Advisory day rate
Per day
A dedicated day of on-site or remote consulting, often used for workshops and reviews.
Advisory days · Retainers · Reports
Consultant Invoice Generator
Create Professional Consultant Invoices
Consulting is bought as expertise and delivered as time, conversation and documents. The invoice is where that becomes something an accounts department can process.
This generator starts with consulting line items — a workshop, an audit deliverable and follow-up advisory time — ready to re-price for your engagement and download as a PDF.
Loaded with consultant line items you can edit, rename or remove.
What is a consultant invoice?
A consultant's invoice bills a client for advisory work: analysis, facilitation, recommendations and the documents that record them. It is often addressed to a company rather than an individual, which means it passes through an approver and a finance team before it is paid.
That audience shapes the document. References, phases and deliverable names matter more than eloquence, because the person paying it usually was not in the room. An invoice that names the phase, the dates and the output can be approved without a conversation.
How to invoice as a consultant
- Step 1
Confirm the engagement terms
Rate, phase structure, expense policy and any purchase order number before you raise the invoice.
- Step 2
Bill time the way it was booked
Advisory days, hourly analysis or a phase fee. Put the dates in the description for anything time-based.
- Step 3
Price deliverables separately
Reports, models and recommendation documents as their own lines — they are the artefact the client keeps.
- Step 4
Add workshops and facilitation
Sessions delivered on site or online, with preparation time shown if the agreement covers it.
- Step 5
Itemise agreed expenses
Travel and accommodation at cost, within whatever the client's policy permits.
- Step 6
Quote the PO and set terms
Include the purchase order reference, choose Net 30 or your agreed term, and send it to accounts payable directly.
What to include on a consultant invoice
- Your consultancy name, registration details and contact information
- Client company, the engaging manager and the accounts payable contact
- Invoice number, issue date and the engagement or phase reference
- Purchase order number where the client requires one
- Advisory days or hours with dates and the work performed
- Deliverables such as reports, audits or models, named individually
- Workshops and facilitation, including preparation if agreed
- Agreed expenses at cost, payment terms and bank details
Common charges for consultants
Hourly advisory
Per hour
Shorter calls, reviews and analysis outside a booked day.
Phase or project fee
Fixed price
A defined phase such as discovery or diagnostic, priced and invoiced on completion.
Written deliverable
Per document
Audit findings, strategy documents, financial models or recommendation reports.
Monthly retainer
Per month
Ongoing availability, regular reporting or an included block of advisory hours.
Expenses
At cost
Travel, accommodation and research costs incurred for the engagement.
Example consultant invoice
A diagnostic phase invoiced on completion: a workshop, the written audit and follow-up advisory time.
| Description | Qty | Rate | Amount |
|---|---|---|---|
| Discovery workshop — 22 Mar, 4 hrs | 1 | 1,200.00 | 1,200.00 |
| Operations audit and written recommendations | 1 | 2,400.00 | 2,400.00 |
| Follow-up advisory calls (hrs) | 3 | 180.00 | 540.00 |
| Travel and accommodation (expense, at cost) | 1 | 310.00 | 310.00 |
| Subtotal | 4,450.00 | ||
| Tax (15%) | 667.50 | ||
| Total due — Net 30, PO 48221 | 5,117.50 | ||
Tips for getting invoices paid
Get the PO before the work
A missing purchase order is the most common reason a correct consulting invoice goes unpaid for a month.
Invoice at each phase
Phase billing keeps cash flow steady and gives the client a natural checkpoint rather than one large bill.
Send to accounts, copy the sponsor
Your sponsor approves; finance pays. Reaching both at once removes a week of internal forwarding.
Attach the deliverable reference
Naming the report the invoice relates to lets an approver verify it without contacting you.
Common invoice mistakes for consultants
Billing 'consulting services'
An approver who was not in the room cannot authorise an abstraction. Name the phase and the output.
No dates on time-based lines
Days and hours without dates are impossible to reconcile against a client's own calendar.
Unagreed expenses
Travel outside the client's policy is refused after the fact. Confirm limits before booking.
Letting a retainer lapse unbilled
Retainers stop being invoiced the month someone forgets. Bill it on a fixed date.
Frequently asked questions
Should I bill a day rate or an hourly rate?
Day rates suit workshops, site visits and blocks of dedicated time; hourly suits advisory calls and shorter pieces of analysis. Many consultants publish both and use whichever matches how the client booked them.
How do I invoice a consulting retainer?
Name the period and what the retainer secures — for example availability, a set number of advisory hours or monthly reporting. Bill it on the same date each month and list any overage separately.
Can I charge for a written report?
Yes, and it is usually worth doing so as its own deliverable. The report is what the client keeps and circulates internally, so pricing it separately reflects where the value actually lands.
How should expenses be handled?
Travel, accommodation and research costs go on separate lines at cost, ideally within limits agreed in advance. Larger organisations often have an expense policy that governs what they will reimburse.
Do I need a purchase order before invoicing?
For corporate clients, often yes. Ask for the PO number when the engagement is confirmed and quote it on the invoice, otherwise accounts payable may return the document unpaid.
How do I invoice a phased engagement?
Invoice by phase as each is completed — discovery, analysis, recommendations, implementation support. Phase billing keeps cash flow steady and gives the client natural review points.
Related tools and reading
Create your consultant invoice
Edit the line items, add your details and download a clean PDF. Free, no account and no watermark.