What is the difference between hourly and project-based invoicing?

Hourly invoicing charges based on time spent: hours × rate. Project-based invoicing charges a fixed amount for completing a specific project, regardless of hours. Choose based on your service model and client agreement.

Free Service Invoice Generator Online — For Consultants & Agencies

Q: What is a service invoice?

A service invoice is a bill issued by a service provider (consultant, agency, freelancer) to a client for work performed. It typically includes hourly rates, project fees, or flat-rate charges for professional services.

Q: What should a service invoice include?

A professional service invoice should include: service provider details, client information, invoice number and date, detailed service descriptions, hours worked (if hourly), rate per hour/service, total amount, payment terms, due date, and any taxes or fees.

Q: How do I calculate hourly service rates?

Hourly rate = Total cost per hour (expenses + profit margin). For consultants, typical rates range from $50-500+ per hour depending on expertise, location, and industry. Multiply hours worked by your hourly rate to get the service cost.

Q: Can I use this for retainer agreements?

Yes! Use the flat-rate or project-based option to create monthly retainer invoices. Simply enter the agreed-upon retainer amount as a single line item.

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Service Provider Info

Business / Your Name *

Address

Phone

Tax ID / VAT / ABN (optional)

Bill To (Client)

Client Name / Company *

Client Email

Client Address

Contact Person (optional)

Invoice Details

Invoice #

Issue Date

Due Date

Currency

Billing Type

Project / Engagement Name (optional)

Payment Terms

Services Rendered

Description	Hrs / Qty	Rate	Amount	Tax %

Subtotal$0.00

Discount

Expenses

Total Due$0.00

Signature Block

Show authorized signature line on invoice

Notes & Payment Info

Bank Account Details (optional)

Notes / Payment Instructions

Free Service Invoice Generator — For Consultants, Agencies & Freelancers

Toolbox Service Invoice Generator is completely free — no login, no account, no watermark on the PDF. Support hourly billing, project-based fees, retainers, and flat rates. Add multiple service line items with individual tax rates, track expenses, apply discounts, and record advance deposits. Download a professional service invoice as PDF in under 3 minutes.

What Should a Service Invoice Include?

A professional service invoice must include: your business name and contact details, client name and billing address, a unique invoice number, issue date and due date, the billing type (hourly/project/retainer), an itemized list of services with hours or quantities and rates, applicable taxes, any discounts or expenses, and the total amount due with payment instructions.

Frequently Asked Questions

What is a service invoice?

A service invoice is a bill issued by a service provider — consultant, agency, or freelancer — to a client for work performed. It typically includes hourly rates, project fees, or flat-rate charges for professional services rendered.

What should a service invoice include?

Provider and client details, a unique invoice number, issue and due dates, billing type, itemized services with hours/quantities and rates, applicable taxes, any discounts or deposits, the total due, and your payment instructions or bank details.

How do I calculate hourly service rates?

Typical consultant rates range from $50–500+/hr depending on expertise and market. Enter your rate and hours per line item — amounts calculate automatically. Use separate line items for services with different rates.

Can I use this for retainer agreements?

Yes. Select "Retainer" as your billing type and add a single line item with your agreed monthly amount (quantity: 1). This clearly communicates the retainer nature of the invoice to your client.

How do I handle multiple services with different rates?

Add a separate line item for each service. For example: "Strategy Consulting: 10 hrs @ $200/hr" and "Implementation: 20 hrs @ $100/hr". Each calculates separately with its own tax rate.

Can I save invoices to edit later?

Invoice data is processed entirely in your browser — nothing is sent to any server. Click Preview & Print, then Save as PDF in the browser dialog to download. Refresh the page to start a new invoice.

Service Invoice Preview

Free Service Invoice Generator — For Consultants, Agencies & Freelancers

What Should a Service Invoice Include?

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Frequently Asked Questions