Incidental expenses are the minor, often unexpected costs that come up during business travel or daily operations, from tips for hotel staff to parking fees and Wi-Fi charges at an airport.

These costs are easy to overlook individually, but they can quietly erode your budget if you don't have a system to track them.

What are incidental expenses?

Incidental expenses are minor, often unexpected costs that arise during business travel or day-to-day operations, supplementing larger budgeted expenses such as lodging, airfare, or office rent. Unlike your primary trip or project costs, incidentals aren't typically planned for in advance, but they're still necessary for conducting business.

For small businesses, untracked incidentals can strain a tight budget. For larger organizations, they may only surface a few times a year. Either way, the key is to track and manage business expenses so they don't quietly add up.

Common types of incidental expenses

Incidental expenses cover dozens of small costs across different business expense categories. Knowing the most common categories helps you build policies that capture these charges.

Travel and transportation

Most incidental expenses come up during business travel. These are the small costs that fall outside your main booking but are still necessary to get the job done.

• Tips for service workers: Gratuities for hotel housekeeping, bellhops, restaurant servers, and rideshare drivers are classic incidentals that rarely come with receipts
• Parking fees and tolls: Whether you're renting a car or driving to a client site, parking garage fees and highway tolls add up across a multi-day trip
• Wi-Fi charges: Airport or hotel Wi-Fi fees are a common incidental when your accommodation doesn't include complimentary internet access
• Laundry and dry cleaning: Extended business trips often require laundry services, especially when your itinerary stretches beyond a few days
• ATM and currency exchange fees: International travel introduces bank fees for cash withdrawals and currency conversions that aren't part of your core travel budget

Office and administrative

Not all incidentals happen on the road. Day-to-day operations generate their own set of small, unplanned costs.

• Printing and photocopying: Last-minute print jobs for client presentations, contracts, or training materials are a recurring incidental for many teams
• Equipment repair: Minor fixes to office equipment, like replacing a keyboard or repairing a monitor, often fall outside your regular IT budget
• Shipping and mailing: Unexpected courier fees for rush deliveries or forgotten documents can catch you off guard
• Event supplies: Small purchases for team meetings or client visits, such as name badges, signage, or decor, are easy to overlook in expense reports

Team and employee

People-related incidentals are some of the hardest to predict because they depend on team size, culture, and activity.

• Snacks and refreshments for meetings: Coffee runs, catered lunches for working sessions, and break room supplies fall into this category
• Small recognition awards: Gift cards, tokens of appreciation, or team celebration costs are common incidentals for managers
• Damage or loss replacement: Replacing a lost company badge, broken phone case, or damaged accessory is an incidental that most expense policies don't explicitly address

Primary meals, major transportation costs such as airfare, lodging, and client entertainment typically fall under their own budget categories rather than incidentals.

Incidental expenses vs. other business expenses

Understanding what qualifies as an incidental cost versus other expense types helps you categorize spending correctly and set the right policies for each.

The distinction matters most at tax time and during budgeting. Incidental fees follow different documentation rules and deduction methods than operating or capital expenses. Understanding the difference between incidentals and miscellaneous expenses also helps you categorize spend more accurately in your general ledger.

Are incidental expenses tax-deductible?

Incidental expenses can be tax-deductible, but the specifics depend on your local tax laws, the types of costs involved, and the IRS requirement that business expenses be "ordinary and necessary." The rules vary depending on whether you're self-employed or a W-2 employee, and on whether your company uses per diem rates or itemized reporting.

• Your company can usually deduct incidental expenses that are directly related to normal business operations. This includes tips for hotel staff, office supplies, printing, and other business travel expenses.
• Keeping accurate, descriptive, and up-to-date records of incidental expenses is important for supporting these deductions and protecting your company in the event of an audit. Always collect relevant documents like receipts and bills with details about the location, time, and the goods or services involved.
• The Tax Cuts and Jobs Act of 2017 (TCJA) suspended unreimbursed employee expense deductions for W-2 employees starting in 2018, and the One Big Beautiful Bill Act made that suspension permanent. Self-employed individuals can still deduct qualifying incidentals on Schedule C.

The per diem rate for incidentals

The GSA sets a separate incidentals-only per diem rate of $5 per day. This rate covers fees and tips given to porters, baggage carriers, hotel staff, and staff on ships.

Per diem simplifies tracking for both employees and finance teams. Instead of itemizing every tip or small charge, employees receive a flat daily allowance. Your company doesn't need to collect individual receipts for costs covered by the per diem rate. You can find current rates on the GSA.gov per diem rates page.

Receipt requirements

The IRS doesn't require receipts for individual business expenses under $75, except for lodging. If your company uses a per diem rate for incidentals, employees don't need to provide receipts for expenses covered by the flat daily allowance.

That said, it's still good practice to log all incidental expenses for internal tracking and audit readiness. Even when receipts aren't required, a simple record of the date, amount, and business purpose can save you time if questions come up later. Keeping organized expense receipts also protects you if your records are ever reviewed.

Challenges of managing incidental expenses

Even with clear policies, incidental expenses create recurring headaches for finance teams. Three challenges come up most often.

Difficulty planning and tracking

By their nature, incidentals are often unpredictable and unplanned. It's challenging to budget for these expenses, as costs can vary depending on the nature of the trip or activity, or the location where it takes place.

Additionally, some incidental costs may come without receipts. For example, employees don't receive receipts for the cash tips they give to hotel staff, such as housekeeping or valets, which makes some incidental charges particularly difficult to track. Employees may end up paying for them out of pocket.

Risk of expense fraud

The lack of receipts for some incidentals makes it easier for employees to submit fraudulent claims. With no paper trail, employees may feel more comfortable inflating an expense reimbursement and keeping the difference for themselves.

Even without deliberate intent, the lack of documentation creates conditions where fraud can go undetected.

Inaccurate or missing data

The two challenges above can make it hard for you to forecast or report on incidental expenses accurately. Without receipts, employees must manually report incidentals, which can lead to simple human error. They may even forget to add some incidentals to their expense claims entirely.

While these costs are generally small, they can add up over time and amount to significant company spend. This can skew financial analyses and forecasting, creating an unclear picture of your company's financial health. For employees who cover costs out of pocket, delayed reporting can also complicate year-end tracking of unreimbursed employee expenses.

How to track incidental expenses

Tracking is the bridge between knowing what incidentals are and managing them. Without a reliable system, even the best travel and expense policies fall apart.

Manual methods like spreadsheet logs, per diem envelopes, and paper receipt folders give you basic visibility. They work for teams with low travel volume, but they don't scale well. The more employees you have on the road, the more gaps appear in your data.

Digital tools solve the scalability problem. Expense tracking software with auto-categorization, mobile receipt capture, and corporate card transaction feeds eliminates the receipt gap that makes incidentals so hard to track. When every card swipe is logged automatically, you no longer rely on employees to remember and report every small charge.

Consider the difference in practice. With an automated system, an employee swipes a corporate card at a hotel gift shop. The $12 charge auto-categorizes as a travel incidental, and a text message prompts the employee to snap a photo of the receipt. The transaction shows up in your dashboard in real time, coded and ready for review. With a manual spreadsheet, that same $12 charge might sit in the employee's wallet for weeks before they remember to log it, if they log it at all.

The right tracking method depends on your team's size and travel frequency, but the goal is the same: Capture every incidental so you can manage it.

Tips for managing incidental expenses

Managing incidental expenses well gives you an accurate picture of your financial situation. Without a clear process, these small costs slip through the cracks and distort your budget over time.

Set up a process

Set up specific procedures for handling incidental expenses. These might include a process for managers to approve incidental spending claims and authorize reimbursement. Establish requirements such as receipts or other documentation and multiple channels of approval in certain instances.

Communicate expectations

Establish company rules that dictate what counts as an incidental expense and what to do about these costs. Clear documentation requirements also reduce the risk of expense fraud. Communicate to employees the process for tracking incidentals, including which documents to submit and how to obtain reimbursements.

Establish a budget

Create a budget that accounts for incidentals by reviewing your company's historical financial records. Review the data to determine past incidental expenses and any recurring patterns. This will help you establish the usual incidental sources and how much money goes toward them.

Try to separate incidentals into expense categories to allocate the correct portions of your budget to these areas.

Set travel guidelines

Setting clear travel and expense guidelines can help control incidental expenses. For example, you could implement a per diem allowance to cover any incidental costs employees incur during business travel. The GSA's incidentals-only per diem rate of $5/day is a common benchmark for setting these allowances.

If the employee spends more than the established per diem, they either pay out of pocket or have to submit a valid business case for the expense. As an alternative, some corporate cards let you set spend limits at the card or expense policy level.

Build a contingency fund

Incidental expenses tend to be small, but they can add up, especially if they aren't anticipated. Having a clear expense reimbursement policy helps set expectations for how contingency funds are used.

Occasionally, there might be higher-cost incidentals as well. Creating a contingency fund with designated money for incidentals can provide some reassurance in the event of unexpected costs.

Keep your system updated

Monitor your expenses closely. Adjust your budget and how much you set aside for incidental expenses based on past spending and future projections. Update company policies around incidentals to maximize savings and efficiency as needed.

Nothing in business financing is set in stone, and you'll likely find room for improvement in certain areas. By tracking spending patterns and reviewing your expense management workflows, you can make informed decisions about your budget.

Automate expense tracking

Keeping track of any company expenses, including incidental expenses, can be a huge hassle for you and your employees. Consider implementing expense management software or other accounting systems that allow you to automate the tedious and time-consuming parts of expense tracking.

Manage incidental expenses with Ramp

The biggest challenges with incidental expenses all come back to the same root cause: You can't manage what you can't see. Tracking gaps, fraud risk, and inaccurate data are symptoms of a manual process that wasn't built for the volume and variety of modern business spending.

Ramp's expense management platform tackles each of these problems directly:

• Auto-categorization and receipt capture: Every corporate card transaction is automatically categorized, and employees can capture receipts via mobile app, SMS, or email. This eliminates the manual logging burden that makes incidentals so hard to track.
• Spend limits and policy controls: You can set per-category or per-trip limits on corporate cards so incidental spending stays within policy before the charge goes through. No more chasing down overages after the fact.
• Real-time dashboards: See incidental spending as it happens, broken down by category, employee, or trip. Accurate, up-to-date data means your forecasts and budgets reflect reality instead of best guesses.

When every incidental is captured at the point of sale, you don't have to choose between tight controls and a smooth employee experience. You get both.

Try an interactive demo to see how Ramp helps you manage incidental expenses.