Maximizing your tax deductions is one of the most impactful things you can do as a small business owner. Every dollar you deduct reduces your taxable income — and your tax bill. Here’s every deduction available to small businesses in 2026.
Quick answer: Key 2026 deductions: home office ($1,500 simplified), mileage ($0.70/mile), Section 179 ($1.16M), startup costs ($5,000), self-employed health insurance (100% of premiums).
Home Office Deduction
Two Methods to Calculate
| Method | How It Works | Max Deduction | Best For |
|---|---|---|---|
| Simplified method | $5 per square foot of home office | $1,500 (300 sq ft max) | Easy calculation, small offices |
| Regular method | Actual expenses × business use percentage | No cap (based on actual costs) | Larger offices, high mortgage/rent |
Regular Method Example
| Expense | Annual Amount | Business Use % (15%) | Deductible Amount |
|---|---|---|---|
| Mortgage interest or rent | $18,000 | 15% | $2,700 |
| Property taxes | $4,000 | 15% | $600 |
| Homeowners insurance | $1,500 | 15% | $225 |
| Utilities (electric, gas, water) | $3,600 | 15% | $540 |
| Internet | $1,200 | 15% | $180 |
| Home repairs/maintenance | $2,000 | 15% | $300 |
| Total home office deduction | $4,545 |
Business use percentage = office square footage ÷ total home square footage
Vehicle and Transportation Deductions
Two Methods for Vehicle Expenses
| Method | 2026 Rate/Approach | Best For |
|---|---|---|
| Standard mileage rate | 70 cents per mile (estimated 2026) | Most people; simpler calculation |
| Actual expense method | Track all car costs × business use % | High vehicle costs, luxury vehicles |
Standard Mileage Deduction Examples
| Annual Business Miles | Rate (2026 est.) | Deduction |
|---|---|---|
| 5,000 miles | $0.70/mile | $3,500 |
| 10,000 miles | $0.70/mile | $7,000 |
| 15,000 miles | $0.70/mile | $10,500 |
| 20,000 miles | $0.70/mile | $14,000 |
| 30,000 miles | $0.70/mile | $21,000 |
What Counts as Business Mileage
| Deductible | Not Deductible |
|---|---|
| Driving to client meetings | Your regular home-to-office commute |
| Trips to the bank, post office, supply store | Personal errands combined with business trips |
| Visiting job sites or properties | Commuting to a co-working space (if it’s your regular office) |
| Travel between two business locations | Driving to lunch (unless a business meal) |
| Driving to networking events | Weekend drives that aren’t business-related |
Office Supplies and Equipment
Section 179 and Bonus Depreciation
| Deduction Type | 2026 Limit | What It Does |
|---|---|---|
| Section 179 | $1,250,000 (estimated) | Deduct the full cost of qualifying equipment in year one |
| Bonus depreciation | 60% (2026, phasing down) | Deduct 60% of cost in year one, depreciate the rest |
| De minimis safe harbor | $2,500 per item | Expense items costing $2,500 or less without capitalizing |
Common Equipment Deductions
| Item | Typical Cost | Deduction Method |
|---|---|---|
| Computer/laptop | $1,000-$3,000 | Section 179 or de minimis |
| Monitor(s) | $200-$800 | De minimis |
| Office furniture (desk, chair) | $300-$2,000 | De minimis or Section 179 |
| Printer/scanner | $100-$500 | De minimis |
| Phone | $800-$1,400 | De minimis (% business use) |
| Software subscriptions | $50-$500/month | Currently deductible expense |
| Tools and equipment | Varies | Section 179 |
| Vehicle (business use only) | $30,000-$80,000 | Section 179 (limits apply to vehicles) |
Operating Expense Deductions
Fully Deductible Business Expenses
| Expense Category | Examples | Notes |
|---|---|---|
| Advertising and marketing | Google Ads, Facebook Ads, print materials, website costs | 100% deductible |
| Professional services | Accounting, legal, consulting, bookkeeping | 100% deductible |
| Insurance premiums | General liability, E&O, property, cyber | 100% deductible |
| Office supplies | Paper, ink, postage, pens, cleaning supplies | 100% deductible |
| Software and subscriptions | QuickBooks, Adobe, Slack, Zoom, Canva | 100% deductible |
| Bank and merchant fees | Credit card processing, bank account fees | 100% deductible |
| Rent (office/retail space) | Monthly lease payments | 100% deductible |
| Utilities (business location) | Electric, water, gas, internet, phone | 100% deductible |
| Business travel | Flights, hotels, rental cars for business trips | 100% deductible |
| Education and training | Courses, conferences, books, certifications | Must relate to current business |
| Licenses and permits | Business license, professional certifications | 100% deductible |
| Shipping and postage | Mailing products, shipping supplies | 100% deductible |
| Repairs and maintenance | Equipment, vehicle, office repairs | 100% deductible |
| Contract labor | Freelancers, independent contractors (1099) | 100% deductible |
Meals and Entertainment
What’s Deductible in 2026
| Expense | Deductible? | Percentage |
|---|---|---|
| Business meals with clients/prospects | Yes | 50% |
| Meals while traveling for business | Yes | 50% |
| Office snacks and coffee for employees | Yes | 50% |
| Team meals (on-site, not entertainment) | Yes | 50% |
| Holiday party for all employees | Yes | 100% |
| Company picnic/outing (all employees invited) | Yes | 100% |
| Entertainment (sporting events, concerts) | No | 0% (not deductible since 2018) |
| Golf with clients | No (entertainment) | 0% |
| Meals at entertainment events (separately stated) | Yes | 50% |
Retirement Contributions
Retirement Plan Deduction Limits (2026)
| Plan Type | Max Contribution | Best For |
|---|---|---|
| SEP IRA | 25% of net self-employment income (up to $70,000 est.) | Solo business owners wanting simplicity |
| Solo 401(k) | $23,500 employee + 25% employer (up to $70,000 est. total) | Solo owners wanting maximum contributions |
| SIMPLE IRA | $16,500 employee + 3% match | Small businesses with a few employees |
| Traditional or Roth IRA | $7,000 | Additional savings on top of other plans |
Tax Savings from Retirement Contributions
| Contribution | Tax Bracket | Tax Savings |
|---|---|---|
| $7,000 (IRA) | 22% | $1,540 |
| $23,500 (Solo 401k employee) | 24% | $5,640 |
| $50,000 (Solo 401k total) | 32% | $16,000 |
| $70,000 (SEP IRA or Solo 401k max) | 35% | $24,500 |
Health Insurance Deduction
Self-Employed Health Insurance
| Coverage Type | Average Annual Cost | Tax Deduction (24% bracket) |
|---|---|---|
| Individual plan | $7,000-$10,000 | $1,680-$2,400 |
| Family plan | $18,000-$25,000 | $4,320-$6,000 |
| HSA contribution (individual) | $4,300 | $1,032 |
| HSA contribution (family) | $8,550 | $2,052 |
| Dental/vision premiums | $500-$2,000 | $120-$480 |
| Total possible health deduction | $25,000-$35,550 | $6,000-$8,532 |
Self-employed individuals can deduct 100% of health insurance premiums as an adjustment to income (not an itemized deduction)
Interest and Loan Costs
Deductible Business Interest
| Type of Interest | Deductible? | Notes |
|---|---|---|
| Business loan interest | Yes, 100% | SBA loans, term loans, lines of credit |
| Business credit card interest | Yes, 100% | Only the business portion |
| Mortgage on business property | Yes, 100% | Commercial real estate |
| Vehicle loan interest (business use) | Yes, business % | Must use actual expense method (not mileage) |
| Student loan interest | Separate deduction | Up to $2,500 personal deduction; not a business deduction |
| Personal credit card for business | Yes, business % | Only the portion used for business expenses |
Startup Cost Deductions
First-Year Deductions for New Businesses
| Cost Category | Year-One Deduction | Remaining Costs |
|---|---|---|
| Startup costs (market research, advertising, training) | Up to $5,000 | Amortize excess over 15 years |
| Organizational costs (legal fees, state filing, permits) | Up to $5,000 | Amortize excess over 15 years |
| Total first-year deduction | Up to $10,000 |
The $5,000 deduction phases out dollar-for-dollar once total startup costs exceed $50,000
Tax Deduction Summary by Category
Estimated Annual Savings for a Solo Business Owner
Scenario: Sole proprietor, $100,000 net income, 24% marginal rate, home office
| Deduction | Annual Amount | Tax Savings (24%) |
|---|---|---|
| Home office (simplified, 300 sq ft) | $1,500 | $360 |
| Vehicle (10,000 business miles) | $7,000 | $1,680 |
| Health insurance (individual + HSA) | $11,300 | $2,712 |
| Retirement (Solo 401k) | $23,500 | $5,640 |
| Self-employment tax deduction (50%) | ~$7,065 | $1,696 |
| Software subscriptions | $2,400 | $576 |
| Professional services (CPA, legal) | $3,000 | $720 |
| Business meals (50%) | $1,200 | $288 |
| Education/training | $1,500 | $360 |
| Advertising | $3,000 | $720 |
| Equipment (Section 179) | $2,500 | $600 |
| Other operating expenses | $3,000 | $720 |
| Total estimated deductions | $66,965 | $16,072 |
Record-Keeping Requirements
IRS Documentation Standards
| Expense Type | Required Records | Retention Period |
|---|---|---|
| Income | Invoices, bank deposits, 1099s | 3-7 years |
| Expenses under $75 | Bank/credit card statement | 3 years |
| Expenses over $75 | Original receipt with details | 3 years |
| Vehicle (mileage) | Mileage log with date, destination, purpose | 3 years |
| Meals | Receipt + notes (who, business purpose) | 3 years |
| Home office | Floor plan, utility bills, mortgage/rent records | 3 years |
| Equipment/depreciation | Purchase records, depreciation schedules | Life of asset + 3 years |
| Travel | Receipts, itinerary, business purpose documentation | 3 years |
| Employee records | W-4s, payroll records, benefits | 4 years after tax due/paid |