How to Invoice for Hourly Work
Many freelancers, contractors, consultants, tutors, and service businesses charge customers based on the number of hours worked. Creating a clear hourly invoice helps customers understand exactly what work was completed, how long it took, and how the final amount was calculated. A well organised invoice also creates accurate business records and reduces the chance of payment disputes.
This guide is part of our Invoice Descriptions and Line Items Guide hub.
What is an hourly invoice?
An hourly invoice is an invoice that charges the customer according to the amount of time spent completing work. Instead of charging one fixed project price, the business records the number of billable hours and multiplies them by an agreed hourly rate.
Hourly invoices are commonly used when the total amount of work cannot be predicted before a project begins or when customers request services as they are needed.
Who uses hourly invoices?
Charging by the hour is common across many industries where the amount of work can vary between projects.
Businesses and professionals that often use hourly invoices include:
- Freelancers
- Consultants
- Tutors
- Graphic designers
- Web developers
- Electricians
- Plumbers
- Mechanics
- Solicitors
- Accountants
What should an hourly invoice include?
A professional hourly invoice should include all of the standard invoice information as well as a clear breakdown of the hours worked.
Each invoice should normally include:
- Business details
- Customer details
- Invoice number
- Invoice date
- Payment due date
- Description of the work completed
- Number of hours worked
- Hourly rate
- Line total
- Tax where applicable
- Final balance due
Record billable hours accurately
Before creating the invoice, make sure the number of billable hours has been recorded accurately. Many businesses keep timesheets, calendars, or project management records throughout the project.
Accurate time records help prevent mistakes and provide useful evidence if a customer asks how the invoice was calculated.
Describe the work completed
Each hourly charge should include a clear description of the work completed. Instead of writing consulting services, explain the task more specifically.
For example, a web developer could write website maintenance and security updates completed during July 2026. A tutor could write three mathematics tutoring sessions completed between 10 and 17 July 2026.
Clear descriptions help customers recognise the work immediately.
Show the hourly rate clearly
The invoice should make it easy for the customer to understand how the total was calculated. Show the number of hours worked, the hourly rate, and the line total for each service.
For example, eight hours at £45 per hour produces a total of £360. Presenting the calculation clearly reduces confusion and makes the invoice easier to review.
Use separate line items for different tasks
Some projects involve several different types of work. If different tasks have different hourly rates, each task should appear on its own invoice line.
For example, a consultant may charge one rate for planning meetings and another rate for implementation work. Separating the charges makes the invoice more transparent and easier for the customer to understand.
Can you invoice part of an hour?
Yes. Many businesses charge for part hours when the work does not finish exactly on the hour. Some round to the nearest fifteen minutes while others bill in smaller increments according to their agreed terms.
Whichever approach is used, it should remain consistent and should ideally be agreed before work begins.
Include project references where appropriate
For larger projects, adding a project name, purchase order number, or job reference can make the invoice easier for the customer to process.
This is especially useful when invoicing larger organisations that manage several projects with the same supplier.
Add expenses separately
If the customer has agreed to reimburse travel, materials, accommodation, or other expenses, these should normally appear as separate invoice line items rather than being included within the hourly rate.
Keeping expenses separate makes the invoice clearer and allows customers to review each charge individually.
Review the invoice before sending
Before sending the invoice, check that the recorded hours match your own records and that the hourly rate is correct. Review descriptions, taxes, discounts, deposits, and totals carefully.
It is also worth checking that every completed task has been included and that no work has been charged twice.
Why clear hourly invoices matter
Customers are more likely to approve invoices quickly when they can see exactly how the final amount has been calculated. Clear hourly invoices build trust and reduce unnecessary questions.
Accurate invoices also create better bookkeeping records and make it easier to review completed projects in the future.
Create professional hourly invoices
A professional hourly invoice should clearly explain the work completed, the number of hours worked, the hourly rate, and the final amount due.
Using detailed descriptions, accurate time records, and organised line items helps businesses create invoices that are easy to understand and simple for customers to approve and pay.
Frequently asked questions
How do you invoice hourly work?
Record the number of billable hours, multiply them by the agreed hourly rate, and clearly show the calculation on the invoice along with a description of the work completed.
What should an hourly invoice include?
An hourly invoice should include business details, customer details, invoice number, invoice date, payment due date, descriptions of the work completed, billable hours, hourly rate, taxes where applicable, and the final balance due.
Can I charge for part of an hour?
Yes. Many businesses charge for partial hours using consistent billing increments that have been agreed with the customer.
Should different hourly rates be shown separately?
Yes. If different tasks have different hourly rates, each task should appear as its own invoice line item to make the invoice easier to understand.
Should expenses be included in the hourly rate?
If expenses are reimbursed separately, they should normally appear as individual invoice line items rather than being included within the hourly labour charge.
Why are hourly invoices useful?
Hourly invoices provide a clear breakdown of the time worked and help customers understand how the final amount was calculated, reducing confusion and payment disputes.
Create a professional hourly invoice
Use InvoiceAtlas to add billable hours, hourly rates, taxes, discounts, payment terms, and detailed line items before downloading your professional invoice as a PDF.
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