ITC Reconciliation
& Advisory
Mismatches between your purchase register, GSTR-2A, and GSTR-2B can cost you lakhs in disallowed Input Tax Credit. TaxClue reconciles every invoice, identifies root causes, advises on eligible vs blocked ITC, and ensures your claims are airtight before any GST scrutiny.
GSTR-2A vs GSTR-2B vs Purchase Register
Every ITC claim starts with understanding three data sources and how they differ. Getting this wrong — either over-claiming ITC or missing legitimate credits — is the most common source of GST scrutiny notices and demands.
| Feature | GSTR-2A | GSTR-2B | Purchase Register |
|---|---|---|---|
| Nature | Dynamic — updates any time | Static — locked on 14th of month | Your internal books |
| Generated by | Supplier's GSTR-1 / IFF filings | Based on supplier's cut-off date filing | Your accountant / ERP |
| Used for ITC claim | Advisory / reference only | Primary basis for ITC claim | Internal verification |
| Can change after month-end? | Yes — if supplier amends returns | No — static for the month | Yes — within closing period |
| Includes IGST on imports? | No | Yes — ICEGATE data included | Based on ICEGATE bills of entry |
| Scrutiny basis | Historical reference | GST dept compares 3B claims with 2B | Audit / assessment evidence |
Rule 36(4) — The 110% Provisional ITC Rule
Under Rule 36(4) of the CGST Rules, ITC claimed in GSTR-3B cannot exceed the ITC reflected in GSTR-2B by more than 5% (i.e., maximum claim = 105% of GSTR-2B). Any claim beyond this is provisional and at risk of disallowance. If a supplier has not filed their GSTR-1 for a month, their invoices won't appear in your GSTR-2B — and your ITC claim for those invoices is at risk.
Types of ITC Mismatches & What Causes Them
ITC Claimed > GSTR-2B
You claimed ITC that isn't in GSTR-2B — either supplier didn't file GSTR-1 or filed it late. Department will issue ASMT-10 / DRC-01.
→ Reversal + 18% interest requiredSupplier GSTIN Invalid / Cancelled
Invoice from a vendor whose GST registration was cancelled — ITC on such invoices is ineligible even if reflected in 2A earlier.
→ Reverse ITC + verify supplierITC on Ineligible Purchases (Sec 17(5))
Motor vehicles, food, club memberships, personal use items, works contract on immovable property — permanently blocked.
→ Reverse immediately if claimedInvoice Details Mismatch
Invoice number, date, GSTIN, or amount in your books differs slightly from what's in GSTR-2B — portal mismatch blocks auto-match.
→ Verify with supplier & correctSupplier Filed Late / In Wrong Month
Supplier filed GSTR-1 in month 2 for an invoice dated month 1 — appears in your GSTR-2B one month late, causing timing mismatch.
→ Defer ITC to matching monthITC in 2B But Not in Books
Supplier filed GSTR-1 with your invoice but your accountant didn't book it — missed ITC that's legitimately claimable.
→ Book invoice and claim ITCITC Mismatch Is the #1 Source of GST Demand Notices
The GST department runs automated system comparisons between your GSTR-3B ITC claims and your GSTR-2B data every month. Any excess claim beyond 105% of GSTR-2B triggers an automatic ASMT-10 scrutiny notice. TaxClue performs monthly reconciliation to catch these before the department does — turning a potential demand into a routine accounting adjustment.
Blocked Credits — ITC You Can NEVER Claim
Section 17(5) of the CGST Act lists categories of inward supplies on which ITC is permanently blocked — even if the purchase is genuine and GST was paid. Claiming ITC on these attracts reversal + 18% interest + potential penalty.
| Category | Examples | Exception (ITC Allowed) |
|---|---|---|
| Motor vehicles < 13 seats | Cars, SUVs purchased for business use | If used for: further supply, transport of persons (taxi), driving training |
| Vessels & aircraft | Business jets, yachts, boats | If used for transport of passengers, goods, or training |
| Food & beverages | Restaurant bills, staff canteen, corporate meals | If business is in food supply (restaurant/hotel) |
| Beauty treatment / health services | Spa, gym memberships, cosmetic surgery for employees | If business provides these services |
| Membership in clubs | Golf club, social club, holiday club memberships | No exception — always blocked |
| Travel benefits to employees | LTA, vacations, outbound trips not related to work | No exception — always blocked |
| Works contract on immovable property | Construction, renovation of office building | Allowed for: plant & machinery construction |
| Goods / services for personal consumption | Any purchase for personal use by owner/director | No exception — always blocked |
| Goods lost / destroyed / stolen | Inventory written off due to fire, theft, expiry | No exception — ITC must be reversed |
Claiming Blocked Credit Is a Common Costly Mistake
Many businesses unknowingly claim ITC on motor vehicle insurance, office renovation, or employee welfare expenses — all of which fall under Section 17(5). When caught during audit or assessment, the entire blocked ITC must be reversed with 18% interest and up to 100% penalty. TaxClue reviews your ITC claims annually to identify and reverse any blocked credits before they become a department demand.
Rule 42 & Rule 43 — Proportionate ITC Reversal
When a business makes both taxable and exempt supplies, or uses inputs for both business and personal purposes, the ITC cannot be claimed in full. Rules 42 and 43 of the CGST Rules provide the formula for calculating how much ITC must be reversed — this is a mandatory annual calculation that many businesses miss entirely.
Inputs & Input Services — Proportionate Reversal
Applies when inputs or input services are used for: (a) taxable supplies, (b) exempt supplies, and/or (c) non-business purposes. ITC on common inputs must be apportioned.
D2 = 5% of total ITC on common inputs (non-business use)
Reversal = D1 + D2
Capital Goods — Proportionate Reversal
Applies to capital goods (machinery, equipment) used for both taxable and exempt supplies. ITC must be apportioned over the life of the capital goods — typically over 60 months.
Exempt portion = (Monthly reversal × Exempt Turnover) / Total Turnover
Annual reversal = Sum of monthly calculations
Annual Reconciliation of Rule 42/43 — Done in GSTR-9
Rule 42/43 reversals are calculated provisionally every month in GSTR-3B and then reconciled annually in GSTR-9. If your annual exempt/total turnover ratio differs from what was used monthly, a one-time final adjustment is made — either additional reversal (payable with interest) or credit of excess reversal. TaxClue calculates this precisely for every client before GSTR-9 filing to avoid surprises.
TaxClue's ITC Reconciliation Process
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1
Data Collection
We collect your purchase register (Excel / Tally export), GSTR-2B downloads for the reconciliation period, GSTR-3B ITC claimed, and GSTR-2A for reference. All data is consolidated into a single working file.
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2
Invoice-Level Three-Way Match
Every invoice in your purchase register is matched against GSTR-2B at GSTIN + invoice number + date + amount level. Matched invoices (clean ITC), mismatched invoices (needs action), and unmatched invoices (risk) are separately identified.
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3
Root Cause Classification
Each mismatch is classified: supplier non-filing, timing difference, invoice detail error, blocked credit, ineligible purchase, or GSTIN error. Classification drives the action — reversal, follow-up with supplier, or carry-forward to next month.
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4
Supplier Follow-Up Tracking
For mismatches caused by supplier non-filing, we prepare a supplier-wise list with invoice details for your follow-up. Regular suppliers who consistently delay filing are flagged — contractual GST compliance clauses are recommended for repeat offenders.
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5
Blocked & Ineligible ITC Review
All ITC claimed is reviewed against Section 17(5) blocked categories. Any blocked ITC that has been inadvertently claimed is identified for reversal in the current GSTR-3B — before the department raises a notice.
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6
Rule 42/43 Reversal Calculation
If your business has both taxable and exempt supplies, we calculate the mandatory proportionate reversal for the period. This is incorporated into the GSTR-3B filing directly.
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7
Reconciliation Report & Advisory
A complete ITC reconciliation report is delivered showing: clean ITC (claimable), ITC to defer (timing), ITC to reverse (blocked/ineligible), ITC to recover (missed), and ITC at risk (supplier non-filing). Every figure is backed by invoice-level evidence.
ITC Advisory Services
TaxClue's ITC advisory goes beyond matching numbers — we help you optimise your ITC position, protect claims from department scrutiny, and structure your purchases to maximise legitimate credit.
ITC Health Audit
Full-year retrospective review of all ITC claimed — identifies wrongly claimed, missed, and at-risk ITC across all GST heads before year-end filing.
Vendor GST Compliance Monitoring
Monthly report on which vendors are consistently not filing GSTR-1 on time — your ITC is at risk from these suppliers. Contract clause recommendations included.
Exempt Supply ITC Optimisation
For businesses with mixed taxable and exempt supplies, we structure the Rule 42/43 calculation to minimise mandatory reversal while staying within legal bounds.
Pre-Audit ITC Defence
Before a GST audit, we prepare invoice-level evidence for every ITC claim — so any officer query can be answered with documentation instantly.
ITC Mismatch Notice Response
If you've received an ASMT-10 or DRC-01 for ITC mismatch, we draft a detailed reply with full reconciliation evidence within 48 hours.
Lapsed ITC Recovery
ITC not claimed within the statutory time limit (earlier of due date of return for September or GSTR-9 filing) — we identify and recover still-valid credits before they lapse.
Frequently Asked Questions
If the invoice is not in your GSTR-2B (because the supplier hasn't filed GSTR-1 by the cut-off date), you technically cannot claim ITC on it under the current rules. However, you can still claim up to 105% of your total GSTR-2B ITC provisionally — but this is at risk until the supplier files and the invoice appears in a future GSTR-2B. The safest approach is to follow up with the supplier, defer the ITC to the month the invoice appears in GSTR-2B, and adjust it in that month's GSTR-3B.
Under Section 16(4), ITC on a purchase invoice must be claimed by the earlier of: (a) the due date of GSTR-3B for September of the next financial year, or (b) the date of filing the annual return (GSTR-9) for the year in which the invoice was raised. For example, ITC on an invoice dated October 2024 (FY 2024–25) must be claimed by 20th October 2025 (September return due date) or the date of GSTR-9 filing for FY 2024–25, whichever is earlier. Missing this deadline means the ITC lapses permanently.
Always follow GSTR-2B for ITC claims. GSTR-2A is dynamic and updates whenever a supplier files or amends — it can show invoices filed after the GSTR-2B cut-off date. GSTR-2B is the static monthly statement generated on the 14th, and it is the legal basis for ITC claims under Rule 36. If an invoice appears in GSTR-2A but not GSTR-2B for a given month, it means the supplier filed after the 14th cut-off — the ITC on that invoice will appear in the next month's GSTR-2B.
Yes — the mode of payment does not affect ITC eligibility. ITC is allowed if the supply has been received, the tax has been paid by the supplier to the government, a valid tax invoice has been issued, and the GSTR-3B has been filed. However, under Section 16(2)(b), payment for the invoice must be made to the supplier within 180 days of the invoice date — otherwise the ITC claimed must be reversed (with interest) until payment is actually made.
It depends on the vehicle. Insurance on motor vehicles having seating capacity of 13 or more persons (buses, large vans) is eligible for ITC. Insurance on smaller vehicles (cars, SUVs, bikes) is blocked under Section 17(5)(a) — unless the vehicle is used for further supply of vehicles, transport of passengers, or imparting driving training. For most regular businesses using cars for sales visits or executive travel, motor vehicle insurance ITC is blocked and must be reversed if claimed.
Monthly — ideally before filing each GSTR-3B. The longer you wait, the harder it is to trace mismatches and the more interest accumulates on any wrongly claimed ITC. Monthly reconciliation also keeps your supplier follow-up current. TaxClue performs reconciliation as part of the monthly GSTR-3B filing process for all retainer clients — so every claim filed is pre-verified against GSTR-2B before submission.
ITC Reconciliation Done Right, Every Month
Stop losing ITC to mismatches, blocked credits, and lapsed claims. TaxClue reconciles every invoice, every month — so your ITC claims are bulletproof.
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