Billable Expense

Billable Expense Definition

A billable expense is a cost your business incurs on behalf of a client that you plan to pass along to them — essentially, you pay for something now and invoice the client for it later. Common examples include travel costs, materials, subcontractor fees, and shipping. It's an expense for you temporarily, but it becomes revenue when you bill the client.

Billable Expense in Practice — Example

You're an architect working on a residential project. You spend $800 on soil testing and $200 on permit fees — both are project costs your contract says the client covers. You record each as a billable expense in QuickBooks, tagging them to the client's project. At the end of the month, you create an invoice that includes your design fees plus the $1,000 in billable expenses. The client pays one invoice covering everything, and those expenses are no longer a cost you absorb.

Why Billable Expense Matters for Your Books

Without tracking billable expenses properly, you either eat costs that should be reimbursed (hurting your margins) or forget to bill clients entirely. For service businesses that regularly incur costs on behalf of clients, this can add up to thousands in lost revenue per year.

Proper billable expense tracking also gives you accurate project profitability. When you can see exactly what you spent on behalf of each client versus what you billed them, you know your true margin per project — not just your labor margin.

It also affects your taxes. A billable expense is temporarily your cost, but once invoiced and paid, it becomes pass-through revenue. Tracking the flow correctly ensures your P&L reflects reality and you're not overstating expenses or understating revenue.

How Billable Expense Shows Up in QuickBooks

In QBO, mark expenses as billable when entering them. Go to Expenses → New Expense, enter the details, and check the "Billable" checkbox. Assign it to the customer/project. When you create an invoice for that customer, QBO prompts you to add outstanding billable expenses. You can mark them up if your contract allows. Track unbilled expenses under Reports → Unbilled Charges to make sure nothing slips through the cracks.

Common Mistakes

Forgetting to mark expenses as billable. If you don't check the box when entering the expense, it won't appear when you create the client's invoice. Review unbilled charges regularly.

Not invoicing billable expenses promptly. The longer you wait, the harder it is to justify costs to the client. Bill monthly or at project milestones.

Absorbing expenses that should be billed. If your contract says the client pays for materials/travel, track and bill them. Being "nice" about it erodes your margins over time.

FAQ

Q: Should I mark up billable expenses? A: It depends on your contract and industry norms. Many businesses add a 10-15% markup on billable expenses to cover the administrative cost of managing them. Be transparent with clients about your policy.

Q: Are billable expenses revenue or cost? A: Both — temporarily. When you incur the cost, it's an expense. When you invoice the client, it becomes revenue. The net effect on your P&L is zero (or positive if you mark up).

Related Terms

Accounts Receivable

Direct Cost

Cost Allocation

Bill Payment

Earned Revenue

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