A useful consulting invoice shows how the fee was earned: separate hourly or daily work from fixed-fee deliverables, add a short project note, and give the client a total they can trace back to the engagement.
Consulting charges often look simple to the consultant and opaque to the accounts-payable reviewer. “Advisory services – $4,000” may be correct, but it does not reveal the month, milestone, approved days or project. A few well-chosen line items can prevent a payment delay without exposing confidential working notes.
The form supports quantities, unit prices and optional notes, so the same invoice can cover time, fixed fees and expenses. It does not track time or approve scope changes. Your timesheet, statement of work and client approval remain the source for what you bill.
Create a consulting invoiceCreate a consulting invoice clients can approve
Start with the billing section of your agreement. Identify the period, unit and rate before turning the work into invoice lines.
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Select or add the client
Use the legal client named in the engagement. Save a verified client as a contact so later invoices do not require retyping.
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Separate each billing method
Use hours or days as quantities for time-based work and quantity one for a fixed-fee milestone. Add concise notes for dates or deliverables.
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Confirm terms and generate the PDF
Set a unique number, invoice date, due date and payment method. Compare the total to your timesheet and agreement before download.
Example: strategy project with hourly follow-up
A consultant’s agreement prices the discovery workshop at a fixed $2,500 and follow-up analysis at $200 per hour. During the month, the client approves six analysis hours. The invoice uses one line for the workshop at quantity one and a second line for six hours at the hourly rate.
The line note identifies the project phase and service dates without reproducing confidential recommendations. The total is $3,700. The consultant adds the client’s purchase-order reference, chooses the agreed 30-day due date and checks the PDF against the signed statement of work and approved time record.
- Discovery workshop – fixed fee: 1 × $2,500.
- Follow-up analysis: 6 hours × $200 = $1,200.
- Total consulting fees: $3,700.
Hourly, daily and fixed-fee lines
For hourly billing, quantity is the approved number of hours and unit price is the contractual hourly rate. Daily billing works the same way, but describe what counts as a day if the contract uses partial days. Fixed-fee work is clearer when the line names the actual milestone rather than the generic project.
If one invoice spans several people or workstreams, use separate lines where rates differ. This prevents a blended total from hiding a wrong quantity. Avoid turning the invoice into a raw activity log; keep detailed time records separately and provide them only when required.
- Include the billing period in the line or note.
- Match units and rates to the signed engagement.
- Separate approved extras from the base fee.
- Use the client’s PO or project reference when provided.
Saved contacts for the next project phase
Consulting often produces a series of invoices. Saving the client after the first verified invoice lets you select the same legal name and address on the next one. It reduces typing while preserving room to change the project, dates, rates and line items.
A contact is not a contract. Before every invoice, check whether the purchasing entity, billing address or PO has changed. For a related company in the same group, create or select the correct separate client instead of editing only the display name.
What an invoice cannot establish
The invoice does not authorize out-of-scope work, prove delivery or resolve a disagreement about hours. Retain the contract, approval messages, time records and acceptance evidence. If a fee depends on a success event or complex formula, calculate and document it under the agreement before entering the amount.
Simple Invoicing also does not calculate income taxes, file returns, receive client payment or sync with a time tracker. It turns your verified billing inputs into an organized invoice and PDF.
Related guides and tools
Frequently asked questions
Create a line with the service description, use approved hours as the quantity and enter the contracted hourly rate as the unit price. Add a short period note if useful.
Yes. Put each billing method on its own line so the client can verify the fixed deliverable and the separate hourly calculation.
Follow the agreement and client process. The invoice can summarize approved hours; keep detailed records separately and share them when required.
Yes. Save verified client details as a contact, then review them before each future invoice in case the legal entity or billing instructions changed.
Make the fee easy to trace back to the project
Separate time and deliverables, add concise notes and review the total against your engagement before downloading.
Create a consulting invoice