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Invoice Generator for Consultants
Consulting invoices should be phase-based, not time-based — clients approve phases, they audit hours.
How consultants should structure their invoices
- Bill by phase or deliverable; hourly billing invites line-by-line scrutiny of your judgement.
- Expenses (travel, software, data) belong on a separate section with receipts referenced.
- Show the purchase order or SOW reference — enterprise AP will reject the invoice without it.
The invoice above already contains the line items most consultants bill for. Adjust the rates to your own, delete what does not apply, and add anything specific to your engagement.
What a consultant invoice must include
- A unique, sequential invoice number — never reuse or skip numbers.
- Your business name and address, plus your tax or registration number if you have one.
- The client's name and address, and a purchase order reference if they use one.
- Each service on its own line with quantity and rate, so the total is auditable.
- Tax shown separately with the rate, and the total clearly stated.
- Payment terms and the due date — not only in your contract.
Consultants invoicing questions
Hourly or fixed fee?
Fixed fee per phase for defined scope; hourly only for advisory retainers where scope cannot be defined.
When should I invoice?
On phase completion, not monthly. Monthly billing on unfinished phases invites "what did I get" questions.
How do I handle scope creep?
Separate change-order invoice referencing a written approval. Never fold it into the next phase invoice — you will lose the argument.