How to Add Expenses to an Invoice

How do you add expenses to an invoice?

Expenses can be added to an invoice as separate items alongside the main products or services. Each expense should include a clear description and the amount being charged to the customer.

Keeping expenses separate from labour or service fees makes the invoice easier to understand. Customers can see the cost of the work and any additional expenses without having to calculate the difference themselves.

Before adding an expense, confirm that the customer agreed to cover the cost. Expenses that were not discussed in advance may lead to questions or payment disputes.

What are reimbursable expenses?

Reimbursable expenses are costs paid by a business, freelancer, or contractor while completing work for a customer. The customer later repays these costs through an invoice.

For example, a consultant may pay for travel to attend a customer meeting. A photographer may pay an agreed location fee. A contractor may purchase materials required for a specific project.

The expense is connected to the customer work rather than being a general cost of operating the business. Clear records can help explain why the expense was included on the invoice.

Common expenses added to invoices

The expenses included on an invoice depend on the type of business and the work being completed. Common examples include:

• Travel costs
• Mileage expenses
• Accommodation costs
• Materials and supplies
• Equipment hire
• Postage and delivery
• Parking charges
• Location fees
• Printing costs
• Customer approved purchases
• Project related software
• Additional third party services

How to describe expenses on an invoice

Every expense should use a description that allows the customer to understand what the cost relates to. Avoid vague descriptions such as extra expense, additional cost, or project fee.

For example, a consultant could use the description travel expenses for customer site visit. A contractor could write materials purchased for kitchen installation. These descriptions provide more information than a general expense label.

If several expenses relate to the same project, they can be listed separately or grouped when the combined description remains clear.

Should expenses be listed separately?

Listing expenses separately from the main service charge often makes an invoice easier to review. The customer can see the value of the work and the additional costs connected to completing it.

For example, a photographer may list photography services as one invoice item and location hire as another. A contractor may separate labour charges from materials and equipment costs.

Separate expense items can also make it easier to compare the final invoice with an earlier quote, estimate, or customer agreement.

How to invoice travel expenses

Travel expenses may include public transport, flights, accommodation, parking, or other agreed costs required to complete customer work.

The invoice should explain the purpose of the travel and show the amount being charged. For example, the description could state train travel for customer meeting or accommodation for project site visit.

Customers should normally be informed about significant travel costs before they are incurred. Agreeing these expenses in advance can reduce unexpected charges.

How to add mileage expenses to an invoice

Businesses and self employed professionals may charge mileage when travelling to customer locations or project sites. The invoice should explain the journey or work connected to the mileage charge.

A mileage expense may be calculated using an agreed rate and the distance travelled. For example, the invoice description could show the number of miles, the rate used, and the total mileage cost.

The amount charged to a customer may not always be the same as an amount used for tax or accounting purposes. Businesses should keep clear records and check any relevant requirements.

How to add materials to an invoice

Materials purchased for a customer project can be listed as separate invoice items. The description should identify the materials and explain how they relate to the completed work.

For example, a decorator may include paint and decorating supplies, while a carpenter may include timber, fittings, and installation materials.

Businesses should avoid charging for the same materials twice. Review any deposit, quote, or earlier payment to confirm whether material costs have already been included.

Should you provide receipts for invoice expenses?

Customers may request receipts or supporting information for reimbursable expenses, particularly when the costs are significant or were charged at their original value.

Keeping receipts can help confirm the amount paid and explain why the expense was required. The business can provide copies when this was agreed or when additional evidence is needed.

Receipts should be stored with the related project and invoice records so they can be found easily if a customer asks about a charge.

Should expenses include a markup?

Some businesses charge expenses at their original cost, while others may include an agreed markup for purchasing, arranging, handling, or managing materials and services.

Any markup should be communicated clearly and remain consistent with the customer agreement. Adding an unexpected increase after the expense has already been incurred may lead to confusion.

Businesses can show the expense and related service charge separately when this makes the pricing easier for the customer to understand.

How expenses affect the invoice total

Expenses increase the amount charged on an invoice and should be included when calculating the final balance. The invoice should show the service costs, expenses, discounts, additional charges, applicable taxes, and final amount due.

For example, a consultant may charge £700 for professional services and include £80 in agreed travel expenses. Before any applicable tax or discount, the invoice amount would be £780.

Displaying the service and travel costs separately provides a clearer explanation of the final total.

Common mistakes when invoicing expenses

Review every expense before sending the invoice to make sure the descriptions and amounts are accurate. Common mistakes include:

• Adding expenses that were not agreed
• Using unclear expense descriptions
• Charging the same expense twice
• Including incorrect receipt amounts
• Forgetting an approved customer expense
• Combining unrelated costs without explanation
• Adding an unexpected markup
• Using the wrong mileage calculation
• Including expenses already covered by a deposit
• Calculating the final balance incorrectly

Create an invoice with clear expenses

A professional invoice should make expenses easy to identify and understand. Clear descriptions help customers see why each cost was required and how it contributed to the final balance.

Before sending an invoice, review every expense, confirm that the amounts are correct, and check that agreed costs have not been included more than once.

InvoiceAtlas allows you to add separate invoice items for services, materials, travel, and other customer expenses before downloading the completed invoice as a professional PDF.