How to use the Consulting Invoice Generator
- Enter your business name and address, and add your company logo if you have one.
- Add your client's details, an invoice number, and the date.
- Edit the pre-filled services: adjust descriptions, quantities, and prices, and add or remove rows to match the job.
- Set any tax or discount, choose your currency, then click Download to save a professional PDF.
Who it's for
Independent consultants and advisory professionals billing by the hour, on fixed project fees, or on monthly retainers, including those invoicing corporate clients who need a clear breakdown for their finance teams.
Frequently asked questions
How do consultants invoice clients?
Consultants typically bill either by the hour, on a fixed project fee, or via a monthly retainer, and often a mix. List each clearly with the period covered. This tool comes pre-set with an hourly line and a retainer line you can adjust.
What are normal consulting payment terms?
Net 15 to Net 30 is standard. Retainers are usually billed in advance for the upcoming month, while hourly work is billed after it's delivered. Stating this on the invoice avoids confusion.
Should I show my hourly rate on the invoice?
Yes. Showing hours × rate is transparent and makes approval faster, especially for corporate clients whose finance teams need the breakdown.
How should I invoice a corporate client?
Corporate finance departments are process driven, so the details matter more than with small clients. Before you invoice, confirm three things: who receives invoices, whether a purchase order number is required, and when the monthly payment run happens. A missing PO number is one of the most common reasons a consulting invoice is rejected outright, and a rejected invoice restarts the entire payment clock. Include the PO number prominently, break your fee into hours and rate rather than a single lump sum, and reference the engagement or statement of work so the approver can match it against what they authorised.
Should I bill a retainer in advance or in arrears?
Retainers are normally billed in advance for the coming month, because the point of a retainer is that you reserve capacity for the client whether or not they use all of it. Hourly or project work on top is billed after delivery. Stating this split explicitly on the invoice avoids a very common confusion, where a client expects the retainer to cover work already done rather than availability going forward. If your retainer includes a set number of hours, show how many were used and whether any overage is being charged, so the arrangement stays transparent month to month.
What if a client disputes my hours?
Prevent it rather than argue it. Send a brief summary of work at the end of each month or each phase, before the invoice arrives, so the client has already seen and implicitly accepted the hours. Disputes almost always come from a client encountering a number for the first time on a bill. Keep line descriptions specific enough that an approver who was not in the meetings can understand what they are paying for. If a genuine dispute does arise, resolve the undisputed portion first and invoice it, rather than holding the entire amount hostage to one contested line.
How do I raise my consulting rates?
Give notice, apply it at a natural boundary such as a new engagement or the start of a quarter, and state the new rate in writing before it appears on an invoice. A rate increase discovered on a bill feels like an error or an opportunistic move, while the same increase announced a month earlier is simply a business decision. You do not need to justify it at length. Existing retainer clients are usually given a longer runway than project clients, since their budgets are set further in advance and a surprise increase can be genuinely difficult for them to absorb.
Related tools and guides
Consultants who also freelance or design can use the freelancer invoice generator or graphic design invoice generator, while private-practice professionals may prefer the therapy invoice generator. For setting terms with corporate clients, see our guide to Net 14 vs Net 30 payment terms.
How your invoice data is handled
Everything in the Consulting Invoice Generator happens on your own device. The details you enter and the finished PDF are created in your browser and never sent to a server, so we cannot see or keep a copy of your invoices. No account is needed. Read our Privacy Policy to learn more.