Business expenses are costs that are ordinary and necessary for running your company.
Some expenses are 100% deductible, while others are partially deductible under IRS rules.
The new $6,000 small business deduction expands what can be written off in the first year.
Rho helps you track, categorize, and document expenses automatically for tax-ready reporting.
If you run a startup or small business, every dollar counts. Writing off business expenses reduces taxable income, which lowers your income tax bill and keeps more cash in your account. For founders and finance teams, understanding what qualifies as a deductible expense is crucial for managing cash flow strategically.
The Internal Revenue Service’s (IRS) definition of a business expense covers a wide range of spending, from software subscriptions to travel expenses. The key is documentation. You must be able to show that each expense was business-related and properly recorded.
This guide explains what qualifies as a business expense, how to determine which costs are fully or partially deductible, and how to track them efficiently. It also covers IRS rules, common deduction categories, and how to use Rho to simplify expense tracking and reporting.
What counts as a business expense?
A business expense is any cost directly related to operating your company. The IRS defines a deductible expense as both ordinary (common in your trade) and necessary (helpful for your business). It doesn’t have to be indispensable, but it does have to serve a clear business purpose.
1 - Rent for your office or workspace
Rent is one of the most common deductible business expenses for both startups and established companies. If you lease office space, a coworking membership, or a warehouse, the full amount you pay for rent is generally deductible as a business expense. The IRS considers rent an ordinary and necessary cost of doing business, as long as the space is used exclusively for business purposes.
If you operate from a home office, you may still qualify for a deduction under the home office rules. In that case, you can deduct a portion of your rent or mortgage interest based on the percentage of your home used for business. For example, if your home office occupies 10% of your total living space, you can deduct 10% of your rent, utilities, and related expenses.
2 - Utilities such as electricity, water, and internet
Utilities are fully deductible when they are used for business operations. This includes electricity, water, gas, internet, and phone services for your office or workspace. If you work from home, you can deduct the portion of these utilities that directly support your business use.
For example, if your home office represents 15% of your home’s total square footage, you can deduct 15% of your utility bills. The same rule applies to internet and phone services: if you use them for both personal and business purposes, only the business portion is deductible.
3 - Software subscriptions and apps used for business operations
Software and digital tools are essential for modern businesses, and the IRS allows you to deduct the full cost of these subscriptions as long as they are used for business purposes. This includes accounting software, project management tools, CRM systems, and communication platforms like Slack or Zoom.
If you pay for annual subscriptions, you can deduct the full amount in the year you pay it, even if the service extends into the next year. For example, if you purchase a one-year subscription to QuickBooks or Adobe Creative Cloud, the entire cost is deductible in the current tax year.
4 - Employee wages and benefits
Employee compensation is one of the largest and most important deductible business expenses. You can deduct wages, salaries, bonuses, and commissions paid to employees, as well as employer-paid payroll taxes. Benefits such as health insurance, retirement plan contributions, and paid time off are also fully deductible.
The IRS requires that compensation be reasonable for the work performed. Payments to family members or owners must reflect fair market value for the services provided.
5 - Professional services like legal, accounting, or consulting fees
Professional fees paid to attorneys, accountants, consultants, and other experts are fully deductible as business expenses. These services are considered necessary for running and maintaining your business, whether you’re forming an LLC, preparing tax returns, or seeking strategic advice.
For example, fees paid to a CPA for preparing your tax return or to an attorney for reviewing contracts are deductible in the year they are incurred. Retainers or prepaid fees are also deductible once the services are rendered.
6 - Marketing and advertising costs
Marketing and advertising expenses are fully deductible when they are directly related to promoting your business. This includes digital advertising, social media campaigns, website hosting, print materials, and sponsorships. The IRS considers these costs ordinary and necessary because they help generate business income.
Examples of deductible marketing expenses include:
Paid ads on Google, LinkedIn, or Meta
Website design and hosting fees
Promotional materials such as business cards or brochures
Event sponsorships or trade show fees
Content creation and photography for marketing campaigns
7 - Business insurance premiums
Business insurance protects your company from financial risk, and the premiums you pay are fully deductible. Common types of deductible business insurance include general liability, professional liability, property insurance, and workers’ compensation. If you have employees, health insurance premiums paid by the company are also deductible.
The IRS allows you to deduct insurance premiums as long as the coverage is directly related to your business operations. For example, a tech startup can deduct cybersecurity insurance, while a construction company can deduct equipment and liability coverage.
How much can you write off as a business expense?
There is no fixed limit on how much you can write off. The total deduction depends on your actual business expenses and how they relate to your income. Some categories are fully deductible, while others have limits or require depreciation.
Many common business expenses fall into the partially deductible category, meaning only a portion of the cost can be claimed. For example, meals and entertainment qualify when they are directly tied to business activities, while vehicle costs can be deducted based on either mileage or actual operating expenses.
The same principle applies to cell phone and internet bills, where only the business-use share is deductible. Travel costs such as airfare, lodging, and transportation are also eligible when the trip serves a business purpose, though any personal portion must be excluded.
Keep detailed records for every expense. Rho’s expense management system helps you track these details automatically, linking proof of purchase to each transaction so you can claim every eligible deduction confidently.
What common mistakes trigger an IRS audit?
Certain patterns can draw attention from the IRS. Avoid these red flags:
Claiming 100% business use for vehicles or equipment without proof
Overstating home office space or mixing personal use
Reporting large meal or travel deductions relative to income
Using round numbers instead of actual amounts
Claiming personal expenses as business deductions
Personal expenses are not deductible, even if they indirectly benefit your business. For example, clothing that can be worn outside of work or personal meals cannot be written off.
For every expense you intend to claim, documentation is critical. Keep receipts, invoices, and bank statements that show the amount, date, and business purpose of each expense. If audited, you must be able to prove that every deduction was business-related. If you use Rho, every transaction automatically includes a digital audit trail with proof of payment and category tags, making it easier to substantiate deductions during tax season.
Tax credits vs. tax deductions
Tax deductions reduce taxable income, while tax credits directly reduce your tax bill.
For example, a $1,000 deduction saves $250 if you’re in the 25% tax bracket, but a $1,000 credit reduces your tax bill by the full $1,000.
Common business tax credits include:
Research and development credits
Work opportunity credits for hiring certain employees
Energy efficiency credits for qualifying equipment
Credits and deductions can work together to lower your total tax liability. A CPA can help identify which apply to your business.
Which expenses are 100% deductible?
Some business expenses can be deducted in full from your taxable income. These are costs used exclusively for business purposes.
Common 100% deductible expenses include:
Office rent and utilities
Employee wages, bonuses, and commissions
Employer-paid health insurance and retirement plan contributions
Professional services such as legal, accounting, and consulting fees
Software subscriptions and digital tools used for business operations
Marketing and advertising costs
Business insurance premiums
Office supplies and equipment
Bank fees on your business bank account
These deductions directly reduce your total income tax, lowering your overall tax liability. Tracking them accurately throughout the year prevents missed opportunities. With Rho, every transaction is automatically categorized, and receipts are stored alongside payments, making it easy to export tax-ready reports when filing your return.
Which expenses are partially deductible?
Some expenses are only partially deductible because they have both business and personal components. The IRS sets specific limits for these categories. Here’s a breakdown of the most common deductible categories:
Meals and entertainment are typically 50% deductible when they are directly related to business activities, such as client meetings or team events, and proper documentation is maintained.
Vehicle expenses can be deducted using either the standard mileage rate or actual costs like gas, maintenance, and insurance, as long as you keep a detailed mileage log or track trips through Rho’s expense management tools.
Home office expenses qualify for a deduction when a portion of your home is used regularly and exclusively for business, allowing you to claim a percentage of rent, utilities, and internet based on the office’s square footage.
Cell phone and internet costs are deductible for the portion used for business purposes, which can be calculated by tracking usage or maintaining separate accounts for business and personal use.
Travel expenses, such as airfare, lodging, and transportation, are deductible when the trip is primarily for business purposes. However, personal travel or leisure activities during the same trip are not eligible for deduction.
Accurate tracking is key. Rho’s expense management tool lets you tag transactions by category and add notes about business use. This makes it easier to calculate the correct deduction and maintain compliance with IRS guidelines.
Do I qualify for any special tax deductions?
Beyond everyday operating costs, several IRS provisions allow businesses to accelerate deductions or claim additional tax benefits.
Startup costs
New businesses can deduct up to $5,000 in startup costs and $5,000 in organizational costs in their first year. These include expenses like market research, travel to meet suppliers or customers, and legal fees for forming an LLC or corporation. Any amount above $5,000 must be amortized over 15 years. This deduction helps small business owners reduce taxable income during the critical early stages of growth.
Depreciation and Section 179
When you buy long-term assets such as equipment or furniture, you generally deduct their cost over time through depreciation. The IRS provides schedules for different asset types. Section 179 allows you to deduct the full cost of qualifying equipment in the year it is placed in service, up to certain limits. This can significantly reduce your tax bill in years when you make large purchases.
Qualified business income deduction
Many self-employed individuals, sole proprietors, partnerships, and LLCs may qualify for the Qualified Business Income (QBI) deduction. This allows eligible taxpayers to deduct up to 20% of their qualified business income. The rules are complex and depend on income level and business type, so it’s best to confirm eligibility with a CPA or tax professional.
The $5,000 small business deduction for new startups
The IRS allows new businesses to deduct up to $5,000 for qualifying small business expenses. It typically covers startup costs, professional services, and initial equipment purchases.
This deduction expands what can be written off in the first year, reducing the need for multi-year depreciation. Always verify current IRS guidelines before claiming it, as thresholds and eligibility can change each tax year.
Why you need a structured reimbursement process
Even with corporate credit cards, expense reimbursement remains essential. Employees often pay for business-related costs out of pocket, such as travel expenses, client meals, or one-time purchases from vendors who do not accept cards. Without a structured reimbursement process, these costs can go unrecorded, leading to missed deductions and frustrated employees.
A clear reimbursement policy should include:
A submission of receipts and documentation within a set timeframe.
Managerial approval before payment.
Reimbursement through the company’s bank account, not cash.
Recordkeeping that links each reimbursement to a specific expense category.
A structured reimbursement process prevents missed deductions and keeps records consistent. Rho simplifies this process with automated workflows. Our platform automates approvals, tracks receipts, and syncs reimbursements with your accounting system.
How Rho takes the worry out of expense management
Tracking business expenses manually is both time-consuming and prone to errors. We built Rho to make this process simple, accurate, and audit-ready.
With Rho, you can:
Sync transactions automatically from corporate cards and reimbursements.
Categorize and label expenses for tax-ready exports.
Attach receipts and notes directly to each transaction.
Generate real-time spend analytics for founders and finance teams.
Automate reconciliation and reporting to reduce manual work.
Every transaction in Rho includes a digital audit trail, linking proof of payment to the expense category. This makes it easy to substantiate deductions during tax season or an IRS review.
By centralizing your banking, cards, and expense management, we help you maintain compliance and maximize your tax savings.
Interested in taking the next step? Get started with Rho today.
FAQs about business expenses
How much can I write off as a business expense?
There is no set limit. You can deduct all ordinary and necessary business expenses incurred during the tax year, as long as they are properly documented. Some categories, like meals, have specific percentage limits.
How long should I keep receipts?
Keep business expense records for at least three years after filing your tax return.
How do I track expenses for my tax return?
Use a system that records each transaction with receipts and notes. Rho automates this process by categorizing expenses and storing documentation for tax-ready exports.
How do I write off business expenses on my tax return?
You report business income and deductions on the appropriate tax forms. Sole proprietors use Schedule C (Form 1040), partnerships and LLCs use Form 1065, and corporations use Form 1120. A CPA can help ensure accuracy.
What is the difference between the standard mileage rate and actual expenses?
The standard mileage rate allows you to deduct a fixed amount per business mile driven. The actual expenses method deducts a percentage of total vehicle costs, such as gas, repairs, and insurance, based on business use.
Do I need a CPA to claim deductions?
While you can file your own tax return, working with a CPA helps you identify all eligible deductions and stay compliant with IRS rules. Rho’s reports make it easy to share accurate data with your accountant.