The IRS uses two words to define what’s deductible: ordinary and necessary. An ordinary expense is common and accepted in your industry. A necessary expense is helpful and appropriate for your business. If a cost meets both criteria, you can generally deduct it.

Rent and occupancy costs are fully deductible. This includes your lease payments, utilities, property insurance, repairs, and maintenance. If you work from a home office, you can deduct a portion of your housing costs based on the square footage used exclusively for business.

Payroll and labor costs include wages, salaries, employer payroll taxes, health insurance contributions, retirement plan contributions, and workers’ compensation insurance. These are typically a business’s largest deductible expense category.

Professional services are deductible. Fees paid to your accountant, attorney, bookkeeper, or consultants count. So do industry-specific services like marketing agencies or IT support. If you’re working with premium business accounting in Boca Raton or anywhere else, those fees reduce your taxable income.

Insurance premiums for business policies are deductible. General liability, professional liability, property insurance, and business interruption coverage all qualify. Health insurance premiums you pay for yourself get handled differently depending on your business structure but are still deductible.

Office expenses and supplies include everything from pens and paper to software subscriptions and computer equipment. Small items are expensed in the year purchased. Larger equipment purchases may need to be depreciated over time or deducted using Section 179.

Marketing and advertising costs are fully deductible. Your website, online ads, print materials, signage, and promotional events all count. Sponsoring a local event or sports team in Palm Beach County is a business expense if it promotes your company.

Travel expenses for business purposes are deductible. Airfare, hotels, rental cars, and 50% of meals while traveling qualify. The trip must have a primary business purpose, and you need documentation showing what the business reason was.

Vehicle expenses can be deducted using either actual costs or the standard mileage rate. If you use a vehicle for both business and personal purposes, only the business portion qualifies. Keep a mileage log or use an app to track business trips.

Interest on business loans and credit cards used for business purposes is deductible. This includes lines of credit, equipment financing, and business credit card interest. Personal loan interest used for business purposes can qualify, but documentation becomes important.

Licenses, permits, and professional memberships are deductible. Your business license, industry certifications, trade association dues, and continuing education costs all count.

What’s not deductible includes fines and penalties, political contributions, personal expenses, and federal income taxes. Meals and entertainment used to be more broadly deductible, but current rules limit meal deductions to 50% and eliminate entertainment deductions entirely.

The deduction only works if you can prove it. Keep receipts, use a dedicated business bank account and credit card, and categorize expenses correctly in your accounting system. A well-organized set of books makes business tax return preparation straightforward and ensures you’re not leaving legitimate deductions on the table.

When in doubt about whether something qualifies, ask whether it’s ordinary in your industry and necessary for your operations. If both answers are yes, and you have documentation, you’re likely on solid ground.