Consultant Invoice Template & Generator

Whoever approves a consulting invoice is usually holding a statement of work in one hand and a purchase order in the other. The invoice has to agree with both: the same engagement name, the same reference, the same period, and an amount that sits inside what was authorised. Where it does not agree, the invoice is not wrong, but it cannot be approved, and it waits.

That is why the reference fields earn their place on this document more than on almost any other. Put the purchase order number and the engagement name on the invoice even when nobody asked you to. It is the difference between an invoice that is paid on the next run and one that generates an email.

• Engagement or project name, matching the statement of work
• Purchase order number, where the client issues one
• The period the fees cover
• Days or hours at an agreed rate, or the retainer for the period
• Expenses and disbursements as their own lines, with receipts available
• Payment terms and remittance details

A retainer bills for availability over a period and should name the period and what it includes; an unused retainer and an exhausted one look identical on an invoice that only states a figure. A time-and-materials invoice shows the days and the rate, because the client is buying time and will compare it with their own record of meetings. A fixed engagement bills a named stage or deliverable and refers to the agreement that priced it.

Where a retainer and additional work appear on the same invoice, keep them on separate lines. A single line that combines a retainer with overage cannot be checked against either the agreement or the timesheet.

Travel, accommodation, software, research and subcontracted specialist work are commonly passed on at cost. State whether each is at cost or marked up, and keep them out of the fee lines so the client can see what they paid for advice and what they paid for the trip. Where a client agreed a cap or a pre-approval requirement, the invoice should say the cap was observed rather than leave it to be discovered.

How expenses are treated for tax, and whether a client must withhold anything from your fee, depends on where you and the client are. This tool does not decide that for you.

Four lines in the notes field will save more time than any amount of invoice design: what the engagement was, which period this bill covers, that expenses are itemised at cost, and who to contact about a query. The person approving the invoice is not the person you worked with, and they have no context beyond the paper in front of them.

Where a stage of the engagement is complete, say so. Where it is not, and the invoice is for a portion, say that too — a partial invoice that looks like a final one is the most common reason a consulting payment is held.

If you quoted or estimated the engagement here, start from that document and convert it rather than retyping the scope. The client, the lines and the reference carry across, and the invoice takes its own number in sequence. The quotation and the invoice then both exist, which matters when a client asks what was agreed before the work started.

This tool produces a business invoice. It is not legal, tax or accounting advice, and it does not determine when a supply is taxable or where it is taxed.