 years usage) (C) Simple proportion of exempt vs taxable turnover (D) Full reversal in year 1 if any exempt use
19.DRC-01C is a notice related to:
(A) Excess ITC in GSTR-3B over GSTR-2B (B) Annual return discrepancy (C) Non-filing of GSTR-1 (D) Fraudulent export refund
20.DRC-01B differs from DRC-01C in that:
(A) DRC-01B is about GST evasion; DRC-01C is for ITC mismatch (B) DRC-01B is for ITC mismatch with GSTR-2B; DRC-01C is for ITC mismatch between GSTR-3B and GSTR-2B (excess ITC) (C) They are the same notice (D) DRC-01B is issued by officer; DRC-01C is system-generated
21.GSTR-2B reconciliation identifies which categories of invoices?
(A) Matching (in both records and GSTR-2B), missing in books, and missing in GSTR-2B (supplier not filed) (B) Only matched invoices (C) Only mismatched invoices (D) Only exported invoices
22.The "inverted duty structure" refund applies when:
(A) Export exceeds domestic supply (B) Input tax rate is HIGHER than output tax rate (ITC accumulates and cannot be used) (C) ITC exceeds tax payable (D) Turnover crosses ₹5 crore
23.Refund of accumulated ITC due to exports (zero-rated supplies) is applied for via:
(A) GSTR-3B (B) RFD-01 on GST portal (C) GSTR-9C (D) Directly by officer
24.The "place of supply" determines whether a supply is inter-state or intra-state. For determining IGST vs CGST+SGST:
(A) If place of supply = supplier's state → CGST+SGST (intra-state) (B) If place of supply ≠ supplier's state → IGST (inter-state) (C) Both of the above are correct (D) Only A is correct
25.Under GST, "works contract" is treated as:
(A) Composite supply of goods and services (B) Service only — taxed entirely as service under GST (C) Goods only — taxed at goods rate (D) Not taxable under GST
26.GST on works contract for construction of immovable property is:
(A) 5% (B) 12% (C) 18% (D) 28%
27.ITC on works contract services for construction of building is:
(A) Allowed fully (B) Blocked — Section 17(5)(c) — except for plant and machinery (C) Allowed at 50% (D) Allowed only for commercial properties
28.Zero-rated supply under GST includes:
(A) Nil-rated and exempt supplies (B) Exports and supplies to SEZ (with or without payment of IGST) (C) Composition dealer supplies (D) Agriculture produce
29.Nil-rated supply under GST means:
(A) Taxable but at 0% (B) Specifically listed in GST schedule as attracting 0% GST (C) Exempt from GST and cannot claim ITC (D) Zero-rated for exports only
30.The difference between nil-rated and exempt supply:
(A) Same — no difference (B) Nil-rated = listed in the GST rate schedule at 0%; Exempt = specifically exempted under Section 11 (C) Exempt suppliers cannot register; nil-rated can (D) Nil-rated is for goods only; exempt is for services
31.Section 16(4) of CGST Act restricts claiming ITC beyond:
(A) March 31 of the current FY (B) November 30 of the next FY (due date of GSTR-9) or the actual filing date, whichever is earlier (C) GSTR-3B due date of the same month (D) 5 years from invoice date
32.Blocked credit under Section 17(5) on rent-a-cab (without employee obligation) is:
(A) Allowed if vehicle is owned by the company (B) Blocked — ITC not available on rent-a-cab for employees unless obligatory by law (C) Allowed at 50% (D) Allowed only for manufacturing companies
33.ITC on health insurance premium paid for employees is:
(A) Allowed — employee welfare (B) Blocked under Section 17(5)(b)(iv) unless compulsory by law (C) Allowed at 50% (D) Only allowed for companies with >100 employees
34."Anti-profiteering" provisions in GST require that when GST is reduced on a product:
(A) Company can retain the benefit as profit (B) Benefit must be passed on to the consumer by reducing price (C) Only retailers must comply (D) The provision was removed in 2022
35.GST on renting of immovable property for commercial purpose is:
(A) Exempt (B) 5% (C) 18% (D) 12%
36.Import of goods in India is taxed under:
(A) Only IGST (B) IGST + Basic Customs Duty (separately) (C) CGST + SGST (D) No GST on imports
37.ITC on import of goods (IGST paid at customs) is available:
(A) Only after GSTR-2B shows it (B) Based on Bill of Entry — taxpayer claims in GSTR-3B using Bill of Entry reference (C) After GSTR-9 filing (D) After 3 months from import date
38.E-commerce operator liable to pay GST under Section 9(5) (e.g., Ola, Uber, Swiggy for restaurant services) must:
(A) Collect TCS only (B) Pay the full GST on the service as if they are the supplier (C) Only file GSTR-8 (D) No obligation — the individual restaurant/driver pays
39.For Ola/Uber drivers (individual suppliers), who pays the GST for each trip?
(A) The driver pays directly (B) Ola/Uber (e-commerce operator) pays GST under Section 9(5) deeming provision (C) Passenger pays GST directly (D) No GST on cab services
40.The "aggregate turnover" for GST threshold computation includes:
(A) Taxable supplies + exempt supplies + exports + inter-state supplies — but excludes GST itself (B) Only taxable supplies (C) Only intra-state supplies (D) Only goods turnover
41.Job work under GST: the principal who sends goods to job worker can claim ITC on:
(A) Only after job work is completed and goods are received back (B) As soon as goods are sent to job worker — inputs and capital goods (C) Never — job work breaks ITC chain (D) Only if job worker is GST-registered
42.Goods sent for job work must be returned within:
(A) 90 days (inputs) / 3 years (capital goods) (B) 1 year (inputs) / 3 years (capital goods) (C) 6 months / 1 year (D) 2 years / 5 years
43.GSTR-2B reconciliation identifies "invoices in GSTR-2B but not in my books." This could mean:
(A) Supplier filed GSTR-1 for wrong GSTIN (B) The buyer received goods but did not record the invoice in their purchase records (C) GSTN error (D) Both A and B are possible
44.The "matching concept" in GST was originally designed to ensure:
(A) Buyer's purchase matches supplier's sale in value (B) Buyer's ITC claim is validated against supplier's reported outward supply (C) Cash Ledger matches GSTR-3B tax paid (D) e-Way Bills match invoices
45.GST on education services provided by a recognised institution is:
(A) 18% (B) 12% (C) 5% (D) Exempt (Nil)
46.GST on health care services provided by a hospital is:
(A) 18% (B) 5% (C) 12% (D) Exempt (Nil)
47.GST on hotel accommodation where room tariff is ≤ ₹7,500 per night (as per current rules) is:
(A) 12% (B) 18% (C) 28% (D) 0%
48.The IndIaTaxSim Advanced Topics course covers which module numbers?
(A) Modules 1–20 (B) Modules 61–80 (covering QRMP, composition, TDS, ECO, OIDAR, NRTP registrations + reconciliation) (C) Modules 51–60 (D) Modules 40–50
49.GSTR-2B Reconciliation (Module 81) in IndIaTaxSim helps students practice:
(A) Filing GSTR-1 (B) Comparing GSTR-2B ITC with purchase register to identify matched, missing in books, and missing in GSTR-2B items (C) Generating e-Way Bills (D) Computing late fee
Answer Key
1–B 2–B 3–B 4–B 5–B 6–B 7–B 8–B 9–B 10–C 11–B 12–B 13–B 14–B 15–B 16–B 17–B 18–B 19–A 20–B 21–A 22–B 23–B 24–C 25–B 26–B 27–B 28–B 29–B 30–B 31–B 32–B 33–B 34–B 35–C 36–B 37–B 38–B 39–B 40–A 41–B 42–B 43–D 44–B 45–D 46–D 47–D 48–B 49–B
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