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Consulting Invoice Template

A consulting invoice has to show how each amount was worked out under the engagement the client signed. Consultants bill in four ways, often for the same client: hours times an hourly rate, days times a day rate, a monthly retainer for reserved time, and a fixed project fee split into milestone payments. This template gives each its own kind of line, so a reviewer can check it against the engagement letter: the basis (hours, days, retainer month or milestone), the quantity, the rate and the amount. It adds what consulting invoices are usually held up for: the engagement letter or proposal reference, the client's purchase order and accounts-payable contact, the service period, the dates behind any time billed, and travel passed through at cost with receipt references. For IT, security, coaching or PR engagements, the linked templates carry the fields those clients ask for. The download is an editable HTML invoice with invoice number, dates, a line-item table and totals. Fill it in your browser and print it or save it as PDF, or type or say what you billed and InvoiceQuickly drafts an editable invoice for you to check before saving.

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Download the HTML file to edit its fields, then print or save as PDF. Totals are entered manually.

What This Template Includes

  • Engagement letter or proposal reference and date
  • Client purchase order number and accounts-payable contact
  • Service period, or the milestone being billed
  • Fee basis on each line: hours × rate, days × day rate, retainer or fixed fee
  • Milestone number and share of the project fee (for example 2 of 3, 30%)
  • Retainer: time included, time used and any extra time billed
  • Dates and tasks behind hourly or daily lines
  • Travel and other expenses at cost, with receipt references
  • Not-to-exceed cap and amount billed to date, if the agreement sets one
  • Late-payment clause from the engagement letter

How to Create Your Consulting Invoice

  1. 01

    Describe your work

    Type a plain English description of the services you provided, the client, and the amount.

  2. 02

    AI generates your invoice

    InvoiceQuickly's AI drafts the client, line items, dates, and totals for you to review before saving.

  3. 03

    Review, download, and send

    Check every detail, download the PDF, or use Pro to email the PDF directly to your client.

Recommended Payment Terms

Use the payment terms in your engagement letter and print the actual due date on the invoice, not only 'net 15'. Common choices are net 15 or net 30. Project fees are usually split into stages the client can see, for example 40% on signing, 30% after a workshop and 30% on handover, with each stage billed on its own invoice when it is reached. Retainers are billed on the same day each month, often in advance for the month of reserved time, with any extra time billed at the agreed rate on the next invoice. Larger clients pay through accounts payable: before the first invoice, ask who it goes to, whether a purchase order number must appear and whether they need a supplier form or Form W-9. If the agreement sets a late fee, quote the clause number on the invoice and check the rules where you work before charging it.

Need help writing payment terms? Read our guide to invoice payment terms for best practices and templates.

Tax Information

United States: whether consulting is subject to sales tax depends on the state and on what is delivered. Not every state taxes professional advice, and some tax services broadly; New Mexico, for example, applies gross receipts tax to services performed in the state. Check your state revenue department instead of assuming. A US business that pays you $2,000 or more for services in 2026 generally reports it on Form 1099-NEC (the threshold was $600 for payments made before 2026), so clients ask for Form W-9 before the first payment. United Kingdom: charge VAT only if you are VAT registered, which is compulsory once taxable turnover for the last 12 months passes £90,000, and a VAT invoice must show your VAT registration number. For cross-border clients, the place-of-supply rules decide whether VAT applies. InvoiceQuickly applies one tax percentage per invoice, calculated on the discounted subtotal, and copies your saved business tax ID to new invoice PDFs; check the saved IDs and PDF before sending when it must appear. General information, not tax advice.

Industry context (2026)

There is no public, dated survey of independent consultants' rates that we could verify, so this page does not quote market rates. The nearest official figure is for employees: the US Bureau of Labor Statistics Occupational Outlook Handbook reports a median annual wage of $101,860 for management analysts in May 2025 ($48.97 an hour), with about 1,077,100 jobs in 2025 and 14% of them self-employed. Employee pay is not a consulting rate, because an independent consultant also covers unbilled time, overheads, benefits and self-employment tax. Two rules shape the paperwork rather than the price. In the US, payments of $2,000 or more for services made after 31 December 2025 are generally reported on Form 1099-NEC (previously $600), according to the IRS. In the UK, a VAT invoice must carry the supplier's VAT registration number, and registration is compulsory above £90,000 of taxable turnover in 12 months (GOV.UK). Figures checked on 27 and 28 October 2026; general information, not tax advice.

Worked example

Worked example (illustrative rates, consistent with our guide to pricing consulting; not market data): an independent operations consultant with a $175 working hourly rate and a $1,400 day rate (8 × $175) runs a 14-day process review for a regional distributor at a fixed $23,000, billed 40% on signing, 30% after the workshop and 30% on handover, followed by implementation support on a $3,000 monthly retainer covering up to 2 days, with extra days at $1,400. Invoice INV-0031, dated 15 April 2026, net 15, due 30 April. Line 1: process review, milestone 2 of 3, workshop delivered 14 April, 30% of $23,000 = $6,900.00. Line 2: rail travel for the workshop, at cost, receipt 7781, $142.50. Line 3: hotel, 1 night, at cost, receipt 2209, $186.00. Subtotal $7,228.50, tax 0%, total due $7,228.50. Notes: 'Proposal of 3 March 2026, PO 55120. Billed to date: $16,100 of $23,000.' Three months later, invoice INV-0037 covers the first retainer month with overage: line 1, implementation support retainer, July 2026, up to 2 days, $3,000.00; line 2, additional day beyond the retainer, 1 × $1,400.00. Total $4,400.00. The checks behind the numbers: 40% + 30% = 70%, and $9,200 + $6,900 = $16,100 billed to date, leaving $6,900 for handover. Expenses stay off the fee lines, so the $23,000 fee never changes on paper. The retainer works out to $1,500 a day, above the $1,400 day rate, because the time is reserved whether or not it is used.

Common mistakes to avoid

'Consulting services: $7,228.50'

One round line forces the client to ask what it covers. Split fees from expenses and name the basis of each fee: hours, days, retainer month or milestone.

Billing a milestone before it is reached

If the proposal says 30% after the workshop, invoice it after the workshop. An invoice for a stage that has not been reached can be rejected by accounts payable and has to be reissued.

Retainer invoices that hide overage

Adding extra days into the retainer line makes the monthly fee look changed. Keep the retainer amount fixed and put extra time on its own line with the agreed rate.

Travel folded into fees

Unless the engagement letter says travel is included in the day rate, bill it at cost on separate lines with receipt references, so it can be approved on its own.

No engagement reference or PO

Larger clients match invoices to an engagement letter and purchase order. Missing either can send the invoice back and restart the payment clock.

Invoicing Tips

  • 1Name the fee basis in each description: 'Advisory, 6 to 10 April, 12.5 hours × $175' or 'Process review, milestone 2 of 3, 30% of $23,000'. The client checks hours against your log and milestones against the proposal.
  • 2Bill a fixed project in stages the client can see, and say which stage each invoice is: 'Milestone 2 of 3, workshop delivered 14 April'. Never bill the next stage before the last one is signed off.
  • 3On a retainer invoice, show what the month includes and what was used ('up to 2 days; 3 days used'), then bill the extra day on its own line at the agreed rate.
  • 4Pass travel through at cost on separate lines with receipt references, unless your engagement letter builds travel into the day rate. Say which in the agreement.
  • 5If the agreement has a not-to-exceed cap, print 'billed to date' on every invoice so neither side is surprised when the cap is near.
  • 6Send each invoice to the accounts-payable contact with the PO number, not only to the executive who hired you.

Related Resources

Frequently Asked Questions

What should a consulting invoice include?

Your business name and contact details, the client's name and billing address, a unique invoice number, the invoice date and due date, the engagement letter or proposal reference, the service period or milestone, one line per fee with its basis (hours, days, retainer or fixed fee), expenses at cost, tax if you are registered to charge it, the total and how to pay. Add the client's purchase order number if they use one.

Should a consultant bill by the hour or by the day?

Bill the way the engagement letter says. Hourly suits short advisory calls and unpredictable work; a day rate suits on-site or workshop days and is simpler to check. Many consultants derive one from the other, for example an 8-hour day at a $175 working rate is a $1,400 day rate. State whether travel time counts.

How do I invoice a consulting retainer?

Invoice the agreed monthly fee as one line on the same day each month, name the month and what it reserves (for example 'up to 2 days'), and bill any extra time on a separate line at the agreed rate. Say in the agreement whether unused time rolls over.

How do I invoice a fixed-fee consulting project?

Split the fee into milestones in the proposal, then issue one invoice per milestone when it is reached. Each line names the milestone, its share and the total fee, for example 'Milestone 2 of 3: 30% of $23,000 = $6,900'. Expenses go on separate lines.

How do consultants bill travel expenses?

Bill agreed travel at cost on separate lines with a receipt reference, such as 'Rail to client site, 14 April, receipt 7781: $142.50'. Add a mark-up only if the agreement allows one, and keep travel out of the fee lines so the client can approve it separately.

Do consultants have to charge sales tax or VAT?

Only where the law requires it. In the US it depends on the state; New Mexico, for example, taxes services performed there. In the UK you charge VAT only if you are VAT registered, which is compulsory above £90,000 of taxable turnover in 12 months. Check the rules where you and your client are.

Can I create a consulting invoice in InvoiceQuickly?

Yes. Type or say what you billed and InvoiceQuickly drafts the client, lines and amounts into an editable invoice you review before saving. There is no milestone schedule, so issue each milestone as its own invoice. Pro includes a timer and manual time entries. Free covers 5 invoices, 5 clients and 3 AI drafts. Pro is $9 a month for unlimited invoices, estimates, recurring invoices, email delivery and payment links through your own Stripe or PayPal account.