Consulting invoice template you can fill in online
Reviewed in November 2026
A consulting invoice bills advice by the day or the hour. Retainers and milestones get their own lines. Each line points back to the engagement letter. Travel and other costs go at actuals. The sheet above opens with a Mumbai firm billing a food company for November.
Consulting invoice
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What it includes
- Firm name, address and registration
- Invoice number and date
- Client name and address
- Engagement letter reference and PO number
- Service period
- Fee lines: workshop days, hours, retainer, milestones
- Expenses at cost
- Total, tax and due date
- Payment instructions
Consulting invoice: full text
CONSULTING INVOICE
[Arora Advisory LLP]
[Bandra Kurla Complex, Mumbai] · [Phone] · [Email]
[GSTIN, if registered] · LLPIN: [number]
Invoice no.: [ARA-2026-031]
Date: [30 November 2026]
Due date: [30 December 2026]
Client:
[Greenfield Foods Pvt Ltd]
[Andheri East, Mumbai]
Engagement letter: [EL-2026-09] · PO: [4500178]
Service period: [1 to 30 November 2026]
Description Qty Rate Amount
[Discovery workshop, per day] [2] [40,000] [80,000]
[Process review and report, per hour] [24] [4,000] [96,000]
[Monthly advisory retainer, November] [1] [75,000] [75,000]
[Board presentation preparation, per hour] [6] [4,000] [24,000]
[Travel to client site, at cost] [1] [8,600] [8,600]
[Milestone 2: implementation plan delivered] [1] [1,20,000] [1,20,000]
Subtotal [4,03,600]
[GST, if registered] [amount]
TOTAL DUE [₹4,03,600]
Payment instructions
[Bank name] · A/c [number] · IFSC [code]
Please quote the invoice number in the transfer.
Terms
Fees as per the engagement letter. Payment within [30] days.Four ways consultants bill
| Model | Line on the invoice | Fits |
|---|---|---|
| Day rate | Discovery workshop, 2 days | Workshops and on-site reviews |
| Hourly | Process review, 24 hours | Open-ended analysis |
| Retainer | Monthly advisory, November | Ongoing access to the consultant |
| Milestone | Implementation plan delivered | Fixed scope projects |
One engagement can mix all four. Write each line with the model it follows. The client's finance team checks each one against the letter.
A month of consulting fees
Arora Advisory runs a process project for Greenfield Foods. The November invoice covers these lines.
| Line | Basis | Qty | Rate (₹) | Amount (₹) |
|---|---|---|---|---|
| Discovery workshop | per day | 2 | 40,000 | 80,000 |
| Process review and report | per hour | 24 | 4,000 | 96,000 |
| Monthly advisory retainer, November | month | 1 | 75,000 | 75,000 |
| Board presentation preparation | per hour | 6 | 4,000 | 24,000 |
| Travel to client site | at cost | 1 | 8,600 | 8,600 |
| Milestone 2: implementation plan delivered | milestone | 1 | 1,20,000 | 1,20,000 |
| Total before tax | 4,03,600 |
Fees come to ₹3,95,000. Travel at cost adds ₹8,600. A registered firm adds GST at the rate its accountant confirms.
What a consultancy invoice format must show
| Field | Example |
|---|---|
| Engagement letter reference | EL-2026-09 dated 1 September |
| Client purchase order | PO 4500178 |
| Service period | 1 to 30 November 2026 |
| Milestone name | Milestone 2, implementation plan |
| Hours or days per line | 24 hours, 2 days |
| Expenses at cost | With bills attached |
| Payment terms | 30 days from the invoice date |
Large companies match the PO number before they release payment. An invoice without it often waits for a full cycle.
Retainer, milestone and balance over WhatsApp
Consultants often take a mobilisation advance at signing. Retainers bill at the start of each month. Milestones bill when the client signs off the deliverable.
| Payment | When to invoice | Typical terms |
|---|---|---|
| Mobilisation advance | On signing the letter | Due on receipt |
| Monthly retainer | First working day of the month | 15 to 30 days |
| Milestone fee | On written sign-off | 30 days |
| Final balance | Close of engagement | 30 days |
Send the invoice to the client lead with this message. Copy accounts payable.
Hello Kavita. Milestone 2 was signed off on 28 November. Invoice ARA-2026-031 for ₹4,03,600 plus GST is attached. It covers November fees, the retainer and the milestone. PO 4500178 is quoted. Payment is due by 30 December. Regards, Rahul Arora.
Ask for the sign-off in writing before billing a milestone. The written yes travels with the invoice to accounts.
A timesheet summary under the invoice
Finance teams approve hourly lines faster with a short summary. Put it under the invoice or attach it as a second page.
| Date | Consultant | Task | Hours |
|---|---|---|---|
| 4 Nov | R. Arora | Interviews with plant managers | 6 |
| 7 Nov | S. Iyer | Process mapping, dispatch | 8 |
| 12 Nov | S. Iyer | Data review, inventory | 6 |
| 18 Nov | R. Arora | Draft report and findings | 4 |
| 25 Nov | R. Arora | Board deck preparation | 6 |
| Total | 30 |
The 30 hours match the two hourly lines on the invoice. Twenty-four hours went to the review and six to the board deck.
Keep the task names plain. The client lead forwards this page to finance without rewriting it.
Engagement letter to first invoice
The engagement letter sets every number on the invoice. Read it again before the first bill goes out.
- Note the fee model for each part of the scope.
- Copy the client's legal name exactly as the letter shows it.
- Ask procurement for the PO number before work starts.
- Agree who approves timesheets and milestones on the client side.
- Set the invoice date for retainers and the payment terms.
Save these details as the first invoice. Every later invoice then starts from a copy with the right names.
Errors that slow consulting payments
- No PO number. Corporate accounts payable returns the invoice unpaid.
- Milestone billed before sign-off. The client holds the whole invoice.
- Hours without a task. «Consulting, 24 hours» triggers a request for timesheets.
- Travel marked up without saying so. Bill it at cost with receipts.
- Retainer billed late in the month. Bill it on the first working day.
- Rate different from the letter. Any change needs a written amendment first.
Makatea follows up with accounts payable
Consulting invoices sit in approval queues for weeks. Makatea sends a WhatsApp or email reminder before the due date and after it.
Makatea records each payment against its invoice. Your receivables list shows which client still owes for which month or milestone.
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Free on Makatea: proforma invoice template · rent receipt template · free receipt template · free invoice generator
Frequently asked questions
What goes on a consulting invoice?
Your firm details with the client PO and engagement reference. Then each fee line with its basis and the total due. Add expenses at cost on separate lines.
How do I invoice a consulting retainer?
Bill it at the start of each month as one line with the month name. Bill extra work beyond the retainer on separate lines.
When should I bill a milestone?
After the client signs off the deliverable in writing. Quote the sign-off date in the message.
Can I bill hours and days on the same invoice?
Yes. Write the basis on each line. Workshops by the day and analysis by the hour can sit together.
Should travel go on the consultancy bill?
Yes, at cost and on its own line. Attach the tickets or hotel bills you paid.
Is this a government e-invoice?
No. It is a commercial invoice for billing and collection. Government e-invoices are issued in the official tax portal.
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