Invoicingforgoodsvsservices
The invoice looks the same. The timing, the paperwork around it and the classification underneath it do not.
5 minute read · Updated
Short answer
The main differences are timing, copies and classification. For goods, the invoice is issued on or before removal or delivery, in triplicate, and carries HSN codes; for services it is issued within 30 days of supply — 45 for banks, insurers and other financial institutions — in duplicate, and carries SAC codes. Goods moving without a supply need a delivery challan rather than an invoice, and place of supply is determined by delivery destination for goods but generally by the recipient's registered location for B2B services.
Side by side
| Goods | Services | |
|---|---|---|
| Issue by | On or before removal or delivery | Within 30 days of supply |
| Copies | Triplicate | Duplicate |
| Classification | HSN | SAC |
| Place of supply | Delivery destination | Recipient's registered location (B2B, generally) |
| Quantity and unit | Essential | Often notional — hours, months, or blank |
| Movement document | Delivery challan where no supply occurs | Not applicable |
Financial institutions get 45 days rather than 30 for services. Continuous supply of either has its own timing tied to the statement period or the due date it covers.
The deadline is the practical difference
For goods the invoice has to exist before the goods move. That makes invoicing part of despatch rather than part of accounting, and it is why goods businesses invoice continuously while service businesses tend to batch at month end.
For services the 30-day window is generous enough that people use all of it, which is a habit worth breaking. A fortnight of batching is a fortnight of ageing added for no reason other than convention.
Quantity on a services invoice
A services invoice still has quantity and unit fields, and using them well is what makes the invoice checkable.
- Hourly work — quantity 12, unit “hrs”, rate per hour.
- A retainer — quantity 1, unit “month”, with the period in the detail line.
- A fixed-price deliverable — quantity 1, no unit, rate equal to the price.
- Per-unit services — quantity 40, unit “images”, rate per image.
The temptation with fixed-price work is to leave quantity blank and put the whole amount in the rate. That works, but a quantity of 1 with a clear description reads better to the person approving it and matches how their system expects a line to look.
The reference
Invoice format in India
Tax invoice, bill of supply, proforma, quotation, receipt, credit note and delivery challan — what each one is for, what it must contain, and when to issue which.
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Questions people ask
Within 30 days of the supply, extended to 45 days for banks, insurers and other financial institutions. For goods the invoice must exist on or before removal or delivery, which makes it part of despatch rather than part of month-end accounting.
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