Tax Deduction Checklist 2026: Every Expense You Can Write Off
Self-employed and small business owners can deduct expenses across 11 categories: home office ($5/sq ft simplified method, up to $1,500), vehicle mileage (67 cents/mile in 2026), business equipment (full Section 179 deduction up to $1,220,000), professional services (accountant, lawyer fees), health insurance premiums (100% deductible), professional development (courses, conferences, books), marketing costs, business travel, retirement contributions (Solo 401k up to $70,000), internet and phone (business-use percentage), and supplies. The most commonly overlooked deductions are health insurance premiums, professional development, and the home office deduction.
This checklist covers every major tax deduction available in 2026. Bookmark it, go through it line by line, and make sure you are not missing anything.
What Counts as a Tax Deduction?
A tax deduction is any expense that the IRS allows you to subtract from your gross income before calculating your tax.
Lower taxable income = lower tax bill.
Deductions fall into two main categories:
- Above-the-line deductions: Reduce your adjusted gross income (AGI) regardless of whether you itemize. Examples include student loan interest, HSA contributions, and self-employment tax.
- Below-the-line deductions: You choose between the standard deduction or itemizing individual deductions, whichever is greater.
For 2026, the standard deduction is:
- Single: $15,700
- Married filing jointly: $31,400
- Head of household: $23,500
If your itemized deductions exceed these amounts, itemizing saves you more.
What Home Office Expenses Can You Deduct?
If you work from home, the home office deduction can be significant.
Requirements
- The space must be used regularly and exclusively for business
- It must be your principal place of business
- A dedicated room or clearly defined area qualifies
Simplified Method
- $5 per square foot
- Maximum 300 square feet
- Maximum deduction: $1,500
- No depreciation calculations needed
Regular Method
- Calculate the percentage of your home used for business
- Apply that percentage to actual expenses:
- Rent or mortgage interest
- Utilities (electricity, gas, water)
- Internet and phone bills
- Homeowner’s insurance
- Repairs and maintenance
- Property taxes
The regular method requires more recordkeeping but often yields a larger deduction.
Which Vehicle Expenses Are Deductible?
Business-related driving is deductible. Commuting to your regular workplace is not.
Standard Mileage Rate (2026)
- 67 cents per mile for business use
- Keep a mileage log with date, destination, purpose, and miles driven
- Simpler to track, often better for newer or fuel-efficient vehicles
Actual Expense Method
- Gas and oil
- Insurance
- Repairs and maintenance
- Tires
- Registration fees
- Depreciation
- Lease payments (business portion)
- Parking and tolls
You must choose one method for each vehicle and generally stick with it. Parking fees and tolls are deductible under either method.
Keep a detailed log. The IRS scrutinizes vehicle deductions more than almost any other category.
What Business Equipment Can You Write Off?
Equipment and technology purchases for your business are deductible.
Section 179 Deduction
- Deduct the full cost of qualifying equipment in the year of purchase
- 2026 limit: up to $1,220,000
- Applies to computers, software, office furniture, machinery, and vehicles (with limits)
Bonus Depreciation
- 60% bonus depreciation for 2026 (phasing down from 100% in 2022)
- Applies to new and used equipment
- No dollar limit
Common Deductible Equipment
- Computers, laptops, monitors
- Printers, scanners, copiers
- Software subscriptions (Adobe, Microsoft 365, etc.)
- Cloud services (AWS, Google Cloud)
- Office furniture (desks, chairs, shelving)
- Phones and tablets used for business
Items under $2,500 can be expensed immediately under the de minimis safe harbor rule without Section 179 or depreciation.
What Professional Services Can You Deduct?
Fees paid to professionals for business purposes are deductible.
- Accountant and CPA fees for business tax preparation
- Attorney fees for business-related legal matters
- Bookkeeping services
- Business consulting fees
- Tax preparation software (business portion)
- Payroll service fees
Note: fees for personal tax preparation are not deductible since the Tax Cuts and Jobs Act eliminated miscellaneous itemized deductions.
What Insurance Premiums Are Deductible?
Self-Employed Health Insurance
- Health, dental, and vision premiums for you, your spouse, and dependents
- Deducted above the line (reduces AGI)
- Cannot exceed your net self-employment income
Business Insurance
- General liability insurance
- Professional liability (errors and omissions)
- Business property insurance
- Workers’ compensation
- Business interruption insurance
- Cyber liability insurance
Vehicle Insurance
- Business portion of auto insurance (if using actual expense method)
What Education and Training Expenses Qualify?
Education that maintains or improves skills for your current business is deductible.
Deductible
- Online courses related to your field
- Professional certifications and licensing fees
- Industry conferences and seminars
- Business books and publications
- Professional association memberships and dues
- Workshops and training programs
Not Deductible
- Education that qualifies you for a new profession
- General personal development courses unrelated to business
- Hobby-related classes
Keep receipts, course descriptions, and certificates of completion.
What Marketing and Advertising Costs Can You Deduct?
All ordinary and necessary advertising expenses are deductible.
Digital Marketing
- Google Ads, Facebook Ads, Instagram promotion
- SEO tools and services
- Email marketing software (Mailchimp, ConvertKit)
- Social media management tools
- Website hosting and domain fees
Traditional Marketing
- Business cards and brochures
- Signage and banners
- Direct mail campaigns
- Print advertising
Content Creation
- Freelance writers, designers, videographers
- Stock photo subscriptions
- Video editing software
- Podcast hosting
Business Meals
- 50% of business meals with clients or prospects
- Must discuss business before, during, or after the meal
- Keep the receipt and note who attended and the business purpose
What Travel Expenses Can You Write Off?
Business travel away from your tax home is deductible.
Transportation
- Airfare and train tickets
- Rental cars
- Rideshare (Uber, Lyft) for business trips
- Baggage fees
Lodging
- Hotel rooms for business travel
- Only the business days portion if combining business and personal travel
Meals During Travel
- 50% of meals while traveling for business
- Per diem rates are an alternative (no receipts needed for meals)
Other Travel Expenses
- Tips for service providers
- Dry cleaning during extended trips
- Wi-Fi charges
- Conference registration fees
The trip must be primarily for business. Document the business purpose of each trip.
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What Retirement Contributions Can You Deduct?
Self-employed individuals have powerful retirement savings options.
SEP IRA
- Contribute up to 25% of net self-employment income
- Maximum: $69,000 for 2026
- Simple to set up, flexible contributions
Solo 401(k)
- Employee contribution: up to $23,000 (plus $7,500 catch-up if over 50)
- Employer contribution: up to 25% of net income
- Combined maximum: $69,000 (or $76,500 with catch-up)
Traditional IRA
- Up to $7,000 ($8,000 if over 50)
- May be deductible depending on income and filing status
These deductions reduce your taxable income and build your retirement savings. It is one of the most effective tax strategies available.
What Commonly Overlooked Deductions Should You Check?
These are the deductions people miss most often.
Self-Employment Tax Deduction
- Deduct 50% of your self-employment tax (Social Security and Medicare)
- This is an above-the-line deduction
- Calculated automatically on Schedule SE
Student Loan Interest
- Up to $2,500 per year
- Above-the-line deduction
- Phase-out applies at higher incomes
HSA Contributions
- Individual: $4,300 for 2026
- Family: $8,550 for 2026
- Must have a high-deductible health plan
- Triple tax advantage: deductible, grows tax-free, withdrawn tax-free for medical expenses
State and Local Taxes (SALT)
- Up to $10,000 combined for state income, sales, and property taxes
- Only if you itemize
Charitable Contributions
- Cash donations to qualified organizations
- Fair market value of donated goods
- Mileage for charitable driving (14 cents per mile)
- Keep receipts; donations over $250 need written acknowledgment
How Should You Organize Your Deduction Records?
Good recordkeeping is the foundation of maximizing deductions.
Monthly Habits
- Review bank and credit card statements for business expenses
- Categorize expenses in accounting software (QuickBooks, Wave, FreshBooks)
- Save digital copies of all receipts
- Log business mileage weekly
Before Filing
- Reconcile all business accounts
- Review 1099 forms received
- Check for any missed deductions against this checklist
- Calculate home office square footage
- Tally mileage logs
Records to Keep
- Bank and credit card statements (3 years minimum)
- Receipts for all deductions
- Mileage logs
- Home office measurements and expense calculations
- Contracts and invoices
- Proof of payment for all claimed expenses
Pro tip: Use a dedicated business bank account and credit card. It makes tracking expenses dramatically easier and creates a clear audit trail.
Final Thoughts: Every Dollar Counts
Tax deductions are not loopholes. They are legitimate provisions designed to account for the real costs of earning income.
The key to maximizing your deductions is simple: know what qualifies, keep records, and do not leave money on the table.
Go through this checklist carefully before you file. If your situation is complex, consider working with a CPA, but even if you file yourself, this list ensures you are not missing the big ones.
Your future self, the one who gets to keep more of what they earned, will thank you.
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What is the difference between a tax deduction and a tax credit?
A tax deduction reduces your taxable income, while a tax credit directly reduces the amount of tax you owe. For example, a $1,000 deduction might save you $220 in taxes (at 22% bracket), but a $1,000 credit saves you the full $1,000.
Can I deduct home office expenses if I work from home?
Yes, if you use a dedicated space in your home regularly and exclusively for business. You can use the simplified method ($5 per square foot, up to 300 sq ft) or the regular method based on actual expenses and the percentage of your home used for business.
Do I need receipts for every deduction?
Yes, the IRS requires documentation for all deductions. Keep receipts, bank statements, invoices, and mileage logs. Digital copies are acceptable. The general rule is to keep records for at least 3 years from the date you filed the return.
Can I deduct vehicle expenses for my business?
Yes. You can use the standard mileage rate (67 cents per mile in 2026) or actual expenses (gas, insurance, repairs, depreciation). Keep a detailed mileage log either way. Only business-related driving qualifies—commuting does not.
