Keep business and personal expenses separate
Save all receipts, invoices, and bank statements
Make sure the expense is ordinary and necessary for your business
Record the expense in your accounting system
Categorize the expense correctly
Deduct the expense in the proper tax year
Track mileage and travel expenses carefully
Document the business purpose of each expense
Follow IRS rules for meals, entertainment, home office, and vehicle expenses
Use a dedicated business bank account and credit card
Consult a tax professional for complex or large expenses