GST for Computer Repair Shop

GST for Computer Repair Shop

A computer repair shop's GST obligation has three moving parts: the hardware it sells (18%, HSN Chapter 84/85), the repair and maintenance services it provides (18%, SAC 998713), and annual maintenance contracts or on-site jobs billed separately. For FY 2026-27, almost every urban repair shop is required to register, charge 18% uniformly, manage Input Tax Credit (ITC) on spare parts tightly, and — once turnover crosses ₹5 crore — generate IRN-stamped e-invoices on every B2B tax invoice. Here is the full compliance playbook.

GST Registration: Thresholds, Timelines, and the Mixed-Supply Trap

Most repair shops discover their registration obligation not at launch but mid-year, after a busy festive quarter pushes aggregate turnover past the limit. The thresholds for FY 2026-27 are:

\*Special category states include Manipur, Mizoram, Nagaland, Tripura, Meghalaya, Sikkim, Arunachal Pradesh, Uttarakhand, and Himachal Pradesh. Verify the applicable limit in your state's notification, as sub-limits vary.

The mixed-supply trap: Almost every repair shop that stocks spare parts and also provides labour falls into the "mixed" category. The lower ₹20 lakh services threshold applies — not the ₹40 lakh goods threshold. A shop doing ₹15 lakh in spares and ₹8 lakh in repair labour has ₹23 lakh aggregate turnover and must register. Aggregate turnover under Section 2(6) of the CGST Act 2017 includes all taxable supplies, exempt supplies, exports, and inter-state supplies under the same PAN — across all your business locations.

Timing: Apply within 30 days of crossing the threshold. Voluntary registration before that point is allowed and often sensible — it unlocks ITC from Day 1 and lets you issue proper tax invoices to corporate clients who require a GSTIN on your bill.

Documents needed for registration on the GST Portal:

1. PAN of the business and proprietor/partners/directors
2. Aadhaar of proprietor or authorised signatory (for e-KYC)
3. Proof of principal place of business (electricity bill, rent agreement, or property tax receipt)
4. Bank account details (cancelled cheque or front page of passbook)
5. Photograph of proprietor/authorised signatory
6. For partnership or LLP: Partnership deed or LLP Agreement
7. For company: Certificate of Incorporation, MoA, AoA

GST Rates: Hardware, Services, and Hybrids

Computer Hardware and Spare Parts (Goods)

The good news: virtually everything in a computer shop's inventory attracts 18%. The risk lies in classification at the 6- or 8-digit HSN level — misclassification triggers short-levy notices under ASMT-10 during departmental scrutiny.

Repair and Service Supplies

Note that software installation (SAC 997331) and network setup (SAC 998316) are technically distinct from hardware repair under SAC 998713, even though the rate is identical. Accurate SAC coding matters for Table 12 of GSTR-9 and for surviving a classification-based audit query.

SAC 998713: What It Covers and What It Does Not

SAC 998713 — "Maintenance and repair services of computers and peripheral equipment" — is the correct classification for the core business of a repair shop. It covers:

• Diagnosing and replacing faulty hardware components
• Preventive maintenance, cleaning, and servicing
• BIOS flashing and firmware updates
• Laptop screen, battery, keyboard, and port replacement
• Virus removal and OS reinstallation (where primarily a hardware service)
• On-site and carry-in repair jobs under AMC

What does NOT fall under SAC 998713:

• Sale or licensing of software → SAC 997331 (packaged software) or 997332 (cloud/SaaS)
• CCTV and networking cable installation for offices → SAC 998316
• Smartphone and tablet repair → SAC 998714 (maintenance and repair of consumer communication equipment)

Use at least a six-digit SAC on your tax invoices. Lumping mobile repair and PC repair under a single SAC 998713 is technically inaccurate and invites classification queries.

Composite Supply vs Mixed Supply: Where Most Shops Get It Wrong

Composite Supply

When you replace a customer's failed SSD and charge a single line — ₹3,800 for the 512 GB drive plus ₹700 for labour — that is a composite supply under Section 8(a) of the CGST Act. Both elements together accomplish one economic purpose (repairing the laptop). Since both goods (18%) and services (18%) attract the same rate here, the practical difference is nil in a computer shop context.

The concern arises when rates differ: if you sell a laptop (18%) bundled with a one-year software licence at a price that blurs the line, the tax treatment of the composite changes. Always separate line items with individual values on the invoice.

Mixed Supply

A mixed supply under Section 8(b) is two or more independent supplies sold together for a single consolidated price, where neither is incidental to the other. Tax applies at the highest applicable rate among all components. Example: selling a laptop at ₹65,000 and including "free" printed stationery kits (which would ordinarily attract 12% GST) in the same bundled transaction. If the department re-characterises this as a mixed supply, the stationery portion also gets taxed at 18%.

Best practice: Regardless of whether something is composite or mixed, separate every goods line and every service line on your invoice with its own HSN/SAC and taxable value. A ₹5,000 invoice reading "Labour – repair service (SAC 998713): ₹1,200; RAM 16 GB DDR4 (HSN 8473): ₹3,800" is audit-clean. A ₹5,000 invoice reading "Computer repair job: ₹5,000" is a classification risk waiting to be triggered.

Input Tax Credit: What You Can Claim and What You Cannot

Eligible ITC for a Repair Shop

• Spare parts purchased for resale or consumption in repair jobs: Fully eligible. Match every purchase invoice against a corresponding job card or stock register entry.
• Workshop tools and equipment (oscilloscopes, soldering stations, anti-static mats, hot-air rework stations): Capital goods — ITC available in the tax period of purchase under current rules.
• Workshop rent (GST billed in your GSTIN's name): Eligible as input service.
• Electricity charges where billed to your GSTIN: Eligible.
• Billing and accounting software subscriptions: Eligible as input service.
• Courier and logistics for dispatching devices to OEMs under warranty: Eligible as input service.

Blocked ITC — Section 17(5), CGST Act 2017

• Motor vehicles used for customer pickups and deliveries: ITC blocked unless you are specifically in the business of transportation, or the vehicle is used as a stock-in-trade.
• Personal-use electronics — proprietor's home router, personal laptop, tablet — even if purchased on the firm's GSTIN: Blocked.
• Food and beverages for staff: Blocked.
• Insurance premiums on blocked vehicles: Also blocked.

Maintain a blocked-credit register as part of your monthly close. Before posting any ITC to the electronic credit ledger, ask: "Is this item or its category named in Section 17(5)?" If yes, expense it to P&L instead.

GSTR-2B Reconciliation Is Non-Negotiable

Under Rule 88D, ITC can only be availed to the extent reflected in GSTR-2B. If your supplier files their GSTR-1 after the 11th of the following month, your GSTR-2B will not reflect that credit for that period. Do not avail ITC on the basis of purchase invoices alone — wait for GSTR-2B confirmation. Reconcile monthly.

The time limit for claiming ITC for FY 2026-27 supplies is the earlier of: (a) the due date for filing GSTR-9 for FY 2026-27 (31 December 2027), or (b) 30 November 2027 — whichever comes first per Section 16(4). ITC not claimed by that date is permanently lost.

Worked Example: A Mid-Size Repair Shop's Monthly GST Numbers

Shop profile: Ravi's PC Service, Pune. Sole proprietorship. FY 2026-27 projected annual turnover ₹78 lakh (₹50 lakh repair/AMC services + ₹28 lakh spare parts sold outright). Monthly filer.

October 2026 — Output and Input Summary

GSTR-1 due: 11 November 2026. GSTR-3B due: 20 November 2026.

Cost of a 15-Day Late Filing

If Ravi files GSTR-3B on 5 December 2026 — 15 days after due date:

• Late fee: ₹50 per day × 15 days = ₹750 (₹375 CGST + ₹375 SGST)
• Interest on unpaid tax at 18% p.a.: ₹84,744 × 18% ÷ 365 × 15 = ₹628
• Total additional outflow for one month's delay: ₹1,378

Multiplied across 12 months of casual filing, this compounds into ₹15,000–₹20,000 in avoidable costs — plus heightened scrutiny risk.

Annual ITC Benefit in Real Rupees

Across FY 2026-27, Ravi's shop purchases ₹18.5 lakh in spare parts (18% ITC = ₹3.33 lakh), ₹1.2 lakh in tools (₹0.22 lakh ITC), and ₹2.0 lakh in input services — rent, software, courier (₹0.36 lakh ITC). Estimated annual ITC: ₹3.91 lakh — a direct reduction in GST cash outflow that disappears entirely if he delays registration or fails to reconcile GSTR-2B.

E-Invoicing and Billing Compliance for FY 2026-27

Who Must Generate E-Invoices

Taxpayers with aggregate turnover exceeding ₹5 crore in any preceding financial year must generate IRN-stamped e-invoices for all B2B tax invoices, debit notes, and credit notes through the Invoice Registration Portal (IRP) — before or at the time of supply. The signed QR code and IRN must appear on the physical or digital invoice issued to the buyer.

Step-by-step e-invoice workflow:

1. Generate invoice in your GST-integrated billing software (Tally Prime, Zoho Books, ClearTax, or similar).
2. Upload the JSON payload to the IRP — either via direct API integration or the NIC IRP web portal.
3. IRP validates the data, returns a 64-character IRN and a digitally signed QR code.
4. Embed the IRN and QR code on the invoice before sending or printing.
5. The IRP auto-populates GSTR-1 Table 4A/4B — you do not manually re-enter these B2B invoices.

Penalty for non-compliance: ₹10,000 per invoice under Section 122 of the CGST Act. If the omission facilitates tax evasion, the penalty can rise to ₹25,000 per invoice. More immediately, your buyer's ITC is at risk — their GSTR-2B will not auto-populate, and they may deny payment until you regularise.

E-Way Bill

For outward movement of goods above ₹50,000 in value — such as bulk spare-part deliveries to a corporate client — generate an e-way bill on ewaybillgst.gov.in before the goods leave your premises. The e-way bill is separate from the e-invoice; both may be required for the same transaction if your turnover exceeds ₹5 crore. Note that several states have lower intra-state thresholds — verify your state's notification.

Composition Scheme: Running the Numbers Before You Opt In

Section 10(1) — Goods/Manufacturer Rate

Available for registered persons with aggregate turnover up to ₹1.5 crore in the preceding FY, at 1% of turnover. Almost always unsuitable for repair shops because services cannot exceed 10% of total turnover or ₹5 lakh, whichever is higher. A shop earning ₹6 lakh from labour on ₹35 lakh total revenue has already violated this condition.

Section 10(2A) — Mixed/Service Rate

Available to persons ineligible under Section 10(1), provided their preceding FY aggregate turnover did not exceed ₹50 lakh. Rate: 6% of taxable turnover (3% CGST + 3% SGST). No ITC. No inter-state supply permitted.

Quantitative comparison at ₹45 lakh annual turnover:

Composition looks attractive on paper — ₹2.8 lakh in apparent savings. But the critical caveat: composition taxpayers cannot issue tax invoices. Your B2B clients — corporate offices, schools, NGOs buying repair services from you — cannot claim ITC on your invoices. If 30% or more of your revenue comes from registered businesses, you will lose those clients or be forced to price lower to compensate. Run this analysis against your actual customer mix before opting in each April.

Warranty Repairs: The OEM Invoice Puzzle

When a customer brings in a device under the manufacturer's warranty, the repair is billed to the OEM (Original Equipment Manufacturer), not the customer. The GST treatment differs across three scenarios:

Scenario A — Indian OEM (domestic B2B supply): Issue a tax invoice to the OEM at 18% — CGST + SGST if intra-state, IGST if inter-state. The OEM claims ITC. Maintain a separate invoice series (prefix "WR" or similar) for warranty jobs to distinguish them from paid retail repairs in your records and GSTR-9 reconciliation.

Scenario B — Foreign OEM (potential export of service): If you perform warranty repairs for a foreign manufacturer and are reimbursed in convertible foreign exchange, this may qualify as an export of service under Section 2(6) of the IGST Act 2017 — taxable at zero percent if you execute a Letter of Undertaking (LUT) on the GST portal under Rule 96A. Without an LUT, IGST must be charged and a refund claimed — a cash-flow drag. File your LUT for FY 2026-27 on the GST portal before issuing the first such invoice of the year; the portal allows advance filing from 1 April.

Scenario C — OEM ships replacement parts at zero cost: The OEM despatches the part directly; you fit it and return the device. Here, no goods supply originates from your shop to the customer, and no GST is charged to the customer. Document this with the OEM's delivery challan, your job card, and a service completion report. The labour, if reimbursed by the OEM, follows Scenario A or B above.

Common Mistakes and How to Fix Them

1. Single-Line Invoice Without HSN/SAC Split

Mistake: "Computer repair + parts — ₹6,500 @ 18%" as a single invoice line.

Risk: ASMT-10 notice for failure to report HSN/SAC-wise breakup; difficulty reconciling during GSTR-9; audit exposure for misclassification.

Fix: Split every invoice into goods lines (with HSN) and service lines (with SAC). Even if the rate is the same, the separation protects you during classification scrutiny.

2. Claiming ITC on Blocked Inputs

Mistake: Posting ITC on the shop's two-wheeler used for customer pickups, or on a laptop purchased for the proprietor's home use but billed to the firm.

Fix: Before entering any purchase in your ITC register, check against the Section 17(5) list. Blocked items must be expensed to profit and loss — not the credit ledger. Incorrect ITC claims attract interest at 24% per annum on reversal plus potential penalty.

3. Ignoring E-Invoicing After Crossing ₹5 Crore

Mistake: Turnover crosses ₹5 crore in FY 2025-26; owner continues manual GSTR-1 entry in FY 2026-27.

Fix: Monitor cumulative turnover in your GST returns or accounting software monthly. The moment any preceding FY's aggregate turnover has crossed ₹5 crore, e-invoicing is mandatory from the start of the next FY. You cannot generate IRNs retrospectively — each invoice must be uploaded before supply.

4. Cash Receipts Above ₹2 Lakh

Mistake: Accepting ₹3 lakh in cash from a bulk corporate purchase.

Risk: Section 269ST of the Income-tax Act 1961 prohibits receiving ₹2 lakh or more in cash from a single person in a single day or for a single transaction. Penalty under Section 271DA is 100% of the amount received — ₹3 lakh received in cash equals ₹3 lakh penalty.

Fix: For transactions at or above ₹2 lakh, insist on UPI, NEFT, RTGS, or account-payee cheque. No exceptions.

5. Missing the ITC Claim Deadline

Mistake: Waiting until the GSTR-9 filing rush in late 2027 to reconcile FY 2026-27 ITC, only to discover several supplier invoices are still missing from GSTR-2B.

Fix: Reconcile GSTR-2B against your purchase register every month. During October–November 2027, actively chase suppliers who have not yet filed. ITC for FY 2026-27 supplies not reflected in GSTR-2B by 30 November 2027 (or the GSTR-9 due date, whichever is earlier) is permanently forfeited under Section 16(4).

6. Ignoring the Margin Scheme on Second-Hand Goods

Mistake: Buying used laptops from individuals (no GST charged by seller), refurbishing them, and then charging 18% GST on the full selling price — effectively cascading tax that was never paid on input.

Fix: Under Rule 32(5) of the CGST Rules, dealers in second-hand goods may pay GST on the margin only (selling price minus purchase price), provided no ITC was claimed on the purchase. The invoice must state "Margin Scheme under Rule 32(5)" and must not show GST as a separate line to the buyer — the tax is embedded. Maintain a dedicated margin-scheme register with serial-number-wise purchase and sale records.

Key Takeaways

• Register at ₹20 lakh aggregate turnover, not ₹40 lakh — most repair shops are mixed suppliers where the lower services threshold controls; missing this triggers retrospective tax demands with interest.
• Charge 18% across all taxable supplies — hardware (HSN 84/85), repair services (SAC 998713), AMC, and installation all fall at the same rate, but always separate HSN and SAC lines on every invoice.
• Claim ITC on every eligible input — spares, tools, workshop rent, software, courier costs. At ₹60–80 lakh turnover, annual ITC realistically reaches ₹3–4 lakh; failing to register or reconcile GSTR-2B throws this away.
• Respect Section 17(5) absolutely — ITC on vehicles, personal electronics, and staff food is permanently blocked; incorrect claims attract 24% interest and penalty on reversal.
• Enable e-invoicing the moment your historical turnover crosses ₹5 crore — missing this exposes every B2B buyer's ITC and opens you to ₹10,000-per-invoice penalties.
• Run the composition scheme numbers against your actual customer mix — Section 10(2A)'s 6% rate saves cash only if the majority of your revenue is from end-consumers; B2B-heavy shops lose clients who need ITC on your invoices.
• Keep warranty and paid-repair invoice series strictly separate, execute an LUT before the first export-of-service invoice to a foreign OEM, and document every replacement-parts receipt with the OEM's delivery challan — these three habits turn a warranty repair programme from an audit liability into a clean, defensible record.