The IRS allows you to deduct expenses that are ordinary and necessary for running your business. Ordinary means common and accepted in your industry. Necessary means helpful and appropriate for your business operations. Most of what you spend to make money qualifies under this test.

Operating costs form the foundation of business deductions. Rent or lease payments for your workspace, utilities, internet, phone service, office supplies, and software subscriptions all count. If you work from home, you can deduct a portion of your housing costs based on the percentage of your home used exclusively for business.

Employee-related expenses are fully deductible. Wages, salaries, bonuses, employer payroll taxes, health insurance contributions, retirement plan contributions, and workers’ comp insurance all reduce your taxable income. If you hire contractors instead of employees, those payments are deductible too.

Professional services get written off entirely. Your accountant, attorney, bookkeeper, consultant, and any other professional you pay to support your business operations. The fees you pay to a Nampa business tax preparation service come right off your taxable income.

Marketing and advertising expenses are deductible. Website costs, print materials, online ads, signage, promotional items, trade show booths. Building your business visibility counts as a legitimate expense.

Insurance premiums protect your business and reduce your taxes. General liability, professional liability, property insurance, and business interruption coverage are all deductible. Health insurance for yourself as a self-employed owner follows different rules but is still deductible.

Vehicle expenses work two ways. You can either deduct actual costs like gas, maintenance, insurance, and depreciation or take the standard mileage rate. Either way, you need to track business miles separately from personal use. The IRS scrutinizes vehicle deductions closely, so documentation matters.

Equipment and assets get deducted through depreciation over their useful life or immediately using Section 179 if you qualify. Computers, machinery, furniture, vehicles, and building improvements all fall into this category. The rules around immediate expensing versus depreciation change frequently, so this is where professional guidance pays off.

Interest on business loans and credit cards used for business purposes is deductible. So are bank fees, credit card processing fees, and similar financial costs of operating.

Professional development counts when it maintains or improves skills for your current business. Courses, certifications, conferences, industry publications, and relevant memberships all qualify.

What you cannot deduct includes personal expenses, fines and penalties, political contributions, and federal income taxes. Capital expenditures get depreciated rather than deducted immediately. Entertainment expenses are no longer deductible, though business meals remain 50% deductible in most situations.

The deductions only work if you can prove them. Keep receipts, use dedicated business accounts, and categorize expenses correctly in your accounting system. Monthly bookkeeping that tracks expenses by category throughout the year makes tax time straightforward and helps ensure you claim everything you’re entitled to.