GST Mastery: Complete Indian Goods & Services Tax

Legal framework | Supply | Time & Place of Supply | Valuation | Input Tax Credit (ITC) | Returns (GSTR-1, 3B, 9) | Accounting Entries | Real-life Case Studies | Interactive Tools

1. Legal Framework – CGST, SGST, IGST, UTGST

GST is a dual tax: CGST (Central) + SGST (State) for intra-state; IGST for inter-state (collected by Centre, apportioned to state). Constitutional Amendment (101st) effective July 1, 2017.

Key Acts: CGST Act 2017, IGST Act 2017, UTGST Act 2017, GST (Compensation to States) Act.

📌 Tax Rate Finder (GST Slabs)

Selected category tax rate: 5% (CGST 2.5% + SGST 2.5%) or IGST 5%

🏢 Registration Threshold & Composition Scheme

Turnover > ₹40 Lakhs (₹20 Lakhs for special states) requires registration. Composition available for turnover ≤ ₹1.5 Cr.

2. Concept of Supply & Determination of Tax Liability

Supply includes sale, transfer, barter, exchange, license, rental, lease – for consideration in course of business. Schedule I & II define deemed supplies.

⏱️ Time of Supply (ToS) – Goods

ToS = earliest of invoice date or payment date (or receipt of goods). Liability arises on ToS.

📍 Place of Supply (PoS) – Inter/Intra State

Inter-state supply → IGST applicable.

3. GST Calculation & Accounting (Journal Entries)

🧾 GST Liability Calculator (CGST+SGST/IGST)

CGST: ₹6,000, SGST: ₹6,000, Total: ₹12,000
Journal Entry: Dr. Cash/Bank ₹1,12,000; Cr. Sales ₹1,00,000; Cr. CGST Payable ₹6,000; Cr. SGST Payable ₹6,000

📥 Input Tax Credit (ITC) – Conditions & Reversal

Eligible ITC = ₹35,000 (Rule 42/43 proportionate reversal applies).

📚 Real Accounting Scenario: Purchase with GST & Sale with ITC setoff

4. GST Returns Filing & Due Dates

Key returns: GSTR-1 (Outward supplies) by 11th of next month, GSTR-3B (Summary return with payment) by 20th of next month, GSTR-9 (Annual return).

📆 Late Fee & Interest Calculator

Late fee: ₹50/day (max ₹5,000), Interest @18% p.a. = ₹185

📊 Monthly GST Liability Tracker (Sample Business)

Illustrative quarterly trend of GST payable (₹ Lakhs)

Due Dates: GSTR-3B (20th of next month), GSTR-1 (11th), Annual return (31st Dec of next FY). QRMP scheme for turnover < ₹5 Cr.

5. Advanced Compliance: E-Way Bill, Reverse Charge (RCM), TDS/TCS

🚚 E-Way Bill Generation Rule

E-way bill mandatory if value > ₹50,000 (inter-state movement).

🔄 Reverse Charge Mechanism (RCM) – Specified Goods/Services

Recipient liable to pay GST under RCM: ₹500 (CGST+SGST).

TDS under GST (Section 51): Govt departments deduct 2% (1% CGST + 1% SGST) on supply > ₹2.5 Lakhs. TCS under GST (Section 52): E‑commerce operators deduct 1% (0.5%+0.5%).

6. Real-life Case Studies – GST Litigation & Planning

Case Study 1: Manufacturer "ABC Pvt Ltd" – ITC Disallowance

ABC purchased machinery worth ₹50 Lakhs (GST 18%) used 40% for exempt products. The department disallowed 40% ITC. Compute admissible ITC and reversal.

Case Study 2: Inter-state Stock Transfer – Is it Supply?

XYZ Ltd transfers goods from Karnataka to Maharashtra branch without consideration. Under Schedule I, stock transfer is deemed supply – IGST payable.

Case Study 3: E‑commerce Operator (Flipkart) – TCS Liability

Flipkart collects ₹10 Lakhs from customers on behalf of seller. TCS @1% (0.5% CGST + 0.5% SGST). Compute TCS to be deposited.

Case Study 4: Composite Supply vs Mixed Supply (Restaurant with takeaway)

A restaurant sells food (5% GST) and also sells packaged ice cream (18% GST) as a combo. Determine tax treatment as per Section 8.

7. GST Audit, Scrutiny & Demand Notice

Annual turnover > ₹5 Cr requires audit by CA (GSTR-9C). Department can issue scrutiny notice under Section 61, assessment under Section 73 (normal) or 74 (fraud).

Penalty Provisions: Up to 100% of tax for fraud, 10% or ₹10,000 for others. Arrest for evasion > ₹5 Cr.

8. Recent GST Updates (2024-25) & Future Reforms

📈 GST Revenue Trend (India)

Monthly GST collections (₹ Cr) – demonstrating growth.