Consulting invoices fail for a different reason than trade invoices. The work is rarely disputed. What kills the cash flow is process: no purchase order number, wrong entity name, submitted after the monthly payment run cut-off, or sent to a person instead of an accounts-payable inbox.
This template handles the three common consulting billing models — day rate, retainer, fixed-fee project — and covers the administrative details that decide whether you are paid in 14 days or 60.
Invoice a client in the next 60 seconds
Day rates, retainers, expenses and tax — all handled. Download a clean PDF with no signup and no watermark.
Key takeaways
This is the highest-leverage advice in the article, and it costs you one email at kickoff:
Structure varies by billing model. Use the section that matches your engagement:
| Description | Days | Rate | Amount |
|---|---|---|---|
| Strategy workshop facilitation — 12–13 Sep | 2.0 | $1,400 | $2,800 |
| Stakeholder interviews and analysis — 16–19 Sep | 3.5 | $1,400 | $4,900 |
| Findings report and presentation — 24 Sep | 1.0 | $1,400 | $1,400 |
Half-days should be shown as 0.5, not rounded up silently. Clients notice, and it builds the trust that makes the next engagement easier to sell.
| Description | Period | Amount |
|---|---|---|
| Advisory retainer — up to 20 hours/month | 1–31 Oct 2026 | $4,000 |
| Additional hours beyond retainer (3.5 hrs @ $220) | 1–31 Oct 2026 | $770 |
Always show retainer overage as its own line. Silently absorbing it teaches the client the retainer is unlimited; silently adding it to the base fee looks like a price rise.
| Description | Stage | Amount |
|---|---|---|
| Operating model review — contract MER-2026-14 | Milestone 2 of 3: current-state assessment | $9,500 |
| Less: deposit received 4 Aug 2026 | -$4,750 |
Retainers, day rates, expenses — one tool
Build the invoice, apply tax, and download the PDF. Free every time, however many clients you bill.
Put expenses in a clearly separate section under the fee subtotal, with a reference to the receipt pack you are attaching. Three rules:
Corporate clients will usually push Net 30 or Net 45 and mean it — their systems are configured that way and your contact has no power to change it. What you can negotiate:
Full detail in invoice payment terms explained, and if an invoice does go past due, how to politely ask for payment has scripts that work on corporate AP teams.
Cross-border consulting adds two wrinkles: which country’s tax applies to the service, and who bears the currency conversion cost. State the invoice currency explicitly, agree who absorbs bank charges before the first payment, and if you are billing within the EU check the reverse-charge rules in EU VAT invoice requirements.
Match whatever your contract states. If you agreed a day rate, invoice in days — converting to hours invites the client to audit your time. If you agreed hourly, invoice hourly and keep a defensible time log.
25–50% on the first engagement with a new client, or on any fixed-fee project. Established clients on rolling retainers usually do not require one.
If the client issues purchase orders, yes — and prominently. Many AP systems match invoice to PO automatically and reject anything unmatched without a human ever seeing it.
Bill the full retainer. That is what a retainer is — it reserves your availability. If you routinely refund unused hours you have an hourly arrangement, not a retainer, and you should price it as one.
Create your consulting invoice
Free, unlimited, professional PDFs — with your logo and your payment terms.