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                   58504 Points
                   Joined June 2010
                
               
			  
			  
             
            
             Great set of questions! You're thinking correctly from a compliance and practical use-case point of view. Let's tackle each query in a structured way:
✅ Background Concepts:
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Section 54 of CGST Act, 2017 governs refunds. 
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Once TDS (under GSTR-7) or TCS (under GSTR-8) is claimed by the deductee/supplier, the deductor or ECO cannot claim a refund. 
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But if not claimed by the supplier, the deductor/ECO can claim refund or adjust in future months. 
🔹 Query 1:
Under which head can refund of erroneous/excess TDS deducted and paid be applied?
✅ Answer:
The deductor can apply for refund under Section 54 by filing Form GST RFD-01.
📝 Important:
🔹 Query 2:
Can deductor adjust excess TDS paid against subsequent month's liability if supplier hasn't claimed it yet?
✅ Answer:
Yes, adjustment is allowed.
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If supplier has not filed TDS credit received statement, the deductor can adjust the excess TDS in the next GSTR-7 filing. 
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This is permissible under the principles of GST and general accounting — it’s a book adjustment as long as portal permits and records are maintained. 
📌 Tip: Maintain an internal reconciliation register and evidence to avoid litigation.
🔹 Query 3:
Can E-commerce operator (ECO) apply for refund of excess/erroneous TCS paid? If yes, under which head?
✅ Answer:
Yes, an E-commerce operator can apply for refund using GST RFD-01 under Section 54, if the supplier has NOT claimed TCS in their electronic cash ledger.
🔸 This is similar to TDS case. Once the TCS is claimed by the supplier, refund is not available to the ECO.
🔹 Query 4:
Can E-commerce operator adjust excess TCS paid in subsequent months, if supplier hasn’t claimed it yet?
✅ Answer:
Yes, the ECO can adjust the excess TCS in subsequent GSTR-8 filings, as long as:
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The supplier has not claimed the excess TCS, and 
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Proper documentation and reconciliation are maintained. 
The GST portal allows this auto-adjustment of excess TCS paid. No separate approval needed, just proper reporting.
✅ Summary Table:
| Query No. | Scenario | Refund Allowed? | Adjustment Allowed? | Head in RFD-01 | 
| Q1 | Excess TDS (supplier not claimed) | ✅ Yes | ✅ Yes | Excess payment of tax/Others | 
| Q2 | Adjust TDS in future months | ❌ No refund | ✅ Yes | Not applicable | 
| Q3 | Excess TCS (supplier not claimed) | ✅ Yes | ✅ Yes | Excess payment of tax/Others | 
| Q4 | Adjust TCS in future months | ❌ No refund | ✅ Yes | Not applicable |