What should a consulting invoice include?

Your business details; the invoice number and date, payment terms, due date and billing period; the client under "Bill to"; and the engagement with its statement of work. Then your fees on the agreed basis (milestones delivered, hours × rate, or both), any expenses at cost, sales tax where it applies, any retainer applied, the amount due and how to pay.

How should business consultants structure their invoices?

Name the engagement and the statement of work it falls under, so the client can track spending against their budget. Then itemize the work on the basis you agreed: deliverables such as an assessment or a workshop as fixed-fee milestones, and strategy sessions, market analysis or operational reviews billed by the hour in the advisory hours table. Add expenses at cost, then take off any retainer applied.

Should business consultants charge hourly or per project?

Either works; bill on the basis your engagement letter or statement of work sets. Project or milestone fees suit defined deliverables: bill each at its agreed fee once it's delivered. Hourly billing suits advisory work whose scope can change. An engagement can combine them, as the sample does; keep each basis in its own table so the client can see which is which.

How do consultants handle retainer invoicing?

It depends on the kind of retainer. A retainer the client paid in advance is a credit: enter what you're applying on "Less: retainer applied", and say in the billing notes when you received it and how much is left. A monthly retainer fee for availability or a set number of hours is a fee: bill it as a row of its own, track the hours used against the hours included, and bill any extra hours in the advisory hours table at the agreed rate.

What expenses should consultants include on invoices?

Only the expenses the client agreed to cover, such as travel, lodging, meals, research materials or third-party tools bought for the engagement. Bill them in the "Expenses, at cost" table at what you paid, with enough detail to match each to its receipt. They're added below the sales tax line, so they aren't taxed as your fees. Agree any markup or admin fee in writing first and bill it as its own row.

What payment terms should a consulting invoice use?

The terms in your engagement letter. Print them with the invoice date and due date on every invoice; the sample uses Net 30. For new clients or long engagements, an advance retainer or milestone billing keeps unbilled work down. Agree any late fee or interest in writing before you charge it, and check the rules where you work.

Do I need to attach a time log for hourly work?

Only if your agreement or the client asks for one. The advisory hours table shows the dates, hours and rate for each piece of work. Keep your detailed time records so you can answer a query, and send them if the client wants them.

Which format should I download?

Use the PDF for a blank form to fill in by hand. Use the Word or Excel file to type the invoice: both have the same layout with a sample engagement you overwrite. The Excel file calculates the line amounts, subtotals, sales tax, total and amount due; you set the tax rate and the retainer.

Can I invoice consulting clients with Billed?

Yes. In Billed you can log time against tasks and projects and invoice hourly projects from the tracked time, record expenses with their receipts and add the agreed costs to an invoice as line items, let clients pay online by card or PayPal, send automatic reminders for overdue invoices and send recurring invoices for fixed amounts. No credit card is required to start the free trial.

Consulting Invoice Template

A consulting invoice for billing an engagement's fixed-fee milestones and advisory hours, with expenses at cost and any retainer applied, in PDF, Word and Excel

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Quick answer:A consulting invoice bills a client for work delivered under an engagement. It names the engagement and its statement of work, and lists fixed-fee milestones once delivered and advisory hours × rate. Expenses come next at cost, kept out of the taxed subtotal, then sales tax where it applies. Any retainer the client paid in advance comes off the total to reach the amount due. This page has one consulting services invoice as a blank PDF plus Word and Excel files with a sample engagement.

CONSULTING INVOICE

Consultant

Business name:: Example Advisory LLC
Address:: 80 Example Street, Floor 4, Sampletown
Phone / email:: [Phone or email]

Invoice details

Invoice no.:: CS-1207
Invoice date:: Nov 2, 2026
Payment terms:: Net 30
Due date:: Dec 2, 2026
Billing period:: Oct 1-31, 2026

Bill to (client)

Company:: Example Manufacturing Inc.
Attention:: Jamie Example, COO
Address:: 400 Sample Way, Sampletown
Email:: [Email]

Engagement

Engagement:: Operations review and process redesign
Statement of work:: SOW-07
Lead consultant:: [Consultant name]

Milestones

Item: Milestone 1: current-state assessmentAmount: 4,500.00
Details:
Delivered Oct 9, 2026
Qty:
1
Unit:
milestone
Rate:
4,500.00
Item: Milestone 2: process redesign workshop, 2 daysAmount: 3,800.00
Details:
Delivered Oct 22, 2026
Qty:
1
Unit:
milestone
Rate:
3,800.00

Milestones: line items
Item	Details	Qty	Unit	Rate	Amount
Milestone 1: current-state assessment	Delivered Oct 9, 2026	1	milestone	4,500.00	4,500.00
Milestone 2: process redesign workshop, 2 days	Delivered Oct 22, 2026	1	milestone	3,800.00	3,800.00

Milestones subtotal8,300.00

Advisory hours

Item: Implementation advisory callsAmount: 1,462.50
Details:
Oct 26-30, 2026
Qty:
6.5
Unit:
hour
Rate:
225.00

Advisory hours: line items
Item	Details	Qty	Unit	Rate	Amount
Implementation advisory calls	Oct 26-30, 2026	6.5	hour	225.00	1,462.50

Advisory hours subtotal1,462.50

Expenses, at cost

Item: Round-trip airfare for the workshopAmount: 428.60
Details:
Copy attached
Qty:
1
Unit:
trip
Rate:
428.60
Item: HotelAmount: 378.00
Details:
Oct 21-23, 2026
Qty:
2
Unit:
night
Rate:
189.00

Expenses, at cost: line items
Item	Details	Qty	Unit	Rate	Amount
Round-trip airfare for the workshop	Copy attached	1	trip	428.60	428.60
Hotel	Oct 21-23, 2026	2	night	189.00	378.00

Subtotal: 9,762.50
Sales tax on fees, if applicable (0%): 0.00
Expenses, at cost: 806.60
Total: 10,569.10
Less: retainer applied: 2,500.00
Amount due: 8,069.10

How to pay

Accepted methods:: Bank transfer, ACH or check
Account name:: [Account name]
Bank details:: [Bank name, account and routing numbers]
Payment reference:: Invoice CS-1207, SOW-07

Billing notes

Milestones are billed at the fixed fees in SOW-07 once delivered.
Expenses are billed at cost, without markup, and are not part of the subtotal; copies are attached.
Retainer: 2,500.00 received on Sep 25, 2026, and applied in full to this invoice.

Please quote the invoice number with your payment.

Consulting services invoice: sample preview. Download it below.

Key Features

Everything you need in a professional invoice template.

Invoice details with payment terms, due date and billing period

"Bill to (client)" with company and attention, plus an engagement block: engagement, statement of work and lead consultant

Milestones table for fixed fees, with delivery dates and a milestones subtotal

Advisory hours table: dates, hours × rate and an advisory hours subtotal

Expenses at cost, kept out of the taxed subtotal

Sales tax rate cell starting at 0%, "Less: retainer applied" and the amount due

Blank PDF, plus Word and Excel files with a sample engagement; the Excel file calculates every amount and total

Download the invoice template

The PDF is a blank invoice to print and fill in by hand. The Word and Excel files contain the sample details shown in the preview, ready for you to replace with your own. In the Excel file, each line amount is a formula: "Qty" × "Rate". The section subtotals, subtotal, tax, pass-through costs, total and amount due are formulas too. The amount due is the total minus the retainer applied. The tax rate sits in its own cell, so you can change it.

CONSULTING INVOICE

Consultant

Business name:: Example Advisory LLC
Address:: 80 Example Street, Floor 4, Sampletown
Phone / email:: [Phone or email]

Invoice details

Invoice no.:: CS-1207
Invoice date:: Nov 2, 2026
Payment terms:: Net 30
Due date:: Dec 2, 2026
Billing period:: Oct 1-31, 2026

Bill to (client)

Company:: Example Manufacturing Inc.
Attention:: Jamie Example, COO
Address:: 400 Sample Way, Sampletown
Email:: [Email]

Engagement

Engagement:: Operations review and process redesign
Statement of work:: SOW-07
Lead consultant:: [Consultant name]

Milestones

Item: Milestone 1: current-state assessmentAmount: 4,500.00
Details:
Delivered Oct 9, 2026
Qty:
1
Unit:
milestone
Rate:
4,500.00
Item: Milestone 2: process redesign workshop, 2 daysAmount: 3,800.00
Details:
Delivered Oct 22, 2026
Qty:
1
Unit:
milestone
Rate:
3,800.00

Milestones: line items
Item	Details	Qty	Unit	Rate	Amount
Milestone 1: current-state assessment	Delivered Oct 9, 2026	1	milestone	4,500.00	4,500.00
Milestone 2: process redesign workshop, 2 days	Delivered Oct 22, 2026	1	milestone	3,800.00	3,800.00

Milestones subtotal8,300.00

Advisory hours

Item: Implementation advisory callsAmount: 1,462.50
Details:
Oct 26-30, 2026
Qty:
6.5
Unit:
hour
Rate:
225.00

Advisory hours: line items
Item	Details	Qty	Unit	Rate	Amount
Implementation advisory calls	Oct 26-30, 2026	6.5	hour	225.00	1,462.50

Advisory hours subtotal1,462.50

Expenses, at cost

Item: Round-trip airfare for the workshopAmount: 428.60
Details:
Copy attached
Qty:
1
Unit:
trip
Rate:
428.60
Item: HotelAmount: 378.00
Details:
Oct 21-23, 2026
Qty:
2
Unit:
night
Rate:
189.00

Expenses, at cost: line items
Item	Details	Qty	Unit	Rate	Amount
Round-trip airfare for the workshop	Copy attached	1	trip	428.60	428.60
Hotel	Oct 21-23, 2026	2	night	189.00	378.00

Subtotal: 9,762.50
Sales tax on fees, if applicable (0%): 0.00
Expenses, at cost: 806.60
Total: 10,569.10
Less: retainer applied: 2,500.00
Amount due: 8,069.10

How to pay

Accepted methods:: Bank transfer, ACH or check
Account name:: [Account name]
Bank details:: [Bank name, account and routing numbers]
Payment reference:: Invoice CS-1207, SOW-07

Billing notes

Milestones are billed at the fixed fees in SOW-07 once delivered.
Expenses are billed at cost, without markup, and are not part of the subtotal; copies are attached.
Retainer: 2,500.00 received on Sep 25, 2026, and applied in full to this invoice.

Please quote the invoice number with your payment.

Consulting services invoice

An invoice for a consulting engagement: fixed-fee milestones delivered, advisory hours at an hourly rate, expenses billed at cost, a tax rate cell on fees, the retainer applied and the amount due.

A request for payment — shows the amount due

Download

What a consulting invoice is for

A consulting invoice bills a client for work delivered under an engagement. It names the engagement and its statement of work, then lists:

your fees on the basis you agreed: fixed-fee milestones, hours, or both;
any expenses you paid on the client's behalf, at cost;
any retainer the client paid in advance, taken off the total.

It ends with the amount due and a due date.

The template suits independent and business consultants alike: strategy sessions, market analysis, operational reviews, workshops and similar advisory work. For specialist consulting with its own layout, see the related templates below.

What's on the consulting invoice

Consultant: business name, address, and phone or email
Invoice details: invoice number, invoice date, payment terms, due date and billing period
Bill to (client): company, attention, address and email
Engagement: the engagement name, the statement of work it falls under, and the lead consultant
Milestones: each fixed-fee milestone with the date it was delivered, quantity, unit, rate and amount, and a milestones subtotal
Advisory hours: hourly work with its dates, hours × rate, and an advisory hours subtotal
Expenses, at cost: each expense with its details, quantity × cost
Totals:
- "Subtotal" and "Sales tax on fees, if applicable";
- "Expenses, at cost";
- "Total";
- "Less: retainer applied";
- "Amount due".
How to pay: accepted methods, account name, bank details and a payment reference, with placeholders for your own details
Billing notes: how milestones, expenses and the retainer are billed

The sample bills a manufacturer for October's work on an operations review under SOW-07:

Milestones: two, a current-state assessment (4,500.00) and a two-day process redesign workshop (3,800.00).
Advisory hours: 6.5 hours of implementation advisory calls at 225.00 (1,462.50).
Expenses: airfare and two hotel nights for the workshop, at cost (806.60).

That's a total of 10,569.10. Less the 2,500.00 retainer, the amount due is 8,069.10 on Net 30 terms.

Hourly, milestone or retainer billing

Use the basis in your engagement letter or statement of work, and make the invoice show it plainly. The template has a table for each of the first two.

Milestones or fixed fees. Bill one row per milestone or deliverable at the agreed fee, once it's delivered, with the delivery date in the details. The sample note in the Word and Excel files says: "Milestones are billed at the fixed fees in SOW-07 once delivered."
Hourly. Bill one row per piece of work or per period, such as "Implementation advisory calls, Oct 26-30, 2026", with the hours and your rate. Bill in the time increments your agreement states. Keep your time records so you can answer a query; send a detailed time log too if the client asks for one.
Retainer. Two different arrangements go by this name, and they go on the invoice differently:
- A retainer paid in advance, held against future work, is a credit. It comes off the total on "Less: retainer applied", and the amount due is what's left. That's what the sample shows.
- A monthly retainer fee for agreed availability or a set number of hours is a fee. Bill it as a row in its own right, for example in the milestones table with the month in the details. Bill any hours over the allowance in the advisory hours table at the agreed rate.

An engagement can mix bases, as the sample does: fixed fees for the assessment and workshop, then hourly follow-up. Keep each on its own row so the client can match it to the statement of work.

Expenses at cost

Bill expenses the client agreed to cover in the expenses table, at what you paid. That might be travel, lodging, research data or a workshop venue. The sample bills a round-trip flight (428.60) and two hotel nights at 189.00, both for the workshop.

Expenses sit below the sales tax line in the totals, so they aren't taxed as your fees. The sample note in the Word and Excel files says they "are billed at cost, without markup, and are not part of the subtotal; copies are attached". Keep the receipts, and attach copies if the client's expense policy or your agreement asks for them. If you charge a markup or an admin fee on expenses, agree it in writing first and bill it as its own row.

Retainer applied

If the client paid a retainer when the engagement started, enter what you're applying to this invoice on "Less: retainer applied". Say in the billing notes when it was received and how much of it is left. The sample note in the Word and Excel files says: "2,500.00 received on Sep 25, 2026, and applied in full to this invoice." If you apply only part of a retainer, say how much remains for later invoices.

Payment terms

Agree payment terms in the engagement letter, then print them with the invoice date and due date on every invoice. The sample uses Net 30: October's work is invoiced on Nov 2 and due on Dec 2. The payment reference asks the client to quote the invoice number and the statement of work, so you can match the payment.

For a new client or a long engagement, an advance retainer or milestone billing means you aren't carrying months of unbilled work. If you want to charge a late fee or interest, agree it in writing first and check the rules where you work before you charge it.

Sales tax

Whether consulting fees are taxable depends on where you do business and what the service is. Check with the tax agency where you work. The "Sales tax on fees, if applicable" line has a rate cell that starts at 0%.

How to fill in the template

Add your business details, then the invoice number, invoice date, payment terms, due date and billing period.
Under "Bill to (client)", enter the company and the person the invoice is for. Under "Engagement", add the engagement name, the statement of work and the lead consultant.
Enter each milestone delivered in the period, with its delivery date and agreed fee.
Enter hourly work in the advisory hours table, with dates, hours and your rate.
Add expenses at cost, with enough detail for the client to match them to the receipts.
Set the sales tax rate (or leave it at 0%), and enter the retainer you're applying.
Edit the billing notes to match your agreement, replace the placeholders in "How to pay" with your own details, and send the invoice.

The PDF is a blank form for filling in by hand. The Word and Excel files have the same layout with the sample engagement filled in, for you to overwrite.

In the Excel file, each line amount is quantity × rate. The table subtotals, the subtotal, the sales tax, the expenses total, the total and the amount due are formulas too. The sales tax rate has its own cell and applies to the subtotal of fees only, so expenses aren't taxed. Set the rate to 0% to leave sales tax out, and set "Less: retainer applied" to 0.00 if there's no retainer. Don't delete either row, because the totals refer to them. The milestones table has three rows, the advisory hours table two and the expenses table three. For more lines, insert rows inside a table and copy the amount formula into them so the totals include them. In Word or on the PDF, work out the amounts yourself.

For a general layout, see the invoice templates for Word, for Excel, as a PDF, for Google Docs and for Google Sheets.

Consulting invoices in Billed

If you invoice in Billed, you can:

track time against tasks and projects and, in an hourly rate project, invoice one task or several at once from the project dashboard;
record expenses with the receipt attached, then add the agreed costs to the client's invoice as line items;
let clients pay online by card or PayPal;
send automatic reminders for overdue invoices.

For a retainer fee billed for the same amount every month, Billed's recurring invoices send it on schedule.

Related templates

SEO consultant invoice for monthly SEO retainers
IT consulting invoice for technology consulting
Career consultant invoice for career coaching and advice
Lawyer invoice for time entries, costs advanced and a retainer in a legal matter
Hourly invoice for billing time alone
All invoice templates

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What's included in this invoice template

Basis	On the invoice	Calculation
Fixed-fee milestone	Milestones table	Agreed fee, once delivered
Hourly work	Advisory hours table	Hours × rate
Monthly retainer fee	A row of its own, e.g. in the milestones table	Agreed monthly fee
Retainer paid in advance	"Less: retainer applied"	Comes off the total
Expenses	Expenses table, below the sales tax line	At cost

When this isn't for you

If you bill the same retainer every month with a fixed list of deliverables, the SEO consultant invoice is built around that. If you need a priced proposal before the work starts, send an estimate or a statement of work first; this template bills work already delivered.