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Business Deductions Checklist: 35+ Tax Write-Offs You're Probably Missing
Every dollar you deduct reduces your taxable income. At a 30% combined tax rate, a $1,000 deduction saves you $300 in taxes. Most small business owners miss thousands in legitimate deductions because they don't know what qualifies. Here's the complete list, organized by category, with real dollar examples.
The Math That Matters
If you find $10,000 in deductions you've been missing:
At 15.3% SE tax + 22% income tax = 37.3% combined rate
Annual tax savings: $3,730
Over 5 years, that's $18,650 back in your pocket.
If you find $10,000 in deductions you've been missing:
At 15.3% SE tax + 22% income tax = 37.3% combined rate
Annual tax savings: $3,730
Over 5 years, that's $18,650 back in your pocket.
The golden rule: A business expense is deductible if it is ordinary (common in your industry) and necessary (helpful and appropriate for your business). Keep receipts for everything. Use a dedicated business bank account and credit card so every transaction is automatically documented. See our Banking guide.
Category 1 — Home Office
Home Office Deductions
Home office deduction (simplified method)$5 per square foot, up to 300 sq ft. No receipts needed.200 sq ft office = $1,000 deduction
Home office deduction (actual method)Percentage of home expenses based on office square footage. Includes rent/mortgage interest, utilities, insurance, repairs, depreciation.200 sq ft / 1,500 sq ft home = 13.3% of $24,000 in home costs = $3,192
Internet serviceBusiness-use percentage of your monthly internet bill.70% business use × $80/mo = $672/yr
Phone serviceBusiness-use percentage of your cell phone bill, or 100% of a dedicated business line.60% business use × $100/mo = $720/yr
Category 2 — Vehicle & Travel
Vehicle and Travel Deductions
Standard mileage rate70 cents per mile for 2025 (IRS sets this annually). Track with an app like MileIQ or Everlance.8,000 business miles × $0.70 = $5,600 deduction
Actual vehicle expensesAlternative to mileage: deduct business-use percentage of gas, insurance, maintenance, registration, depreciation, lease payments.60% business use × $9,000 annual vehicle costs = $5,400
Business travelFlights, hotels, rental cars, parking, tolls, ride-shares for business trips.3 business trips/yr averaging $1,200 each = $3,600
Meals during business travel50% deductible when traveling overnight for business. Must be away from your "tax home."50% × $2,400/yr in business meals = $1,200
Parking and tollsBusiness-related parking and highway tolls are 100% deductible (not subject to the 50% meal limit).$50/mo in parking + tolls = $600/yr
Category 3 — Equipment & Technology
Equipment and Technology Deductions
Section 179 deductionImmediately deduct the full cost of business equipment in the year purchased (up to $1,220,000 for 2024). Computers, furniture, machinery, vehicles.New laptop ($1,800) + desk ($600) + monitor ($500) = $2,900 deducted in year 1
Software and subscriptionsBusiness software, SaaS tools, cloud services, project management tools.QuickBooks ($30/mo) + Canva ($13/mo) + Zoom ($16/mo) + Slack ($8/mo) = $804/yr
Website costsDomain registration, hosting, website builder subscription, SSL certificates, design tools.Hosting ($25/mo) + domain ($15/yr) + builder ($16/mo) = $507/yr
Office suppliesPaper, ink, pens, notebooks, printer cartridges, postage, shipping supplies.$50–$200/month = $600–$2,400/yr
Category 4 — Professional Services
Professional Services Deductions
Accounting and bookkeepingCPA fees, tax preparation, bookkeeping services, payroll processing fees.Tax prep ($500) + monthly bookkeeping ($200/mo) = $2,900/yr
Legal feesBusiness-related legal advice, contract review, LLC formation costs, trademark registration.Contract review ($750) + annual legal retainer ($1,200) = $1,950
Contractors and freelancersPayments to 1099 contractors — designers, developers, writers, virtual assistants.$2,000/mo in contractor payments = $24,000/yr
Consulting feesBusiness coaches, strategy consultants, industry advisors.Monthly coaching ($500/mo) = $6,000/yr
Category 5 — Insurance
Insurance Deductions
Health insurance premiums (self-employed)100% deductible for self-employed individuals — this is an above-the-line deduction (reduces AGI, not just taxable income). Covers you, your spouse, and dependents.$600/mo premium = $7,200/yr deduction
Business insuranceGeneral liability, professional liability (E&O), product liability, commercial property, cyber insurance.General liability ($50/mo) + E&O ($100/mo) = $1,800/yr
Workers' compensationRequired in most states if you have employees. Fully deductible.Varies — typically $500–$3,000/yr for small businesses
Category 6 — Marketing & Advertising
Marketing and Advertising Deductions
Online advertisingGoogle Ads, Meta/Facebook Ads, LinkedIn Ads, TikTok Ads, X/Twitter Ads.$500/mo ad spend = $6,000/yr
Social media toolsScheduling tools, analytics, design platforms for marketing content.Buffer ($15/mo) + Canva Pro ($13/mo) = $336/yr
Business cards and print materialsBusiness cards, brochures, flyers, signage, banners.$200–$1,000/yr
Email marketingMailchimp, ConvertKit, Beehiiv, or other email platform subscriptions.$30/mo = $360/yr
Sponsorships and eventsLocal event sponsorships, trade shows, conference exhibition fees.$500–$5,000/yr depending on involvement
Category 7 — Retirement & Savings
Retirement Deductions
SEP-IRA contributionsUp to 25% of net self-employment income, max $69,000 for 2024. Easiest retirement account for self-employed.$100K net income × 25% = $25,000 deduction
Solo 401(k) contributionsEmployee side: $23,000 (under 50) or $30,500 (50+). Plus employer side: up to 25% of income. Total max $69,000.$23,000 employee + $15,000 employer = $38,000 deduction
SIMPLE IRAEmployee deferral up to $16,000 (2024) plus employer match up to 3%.$16,000 employee + $3,000 match = $19,000
The most missed deduction: Self-employed health insurance. Many sole proprietors and LLC owners pay $500–$1,000/month for health insurance and never deduct it because they don't realize it's an above-the-line deduction. At $800/mo, that's $9,600/yr — saving roughly $3,500 in taxes at a 37% combined rate. You don't need to itemize to take this deduction.
Category 8 — Education & Development
Education and Professional Development
Courses and trainingOnline courses, workshops, certifications that maintain or improve skills for your current business.3 online courses at $200 each = $600/yr
Books and publicationsBusiness books, industry journals, research subscriptions, trade publications.$20/mo in books + $100/yr WSJ = $340/yr
Conferences and seminarsRegistration fees, travel, and meals for industry conferences. Must be directly related to your business.Annual conference: $500 registration + $1,200 travel = $1,700
Professional membershipsIndustry associations, chambers of commerce, professional organizations, co-working space memberships.Chamber of commerce ($300) + coworking ($200/mo) = $2,700/yr
Category 9 — Other Common Deductions
Frequently Missed Deductions
Startup costsUp to $5,000 in startup expenses deductible in year one. Remainder amortized over 15 years. Includes market research, pre-opening advertising, travel to scope business, consulting fees before launch.$5,000 deduction in year 1
Bank and payment processing feesMonthly bank fees, wire fees, credit card processing fees (Stripe/Square/PayPal charges).3% processing on $100K sales = $3,000/yr
Business loan interestInterest on business loans, business credit cards, and lines of credit.$50K loan at 8% = $4,000 in deductible interest
State and local taxesState income taxes, business license fees, annual report fees, franchise taxes — all deductible on federal return.CA franchise tax ($800) + city license ($150) = $950
Bad debtsInvoices you've included in income that became uncollectable. Must have made reasonable collection efforts.2 unpaid invoices totaling $3,500
Charitable contributionsDeductible for C-Corps directly. For pass-through entities, flows to your personal return (if you itemize).Varies
The Deductions You Cannot Take
→ Personal expenses disguised as business — your gym membership is not deductible unless you're a personal trainer
→ Commuting costs — driving from home to your regular office is not deductible (home office changes this)
→ Clothing — unless it's a uniform or costume you wouldn't wear outside work (suits don't count)
→ Political contributions — never deductible
→ Fines and penalties — traffic tickets, government penalties are not deductible
→ Personal portion of mixed expenses — only the business percentage of phone, internet, vehicle, etc.
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Disclaimer: This guide is for informational purposes only and is not tax advice. Deduction eligibility depends on your specific situation, business type, and applicable tax law. Consult a qualified CPA or tax professional before claiming deductions.