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Indian manufacturers running job-work programmes under Section 143 of the CGST Act dispatch inputs and capital goods to dozens of job-workers on delivery challans, with statutory return windows of one year for inputs and three years for capital goods — beyond which the original dispatch is deemed a supply and triggers GST with 18% interest — and the reconciliation between the dispatch challan register, the return challan, the ITC-04 quarterly return, and the Section 393(1)(a) TDS on job-work charges is a four-way control that breaks once challan volume exceeds 200-300 a month.
Tag every Section 143 dispatch challan at origin with a job-worker GSTIN, an input/capital goods flag, a value and a statutory clock (1 year for inputs, 3 years for capital goods); match return challans against the dispatch register on goods description and quantity; roll up the open-position by job-worker into the quarterly ITC-04 (or annual where turnover is up to ₹5 crore); flag challans approaching their statutory window 60 days in advance; on job-work payment, run the Section 393(1)(a) TDS deduction at 1% (individual/HUF) or 2% (company/firm).
Job-worker master with GSTIN, PAN, TDS rate per Section 393 code, registered/unregistered status; challan series per principal GSTIN; statutory clock per challan (1 year inputs, 3 years CG, no clock for jigs/fixtures/moulds/dies); quarterly ITC-04 due date calendar; alert thresholds at 60 and 30 days before the statutory window; matching tolerance on returned quantity (e.g., 2% for process loss).
A daily job-work dashboard showing open dispatches by job-worker, days remaining to statutory window, returned-versus-dispatched reconciliation by goods description, quantity variance against process-loss tolerance, ITC-04 reporting status per quarter, and the Section 393(1)(a) TDS deducted on job-work charges with payment code 1002 tying to the monthly challan.
A finance controller at an auto-component manufacturer in Chennai pulls the job-work register on 31 March: 2,847 active challans across 23 job-workers, covering forgings sent for machining, castings sent for plating, sub-assemblies sent for paint, and PCBs sent for testing. Of those, 41 challans crossed the one-year return window in February and March without a return movement booked — a deemed supply event under Section 143(3) of the CGST Act has occurred, retrospectively dated to the original dispatch, with 18% interest accruing from the date of dispatch. The exposure: ₹2.3 crore in deemed GST plus ₹38 lakh in interest. This is what job work reconciliation Section 143 looks like when manual.
What Section 143 of the CGST Act allows
Section 143 of the CGST Act gives a registered principal manufacturer a structured way to send inputs or capital goods to a job-worker for further processing without the dispatch being treated as a supply at the point of despatch. Goods move on a delivery challan under Rule 45 of the CGST Rules, no GST is charged on the dispatch, the principal retains ownership of the goods throughout, and the job-work charges paid to the job-worker carry their own GST and TDS treatment separately.
The trade-off for that concessional treatment is the statutory return clock. Under Section 143(1), inputs must return to the principal (or be supplied directly from the job-worker’s premises under sub-section 1(b)) within one year of dispatch. Under Section 143(2), capital goods must return within three years of dispatch. Jigs, fixtures, moulds and dies sent to a job-worker are exempt from the return clock under a 2018 notification.
If the goods do not return within the statutory window, Section 143(3) and 143(4) treat the original dispatch as a supply on the date the goods were originally sent. The principal must pay GST on the deemed supply with interest under Section 50 from the original dispatch date. The 18% interest is what makes early detection of approaching-window challans the highest-value control on the job-work rail.
The principal-to-job-worker-to-principal flow
The default flow has three legs:
- Principal → job-worker: delivery challan under Rule 45, no GST, goods identified by description and quantity, transport documented with an e-way bill if value exceeds ₹50,000.
- Job-work at job-worker premises: the job-worker performs the agreed process (machining, plating, paint, assembly, testing), bills the principal for labour and processing charges under the job-worker’s own GSTIN, charges GST at the applicable rate on the job-work charges (commonly 12% for most job-work services since the 2022 rate revision, with some categories at 18%).
- Job-worker → principal: return challan referencing the original dispatch challan, no GST on the return movement (the goods belong to the principal throughout), e-way bill if applicable.
The alternative flow under Section 143(1)(b) lets the goods be supplied directly from the job-worker’s premises to an outside buyer. In that case the supply is treated as made by the principal — the principal raises the tax invoice to the customer, charges GST and reports the outward supply in its own GSTR-1. The original dispatch challan from principal to job-worker is matched against this supply event rather than a return movement.
For this alternate flow to be valid, either the job-worker must be a registered person or the principal must declare the job-worker’s premises as an additional place of business in the principal’s GST registration.
ITC-04 — the quarterly statutory return
ITC-04 is the statutory return that captures inputs and capital goods movement between the principal and the job-worker. The filing frequency depends on principal turnover:
- Principals with aggregate turnover above ₹5 crore: quarterly ITC-04, due on the 25th of the month following the quarter (25 July for April-June, 25 October for July-September, etc.).
- Principals with aggregate turnover up to ₹5 crore: annual ITC-04, due on 25 April for the preceding financial year.
The return captures, for each job-worker GSTIN, the opening balance of goods lying with the job-worker, goods sent during the period, goods returned during the period, goods supplied from the job-worker’s premises during the period, and the closing balance lying with the job-worker. The reconciliation between the principal’s challan register and the ITC-04 movement is the primary statutory control on the job-work rail — gaps between the two surface as audit findings, and persistent gaps can trigger a notice under Section 73 or 74.
The deemed supply trigger and the 18% interest exposure
When inputs do not return within one year (or capital goods within three years), Section 143(3) and 143(4) treat the original dispatch as a supply on the date of original despatch. The mechanical consequence is severe: the principal must compute GST on the value of the goods as if they had been sold on the day they were dispatched, file a self-assessed adjustment in the next GSTR-3B with that liability, and pay interest under Section 50 at 18% per annum from the original despatch date until the date of payment.
The 18% interest is what turns a challan that quietly missed its return window into a material P&L hit. On a ₹50-lakh challan dispatched in April 2024, missed and detected during the March 2026 statutory audit, the interest exposure alone is roughly ₹17 lakh — on top of the deemed-supply GST itself.
The defensive control is an ageing dashboard on the job-work register: 60-day alert and 30-day alert before each challan’s statutory window, with weekly escalation to the procurement or operations owner of the job-worker relationship. Where a return is genuinely delayed, the principal can apply for an extension under the proviso to Section 143(1)/(2) (Commissioner may allow up to one additional year for inputs and two additional years for capital goods) — but the extension must be obtained before the window closes, not after.
The TDS angle — Section 393(1)(a) on job-work charges
Separately from the goods movement, the job-work charges paid to the sub-contractor fall under Section 393(1)(a) of the Income Tax Act 2025, payment code 1002, which replaces legacy Section 194C. Rates and thresholds:
| Job-worker type | TDS rate | Per-txn threshold | Aggregate threshold |
|---|---|---|---|
| Individual or HUF | 1% | ₹30,000 | ₹1,00,000 / year |
| Company, firm, LLP, AOP, BOI | 2% | ₹30,000 | ₹1,00,000 / year |
TDS applies to the labour and processing charges only, not to the value of inputs that the principal already owns and that move on a delivery challan. The deduction must be deposited by the 7th of the following month (30 April for March) using payment code 1002 and reflected in the job-worker’s Form 26AS or AIS. For the full code map see TDS payment codes 1001-1092 India and Section 393 TDS new Income Tax Act reconciliation.
The legacy 194C reference remains visible for cross-era reconciliation against pre-April 2026 Form 26AS data.
Why this breaks at scale
A mid-size manufacturer running 20-30 active job-workers typically dispatches 200-400 challans a month and receives a similar volume of return movements. Each open challan carries a sender GSTIN, a job-worker GSTIN, an input/capital goods flag, a value, a description, a quantity, a despatch date, a statutory clock (1-year or 3-year), and a return-or-supply event yet to occur. The matching key between dispatch and return is the goods description plus quantity — and at job-work boundaries, goods change shape (a forging becomes a machined housing, a casting becomes a plated bracket), which makes name-based matching unreliable. Process loss adds a 1-3% quantity variance that must be accommodated as tolerance.
Reconciliation software India configured for Section 143 job-work tracks each open challan with a goods-description map (forging name → machined-housing name), a process-loss tolerance band, a statutory clock with 60-day and 30-day alerts, and an ITC-04 roll-up pipeline that ties the quarterly return back to the underlying challan ledger. The full manufacturing reconciliation pillar is at manufacturing reconciliation in India; the three-way procurement match that feeds the inputs entering the job-work loop is at PO-GRN-invoice three-way matching in India, also available as three-way matching software India. The capital-goods job-work case (jigs, fixtures, moulds — and capital assets sent for repair) connects to capital goods ITC reconciliation for Indian manufacturing. For the current text of Section 143, Rule 45 and the ITC-04 notifications, the GST portal is the authoritative source.