Consultant Invoice Template

Your consultancy's name and registered address, the client's legal entity name, the purchase order or engagement reference, a unique invoice number, issue and due dates, a line per phase or period with the deliverable named, reimbursable expenses on separate lines, any tax, the total due, and payment details. Corporate accounts payable matches on the PO number and entity name, so both must be exact.

Invoice at the start of the period it covers, with one line naming the period explicitly (“Advisory retainer, March 2026”). If the retainer covers a set number of days, state the cap in the description and invoice any overage as a separate line at your day rate, so the client can see the base fee and the excess independently.

Yes, but on separate lines under their own heading. Combining them into a single figure makes reconciliation impossible for the client and usually triggers a query. Bill expenses at cost unless your contract permits a handling fee, and attach receipts if the engagement letter requires them.

Net 30 from the invoice date is standard for corporate work; smaller clients often accept Net 14. What matters more than the number is invoicing on a predictable monthly date and hitting the client's payment batch cut-off. State the due date as an actual calendar date on the invoice rather than only as a term.

Almost always a mismatch rather than a dispute: a missing or wrong purchase order number, the trading name instead of the legal entity on the PO, line descriptions that do not correspond to the PO lines, or an expense above the approved threshold with no approval referenced. Fixing those four things clears most rejections before they happen.

You can, and consultants increasingly do for substantial discovery work, but it has to be agreed before the work; a scoping fee first appearing on an invoice reads as a bait and switch. The common structure is a paid discovery engagement invoiced separately, with the fee credited against the main project if the client proceeds; put that credit on the project invoice as a discount line so it is visible.

25 to 50% upfront is common for a new engagement, invoiced separately before work begins. Beyond covering early costs, it screens out clients who will not follow through on payment later.

Retainers commonly run from a few thousand dollars a month into the low five figures, depending on scope and seniority. Whatever the figure, invoice it as one recurring line naming the period it covers, ideally on the same date every month.

Yes, whenever the engagement has one, put it next to the PO number. Corporate accounts payable teams often cannot process an invoice they cannot match to an approved SOW or contract line.

A small discount, for example 1% off if paid within 10 days instead of 30, can pull payment forward from slow corporate payers, but it has to be stated on the invoice and agreed in the engagement terms beforehand, not applied retroactively.