1. Why manufacturing accounting is different
A trader records a purchase, sells the same goods, and books the margin. A manufacturer breaks that clean line. Raw materials come in under one HSN and rate, get consumed into a product with a different HSN and rate, and leave as finished goods — with work-in-progress sitting in between, part-consumed and not yet sellable. The books have to track value at all three stages, and the GST position shifts as goods move through them.
That transformation is the source of every complication in this guide. Credit taken on an input is fine while the input is stock; it needs watching once the input is consumed into an exempt or partly-exempt output. Capital equipment carries credit that behaves under its own rules. And the moment a manufacturer sends half-finished goods to an outside job worker, an ordinary internal process becomes a GST transaction with its own paperwork and deadlines.
2. Capital-goods ITC does not behave like stock credit
Manufacturers buy plant, machinery, moulds, dies and tooling, and the GST on those purchases is often a large number. The credit is available — but it follows rules that credit on raw material does not, and getting them wrong is expensive precisely because the amounts are large.
Two points matter most. First, capital-goods credit is not spread out the way income-tax depreciation is. Subject to the usual Section 16 conditions, it is available in full in the period the capital goods are received — you do not amortise it. Second, and this is the one that catches people: Section 16(3) forces a choice. If you claim depreciation under the Income Tax Act on the tax component of a capital asset, you cannot also take input tax credit on that component. You take the depreciation or the credit, not both. Capitalising a machine at its full GST-inclusive cost and then also claiming the ITC is a double benefit the law expressly blocks.
There is a third wrinkle for anyone with exempt output. Where capital goods are used partly for taxable and partly for exempt supplies, Rule 43 apportions the credit over a useful life taken as 60 months, and the exempt portion is reversed month by month. A manufacturer with any exempt line at all cannot treat capital-goods credit as a one-time claim and forget it.
3. Job work: goods leave without a sale
Outsourcing a stage of production — plating, machining, printing, packing — is routine in manufacturing, and GST has a dedicated mechanism for it. Under Section 143, a principal can send inputs or capital goods to a job worker without payment of tax, on a delivery challan under Rule 45 rather than a tax invoice, and bring them back — or supply them directly from the job worker's premises — without the movement being treated as a taxable supply.
That relief is conditional on time limits. Inputs must come back, or be supplied out, within one year; capital goods within three years (moulds, dies, jigs, fixtures and tools are outside this limit). If goods do not return in time, the original despatch is deemed a supply from the day they were sent, and tax becomes payable with interest as though a sale had happened months earlier.
The practical failure mode is not fraud; it is drift. Goods go out for a quick operation, the job worker is slow, a challan is misplaced, and eighteen months later a movement that should have been tax-free is a deemed supply nobody accounted for. The control is a live register of what is out at each job worker and for how long — not a shoebox of challans reconciled at year end.
4. Reverse charge on freight and unregistered purchases
Manufacturers move a lot of weight, and the freight that moves it usually comes with a reverse-charge liability. Where goods transport agency (GTA) services are used and the GTA has not opted to pay under forward charge, the recipient — the manufacturer — pays the GST on that freight under reverse charge, and then claims it back as credit subject to the usual conditions. The tax is the business's to pay first and reclaim second, not the transporter's.
The same reverse-charge logic reaches certain other inward supplies, including specified purchases from unregistered persons and other notified services. The common thread is that the liability sits with the manufacturer as recipient, has to be self-invoiced and paid in cash rather than set off against credit, and only then becomes available as ITC. Books that record inward freight as a simple expense — with no reverse-charge entry — understate the tax due and, just as often, forgo the credit that would have offset it.
5. Inventory at three stages, valued correctly
A manufacturer's stock is not one number. It is raw material, work-in-progress and finished goods, each valued on a different basis, and the movement between them is the core of the accounts. Raw material is valued at cost of purchase; WIP and finished goods have to absorb a share of conversion cost — labour and overhead — not just the material they contain.
This is where a bill of materials stops being a production document and becomes an accounting one. Consuming inputs into an output at the right quantities is what keeps raw-material stock, WIP and finished-goods value honest, and it is what lets you see the real cost and margin of what you make rather than a guess. A stock system that tracks only what was bought and what was sold, with nothing in between, cannot value a manufacturing business — the WIP it ignores is often the largest number on the floor.
Inventory & bill-of-materials tracking
6. E-invoicing and e-way bills at manufacturing scale
Two compliance systems bear on manufacturers more heavily than on most trades. E-invoicing — reporting each B2B invoice to the government portal and printing the IRN and QR code — applies above a notified aggregate-turnover threshold that has been progressively lowered over the years (₹5 crore at the time of writing, though this has changed repeatedly and should be checked). A growing manufacturer crosses that line and has to move from printing invoices to reporting them, per invoice, in real time.
E-way bills, meanwhile, are near-continuous for a manufacturer: inward raw material, outward finished goods, and every job-work movement in between all cross the value threshold or a state boundary and need one. Tying the e-way bill to the invoice or delivery challan it describes — so the two can never disagree on value, GSTIN or HSN — removes a whole category of mismatch that otherwise surfaces at a check-post rather than in the office.
7. Input credit when some output is exempt
If everything a manufacturer produces is taxable, input credit is straightforward: claim it, subject to the four Section 16 conditions and monthly GSTR-2B reconciliation. The complication arrives with any exempt output — and manufacturers reach it more often than they expect, through by-products, scrap sold under exempt heads, or a product line that happens to be nil-rated.
Once there is exempt output, Rule 42 requires common input credit — the credit on things used for both taxable and exempt production, such as power, consumables and shared overhead — to be apportioned monthly and trued up at year end. Rule 43 does the same for capital goods over 60 months. Neither is optional once exempt supplies exist, and both are the kind of monthly computation that is trivial for software and error-prone by hand.
The mechanics of the underlying credit — the four cumulative conditions, the GSTR-2B dependency, the 180-day payment rule and the blocked credits in Section 17(5) — are the same for a manufacturer as for anyone else, and are set out in full in the input tax credit guide.
Input Tax Credit: conditions, reversals and blocked credits
8. A monthly discipline for a manufacturing business
As with distribution, almost everything above reduces to a set of habits run on a monthly rhythm. A manufacturer that keeps to them rarely has a GST problem.
- Decide depreciation vs ITC on every capital purchase at the point you capitalise it — book the asset net of GST where you are claiming the credit, per s.16(3).
- Keep a live register of goods out at each job worker, with the one-year (inputs) and three-year (capital goods) clocks visible, and file ITC-04.
- Raise a delivery challan and e-way bill for every job-work movement, and reconcile the return against the despatch.
- Book reverse charge on inward freight and other notified supplies — self-invoice, pay in cash, then claim the credit; do not record freight as a bare expense.
- Value stock at all three stages using a bill of materials, so WIP is not invisible and margins are real.
- Compute Rule 42 and 43 reversals monthly if any output is exempt, including scrap and by-products.
- Reconcile purchases against GSTR-2B every month and chase mismatches while the supplier still has reason to fix them.
9. Where software should carry the load
Nothing here is intellectually hard. It is hard because it is continuous and because the cost of a lapse — a job-work clock missed, a capital-goods credit taken alongside depreciation, a reverse charge never booked — surfaces long after the lapse and lands as a demand plus interest. That combination is what software is for.
Finkitaabh handles capital assets so the s.16(3) choice is made at capitalisation rather than reconstructed at filing, tracks job-work movements against their delivery challans with the return-by dates visible and ITC-04 in view, and books reverse charge on freight and notified supplies as the self-invoiced entry it has to be. Inventory is kept at the raw-material, WIP and finished-goods stages off a bill of materials, so the accounts value what is actually on the floor.
GSTR-2B reconciliation runs against the purchase register monthly, e-way bills are generated from the same invoice or challan they describe, and Rule 42 and 43 reversals come out of the posted books rather than a side calculation. The reconciliation, the eligibility decision and the accounting entry stop being three separate exercises done by three people at three different times.