What Are Incidental Expenses? a Guide for 2026
You get back from a client trip, empty your pockets, and find the usual mess. A parking stub. A bellhop tip you wrote on a hotel notepad. A baggage fee on your card. Maybe a small service charge on the hotel bill. None of it looks important on its own, but together it turns into the question that trips up a lot of freelancers and small teams.
What are incidental expenses, exactly?
The frustrating answer is that the term doesn't have one universal meaning. Under GSA per diem FAQs, incidentals are defined narrowly as tips and fees for porters, baggage carriers, hotel staff, and ship staff. In everyday business use, companies often use the term more loosely and may include things like parking or laundry. That mismatch is one of the main reasons small businesses misclassify travel costs and end up with messy reimbursements, weak records, or tax confusion.
If you've ever looked at a small charge and thought, “It's business-related, so I'll just throw it under miscellaneous,” that's the habit to fix. The clean way to handle incidentals is to ask which rulebook applies first, then code the expense.
Table of Contents
- The Hidden Costs in Your Pocket
- Defining Incidentals The Three Contexts
- What Counts as an Incidental Expense and What Does Not
- Tax and Reimbursement Rules for Small Businesses
- Best Practices for Tracking Incidental Expenses
- Creating a Simple Incidental Expense Policy
- Frequently Asked Questions About Incidental Expenses
- Are laundry and dry cleaning considered incidental expenses during travel
- Do parking fees and tolls count as incidentals or separate travel expenses
- Can I claim bank fees or ATM charges from a business trip
- If the receipt is missing, should I just skip the expense
- Where can I find more help on edge cases
The Hidden Costs in Your Pocket
A lot of expense mistakes start with good intentions. You paid for something small during a work trip, you know it relates to business, and you don't want to waste time over a minor charge. So you label it “incidental” and move on.
That shortcut creates problems later. Your bookkeeper may be using the IRS travel definition. Your client contract may treat those same costs as reimbursable operating expenses. Your own internal policy may group them with travel but not with per diem. The label stays the same, but the treatment changes.
Why small charges cause outsized headaches
Big expenses usually get attention. Airfare, hotels, contractor invoices, software subscriptions. Small charges don't. They're easier to forget, easier to miscode, and more likely to end up in a vague bucket that tells you nothing at tax time.
That matters because even outside business travel, small irregular spending deserves its own tracking logic. The Bureau of Labor Statistics figures summarized by Bankrate show average U.S. household expenditures of $77,280 in 2023, with major spending concentrated in housing at $25,436, transportation at $13,174, and food at $9,985. The same summary reports average monthly household spending of $6,080 in 2022, including an $84 monthly miscellaneous category. Those figures help explain why people tend to separate core bills from low-value irregular spending in the first place, as noted in Bankrate's summary of household budget data.
Practical rule: If a charge is small enough that you're tempted to ignore it, it's exactly the kind of charge that needs a clear category.
The real issue isn't the dollar amount
A baggage tip and a parking garage payment can both be small. That doesn't make them the same type of expense. One may fit a narrow travel-incidental definition. The other may belong under travel, transportation, or client reimbursement, depending on the policy.
That's why the useful question isn't “Is this tiny?” It's “Which definition applies to this expense right now?”
Defining Incidentals The Three Contexts
The phrase incidental expenses makes more sense once you split it into three separate contexts. Most confusion comes from treating them as one category when they're really three overlapping systems.
IRS travel rules
For IRS travel substantiation, the definition is narrow. Under IRS-oriented guidance summarized by Fyle, incidental expenses are limited to fees and tips paid to porters, baggage carriers, bellhops, and hotel or ship staff. That same guidance notes a $75 receipt threshold for many travel expenses, where contemporaneous records can sometimes substitute for receipts if they include the date, amount, place, and business purpose. See Fyle's explanation of incidental expense rules.
Many people often misunderstand this point. They assume “incidental” means any small travel expense. Under this rule set, it doesn't.
Company reimbursement rules
Inside a business, the meaning is often broader. A company may decide that parking, tolls, laundry, baggage fees, mandatory insurance, service charges, or travel-related taxes all belong in an incidental or travel-support category.
That isn't automatically wrong. It just isn't the same thing as the narrow IRS travel definition. Company policy can be broader because reimbursement policy is about internal control and consistency, not just tax vocabulary.
If your policy says parking is reimbursable, reimburse it. Just don't assume that makes it an IRS incidental.
Self-employed tax treatment
If you're self-employed, you don't need to think like an employee submitting a report to payroll. You need to think like the owner maintaining support for business deductions. A cost can be business-related and deductible without fitting the narrow per diem meaning of “incidental.”
That distinction matters in practice. A freelancer may deduct legitimate business travel costs, but when they classify everything under incidentals, they make their records harder to defend and harder for an accountant to review. Clean categories beat clever shortcuts.
Here's the easiest mental model:
- IRS per diem incidentals are a technical travel term.
- Company incidentals are whatever the policy defines and approves.
- Self-employed deductions depend on whether the expense is properly documented and business-related, not whether it sounds incidental.
What Counts as an Incidental Expense and What Does Not
The fastest way to answer what are incidental expenses is to stop asking for one universal list. The same item can move categories depending on the rulebook.
A quick comparison that clears up most confusion
The table below shows how common small charges are typically treated across three practical contexts.
| Expense Item | IRS Per Diem “Incidental” | Typical Company Reimbursement | Self-Employed Tax Deduction |
|---|---|---|---|
| Bellhop tip | Usually yes | Usually yes | Usually treated as a business travel cost if properly documented |
| Porter or baggage carrier tip | Usually yes | Usually yes | Usually treated as a business travel cost if properly documented |
| Hotel staff tip | Usually yes | Usually yes | Usually treated as a business travel cost if properly documented |
| Parking fee | No under the narrow IRS incidental definition | Often yes if policy allows | Often treated as a separate business travel or vehicle-related cost |
| Tolls | No under the narrow IRS incidental definition | Often yes if policy allows | Often treated as a separate business travel or vehicle-related cost |
| Laundry or dry cleaning during travel | Depends on policy context, not the narrow IRS incidental definition | Often yes on longer trips if policy allows | May be treated as a travel-related business cost if support is adequate |
| Baggage fee | Not typically a narrow IRS incidental | Often yes | Often treated as a travel cost |
| Mandatory travel insurance | Not typically a narrow IRS incidental | Sometimes yes if policy defines it that way | Depends on business purpose and documentation |
| Service charge on hotel bill | Not automatically | Often yes if policy allows | Depends on what the charge is for and how it is documented |
| Souvenir | No | Usually no | Usually no |
| Personal snacks unrelated to business purpose | No | Often no or limited by policy | Usually not a clean business deduction |
| ATM fee for trip cash | Not typically a narrow IRS incidental | Sometimes reimbursed, sometimes excluded | Depends on business use and documentation |
The key boundary line comes from the IRS definition already noted earlier. Parking and tolls may be reimbursable business costs, but they aren't automatically “incidentals” under the narrow travel meaning.
What usually is not an incidental
When people hear “incidental,” they often mean “small and annoying.” Bookkeeping needs a tighter standard.
Costs that usually do not belong in an incidental category include:
- Personal purchases like souvenirs, minibar extras for leisure, or non-business convenience items.
- Core travel costs like airfare and lodging. Those are major travel expenses, not supporting extras.
- Meals, unless you're specifically working within a meals and incidental framework and following that rule set.
- Client entertainment or unrelated spending that happened during a trip but didn't serve a business purpose.
A charge doesn't become deductible or reimbursable just because it happened while you were traveling.
A better way to classify gray-area items
When you're unsure, use this order:
- Check the governing policy first. If you're an employee or contractor billing a client, the reimbursement policy controls.
- Check the tax treatment second. Don't force policy wording into tax wording.
- Code for clarity, not convenience. “Parking,” “tolls,” and “tips” are more useful labels than “miscellaneous incidentals.”
That last point saves time later. Your records should help someone else understand the expense without having to ask what you meant.
Tax and Reimbursement Rules for Small Businesses
Small businesses usually run into incidentals in two places. One is employee or contractor reimbursement. The other is year-end tax prep. Those systems overlap, but they don't match perfectly.
What changed for employees
A major shift happened with the 2018 tax law changes. Investopedia's summary of incidental expense treatment notes that most miscellaneous itemized deductions were eliminated for individual taxpayers, which means unreimbursed employee incidentals are generally no longer deductible. The same source explains that employers may still deduct properly reimbursed incidental expenses if records are maintained, and travelers who aren't deducting meals may claim up to $5 per day for incidental expenses only under the federal per diem framework. It also notes that federal lodging and meal per diem environments can vary by region from about $64 to about $309. You can review those details in Investopedia's overview of incidental expenses.
For employees, that means “I'll just deduct it myself later” usually isn't a good fallback anymore. If the business wants people to recover legitimate work costs, it needs a reimbursement process.
What small businesses should do instead
A small business doesn't need a complex travel department to handle this well. It needs a usable process.
Good practice usually looks like this:
- Reimburse through a documented plan. If the business is paying people back, require timely reporting and a business purpose.
- Separate policy labels from tax labels. You can reimburse “parking” without calling it an IRS incidental.
- Choose one method and apply it consistently. Don't let one employee use actual costs while another relies on a loosely interpreted per diem unless your policy clearly allows both.
- Make review simple for the person closing the books. Standard categories reduce back-and-forth.
If you're building that workflow from scratch, it helps to look at how small teams organize expenses, approvals, and reporting inside a unified system rather than across disconnected spreadsheets. This overview of accounting software for small businesses is useful if you're deciding how formal your process needs to be.
The trade-off most owners miss
Per diem can reduce small receipt handling for certain travel situations. Actual-expense reimbursement gives you more detail but creates more admin. Neither is automatically better.
What fails is the middle ground where a business has no clear rule, employees guess, and accounting has to reinterpret every line later. That's where incidentals become expensive, not because the charges are large, but because the cleanup is.
Best Practices for Tracking Incidental Expenses
The biggest risk with incidental expenses isn't usually overspending. It's weak documentation.
Keep records at the time of purchase
Recent guidance summarized by Brex points out that while the IRS uses a $75 receipt benchmark for many expenses, the more important issue for incidentals is auditability. Low-dollar items are often untracked or misclassified, and strong documentation can include contemporaneous logs or detailed credit card statements when a physical receipt is missing. That guidance is summarized in Brex's discussion of incidental expense documentation.
That's the practical standard to work from. If you lose the tiny receipt, you still need a record that makes sense later.
What to capture every time
For small travel and incidental-type costs, log:
- Date when you paid it
- Amount you paid
- Place or merchant
- Business purpose in plain English
- Category that matches your chart of accounts or reimbursement policy
That's enough to turn a fuzzy memory into a usable record.
What works better than a miscellaneous bucket
The old method is a wallet full of paper slips, a month-end spreadsheet, and a few guesses. It doesn't hold up well because the smallest items are the first ones people forget.
A better setup is simple:
- Capture on your phone right away. Don't wait until Friday.
- Attach the image or note to the transaction. Keep proof with the entry.
- Use fixed categories. “Parking,” “tips,” “tolls,” “baggage,” and “service charge” are far more useful than “other.”
- Review weekly. Short review cycles catch duplicates and missing context before memory fades.
If you want to see how a lightweight reporting workflow supports this kind of recordkeeping, the product team's write-up on how reporting was built for everyday expense tracking is worth a read.
Small expenses don't need complicated accounting. They need immediate capture and clean labels.
Creating a Simple Incidental Expense Policy
Even a one-person business benefits from a written policy. Once you hire help, reimburse contractors, or send anyone on client travel, it becomes necessary.
What to put in the policy
A good incidental expense policy fits on one page and answers real questions people have in the moment.
Include these items:
- Define the term clearly. State what your business treats as incidental expenses and what it does not.
- List examples. Name things like porter tips, parking, tolls, service charges, or travel insurance only if your policy includes them.
- Say whether you use per diem or actual reimbursement. Don't leave that to guesswork.
- Set documentation requirements. Explain what employees must submit if a receipt is missing.
- State who approves exceptions. Someone should own edge cases.
Classification depends on the governing rule set, not just the size of the expense. Cornell's definition page for 26 U.S.C. § 501(c)(21) shows that in one legal context, incidental expenses can include legal, accounting, actuarial, and trustee expenses, which proves the term can be scoped very differently depending on the rule involved. See Cornell Law School's statutory definition reference.
A simple rule that prevents most disputes
Don't create a generic “miscellaneous” line if you can avoid it. Map expenses to policy-defined categories instead.
That gives you cleaner reimbursement decisions, cleaner budget reviews, and fewer year-end questions from your accountant. It also helps you spot recurring low-value costs that deserve their own line because they happen often enough to matter.
A practical policy sentence might read like this:
Employees may submit travel-related tips, parking, tolls, baggage fees, and approved service charges under their designated categories. Charges should not be submitted under “miscellaneous” unless finance approves an exception.
That one sentence removes a lot of ambiguity.
Frequently Asked Questions About Incidental Expenses
Are laundry and dry cleaning considered incidental expenses during travel
It depends on the context. Under narrow IRS travel terminology, don't assume laundry automatically counts as an incidental. Under a company travel policy, it may be reimbursable on longer trips. For a self-employed person, the better question is whether it was a legitimate business travel cost and whether you documented it properly.
Do parking fees and tolls count as incidentals or separate travel expenses
They're often better treated as separate travel expenses. Many businesses reimburse them, but that doesn't mean they fit the narrow IRS incidental definition.
Can I claim bank fees or ATM charges from a business trip
Sometimes, but don't default them into incidentals. Treat them based on business purpose, documentation, and your policy. If the charge supported a business payment need during travel, keep a clear note.
If the receipt is missing, should I just skip the expense
Not always. If your rules allow other support, create a contemporaneous record with the date, amount, place, and business purpose. A detailed card statement can help, but it's stronger when paired with your own notes.
Where can I find more help on edge cases
If you want practical answers to workflow and recordkeeping questions, the Xpenses FAQ is a good place to start.
If you're tired of sorting receipts, second-guessing categories, and cleaning up “miscellaneous” expenses at tax time, Xpenses, Inc. gives freelancers and small teams a simpler way to stay organized. You can track expenses, attach receipts, categorize charges clearly, manage invoicing, and keep tax-ready records in one place without building a heavy accounting stack.