Create polished invoices for retainers, milestone billing, time-based engagements, and expense reimbursements. Download a branded PDF that matches the caliber of your advice.
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Monthly retainers sound simple until you need to track hours against the allotment, invoice overages at a different rate, and reconcile unused hours. Your invoice needs to clearly show the retainer fee, usage, and any additional charges — without confusing the client.
Large engagements split into phases require invoices tied to specific deliverables. If your invoice just says 'Phase 2 — $25,000', the client's AP team will ask for a breakdown. Invoita lets you detail exactly what was delivered and why the milestone is complete.
Some clients are on hourly engagements, others are fixed-fee projects, and some have a retainer with hourly overages. Switching between billing models across clients is a formatting headache that a flexible invoice tool eliminates.
Travel, software subscriptions, research materials — reimbursable expenses need to be clearly separated from consulting fees. Vague expense charges get questioned; itemized ones with category labels get approved without a back-and-forth.
Add your consulting firm name, logo, and contact information. Enter the client's company name, billing address, and project or SOW reference.
Add line items for consulting hours (with descriptions, dates, and rates), milestone deliverables, or retainer fees. Add reimbursable expenses as separate clearly-labeled items.
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Include the statement of work number, contract date, or engagement letter reference at the top of each invoice. This connects the invoice to the approved scope and budget, which speeds up AP processing. Clients with multiple consultants need this to route the invoice correctly.
Instead of '40 hours consulting @ $250/hr', break it down: 'Mar 3 — Stakeholder interviews (4 hrs)', 'Mar 5 — Competitive analysis draft (6 hrs)', etc. Detailed time entries justify your rate, prove the work happened, and are required by most enterprise clients.
Use a clear section break or label (CONSULTING FEES / REIMBURSABLE EXPENSES) so clients can process each category differently. Many companies have separate approval workflows for professional services and travel expenses. Making their job easier gets you paid faster.
Invoice your retainer fee on the first of each month for that month's coverage. This aligns with how retainers are structured contractually and ensures you're paid before rendering services, not after. Include the retainer period ('April 2024 retainer') explicitly.
Even if the client didn't exceed their hours this month, note the overage rate on the invoice (e.g., 'Hours above 20/month billed at $275/hr'). This serves as a recurring reminder of the terms and prevents surprise when overages do occur.
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.
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