Consultant invoice template

Consultants usually bill larger amounts to companies that run approvals, purchase orders and payment cycles. Your invoice should make that easy: clear scope, a PO number, a day rate or fixed fee, and explicit terms. Use the example below and open it in the generator.

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Example consultant invoice

Description	Qty	Rate	Amount
Process audit workshop (days)	2	$1,200.00	$2,400.00
Written recommendations report	1	$900.00	$900.00
Follow-up call (hours)	1	$200.00	$200.00
Subtotal			$3,500.00
Total			$3,500.00

Sample figures only. Replace them with your own in the generator.

What to include

The client's PO number or contract reference
The engagement period and what was delivered
Day rate or fixed fee and the number of days or milestones
Expenses listed separately, with receipts available
Payment terms such as net 30, and any late-payment terms
Your tax or company registration number when required

Common mistakes

Missing the PO number, which makes finance teams send the invoice back.
Billing against a vague engagement instead of the agreed scope.
Mixing expenses into the fee without a breakdown.
Sending the invoice to the wrong contact instead of the accounts payable address.

Practical tips

Ask at the start who receives invoices and whether there is a vendor portal or a required format; large clients often have one. For retainers, invoice at the start of the period and label it with the month. For milestones, tie each invoice to a deliverable the client has accepted. Net 30 is common, but you can ask for net 14 or a deposit when the engagement begins.

Frequently asked questions

What payment terms should a consultant use?

Net 14 or net 30 are common. For new clients or large projects, ask for a deposit or milestone payments.

Why do clients ask for a PO number?

Many companies match invoices to purchase orders before paying. Without it, payment can be delayed.

How do I bill a retainer?

Invoice at the start of each period with a clear label such as "Advisory retainer, October" and the agreed monthly fee.

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Last reviewed: October 2026. This page is general information, not legal, tax or accounting advice. Rules and rates change, so check your local tax authority before relying on it.