Bill by the hour, the day, or the retainer — this template handles all three. Clean typography and clear engagement references make it easy for your client's accounts payable team to approve and pay without questions.
| Description | Qty | Rate | Amount |
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Three common models: hourly (hours × rate), daily (days × day rate), or a monthly retainer as a single line. Retainers can include an hours allowance — list overage hours as a separate line so the client sees exactly what's inside and outside the retainer.
A PO or engagement reference on the invoice, your payment details, an itemized breakdown that matches the contract, and a due date that matches their payment cycle (Net 15 or Net 30). Clear invoices get through accounts payable without back-and-forth.
Either works — many consultants bill fees and billable expenses on the same invoice as separate lines, marked "at cost". Note your expense policy in the terms so there are no surprises.