Consulting Invoice Generator — Bill Like a Top-Tier Firm

For retainer billing, create a recurring invoice at the start of each billing period (monthly is most common). Include the retainer amount, the covered period, the number of hours included, and a note about overage rates if the client exceeds the allotment. If you track hours against the retainer, include a usage summary showing hours used vs. hours remaining.

It depends on the engagement. Hourly billing works well for advisory roles, ongoing strategy work, and open-ended engagements where scope evolves. Project-based billing is better for defined deliverables like an audit, a report, or a training program. Many consultants use a hybrid — a project fee with hourly billing for scope changes. Invoita supports all three formats.

Add reimbursable expenses as separate, clearly-labeled line items (e.g., 'EXPENSE: Round-trip flight SFO-JFK, $487' or 'EXPENSE: Client dinner, 4 attendees, $312'). Reference the expense policy in your contract and note on the invoice that receipts are available upon request. Keep expenses visually distinct from consulting fees so the client can process them separately if needed.

Net 15 or Net 30 are standard for consulting. For new clients, Net 15 or even Due on Receipt reduces risk. For retainers, billing at the start of the month with payment due immediately is common. Large project engagements often use milestone billing — 25% upfront, 50% at midpoint, 25% at completion. Always specify terms explicitly on the invoice.

A consulting invoice should include your business name and contact details, the client's company and billing address, a unique invoice number, the engagement or project name, a detailed breakdown of services (description, hours, rate), any reimbursable expenses, applicable taxes, the total amount due, payment terms, and accepted payment methods. Reference the SOW or contract number if applicable.

Yes, 100% free. Create unlimited consulting invoices with detailed time entries, expense tracking, and your firm's branding. Download professional PDFs without signing up, and there are no watermarks or hidden fees.