What Business Expenses Are Tax Deductible?
If you own a business, you've probably heard someone say,
"Just write it off."
While business tax deductions can reduce your taxable income, not every purchase qualifies as a deductible business expense. Knowing what qualifies as a deductible business expense can help reduce your tax bill while keeping your records organized throughout the year.
Understanding what you can—and can't—deduct can help you save money while avoiding costly mistakes if you're ever audited.
The General Rule
The IRS generally allows businesses to deduct expenses that are:
Ordinary – Common and accepted in your industry.
Necessary – Helpful and appropriate for operating your business.
That doesn't mean an expense has to be absolutely essential, but it should have a legitimate business purpose.
Common Tax-Deductible Business Expenses
Many businesses can deduct expenses such as:
Office supplies
Software subscriptions
Advertising and marketing
Professional fees
Business insurance
Rent
Utilities
Internet and phone used for business
Mileage and vehicle expenses (when eligible)
Employee wages
Payroll taxes
Business travel
Continuing education related to your business
Equipment and tools
Depending on your situation, some purchases may be fully deductible in the year you buy them, while others must be depreciated over time.
Expenses That Often Cause Confusion
Some expenses require additional consideration or documentation.
Examples include:
Meals
Home office expenses
Personal vehicles
Cell phones used for both personal and business purposes
Clothing
Gifts
Travel that combines business and personal activities
Just because something benefits your business doesn't automatically make the entire expense deductible.
Good Records Matter
A deduction is only as good as the records supporting it.
Keep documentation such as:
Receipts
Invoices
Bank statements
Credit card statements
Mileage logs
Notes explaining the business purpose of unusual purchases
Keeping accurate books throughout the year not only makes tax preparation easier, but also provides the documentation needed to support deductions if the IRS ever asks questions.
Good bookkeeping makes tax preparation easier and helps support your deductions if questions arise later. If you're using accounting software, read our guide "Do I Need Bookkeeping If I Have QuickBooks?" to learn why software alone isn't enough.
Don't Guess
Every business is different. Even your accounting method can affect how and when income and expenses are recognized. Learn more in "Cash vs. Accrual Accounting: What's the Difference?"
Factors such as your industry, business structure, and how an expense is used can affect whether it's deductible.
When in doubt, ask before making assumptions.
Receiving good advice before filing your return is almost always less expensive than correcting problems later.
How Tolli Tax Can Help
At Tolli Tax & Accounting, we help businesses understand which expenses are generally deductible, maintain accurate records, and prepare tax returns that comply with IRS requirements.
Learn more about our Business Tax & Accounting Services to see how we can support your business year-round.
Whether you're starting a new business or have been operating for years, understanding deductible expenses is an important part of managing your tax liability. If you're unsure about a specific expense, we're happy to help you evaluate your situation before you file.
Have questions about a specific business expense? Contact Tolli Tax & Accounting to schedule a consultation.
July 23, 2026
Tax laws are complex, and whether a specific expense is deductible depends on your individual circumstances. This article is for general educational purposes and should not be considered tax advice. If you have questions about your specific situation, consult a qualified tax professional.