Your ultimate guide to billable expenses

What is a billable expense

A billable expense is a project-specific cost your company pays upfront, then charges back to the client. It is a cost you take on for a customer while doing work for them.

The test is whether the cost exists because the client exists. For example, a flight to a client site wouldn't have happened without the engagement, so it's recoverable. Your office rent happens whether that client signs or not, so it isn't.

Two things have to be true before you can invoice it. The contract has to permit the category, and you have to be able to prove the cost. Miss either and the line gets disputed.

Billable expenses turn up across consulting, legal services, marketing agencies, architecture, construction, and IT services, and in any business that runs project work for named clients.

Billable, billed, and billable amount: what each term means

These get used interchangeably and they describe different things.

Billable means a cost or hour can be charged to a client under the agreement. If you're marking a line on an expense report as billable or non-billable, that's the question you're answering.

Billed means the cost has already gone onto an invoice.

Billing is the process of raising and issuing that invoice.

Billable amount is the figure that lands on the invoice line. Where the contract says billed at cost, the amount follows the contract's definition of cost, which decides how taxes, FX, and transaction fees are treated. Where the contract permits a markup, it's higher.

Hire an external consultant for Client A's project and the fee is billable the moment it meets the contract terms. It becomes billed when it reaches the invoice. Everything between those two moments is where money gets lost.

You'll also see the same thing called on-charging, recharging, re-billing, disbursements, or pass-on costs. Xero lists all of those as alternative names for billable expenses. The accounting doesn't change with the label.

How a billable expense works, step by step

The billable expense workflow has four stages, each with its own failure point.

1. Incur the cost. You pay for something tied directly to a client project
2. Tag it. Code it to the client, the project, and the expense category at the point of purchase. Miscoding here is one common cause of recoverable costs being missed at billing
3. Invoice it. Add the line to the client's next invoice with documentation attached
4. Account for the recovery. Recognize the receivable when you invoice, keep it separate from service revenue, and clear it when the payment lands

Delay at any stage costs you. An expense coded two weeks late is more likely to be coded wrong, and an invoice without documentation invites a dispute.

What is billable expense income

Billable expense income is the amount you charge a client to recover a cost you paid on their behalf. It sits on the revenue side of your books and it isn't earnings, because a matching cost sits on the other side. In QuickBooks, the reimbursement posts to a billable expense income account when you add the tagged cost to the customer's invoice.

For example, if you pay a specialist contractor USD $4,000 for a client engagement, invoice the same USD $4,000, and the payment you collect is billable expense income. Your margin doesn't change unless you added a markup. The account label sits on the revenue side, and that alone doesn't make the amount profit.

The founder-level consequence is investor optics. USD $200,000 of service revenue plus USD $80,000 of recovered client costs reads as USD $280,000 if nobody separates them. Gross presentation may well be correct, and USD $280,000 still isn't the number a board is asking about when it asks how much you sold. Split the two in management reporting and the service economics stay visible whichever way the statutory accounts present them.

Billable expense income vs sales of product income

Billable expense income and sales of product income both touch the revenue line, and they mean opposite things. This is the distinction that decides whether your billable revenue is telling the truth.

Combine pass-through recoveries with core service revenue and your margin percentage falls, because the denominator grew and the numerator didn't. The statutory presentation can be perfectly correct and the KPI still misleading.

Billable vs reimbursable expenses

Different relationships, and the terms drift by system. In this article, reimbursable means an employee or contractor cost your company pays back, and billable means a client cost your company charges onward.

Reimbursable describes employee to company. Your designer buys a stock photo license on a personal card and you pay her back. Billable describes company to client. You then bill the client for that same license.

One cost can be both. She gets reimbursed, the client gets billed, and if your system tracks only one leg you'll pay her and forget to charge them.

Billable vs non-billable expenses

Cash leaves your account the same way either time. What changes is whether it comes back.

The financial difference runs four ways.

Margin. A cost recovered at cost usually leaves your margin where it was. An absorbed one reduces it, immediately and permanently.

Cash flow. Billable costs create a gap between paying and being repaid. Non-billable costs create no gap, because nothing comes back.

Reporting. Recovered amounts can appear as revenue depending on which method you use. Absorbed costs never produce a matching inflow.

Tax. Deductibility depends on what the cost actually is, not on whether you marked it billable. The difference is that a billable cost also produces income to report when you invoice the recovery.

Some costs sit in between. A laptop bought mainly for one client but also used internally is a contract question before it's an accounting one, so agree the split in writing before it reaches an invoice.

Examples of billable expenses

What counts as a billable expense varies by industry, and the categories are predictable once you know where to look. Everything below is billable only where the cost was incurred for that specific engagement and the client agreement permits the category.

Travel and accommodation

Flights, hotels, rental cars, and ground transport tied to a specific engagement. Mileage is billable too. The IRS standard business mileage rate is 76 cents per mile from Jul 1 to Dec 31, 2026, though that's a tax figure. Whether you bill at that rate, at actual cost, or at another agreed number is a contract question.

Lodging carries a documentation rule of its own, covered below. Personal costs on a client trip stay yours.

Subcontractor and consultant fees

Freelancers, contractors, and specialists brought in for one project. An agency hiring a videographer, a firm bringing in an expert witness, a studio contracting a developer.

Whether you itemize these or fold them into a project fee depends on the agreement, so track them the way the contract treats them. And if you're paying a US contractor USD $2,000 or more in 2026 and rebilling their work, Form 1099-NEC is in play at year end.

That threshold rose from USD $600 under the One Big Beautiful Bill Act for payments made after Dec 31, 2025, and it's indexed for inflation from 2027.

Client materials and supplies

Anything bought exclusively for a client deliverable: printed reports, components, samples, equipment.

The moment materials serve two clients you need an allocation rule. Splitting a bulk order by memory in month three doesn't work, and the usual outcome is that one client gets billed for all of it or neither does.

Software and licenses

Temporary licenses, stock assets, premium research tools, and ad platform spend bought for one engagement.

Company-wide subscriptions stay non-billable even when a client benefits from them. The test is whether you'd cancel it when the project ends.

Shipping and delivery

Couriering prototypes, documents, or samples to a client. Individually small, and across a year of deliverables it's a real number that routinely goes unbilled because nobody thinks to code a USD $18 courier slip to a project.

Payment processing fees

If you buy client materials through a vendor that charges a processing fee, the fee is part of what you spent. Founders commonly book only the net amount received or paid and absorb the difference without noticing.

Permits and regulatory charges

Licensing fees, permits, and compliance costs required to complete the agreed scope. Common in construction, events, and anything requiring a filing.

When to charge a client for a billable expense

You can't bill a client for expenses after the fact without an agreement. Five rules for billable expenses, set before work starts.

Name the categories in the contract. Travel, subcontractors, tools, expedited shipping. Vague terms are what invoices get disputed over, and the version to watch for is a team assuming travel is covered when the agreement never says so.

State the markup, or state that there isn't one. Billed at cost means the documented invoice amount. If you intend to add a handling percentage, it goes in writing before the first receipt.

Respect approval thresholds and caps. Many agreements require written pre-approval above a limit, or exclude categories outright. Tracking against the cap is your job, not the client's.

Itemize every line. Date, description, amount, and the receipt attached. Clients shouldn't have to guess what they're paying for, and an itemized invoice gets paid faster than a lump sum labeled "expenses."

Bill in the cycle the cost lands. Incur USD $20,000 in January and invoice in March and you've financed your client for two months at your own cost. Across several projects that gap becomes a cash flow problem you created.

How to record a billable expense

This is the part most guides skip, and it decides whether your P&L tells the truth.

The two journal entries

One transaction, three moments. This is an illustrative gross-presentation example, and your accounts and timing will depend on your accounting method, the contract, and the principal-versus-agent analysis below.

Spend USD $1,000 on client materials and invoice USD $1,000. The first entry records the outflow, the second recognizes the recovery, and the third just clears the receivable. Billed at cost, the profit effect is nil.

Gross method vs net method

Gross and net are different presentations of the same economics, and you don't get to pick whichever makes the income statement look better.

Present gross and the cost sits as an expense while the recovery sits as revenue. Both appear, both offset, and your income statement shows the full volume of client cash you're fronting. Present net and the recovery is set against the cost instead, so neither the expense nor the revenue reaches those lines and the pass-through volume becomes invisible.

Which applies is an accounting judgment. Where another party supplies a good or service to your client, ASC 606's principal-and-agent framework governs, and it turns on control before transfer rather than on whether you added a markup. A principal recognizes the gross amount; an agent recognizes the fee it keeps.

Reimbursed costs you incur to deliver your own service are a separate question. Deloitte's guidance notes that out-of-pocket costs incurred to fulfil your own service can still be presented gross even though they aren't a distinct good or service to the client. It's a conversation for your accountant, not a setting in your books.

How billable expense income appears on your income statement

Where gross presentation is appropriate, the recovery goes into revenue and the matching cost sits separately in cost of sales or operating expenses. Both appear, both offset.

For management reporting, most businesses track client-cost recoveries in their own income account so service revenue and pass-through activity can be read apart. That split doesn't change total GAAP revenue when gross presentation is required. It changes what the mix tells you, and gross margin percentage is the number that moves once recoveries and service work are pooled into one line.

If a board or a lender is reading it, the merged version is the one they'll take at face value.

How to set up billable expenses in QuickBooks

QuickBooks Online Plus and Advanced handle this natively, and it's switched off by default. This is a QuickBooks workflow, not a universal accounting rule. Your accountant should determine which income/expense accounts and presentation are appropriate for your business.

Turn on billable expense tracking

Go to Settings, then Account and settings, then the Expenses tab. Under Bills and expenses, select Edit and turn on three things:

• Show Items table on expense and purchase forms
• Track expenses and items by customer
• Make expenses and items billable

Markup rate, billable expense tracking, and sales tax charge are optional settings in the same panel. Save before you leave.

How to link a billable expense to a customer

This is the step that decides whether the cost ever reaches an invoice.

Select Create, then Bill, Expense, or Check. Choose the payee. In the Category column, pick the expense account. Enter the description and amount, tick the Billable checkbox, then select the customer in the Customer column. Add a markup percentage if the contract permits one, then save.

To bill it: Create, then Invoice, then select that customer. The Add to invoice panel opens with the unbilled expense waiting. Select Add and save.

Note that QuickBooks lets you tag either a category line or a product and service item as billable, so the same workflow covers both an ad-hoc cost and a repeat purchase you've set up as an item.

How Xero and NetSuite handle billable expenses

QuickBooks isn't the only place this lives, and the terminology shifts slightly in each.

Billable expenses in Xero

Xero calls them billable expenses, and the tag goes on the transaction as you enter it.

• Assign a customer while entering a bill, spend money transaction, or invoice
• Split line items across different customers, or attach one customer to several
• Approve the bill first, and authorize it separately if it's also an expense claim
• Watch for the "Billable expense can be added" prompt next time you invoice that contact
• Send the cost to a project instead of a customer if you run Xero Projects

Aspire's Xero integration lets you set the Xero account, tax rate, and tracking categories on an expense before you sync it, and receipts go across with it. If your client or project structure lives in Xero tracking categories, map Aspire's reporting fields to them once and the dimension carries through.

Billable expenses in NetSuite

NetSuite calls it billing costs to customers, and it's a feature you switch on rather than a field you fill in.

• Enable Bill Costs To Customers at Setup, Company, Enable Features, Transactions
• Turn on Expenses Billable by Default at Setup, Accounting, Preferences, Time and Expenses, so the Billable box ticks itself whenever you pick a customer
• Add Copy Expense Memos to Invoices on the same subtab, so the client sees an explained line instead of a bare amount
• Configure at least one tax schedule first if you're on OneWorld

Billable expenses in a foreign currency

Here's where an at-cost recovery stops being cost-neutral.

You hire a contractor in Berlin for a US client. You pay EUR 5,000 in March. You invoice in May. The euro moves 3% in between.

In euros, nothing happened. In dollars, you paid USD $5,400 and you're invoicing USD $5,238. The pass-through just cost you USD $162, and it lands in your books as a currency loss rather than politely cancelling out.

Three ways to handle it, decided before the project starts.

Bill at the rate on the spend date. You fix the client's number the day you pay. Predictable for them, and you absorb any movement after that.

Bill at the rate on the invoice date. Your dollar exposure closes, and the client gets a number they can't forecast and will question.

Bill in the currency you paid. The client carries the risk entirely. Clean for you, workable only if their finance team accepts foreign-currency invoices.

Then there's the fee nobody writes into the contract. If you paid that contractor on a card carrying a foreign transaction markup, the markup is part of what left your account, and a contract that says billed at cost usually means the documented invoice amount, not your bank's spread. On six-figure annual supplier spend, an unrecoverable 2% is a bigger number than most of the cashback debates founders have.

If your business regularly fronts client costs in foreign currencies, compare not only the invoice amount but also the FX spread and payment fees that sit between the supplier cost and client recovery. Aspire1 currently supports multi-currency account* across 13 currencies*, with FX pricing from 0.22% above mid-market on its US pricing page.

How billable expenses are taxed

Tax treatment depends on the nature of the underlying expense, who incurred it, how the reimbursement is structured and the taxpayer's reporting method. A client reimbursement may be included in gross receipts while the underlying qualifying business expense is deducted, but not every reimbursed cost is fully deductible and some arrangements have specific rules.

The examples below illustrate common federal rules; they are not a substitute for entity-specific tax advice.

Markups are taxable profit. The pass-through washes. The margin on top doesn't.

Documentation rules are category-specific. For travel, gift and transportation expenses covered by Publication 463, the IRS generally does not require documentary evidence for an expense under $75 other than lodging, although the business still needs adequate records of the relevant details.

Meals carry a 50% limit, and billing can move it. For a self-employed independent contractor, reimbursed meal expenses can be exempt from the contractor's 50% limitation if the contractor adequately accounts to the client for the expenses. In that circumstance, the client becomes subject to the 50% limitation.

Entertainment usually isn't deductible. Most business entertainment expenses are generally nondeductible under current federal rules, although specific statutory exceptions exist. Separately stated qualifying food and beverage costs may be treated differently from the entertainment itself.

Rules vary by entity type. Confirm your treatment with a CPA before you change how you book anything.

Common mistakes that cost you money

Five billable expense failures, in the order they drain margin.

Tagging after the fact. The longer a cost sits untagged, the more likely it gets coded wrong or forgotten entirely. It sits in overhead, margins look lower than they are, and nobody flags it at billing.

Nothing in the contract. The team assumes travel is recoverable, the agreement never says so, the invoice gets disputed, and you write the cost off to keep the relationship.

Inconsistent categories. The same cost type coded three ways makes every report unreliable and turns month-end into archaeology.

Commingled billable and non-billable spend. Mixing client costs with operating costs hides true project profitability and makes accurate invoicing impossible.

Closing the books with unbilled costs still sitting there. Revenue reads low, margin analysis is unreliable, and your forecast rests on a number that was never true. Review the unbilled list before every close.

How to track billable expenses without chasing receipts

Every billable expense failure above shares one root cause. The client attribution happens somewhere other than where the money moves.

Spreadsheets and month-end reconstruction work until they don't, usually at the point where two projects run at once. What replaces them is a system where the tag is attached at the moment of spend and travels with the transaction into the ledger.

Aspire¹ is a financial technology company that puts the business account, corporate cards², and expense management in one place, so the client context is captured at the point of spend instead of reconstructed later. Set budgets at the client, project, or team level, issue a virtual card per engagement, and let the team file claims by scanning a receipt. How that carries into your ledger depends on how you've mapped it, which is the Xero point above.

If you're deciding between tools, our guides to expense management and automated bookkeeping cover the wider setup.