Free Consulting Invoice Template (Fillable PDF, Word, Excel)

What is on the page

Client PO number

Large clients will not pay an invoice without the purchase order number their system issued for the engagement. Ask for it before the first invoice; it belongs in the header, not in the notes.

Engagement / SOW reference

The statement of work or master agreement the invoice bills against. Accounts payable matches invoice lines to the SOW's milestones or rate card.

Fees by consultant

Name, title or level, hours and the rate from the rate card. Clients audit this against the SOW, so use the exact titles it uses.

Reimbursable expenses

Travel, lodging, per diem, software and materials, billed at cost with receipts, unless the SOW sets a flat expense allowance or percentage. Per diem at the GSA rate avoids receipt arguments.

Milestone fee and acceptance

On fixed-fee work, each milestone carries a percentage of the fee and becomes billable when the client accepts the deliverable. Record the acceptance date and reference (email, sign-off form).

Previously invoiced / remaining

Running totals that let the client reconcile the engagement without pulling earlier invoices. Reduces payment queries more than anything else on the page.

Remit-to

Where to send the payment, if different from your office address. Many AP systems key vendors by remit-to; keep it identical on every invoice.

Choosing the billing model

• Time and expenses: assessments, interim roles, open-ended advisory. Transparent, and the client controls the spend; the trade-off is that every hour is visible and discussable.
• Fixed-fee milestones: defined deliverables (a strategy, a model, an implementation). Predictable for the client, rewards efficiency for you, and acceptance criteria in the SOW are what make it work.
• Retainer: ongoing access for a fixed monthly fee, with a cap on days or hours and a rate for anything beyond. The usage box keeps both sides honest.

Why consulting invoices get stuck in accounts payable

Corporate AP teams reject or park invoices for mechanical reasons far more often than for disputes: no PO number, a legal entity name that doesn't match the vendor record, a remit-to address different from the one on file, a line total that doesn't match the SOW milestone, or expenses lumped into fees when the PO has seperate lines for each. A rejected invoice restarts the 30-day clock. Before sending the first invoice on a new engagement, confirm the PO number, the exact vendor name in their system, whether fees and expenses need separate invoices, and the AP email address. The templates put each of those in a labeled box.

How to fill it in

1. Header: your invoice number, dates, the client PO and SOW reference, and the period or milestone covered.
2. Fees: one line per consultant and activity, hours and rate from the rate card; Excel totals. For milestones, one line per milestone with acceptance date, percentage and fee.
3. Expenses: at cost with receipt reference. Attach the receipts or the expense schedule.
4. Tax: most US states don't tax consulting services; the UK, EU, Canada and Australia charge VAT/GST once registered. Enter the rate or 0.
5. Payment block: bank details, terms matching the MSA, and remit-to.
6. Send as PDF to the AP mailbox with your contact copied, titled with the invoice and PO numbers.

Terms that are worth negotiating

Net 30 is standard for consulting with corporate clients; Net 45 and Net 60 are common with larger companies and worth pushing back on for small firms, or pricing in. A mobilization payment (10 to 25% at signing) on fixed-fee work funds the first month. Interest on late payment (1% per month is typical) needs to be in the MSA to be enforceable. And an acceptance clause that deems a milestone accepted if the client does not respond within ten business days prevents fixed-fee invoices from waiting on a reviewer who is on holiday.

Editing the Word and Excel versions

Excel multiplies hours by rate, totals fees and expenses separately, applies tax to fees only and sums the amount due; the milestone version totals the milestones billed, and the retainer version computes days over or under. Replace the payment block with yours and save as a master per client (the PO and SOW rarely change). Keep hours in the timesheet, expenses in the expense form, and the status of every invoice in the client billing tracker.

Questions

Should fees and expenses be on the same invoice?

Ask the client. Many corporate AP systems require separate invoices because the PO has separate lines or expenses are coded to a different account. The time-and-expenses version keeps them in separate tables with separate subtotals, so splitting into two invoices is a copy.

What is a reasonable late fee for consulting?

Interest of 1 to 1.5% per month on the overdue balance is typical in the US and must be stated in the agreement. In the UK, statutory interest (Bank of England base rate plus 8%) applies to late commercial payments by default.

Do consultants charge sales tax?

In most US states, no: professional services are exempt. A few states (for example Hawaii, New Mexico, South Dakota, West Virginia) tax services broadly. Outside the US, VAT or GST applies once you're registered. Enter the rate or leave it at 0.

How do I invoice a milestone the client has not formally accepted?

Point to the acceptance clause in your SOW. If it provides deemed acceptance after a set period with no objection, invoice and reference the clause; otherwise request written acceptance first. Recording the acceptance reference on the invoice prevents the dispute later.

What should the invoice number look like?

Any unique sequential scheme; a firm prefix and year (CV-2026-112) is common. Never reuse a number, and never skip to a higher number for a client to seem busier; AP systems and auditors notice gaps.