Picture this: you're a freelance photographer who drove 9,000 miles to shoots last year, paid $3,600 for a coworking space, and spent $1,800 on editing software. At a combined 30% effective tax rate, those three deductions alone save you $2,970 in taxes.
Now multiply that thinking across your entire business.
About 93% of small business owners believe they overpay their taxes. In most cases, they're right. Not because the rates are wrong, but because they're missing deductions they're entitled to claim. Every legitimate business expense you deduct reduces both your income tax and your self-employment tax.
30-Second Summary: Small business owners can deduct ordinary and necessary business expenses from their taxable income. The biggest deductions include home office, vehicle mileage, retirement contributions, health insurance, and the 20% Qualified Business Income deduction. Track everything, keep receipts, and claim what's yours.
The Rules: "Ordinary and Necessary"
To be deductible, a business expense must be both ordinary (common and accepted in your industry) and necessary (helpful and appropriate for your business). A freelance writer deducting a laptop? Ordinary and necessary. A freelance writer deducting a speedboat? Good luck defending that in an audit.
Deductions go on Schedule C for sole proprietors, reducing your net profit before income tax and self-employment tax are calculated.
The 20 Deductions
1. Home Office Deduction
If you use a dedicated space in your home exclusively and regularly for business, you can deduct it.
| Method | How It Works | Max Deduction |
|---|
| Simplified | $5 per sq ft of office space | $1,500 (300 sq ft max) |
| Actual expenses | Percentage of rent/mortgage, utilities, insurance, repairs | No cap (limited to net business income) |
Worked example: A freelancer rents a 1,500 sq ft apartment for $2,500/month and uses a 150 sq ft room (10%) exclusively as an office.
- Simplified method: 150 × $5 = $750
- Actual method: ($30,000 rent + $3,600 utilities + $240 renter's insurance) × 10% = $3,384
The actual method yields over four times more in this case. But it requires keeping every receipt. The simplified method takes about 30 seconds.
Important: W-2 employees working from home cannot claim the home office deduction. This is exclusively for self-employed individuals.
2. Vehicle Expenses (Standard Mileage)
For 2025, the standard mileage rate is 70 cents per mile. If you drove 12,000 business miles: 12,000 × $0.70 = $8,400 deduction.
You must track mileage (apps like MileIQ make this automatic). Commuting doesn't count. Driving to a client meeting, the office supply store, or the airport for a business trip does.
You can choose actual vehicle expenses instead (gas, insurance, repairs, depreciation), but you generally must commit to one method for the life of the vehicle.
3. Health Insurance Premiums
Self-employed individuals can deduct 100% of health, dental, and long-term care insurance premiums for themselves, their spouse, and dependents. This goes on Schedule 1 as an adjustment to income (not Schedule C), but the tax savings are identical.
A freelancer paying $600/month for coverage through the Healthcare.gov marketplace deducts $7,200, saving roughly $2,160 at a 30% effective rate.
4. Retirement Contributions
| Plan | 2025 Employee Limit | 2025 Employer/Total Limit |
|---|
| Solo 401(k) | $23,500 ($31,000 if 50+) | Up to $70,000 combined |
| SEP IRA | N/A (employer-only) | Up to $70,000 or 25% of compensation |
| SIMPLE IRA | $16,500 ($18,000 if 50+) | Plus 3% employer match |
These reduce income tax but not self-employment tax. At a 22% marginal rate, maxing a Solo 401(k) at $23,500 saves $5,170 in income tax. That's real money. See how retirement fits into your bigger picture with our retirement savings guide.
5. Qualified Business Income (QBI) Deduction
The 20% QBI deduction lets eligible sole proprietors deduct up to 20% of their qualified business income from taxable income. On $100,000 in net business income (assuming taxable income is well below the $197,300 single filer threshold): $100,000 × 20% = $20,000 deduction.
This is an enormous tax break. It doesn't reduce self-employment tax, but it can cut income tax by thousands.
6. Business Insurance
General liability, professional liability (errors and omissions), and business property insurance premiums are fully deductible.
7. Advertising and Marketing
Website costs, Google Ads, Facebook ads, business cards, print materials, and sponsorships. All fully deductible.
8. Software and Subscriptions
Adobe Creative Cloud ($659.88/year), QuickBooks ($360/year), Zoom Pro ($159.90/year), domain registrations, project management tools. Every recurring software cost related to your business is deductible.
9. Office Supplies and Equipment
Pens, paper, printer ink, desk supplies. For larger purchases like a computer or camera, you can either depreciate the cost over several years or use the Section 179 deduction (see #12).
10. Internet and Phone (Business Portion)
If your internet costs $100/month and you use it 60% for business, deduct $720/year. Same logic applies to your cell phone bill. Be honest about the split. The IRS knows you're also streaming Netflix.
11. Professional Services
CPA fees, legal consultations, bookkeeping services, and tax preparation costs. The accountant who saves you $3,000 in taxes while charging $500 is the best deal in business.
12. Section 179 Deduction
For the 2025 tax year, Section 179 lets you deduct up to $2,500,000 in qualifying equipment and software purchases in the year you buy them, instead of depreciating them over multiple years. This applies to computers, office furniture, vehicles (with limits), and machinery.
A photographer who buys a $4,000 camera can deduct the full cost in year one.
13. Bonus Depreciation (100% in 2025)
Bonus depreciation has been restored to 100% for qualified property placed in service after January 19, 2025. This means even larger purchases (that exceed Section 179's scope or don't qualify) can be fully deducted in the year of purchase.
14. Business Travel
Flights, hotels, rental cars, and 50% of meals while traveling away from your tax home for business purposes. The travel must have a clear business purpose; a vacation with "a meeting" tacked on doesn't qualify.
15. Business Meals (50%)
Meals with clients, prospects, or colleagues where business is discussed are 50% deductible. The meal can't be "lavish or extravagant," but reasonable restaurant meals qualify. Solo meals generally don't count unless you're traveling for business.
Entertainment expenses (concert tickets, golf outings, sporting events) remain non-deductible.
16. Education and Professional Development
Courses, workshops, conferences, books, and certifications that maintain or improve skills required in your current business are deductible. A web developer taking an advanced JavaScript course? Deductible. That same developer getting a real estate license? Not deductible (different trade).
17. Startup Costs
If you launched a business this year, you can deduct up to $5,000 in startup costs and $5,000 in organizational costs in your first year, as long as total startup costs don't exceed $50,000. Amounts above $5,000 must be amortized over 180 months.
18. Business Loan Interest
Interest on loans used for business purposes (business credit cards, lines of credit, equipment loans) is fully deductible. Personal loan interest? Not deductible, even if you used the money for business.
19. State and Local Business Taxes
State income taxes on business income, business property taxes, and state-level business licenses or fees are deductible on Schedule C.
20. Contract Labor
Payments to subcontractors, freelancers, or virtual assistants you hire for business purposes are fully deductible. If you pay any individual $600 or more in a year, you'll need to send them a 1099-NEC.
What Happens If Your Business Shows a Loss
If expenses exceed income, your Schedule C shows a net operating loss (NOL). This loss can offset other income (like a spouse's W-2 wages) on your current-year return. Excess losses can be carried forward to future years, limited to 80% of taxable income in the carry-forward year.
The IRS gets suspicious of businesses that consistently show losses. If you lose money in more than two of the last five years, the IRS may question whether your activity qualifies as a business or a hobby.
How to Maximize Deductions Without Red Flags
Here's where the human element matters. The line between aggressive and fraudulent is clearer than people think, but the line between "optimized" and "audit magnet" is blurrier.
Do: Deduct every expense that's genuinely ordinary and necessary for your business. Track it. Keep the receipt. Be specific.
Don't: Claim personal expenses as business costs. Your Netflix subscription isn't a business expense unless you're literally a TV critic. Your entire cell phone bill isn't business if you use it to call your mom.
The safe move: If you're unsure about a deduction, keep the receipt and ask a CPA. A $300 tax consultation is cheaper than defending a $3,000 deduction in an audit. Every time.
Your Next Move
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Audit your own expenses. Look at your bank and credit card statements from the last year. Highlight every business expense. You'll probably find deductions you've been ignoring.
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Choose your home office method. If you work from home, calculate both the simplified and actual methods. Use whichever is larger.
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Start tracking mileage today. Download MileIQ or Everlance. Every untracked mile is money left on the table.
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Open a retirement account. A SEP IRA or Solo 401(k) provides both retirement savings and a current-year tax deduction. See what fits your situation.
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Run the numbers. Use our self-employment tax calculator to see how your deductions reduce your total tax bill. Every $1,000 in deductions saves roughly $300 in combined taxes.
