Free consulting invoice generator
Bill retainers, day rates, hours and pass-through expenses on one document that ties back to your statement of work — and download it as a PDF that clears procurement first time.
Build your consulting invoice
Prefilled with a typical monthly advisory bill. Replace the details with your engagement and download the PDF.
| Description | Qty | Rate | Amount |
|---|
What is a consulting invoice?
A consulting invoice bills professional advice and expertise rather than a physical deliverable. The value is in judgement, so the invoice has to do something a product invoice never needs to: make intangible work legible to a finance team that was not in the room.
That means naming the engagement, referencing the statement of work or contract that authorised it, and describing each line in the client’s language — the workstream, the deliverable, the period covered. “Advisory services — $12,000” gives a controller nothing to approve against.
Consulting invoices also travel further inside a client organisation than most. They are routed through procurement, matched against a purchase order, and often reviewed by someone who has never met you. Every reference number you include shortens that journey.
What to include
Everything below is already in the generator above — this is what each part is for.
Engagement and SOW reference
The project name plus the SOW or contract date it sits under, so the invoice can be matched to an approved scope.
Purchase order number
If procurement issued a PO, it belongs on the invoice. Many AP systems will not process a professional-services bill without it.
The billing basis per line
Retainer for a named month, day rate with the number of days, or hours at your rate — one basis per line, never blended.
Period covered
The month, sprint or phase this invoice covers. Retainers in particular need the month stated explicitly.
Expenses, clearly separated
Travel, lodging and subscriptions billed at cost or per your SOW markup, on their own lines with receipts referenced.
Terms and remittance details
Net terms, wire or ACH details, and any late-payment provision from the contract restated in plain language.
Three steps to a finished PDF
Add engagement references
Enter your firm, the client’s billing entity, the PO number, and note the SOW in the notes field.
Bill the retainer, days or hours
Add a line per billing basis — retainer, workshop days, advisory hours — then list expenses separately at cost.
Download and submit to AP
Download the PDF and send it to accounts payable, copying your sponsor so approval is not waiting on one inbox.
Structuring consulting fees
Retainer, day rate or deliverable
Retainers bill a fixed amount for a defined scope of access or output each month, which smooths your revenue and the client’s budgeting. Day rates suit workshops, onsite sessions and diagnostic work with a clear start and end. Deliverable pricing works when the output is well specified and the effort is predictable. Most engagements settle into a retainer plus day rates for anything additional.
Bill expenses the way the SOW says
- At cost, with receipts, is the default for travel and lodging.
- If your SOW allows a handling percentage, show it as its own line rather than inflating costs.
- Keep expenses out of your fee lines — mixed lines are the ones procurement queries.
Invoice on a predictable date
Monthly retainers are best invoiced on the same day each month, ideally a few days before the client’s AP cut-off. Ask your sponsor when that cut-off falls: an invoice arriving on the 2nd rather than the 5th can be the difference between being paid this cycle and next.
Make disputes rare and small
Send a short scope confirmation at the start of each period and a one-paragraph summary of what was delivered at the end. When both exist, the invoice is a formality rather than a negotiation, and any disagreement surfaces while it is still cheap to fix.
Three mistakes that delay payment
No PO number
The single most common reason a consulting invoice is returned unpaid by accounts payable.
Blended lines
Fees and expenses on one line cannot be approved or coded, so the whole invoice waits.
Vague retainer lines
A retainer without a named month is impossible to reconcile against a twelve-month contract.