GST accounting is a critical part of SME finance. It directly affects profitability, compliance, working capital, and audit preparedness.Incorrect GST accounting leads to:
- Wrong ITC claim
- GST notices for mismatch (GSTR-1 vs GSTR-3B, 2B vs books)
- Cashflow blockage
- Penalties & interest
- Misstated financial statements
This guide provides a clear, structured method to record GST transactions related to , , and .
GST is a destination-based, multi-ledger tax system involving:
- ITC on eligible inward supplies
- Output GST liability
- Reverse charge GST liability (self-taxed)
- Payment, set-off, and reconciliation
Because GST flows through invoices, books, and returns, accounting discipline is essential for:
- ITC accuracy
- Output reporting
- RCM liability
- Audit trail
- Avoiding mismatches with 2B and 1
To explain how to correctly account for GST on purchases (input), sales (output), and reverse charge mechanism (RCM), and how to maintain reconciliation-ready ledgers.
GST paid on purchases.Recorded as until claimed.
• Input CGST• Input SGST• Input IGST
ITC is claimable only if:
- Invoice is available
- Goods/services received
- Supplier filed GSTR-1 & it appears in 2B
- Payment made within 180 days
- No blocked credit under Sec 17(5)
GST charged on sales of goods/services.Recorded as .
• Output CGST• Output SGST• Output IGST
Correct output posting ensures:
- GSTR-1 accuracy
- GSTR-3B liability matching
- Cash ledger planning
GST that the must pay instead of supplier.
Examples:
- Legal services
- Goods transport (GTA)
- Import of services
- Security services (in certain cases)
- Sponsorship services
RCM requires:
Liability to be recorded
GST to be paid in cash
Separate ITC claim (if eligible)
A practical structure ensuring complete accuracy.
• Input CGST• Input SGST• Input IGST
• Output CGST• Output SGST• Output IGST
• RCM GST Liability• RCM ITC Receivable (if eligible)
Separate ledgers = clear reconciliation.
Purchase A/c (or Expense A/c) Dr
Input CGST Dr
Input SGST Dr
To Supplier A/c
If IGST applies:
Input IGST Dr
Customer A/c Dr
To Sales A/c
To Output CGST
To Output SGST
For interstate:
To Output IGST
Legal Expense A/c Dr
To Vendor A/c
RCM CGST Payable Dr
RCM SGST Payable Dr
To GST Payable (Cash Ledger)
If IGST applies:
RCM IGST Payable Dr
After RCM is paid in cash, ITC is booked:
Input CGST (RCM) Dr
Input SGST (RCM) Dr
To RCM CGST Payable
To RCM SGST Payable
Monthly reconciliation between:
Ensures ITC accuracy and eligibility.
Ensures outward reporting is correct.
Validates liability and ITC claimed.
Ensures no missed liabilities.
Unbooked expenses or unreceived invoices require:
- GST provisioning
- RCM provisioning
- ITC deferrals
This keeps financial statements accurate.
When goods are returned:
Supplier A/c Dr
To Purchase Return A/c
To Input GST (reversal)
Sales Return A/c Dr
Output GST (reversal) Dr
To Customer A/c
GST must be adjusted proportionately.
GST applies on , not goods.
Bank A/c Dr
To Advance from Customer
To Output GST (if applicable)
GST is paid as IGST through Bill of Entry and ITC is claimable.
- Booking GST incorrectly under wrong ledger
- Not separating RCM liability and RCM ITC
- Claiming ITC without checking 2B
- Missing ITC on capital goods
- Not reversing ITC for non-payment within 180 days
- Booking revenue net of GST
- GST mismatch between books and 3B
- Forgetting GST on reimbursements
- Not accounting for late fees & interest
These lead to notices, penalties, and cashflow issues.
Company claimed ₹12 lakh ITC incorrectly due to wrong ledger postings.
• Corrected Input vs Output segregation• Matched ITC with 2B• Cleaned RCM entries• Implemented monthly reconciliation
• ₹8 lakh excess ITC reversed proactively• No notice issued• Accurate liability reporting
• GST Purchase Register• GST Sales Register• RCM Register• GST Ledger Mapping Template• Monthly GST Reconciliation Format (Books vs 2B vs 1 vs 3B)• GST Accounting SOP