Section 17 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.
Clause (ab) is the shortest of the motor vehicle clauses and the one that produces the largest annual value, because running costs recur.
Credit is blocked on services of general insurance, servicing, repair and maintenance in so far as they relate to motor vehicles, vessels or aircraft referred to in clause (a) or clause (aa). The proviso restores it in three cases: (i) where the vehicle, vessel or aircraft is used for the purposes specified in those clauses; (ii)(I) where received by a taxable person engaged in the manufacture of such motor vehicles, vessels or aircraft; and (ii)(II) where received by a person engaged in the supply of general insurance services in respect of such vehicles insured by him.
The clause follows the asset
The blocking language is "in so far as they relate to motor vehicles, vessels or aircraft referred to in clause (a) or clause (aa)".
So the first question is never about the service. It is about the asset:
- Is the vehicle within clause (a)? A motor vehicle for transportation of persons with 13 or fewer approved seats. If it has 14 or more, or is a goods carrier, it is not referred to in clause (a) at all — and clause (ab) has nothing to attach to. Credit on its insurance and repairs is available without needing the proviso.
- Is the vessel or aircraft within clause (aa)? All of them are, subject to the permitted uses.
Proviso (i): the asset is used for a permitted purpose
Where the vehicle is used for further supply, transportation of passengers or driving training — or a vessel or aircraft for one of the five clause (aa) purposes — the credit on insurance, servicing, repair and maintenance is available.
The logic is simple: if the asset's own credit is available, its running costs should be too.
So a taxi fleet operator takes credit on the vehicles, on their insurance, on their servicing and on their repairs. A car dealer does the same for stock.
Proviso (ii)(I): manufacturers
Where the services are received by a taxable person engaged in the manufacture of such motor vehicles, vessels or aircraft, credit is available.
This covers the manufacturer's own operations — test vehicles, vehicles in the production and validation cycle, and vehicles held for engineering purposes. Without it, an automobile manufacturer would be denied credit on servicing its own products.
Proviso (ii)(II): insurers
Where the services are received by a person engaged in the supply of general insurance services in respect of such motor vehicles, vessels or aircraft insured by him, credit is available.
This is the motor insurance industry's provision. An insurer settling a claim by having the vehicle repaired at a network garage receives a repair service relating to a blocked vehicle — its own policyholder's car. Without this proviso, the insurer would bear the GST on every cashless claim as a cost.
Note the limitation: the vehicle must be insured by him. An insurer cannot take credit on repairs to a vehicle it does not insure.
Where the analysis goes wrong
Treating the service as the test. The clause is asset-driven. A repair bill is not blocked because it is a repair bill; it is blocked because of what was repaired.
Missing the 14-seat exit. Insurance and repairs on a company bus with 30 approved seats are fully creditable, because the bus is not a clause (a) vehicle.
Goods vehicles. Insurance, servicing and repair of a truck fleet is fully creditable. This is often reversed unnecessarily.
Fuel. Petrol, diesel and natural gas are non-taxable supplies outside GST, so there is no credit to claim in the first place. This is not a clause (ab) question at all.
Spare parts bought directly. Where a business buys parts and fits them itself, it has received goods, not a "servicing, repair and maintenance" service. On a strict reading clause (ab) covers services. The counter-argument is that clause (a) itself blocks the vehicle and the parts are used in it, but clause (a) blocks the vehicle, not its components. This is unsettled and worth documenting either way.
Accessories and fitments. Same analysis as spare parts.
Practical notes
- Classify the fleet first — by approved seating capacity and by goods versus persons. Everything follows from that list.
- Tag insurance and workshop invoices to the vehicle, so the credit decision is made per asset rather than per vendor.
- Manufacturers and insurers should identify the proviso they rely on in the working papers; the two carve-outs are narrow and specific.
- Review annually. A vehicle that moves from employee use into a passenger transport business changes status prospectively.
Key takeaways
- Clause (ab) blocks general insurance, servicing, repair and maintenance of vehicles, vessels and aircraft referred to in clauses (a) and (aa).
- Credit is available where the asset is used for a permitted purpose under those clauses.
- Manufacturers of such vehicles, vessels or aircraft get credit.
- General insurers get credit on vehicles insured by them.
- Vehicles with 14 or more seats and goods carriers are outside clause (a), so their running costs are fully creditable.
- Fuel is outside GST — no credit question arises.
Read next
- Section 17(5)(a): Motor Vehicles and the Thirteen-Seat Test
- Section 17(5)(aa): Vessels and Aircraft
- Leasing, Renting and Hiring of Motor Vehicles
- Blocked ITC Under Section 17(5)
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).