Small Business Tax Deductions Checklist: 59+ Deductions You Might Be Missing
Most small businesses overpay their taxes — not because they're doing anything wrong, but because they're missing legitimate deductions they're entitled to claim. The IRS estimates that small businesses leave billions in unclaimed deductions on the table every year. This comprehensive checklist covers every major deduction category for small businesses, LLCs, and self-employed individuals in 2025.
According to BookKeeping.business, the average small business client discovers $3,000–$10,000 in additional deductions in their first year of professional bookkeeping — deductions they were missing with DIY bookkeeping.
Quick reference: 59 deductions across 9 categories
Bookmark this page and review it quarterly to make sure you're capturing everything.
Office & Workspace Deductions
8 deductionsWhether you work from home or rent office space, your workspace costs are deductible. These are some of the most valuable deductions for small business owners.
Home office deduction (simplified)
$5/sq ft, up to 300 sq ft = $1,500 max. No need to track actual expenses.
Home office deduction (actual expenses)
Percentage of rent/mortgage, utilities, insurance, repairs, and depreciation based on square footage used for business.
Office rent
Full rent for dedicated office or co-working space. Includes common area maintenance (CAM) charges.
Office utilities
Electricity, gas, water, trash, and internet for your office space. If home office, deduct the business-use percentage.
Internet service
Business percentage of your internet bill. If you work from home and use internet 60% for business, deduct 60%.
Office supplies
Paper, pens, printer ink, postage, cleaning supplies, coffee for the office. No minimum — every dollar counts.
Office furniture
Desks, chairs, filing cabinets, bookshelves. Items over $2,500 may need to be depreciated; under $2,500 can be expensed immediately (de minimis safe harbor).
Rent or lease of equipment
Copiers, printers, postage machines, water coolers. Monthly lease payments are fully deductible.
Vehicle & Travel Deductions
6 deductionsBusiness travel is one of the largest deduction categories. Track mileage carefully — the IRS standard mileage rate for 2025 is $0.70 per mile.
Standard mileage deduction
$0.70/mile for 2025. Track every business mile with an app or log. Cannot use if you also claim actual vehicle expenses.
Actual vehicle expenses
Gas, oil, tires, repairs, insurance, registration, depreciation — multiplied by business-use percentage. Must track total and business miles.
Parking and tolls
Business-related parking fees and highway/bridge tolls. Deductible even if you use the standard mileage rate.
Business travel (airfare, hotels)
Flights, hotels, rental cars, and ground transportation for business trips. Must be primarily for business purposes.
Business meals while traveling
Meals during overnight business travel. 50% deductible. Must document business purpose, attendees, and amount.
Car lease payments
Business percentage of lease payments. Subject to inclusion amount limits for luxury vehicles.
Employee & Contractor Deductions
7 deductionsLabor costs are typically the largest expense for small businesses. Every dollar paid to employees and contractors is deductible when properly documented.
Employee wages and salaries
All compensation paid to W-2 employees, including bonuses, commissions, and overtime.
Employer payroll taxes
Your share of Social Security (6.2%), Medicare (1.45%), federal unemployment (FUTA), and state unemployment (SUTA).
Employee benefits
Health insurance premiums, retirement plan contributions (401k match, SEP-IRA, SIMPLE IRA), life insurance, disability insurance.
Independent contractor payments
All payments to 1099 contractors. Must issue 1099-NEC for payments of $600+ per year. Use our free 1099-NEC generator.
Workers compensation insurance
Required in most states. Fully deductible as a business expense.
Employee education and training
Tuition reimbursement, professional development courses, conferences, and certifications for employees.
Retirement plan contributions
Employer contributions to SEP-IRA (up to 25% of compensation), SIMPLE IRA ($16,500 match limit), or 401(k) plans.
Technology & Software Deductions
6 deductionsEvery SaaS subscription, computer purchase, and phone bill related to your business is deductible. These add up fast for modern businesses.
Computers and laptops
Full purchase price deductible in year one under Section 179 or bonus depreciation. Includes monitors, keyboards, mice.
Software subscriptions (SaaS)
QuickBooks, Slack, Zoom, Microsoft 365, Google Workspace, project management tools, CRM software — all deductible.
Cell phone
Business percentage of your phone bill. If you use your phone 70% for business, deduct 70% of the monthly bill and device cost.
Website hosting and domains
Hosting fees, domain registration, SSL certificates, CDN services, and website maintenance.
Cloud storage and backup
Dropbox, Google Drive, AWS, Azure, iCloud — business-use portion is deductible.
Cybersecurity tools
Antivirus, VPN, password managers, security monitoring, and data protection services.
Professional Services Deductions
5 deductionsFees paid to professionals who help run your business are fully deductible. This includes your bookkeeper, CPA, attorney, and consultants.
Accounting and bookkeeping fees
Monthly bookkeeping service, tax preparation, financial consulting, and audit support. BookKeeping.business plans start at $99/month.
Legal fees
Attorney fees for business formation, contracts, intellectual property, employment law, and general counsel. Litigation costs are also deductible.
Business consulting
Management consultants, marketing strategists, IT consultants, and other professional advisors.
Tax preparation fees
Fees paid to a CPA or tax preparer for business tax returns. Personal tax prep fees are no longer deductible (post-TCJA).
Payroll service fees
Fees paid to payroll providers like Gusto, ADP, or Paychex for processing payroll, filing payroll taxes, and issuing W-2s.
Insurance Deductions
6 deductionsBusiness insurance premiums are fully deductible. Self-employed individuals can also deduct health insurance premiums above the line.
Health insurance (self-employed)
Self-employed individuals can deduct 100% of health, dental, and vision insurance premiums for themselves, spouse, and dependents. This is an above-the-line deduction.
General liability insurance
Protects against third-party claims of bodily injury, property damage, and advertising injury.
Professional liability (E&O)
Errors and omissions insurance for service-based businesses. Essential for consultants, accountants, and attorneys.
Business property insurance
Coverage for office equipment, inventory, and business property against theft, fire, and natural disasters.
Business interruption insurance
Covers lost income when your business is temporarily shut down due to a covered event.
Cyber liability insurance
Covers data breaches, ransomware attacks, and other cyber incidents. Increasingly important for all businesses.
Marketing & Advertising Deductions
6 deductionsEvery dollar spent promoting your business is deductible. This includes both digital and traditional marketing expenses.
Online advertising
Google Ads, Facebook/Instagram ads, LinkedIn ads, TikTok ads, and other paid digital advertising.
Website design and development
Initial website build, redesigns, and ongoing development. Large projects may need to be amortized over 3 years.
SEO and content marketing
SEO services, content writing, blog posts, video production, and social media management.
Business cards and print materials
Business cards, brochures, flyers, banners, and signage.
Sponsorships and events
Sponsoring local events, trade shows, and community organizations for business promotion.
Email marketing tools
Mailchimp, ConvertKit, Constant Contact, and other email marketing platforms.
Education & Training Deductions
5 deductionsInvesting in your skills and knowledge is deductible when it maintains or improves skills required in your current business.
Professional development courses
Online courses, workshops, and seminars that improve skills related to your current business. Must not qualify you for a new profession.
Industry conferences
Registration fees, travel, and lodging for business conferences and trade shows.
Professional certifications
Exam fees, study materials, and continuing education credits required to maintain professional licenses.
Books and subscriptions
Business books, trade publications, industry journals, and professional membership dues.
Coaching and mentoring
Business coaching, executive coaching, and mastermind group fees.
Often-Missed Deductions
10 deductionsThese deductions are legitimate but frequently overlooked. According to BookKeeping.business, these “hidden” deductions save our clients an average of $2,000–$5,000 per year.
Bank and merchant fees
Monthly bank fees, wire transfer fees, credit card processing fees (Stripe, Square, PayPal), and ATM fees for business accounts.
Bad debt write-offs
If a customer owes you money and you can’t collect, you can deduct the unpaid amount. Must use accrual accounting method and document collection efforts.
Startup costs
Up to $5,000 in startup costs can be deducted in year one (if total startup costs are under $50,000). Remaining costs amortized over 15 years.
Business loan interest
Interest on business loans, lines of credit, and business credit cards. The principal is not deductible, but all interest is.
Moving expenses for business
If you relocate your business, moving costs for equipment, inventory, and office furniture are deductible.
Charitable contributions
C-Corps can deduct charitable donations directly. For pass-through entities (LLCs, S-Corps), donations flow to the owner’s personal return.
State and local business taxes
State income tax, franchise tax, sales tax collected and remitted, and local business license fees.
Depreciation (Section 179)
Deduct the full cost of qualifying equipment and property in the year purchased, up to $1,220,000 for 2025. Includes vehicles, machinery, and furniture.
Qualified Business Income (QBI) deduction
Pass-through business owners may deduct up to 20% of qualified business income. Subject to income limits and specified service business restrictions.
Health Savings Account (HSA) contributions
If you have a high-deductible health plan, contribute up to $4,300 (individual) or $8,550 (family) for 2025. Tax-deductible, grows tax-free, and withdrawals for medical expenses are tax-free.
How Proper Bookkeeping Maximizes Your Deductions
Knowing which deductions exist is only half the battle. The other half is having the systems and processes to capture, categorize, and document every deductible expense throughout the year. Here's how professional bookkeeping turns this checklist into actual tax savings:
Real-Time Transaction Categorization
Every transaction is categorized as it happens — not scrambled together at year-end. This means deductible expenses are captured in the correct category immediately, reducing the chance of anything falling through the cracks. BookKeeping.business categorizes transactions weekly, not monthly.
Receipt Capture and Documentation
The IRS requires substantiation for deductions. A bookkeeping service with receipt capture (like BookKeeping.business's AI-powered system) ensures every expense has supporting documentation. No more shoebox of receipts at tax time — everything is digital, organized, and audit-ready.
Industry-Specific Knowledge
A bookkeeper who knows your industry knows which deductions apply to you. Restaurant owners get tip credit guidance. Real estate investors get depreciation schedules. Contractors get job costing. Generic bookkeeping misses industry-specific deductions worth thousands per year.
Year-End Tax Package
Clean books mean your CPA spends time on tax strategy, not data entry. A well-organized year-end package with categorized expenses, reconciled accounts, and supporting documents reduces your tax prep bill by $500–$2,000 and ensures your CPA can focus on maximizing your deductions.
Quarterly Tax Estimates
With accurate books, you can calculate quarterly estimated tax payments based on actual income and deductions — not guesswork. This prevents underpayment penalties and helps with cash flow planning. Use our free quarterly tax calculator to estimate your payments.
Frequently Asked Questions About Business Tax Deductions
Let us find your missing deductions
BookKeeping.business clients discover an average of $3,000–$10,000 in additional deductions in their first year. Our bookkeepers know your industry, track every expense, and ensure nothing falls through the cracks. Plans start at $99/month with all software included.