The quick answer
Purchase reconciliation checks whether the invoices in your books match supplier-reported GST information. Match documents, not just one grand total. GSTIN, invoice identity, date, taxable value and each tax component can reveal errors that a total hides.
Current Invoice Management System (IMS) actions can affect the statement and require recomputation where applicable. Review the latest portal guidance. Reconciliation establishes the differences; credit eligibility still needs its separate statutory assessment.
Before you begin
- Purchase register, original supplier invoices and credit/debit notes.
- The correct GSTIN’s GSTR-2B for the period and applicable IMS records.
- Receipt, payment and previous-claim evidence for disputed items.
See how the pieces connect
Match
Compare the books and statement invoice by invoice.
Classify
Separate exact matches, differences and missing records.
Resolve
Contact suppliers and review applicable IMS action.
Document
Prepare eligible-credit decisions and retain evidence.
Work through the steps
Export the right records
Use the same GSTIN and relevant period for the books and GST statement. Preserve original exports before cleaning them. Include supplier notes and adjustments instead of comparing invoices alone.
Build reliable matching keys
Use supplier GSTIN and invoice identity, with dates and document types as cross-checks. Watch for punctuation or leading zeros, but do not merge different invoices solely because their amounts happen to match.
Compare values and components
Check taxable value, CGST, SGST, IGST and applicable cess separately. Record rate or place-of-supply differences. An equal gross amount can still conceal a component mismatch.
Classify the exceptions
Create groups for missing-in-statement, missing-in-books, duplicates and amount or identity differences. Assign a follow-up owner. A missing book entry may be genuine omitted evidence or an invoice unrelated to your business.
Investigate with the supplier
Share the exact reference and difference. Check filing period and amendments, and obtain corrected evidence where needed. Do not change your original invoice to imitate a supplier’s incorrect entry.
Review IMS and statement updates
Where IMS applies, evaluate the available action from the actual facts and latest guidance. Recompute GSTR-2B when required after actions. Retain the updated version used for the review; an earlier draft can become stale.
Prepare the credit decision trail
Separately assess eligibility and any reversals or previously claimed amounts. Save matched records, exceptions, supplier correspondence and final statement. Use the reviewed amounts in the return preparation.
A worked example
A matching table shows what the total misses
Illustrative reconciliation. No entry is an automatic credit determination.
| Invoice | Books vs statement | Next action |
|---|---|---|
| SUP-A/71 | Identity and components match | Review eligibility and previous claim |
| SUP-B/29 | ₹900 tax in books, ₹810 in statement | Investigate the ₹90 difference |
| SUP-C/18 | Present in books, absent in statement | Check supplier reporting and period |
| SUP-D/44 | Statement only | Verify that it belongs to the business |
Keep exceptions visible until resolved. Do not force all items into a matched category just to produce a clean summary.
Common mistakes to avoid
- Matching on amount alone or hiding differences by rounding.
- Using a statement for the wrong GSTIN or period.
- Changing IMS actions without understanding their consequences.
- Claiming an invoice twice after an amendment or later appearance.
Questions you might have
Does a mismatch always mean the supplier is fraudulent?
No. Timing, data errors, amendments and incorrect matching can create differences. Investigate the document and reporting facts.
Can Dukanam help organise the comparison?
Its eligible GST preparation workflows support working records and reconciliation preparation. Review current capabilities and complete required portal actions separately.
Dukanam
A smart, low-cost choice for small-business GST billing
Dukanam brings billing, purchases, stock, customer balances, payments and reports together. It is built for Indian small businesses that want clear records without a complicated setup.
Best suited to shops that want connected everyday billing and bookkeeping, web and mobile access, and nine product languages. Choose the plan that includes the features you need.
GST-aware billing and preparation depend on your plan. Review records before filing on the GST portal; Dukanam does not directly submit GST returns, government e-invoices or e-way bills.
Current plans with GST preparation
- Advanced Plan₹299.00 per month
Check annual prices, limits, applicable taxes and checkout terms. Paid plans do not include a free trial.
Sources and further reading
Official rules and portal screens can change. Use the linked authority for the current requirements; the figures in our worked examples are illustrative.