GST Billing for Mobile and Laptop Repair Shops: A Simple Guide
Understand CGST, SGST, IGST, HSN and SAC codes, B2B and B2C invoices, and practical ways to organise GST billing in your repair business.
GST is one of the biggest headaches for small service businesses. A repair shop usually bills for two different things at once, the service (labour and repair charges) and the goods (spare parts or accessories sold), and each can carry different tax treatment. Getting it wrong can mean compliance notices and unhappy customers.
CGST, SGST and IGST in plain words
- CGST (Central GST) and SGST (State GST) are charged together when the shop and the customer are in the same state. The tax is split between the Centre and the state.
- IGST (Integrated GST) is charged when the sale crosses state lines, for example when a Kochi service center invoices a customer in Bengaluru.
The mistake many shops make is applying the wrong combination. Software that identifies intra-state and inter-state transactions automatically removes this risk.
B2B vs B2C invoices
A B2C invoice is issued to an individual customer and does not need a GSTIN. A B2B invoice is issued to a registered business and must carry the buyer's GSTIN, because that business may claim input tax credit on it. Mixing the two up or leaving the GSTIN off a B2B bill creates problems for your customer at filing time.
HSN and SAC codes
Goods are classified with HSN codes, while services use SAC codes. A repair bill that includes both a screen replacement (goods) and labour (service) should classify each line correctly. HSN-wise summaries are also needed when you file returns, so keeping them organised from day one saves time later.
Common GST billing mistakes in repair shops
- Charging one flat amount without separating parts and labour.
- Using the wrong tax split for inter-state customers.
- Missing GSTIN on B2B invoices.
- Not issuing credit notes when a repair is cancelled or a part is returned.
- Losing track of input GST paid on spare-part purchases.
How Jet Pack automates GST for service centers
Jet Pack is built around the way repair shops actually bill:
- One-click GST invoices for B2B and B2C customers, with itemised billing and tax breakup.
- Automatic CGST, SGST and IGST calculation based on the transaction.
- Job-based billing, so the invoice comes straight from the job sheet.
- Input and output GST tracking with credit and debit notes.
- HSN-wise reports and GSTR-1 data to make filing simpler.
- Excel export so your accountant gets clean data in one click.
The bottom line
GST compliance does not have to eat your evenings. When billing, tax calculation and reporting live in one system, errors drop and filing becomes routine.
Try Jet Pack free and see your first GST invoice in seconds.
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