How an accountant's engagement turns into invoices
Accounting work normally starts with an engagement letter that names the services, the period and the fee. The fee might be one annual amount split into instalments, a monthly charge for bookkeeping and returns, or a price per filing, with anything outside the letter quoted separately. Each invoice should echo the letter line for line.
- Instalments: label them, for example “Statutory audit FY 2025 to 26, instalment 2 of 3”.
- Monthly compliance: one fixed line per month, naming the month.
- Per filing: one line per return, with the taxpayer and the period.
- Out of scope: catch up work or advisory meetings, billed hourly or at a quoted price.
GST details on an accountant invoice in India
If you are registered for GST, CGST Rule 46 lists the particulars a tax invoice must carry. For a practice billing services, the ones most easily missed are the accounting code of each service, the client’s GSTIN when the client is registered, the place of supply on inter state work, whether tax is payable on reverse charge, and your signature or digital signature.
- GSTIN: 15 characters, starting with the two character state code.
- Serial number: consecutive and unique for the financial year, using letters, numbers, hyphens or slashes.
- Tax split: CGST and SGST for a client in your state, IGST for a client in another state.
- Timing: a services invoice is due within 30 days of the date of supply, and is prepared in duplicate.
The sample uses 18%, the standard rate. Confirm the rate for your service code, and see our India GST invoice format for the full list.
Accounting invoice template lines with example fees
These lines cover a small practice’s regular work for a business client. Fees are examples only, in rupees before GST, and real fees depend on the client’s size, the volume of entries and your city. Notice that each line names a period or a volume, which is what the client checks first.
| Service | Billing basis | Example fee |
|---|---|---|
| Statutory audit, instalment 2 of 3 | Engagement fee in parts | ₹45,000 (example) |
| Bookkeeping, October, up to 150 entries | Monthly fixed | ₹8,500 (example) |
| Entries above 150 | Per entry | ₹40 (example) |
| GST return filing for the month | Per month | ₹3,000 (example) |
| Payroll processing | Per employee per month | ₹250 (example) |
| Income tax return, proprietor | Per return | ₹6,000 (example) |
Billing monthly bookkeeping without arguments
A bookkeeping invoice is easiest to approve when the fee is tied to a volume the client can count, such as entries, bank accounts or employees. State the month, the volume included and the rate above it, so a busy month produces a predictable extra line instead of a surprise.
Government fees or challans you pay for a client belong on separate lines with their reference, never folded into your fee. For a fixed monthly arrangement, our retainer invoice shows how to word the period.
Tax preparation invoices in filing season
A tax preparation invoice is clearer when each return is its own line, with the taxpayer’s name and the assessment year, so a family or group of companies can see who each fee belongs to. Bill when the return is filed and the acknowledgement is shared, and keep revised returns or replies to notices as separate lines priced as agreed.
Mistakes accountants make on their own bills
It is easy to check a client’s invoices carefully and then rush your own. These slips get a bill sent back by the client’s accounts team, and each one takes a minute to fix before the invoice goes out.
- Restarting the number series mid year, which breaks the unique series for the financial year.
- IGST charged to a client in your own state, or CGST and SGST to one in another state.
- A missing client GSTIN on an invoice to a registered client.
- “Professional fees” as the only line, with no period or service named.
Open the sample and make it yours
Download the template here, or load the sample accountant invoice in our free generator. It has an audit instalment, October bookkeeping with extra entries, GST return filing and payroll, using the India preset with CGST and SGST at 18%. Change the state to switch to IGST.
See every invoice template for other layouts. Advisers billing by the day can use the consulting layout, and the legal services invoice shows fees and outlays side by side. Our guide on adding GST to an invoice walks through the arithmetic.
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