Question 1

What should a consulting invoice include?

Accepted Answer

A consulting invoice should include: your consulting firm name and contact info, client company name and billing address, a unique invoice number, service dates, a detailed breakdown of consulting services (strategy sessions, workshops, analysis, etc.), hourly rates or retainer fees, reimbursable expenses (travel, materials, software), and payment terms. For retainer clients, note the retainer period and any unused hours that roll over.

Question 2

How do consultants bill for their services?

Accepted Answer

Consultants typically bill using one of three methods: (1) Hourly billing — charge for actual time spent, ideal for advisory and ongoing consulting; (2) Retainer billing — a fixed monthly fee for a set number of hours or ongoing availability; (3) Project-based billing — a fixed fee for a defined deliverable like a market analysis or strategic plan. Many consultants use a combination, with a monthly retainer for ongoing work and project fees for specific deliverables.

Question 3

Should consultants charge for travel time?

Accepted Answer

Most consultants bill for travel time at 50% of their standard hourly rate, though some charge full rate for productive travel time (working during the flight). Always clarify your travel billing policy in your engagement letter or contract. Reimbursable expenses like flights, hotels, and meals should be listed separately on the invoice with receipts attached. Some consultants build travel costs into a flat project fee to simplify billing.

Free Consulting Invoice Template

Live Generator

Invoice Details

Bill To

Line Items