The Blocked Credit Audit File: What to Keep and Why

Blocked Credit Audit File explained: this guide covers what it means, who it applies to, the step-by-step process, documents required, fees, due dates and penalties in India — so you can stay compliant with confidence and avoid costly mistakes.

Section 17(5) positions are rarely lost on the law. They are lost because the file cannot show what the vehicle's approved seating capacity was, which statute compelled the canteen, or how the plant and machinery value was arrived at.

Every one of those is a document that exists at the time and does not exist three years later.

Nine files carry almost every s.17(5) position: the vehicle register, the statutory obligation file, the plant and machinery split, the capitalisation memo, the bill of materials, the normal loss norms, the CSR project tagging, the composition supplier list, and the contemporaneous positions note. Each must be created when the transaction happens, not when the notice arrives.

1. The vehicle register

For every vehicle, vessel and aircraft: approved seating capacity from the registration certificate, category (persons or goods), use, and the clause (a) or (aa) conclusion.

This one document answers clause (a), clause (aa), clause (ab) and the leasing limb of clause (b)(i). Without it, every vehicle-related credit is defended from memory.

Keep a copy of the RC, not just the capacity figure.

2. The statutory obligation file

For every claim under the obligatory-under-law proviso: the statute, section and rule, the State notification where applicable, and the evidence of the threshold — worker count for a Factories Act canteen, employee count for a creche, shift timings for night transport.

Officers outside the State will not be familiar with a State rule. Supply it. The obligatory-under-law proviso →

3. The plant and machinery split

Separate bills of quantities for apparatus, foundations and structural supports, distinct from civil works. Engineering drawings and technical specifications. Separate contract pricing and invoicing. The asset register mirroring the split.

Created at contract award. A split constructed at capitalisation, with no contractual basis, is an assertion. The plant and machinery definition →

4. The capitalisation memo

For every repair, renovation or fit-out: the accounting judgment, the standard applied (Ind AS 16 or AS 10), and the split between capitalised and expensed, supported by an itemised contractor bill.

Explanation 1 makes the accounting treatment decide the tax, so the memo is a tax document. To the extent of capitalisation →

5. The bill of materials

For clause (h) reversals on manufactured goods written off: a bill of materials or standard cost build-up showing the inputs contained in the finished product.

The reversal is of credit on the inputs, not tax on the output, and a percentage estimate will not hold. Section 17(5)(h) →

6. Normal loss norms

Documented normal process loss percentages per process, supported by technical data or published industry norms, with an input-output reconciliation showing actual against normal.

This is what separates non-reversible normal loss from reversible abnormal loss.

7. CSR project tagging

A separate cost centre or project code for s.135 spending, applied at the purchase order stage, covering the CSR activity and its peripheral costs — consultancy, impact assessment, monitoring, reporting.

Kept distinct from voluntary social spending, which is outside clause (fa). Section 17(5)(fa) →

8. The composition supplier list

Suppliers registered under s.10, identified in the vendor master. Their bills of supply carry no tax, so there is nothing to claim — but GSTR-9 Table 16A requires the disclosure, and it is usually blank because nobody flagged them. Clauses (e) and (f) →

9. The contemporaneous positions note

For every judgment call — a borderline plant and machinery item, an incentive trip treated as business travel, a professional subscription treated as outside "club" — a short note written at the time, stating the facts, the provision, and the conclusion.

Three years later, the reasoning is the defence. The conclusion alone is not.

When each is created

Two of these — the plant and machinery split and the CSR tagging — must happen before money is committed. The rest can be built alongside the transaction. None can be built afterwards.

Key takeaways

• Nine files carry almost every s.17(5) position.
• The vehicle register alone answers four clauses.
• The plant and machinery split must be made at contract award.
• The capitalisation memo is a tax document, because Explanation 1 makes accounting decide the outcome.
• Normal loss norms are what distinguish reversible from non-reversible loss.
• A contemporaneous positions note is the defence for every judgment call.

Read next

• Blocked ITC Under Section 17(5)
• Order of Operations: Block First, Then Apportion
• The Plant and Machinery Definition
• GST Audit Checklist: What Officers Check

Disclaimer: Positions stated as on 5 September 2026, based on the CGST Act as amended to 31 March 2026 (ICAI Bare Law, 12th edition) and the ICAI Handbook on Blocked Credit under GST (November 2025).