Disclaimer: This guide provides general information. Tax laws change and situations vary. Consult a qualified CPA or tax professional for advice specific to your situation.
The average small business owner misses $5,000-$10,000 in deductions annually. This guide covers every major write-off so you keep more of what you earn.
Tax Deduction Basics
A tax deduction reduces your taxable income. If you're in the 22% tax bracket and deduct $1,000, you save $220 in taxes.
To be deductible, an expense must be:
- Ordinary — Common and accepted in your industry
- Necessary — Helpful and appropriate for your business
- Documented — You have receipts or records
Personal expenses are never deductible. Mixed-use items (phone, car, home office) are partially deductible based on business use percentage.
Home Office Deduction
If you work from home, this is one of your biggest deductions.
Requirements:
- Space used regularly and exclusively for business
- Your principal place of business (or where you meet clients)
- Can be a room or defined area (not your kitchen table)
Simplified Method
- $5 per square foot
- Maximum 300 sq ft
- Max deduction: $1,500
- Easy, no complex calculations
Actual Expense Method
- Calculate % of home used
- Deduct that % of: rent/mortgage interest, utilities, insurance, repairs
- Can include depreciation
- Often higher deduction
Example: 200 sq ft office in 2,000 sq ft home = 10%. If housing costs are $24,000/year, deduct $2,400.
Vehicle Deduction
Use your car for business? Two methods to deduct:
Standard Mileage Rate
- 67 cents per mile (2024)
- Track business miles driven
- Simpler record-keeping
- Plus: parking & tolls
Actual Expenses
- Gas, oil, repairs
- Insurance, registration
- Depreciation
- × business use %
What counts as business miles:
- Driving to client meetings or job sites
- Trips to the bank, post office, supply store
- Travel between two work locations
NOT deductible: Commuting from home to a regular office. However, if your home IS your office, trips from home to clients are deductible.
Equipment & Supplies
Fully deductible:
- Computers, laptops, tablets
- Software and subscriptions
- Office furniture (desk, chair, shelves)
- Tools and equipment for your trade
- Office supplies (paper, pens, printer ink)
- Business phone and phone service
- Internet service (business % if mixed use)
Section 179: You can deduct the full cost of equipment in the year purchased (up to $1,160,000 in 2024) instead of depreciating over years. Great for larger purchases.
Professional Services
- Accountant and bookkeeper fees
- Attorney fees (business-related)
- Business consulting
- Tax preparation fees (business portion)
- Payroll service fees
- Virtual assistant or contractor payments
Marketing & Advertising
- Website hosting and domain
- Online advertising (Google, Facebook, etc.)
- Business cards and printed materials
- Signs and vehicle wraps
- Trade show and event fees
- Email marketing software
- Social media management tools
- Logo design and branding
Travel & Meals
Business travel (100% deductible):
- Airfare, train, bus tickets
- Hotel and lodging
- Rental car or rideshare (Uber/Lyft)
- Baggage fees
- Tips related to travel
Business meals (50% deductible):
- Meals with clients discussing business
- Meals while traveling for business
- Team meals during work meetings
Record required: Date, amount, who attended, business purpose discussed. "Lunch with John - discussed website project" is sufficient.
Insurance Premiums
- General liability insurance
- Professional liability (E&O) insurance
- Business property insurance
- Workers' compensation
- Commercial auto insurance
- Health insurance (self-employed can deduct 100% of premiums)
Big one: Self-employed health insurance deduction. You can deduct 100% of health insurance premiums for yourself, spouse, and dependents. This is an "above the line" deduction—you get it even if you don't itemize.
Retirement Contributions
Reduce taxes AND save for retirement:
| Account Type | 2024 Limit | Best For |
|---|---|---|
| SEP-IRA | $69,000 or 25% of income | Simple, high limits |
| Solo 401(k) | $69,000 total | Highest contributions possible |
| SIMPLE IRA | $16,000 | Lower income businesses |
Commonly Missed Deductions
- Bank and credit card fees
- Business license fees
- LLC annual fees
- Professional memberships
- Industry publications
- Education and courses
- Conference registration
- Bad debts (uncollectible invoices)
- Startup costs (up to $5,000)
- Moving expenses for business
- Uniforms and work clothes
- Safety equipment
- Business gifts ($25/person limit)
- Self-employment tax (50% deductible)
Frequently Asked Questions
What is the home office deduction and how do I qualify?
You can deduct expenses for space used "regularly and exclusively" for business. Calculate using simplified method ($5/sq ft, max 300 sq ft = $1,500) or actual expense method (percentage of rent/mortgage, utilities, etc.). Must be your principal place of business.
Can I deduct business meals?
Yes, 50% of business meals are deductible when discussing business with clients, customers, or employees. Keep receipts and note who attended and business purpose. Entertainment (concerts, games) is no longer deductible.
Should I use standard mileage or actual expenses for my car?
Standard mileage (67 cents/mile in 2024) is simpler. Actual expenses (gas, insurance, repairs, depreciation) may yield larger deduction for expensive vehicles. You can only choose actual expenses if you don't use standard mileage the first year.
What records do I need to keep for tax deductions?
Keep receipts, bank statements, mileage logs, and documentation for all deductions. For meals: date, amount, attendees, business purpose. The IRS can audit 3 years back (6 years if income underreported by 25%+). Digital records are acceptable.
Can I deduct startup costs before my business makes money?
Yes. You can deduct up to $5,000 in startup costs the year you begin business (reduced if costs exceed $50,000). Remaining costs are amortized over 15 years. This includes market research, advertising, training, and travel to set up the business.
What's the Section 199A deduction?
The Qualified Business Income (QBI) deduction lets eligible self-employed and pass-through business owners deduct up to 20% of qualified business income. Complex rules apply based on income level and business type. Major tax saver—consult a CPA if your income exceeds $170K (single) or $340K (married).
Calculate Your Self-Employment Tax
See how much you'll owe in SE tax (and how much you can deduct).
SE Tax Calculator →