For tax-year-2026 returns (filed in early 2027), this guide explains how the major small-business deductions work—eligibility, methods, and ordering—not a checkbox inventory. If you want a category-by-category list to tick against your books, use the companion 2026 deductions checklist.
Missing just $6,000 in legitimate deductions—easy to reach by overlooking mileage and software—can mean overpaying by $1,500 or more at a 25% bracket. Most of those costs are expenses you already incur; the key is knowing what qualifies and keeping records. Figures below were checked against IRS sources on 2026-09-15.
What's New for 2026: Major Tax Law Changes
The OBBBA, signed into law on July 4, 2025, brought several significant changes that affect small business tax planning:
100% Bonus Depreciation is Back—Permanently
The OBBBA permanently restored 100% bonus depreciation, making it a permanent feature of the tax code. This means you can deduct the full cost of qualifying equipment and property in the year you put it into service, rather than depreciating it over several years.
Expanded Section 179 Deduction
For 2026, the Section 179 deduction limit is $2,560,000, with a phase-out threshold of $4,090,000 (Pub. 946; Rev. Proc. 2025-32; checked 2026-09-15). That is a substantial increase from the pre-OBBBA limits of $1,250,000 and $3,130,000 respectively.
Qualified Business Income (QBI) Deduction Made Permanent
The QBI deduction, which allows eligible business owners to deduct up to 20% of qualified business income, was set to expire at the end of 2025. OBBBA made it permanent (Pub. 334; checked 2026-09-15) and introduced several improvements:
- New minimum deduction: Starting in 2026, anyone with at least $1,000 of qualified business income receives a minimum deduction of $400 (Rev. Proc. 2025-32)
- Wider phase-in ranges: The W-2/UBIA (and SSTB) phase-in range is $75,000 for single filers and $150,000 for joint filers (up from $50,000 / $100,000)
- 2026 thresholds: Phase-in begins above $201,750 (single) / $403,500 (joint); the top of the phase-in range is $276,750 / $553,500 (Rev. Proc. 2025-32; checked 2026-09-15)
Enhanced Childcare Credit for Employers
The employer-provided childcare credit jumped from 25% to 40% of eligible costs, with the maximum credit increasing to $500,000. Small businesses can claim up to 50% of eligible costs with a maximum annual credit of $600,000.
R&D Expense Immediate Deduction
The OBBBA reversed the previous requirement to amortize R&D expenses over 5 years. Businesses can now immediately expense R&D costs incurred in 2025 and later.
The Big Deductions: Where Most Tax Savings Come From
Employee Wages and Benefits
For businesses with employees, payroll costs represent one of the largest deductions. You can deduct:
- Employee salaries and wages
- Bonuses and commissions
- Paid time off
- Employer portion of payroll taxes (Social Security, Medicare, unemployment)
- Health insurance premiums paid for employees
- Retirement plan contributions made on behalf of employees
- Workers' compensation insurance
Important: You cannot deduct your own salary if you're a sole proprietor—that comes out of your business profit. However, S-corporation owners who pay themselves a reasonable salary can deduct that expense.
Home Office Deduction
If you use a dedicated space in your home exclusively and regularly for business, you can claim the home office deduction. The IRS offers two methods:
Simplified method: Claim $5 per square foot, up to 300 square feet, for a maximum deduction of $1,500 (Pub. 587; checked 2026-09-15). This method requires minimal recordkeeping.
Actual expense method: Calculate the percentage of your home used for business, then deduct that percentage of:
- Rent or mortgage interest
- Property taxes
- Utilities
- Homeowners insurance
- Repairs and maintenance
- Depreciation (for homeowners)
The actual expense method requires more documentation but often yields larger savings, especially if your home office is a significant portion of your living space.
Critical requirement: The space must be used exclusively for business. A desk in your bedroom that doubles as a vanity won't qualify.
Vehicle Expenses
For 2026, the IRS business standard mileage rate is 72.5 cents per mile for January 1–June 30 and 76 cents per mile for July 1–December 31 (standard mileage rates; Notice 2026-10; checked 2026-09-15). If you drive 100 business miles weekly, that is roughly $3,860 for a full year when you split the log at June 30.
You can choose between two methods:
Standard mileage rate: Multiply business miles by the applicable 2026 rate for that half of the year. This method is simpler but requires a contemporaneous mileage log.
Actual expense method: Deduct the business-use percentage of all vehicle costs, including:
- Gas and oil
- Repairs and maintenance
- Insurance
- Registration fees
- Depreciation or lease payments
Vehicle-specific rules for Section 179: Heavy SUVs, trucks, and vans over 6,000 pounds may qualify for larger deductions, but only if business use exceeds 50% and mileage logs are properly maintained. Vehicles with GVWR over 14,000 lbs (commercial trucks, cargo vans, box trucks) may qualify for the full Section 179 deduction without passenger vehicle caps.
Section 179 and Bonus Depreciation
For equipment purchases in 2026, you have powerful deduction options:
Section 179: Allows you to deduct up to $2,560,000 of qualifying equipment in the year of purchase. The deduction phases out dollar-for-dollar once total equipment purchases exceed $4,090,000 (Pub. 946; Rev. Proc. 2025-32; checked 2026-09-15). Qualifying property includes:
- Machinery and equipment
- Office furniture and equipment
- Computers and software
- Certain vehicles
- Qualified improvement property
Bonus Depreciation: After applying Section 179, you can use 100% bonus depreciation on remaining eligible property. This applies to both new and used equipment.
Ordering rules: The IRS requires Section 179 to be applied first, then bonus depreciation, then regular MACRS depreciation. Work with a tax professional to optimize the ordering based on your income levels.
Self-Employed Health Insurance
This is one of the most frequently overlooked deductions. If you're self-employed and not eligible for coverage through an employer (including a spouse's employer), you can deduct 100% of health insurance premiums for:
- Yourself
- Your spouse
- Your dependents
- Children under age 27
This deduction is taken "above the line," meaning it reduces your adjusted gross income regardless of whether you itemize deductions.
Retirement Contributions
Tax-advantaged retirement accounts offer both current tax deductions and future tax benefits:
SEP-IRA: Contribute up to 25% of net self-employment income, up to $72,000 for 2026 (COLA limits; Notice 2025-67; checked 2026-09-15). Contributions are fully deductible.
SIMPLE IRA: Check the current employee deferral and catch-up limits on the same IRS COLA table before funding; employer matching of up to 3% of compensation remains the common design.
Solo 401(k): Combine employee elective deferrals (up to $24,500 for 2026 under Notice 2025-67) with employer contributions (up to 25% of compensation), subject to the overall defined-contribution limit of $72,000.
Retirement plan startup credit: Eligible small employers can claim a tax credit of up to $5,000 for costs of starting a SEP, SIMPLE IRA, or qualified plan.
Operating Expense Deductions
Rent and Utilities
If you rent office, retail, or warehouse space, the rent is fully deductible. You can also deduct:
- Parking lot or garage rental for business vehicles
- Utilities (electricity, gas, water, internet)
- Janitorial services
- Security services
Business Insurance
Premiums for ordinary and necessary business insurance are deductible, including:
- General liability insurance
- Professional liability (errors and omissions)
- Product liability
- Business property insurance
- Business interruption insurance
- Commercial auto insurance
- Cyber liability insurance
Professional Services
Fees paid to professionals for business purposes are deductible:
- Accountants and bookkeepers
- Attorneys
- Consultants
- Business coaches
- IT support services
Software and Subscriptions
All those monthly software fees add up—and they're all deductible when used for business:
- Accounting software
- Customer relationship management (CRM) systems
- Email marketing platforms
- Project management tools
- Cloud storage services
- Industry-specific software
A typical small business might spend $2,000 to $5,000 annually on software subscriptions—all deductible.
Internet and Phone
The business-use portion of your phone and internet bills is deductible. A $100 monthly phone bill with 60% business use equals $720 in annual deductions.
Key requirement: The phone and internet must be essential to your business operations. Keep records documenting business versus personal use.
Advertising and Marketing
Reasonable advertising and promotional expenses directly related to your business are deductible:
- Website hosting and development
- Social media advertising
- Print advertising
- Business cards and brochures
- Trade show booth fees
- Promotional items and giveaways
- SEO and content marketing services
Travel and Meal Deductions
Business Travel
Business travel expenses are deductible when the trip is primarily for business purposes:
- Transportation (airfare, train tickets, rental cars, rideshares)
- Lodging
- 50% of meal costs while traveling
- Baggage fees
- Business calls while traveling
- Tips related to these services
- Dry cleaning on extended trips
Documentation required: Keep records showing the business purpose, date, location, and amounts for each expense.
Business Meals
Business meals remain 50% deductible in 2026. Qualifying meals include:
- Meals with clients or prospects where business is discussed
- Meals with employees for business purposes
- Meals during business travel
Important: Maintain records that include who attended, the business purpose, and the amount. Lavish or extravagant expenses may not be fully deductible.
Taxes as Deductions
You can deduct certain taxes as business expenses:
- Payroll taxes: Employer portion of Social Security, Medicare, and unemployment taxes
- State and local income taxes: On business income (subject to SALT limitations on personal returns)
- Property taxes: On business property
- Sales tax: Collected and remitted to state governments
- Self-employment tax: 50% of self-employment tax is deductible
- Excise taxes: If applicable to your industry
- Business vehicle registration fees
Education and Professional Development
Investments in professional development are fully deductible:
- Industry conferences and seminars
- Online courses and certifications
- Professional books and publications
- Trade association memberships
- Professional licensing fees and continuing education
Annual professional development costs often range from $2,000 to $5,000—all potentially deductible.
Startup Costs
If you started a business in 2026, you can deduct up to $5,000 in qualifying startup costs in your first year, plus another $5,000 in organizational costs. Amounts exceeding these limits can be amortized over 15 years.
Qualifying startup costs include:
- Market research
- Pre-opening advertising
- Employee training
- Consultant fees
- Travel to secure suppliers or customers
- Legal and accounting fees for business formation
Commonly Overlooked Deductions
Don't miss these frequently forgotten deductions:
Bank and Transaction Fees
Processing fees, monthly charges, and transaction costs can total $3,000 to $5,000 annually for a small business. All deductible.
Business Interest
Interest on business loans and business credit cards is deductible. Personal credit card interest is not deductible, even if used for business purchases—so keep business and personal expenses separate.
Bad Debts
If you use the accrual method of accounting and have accounts receivable that become uncollectible, you can deduct the bad debt.
Casualty and Theft Losses
If business property is damaged or destroyed by theft, vandalism, fire, storms, or other sudden disasters, you may be able to claim a deduction for the unreimbursed loss.
Charitable Contributions (for Corporations)
C-corporations can deduct charitable contributions up to 10% of taxable income. For sole proprietors, partnerships, and S-corporations, charitable deductions pass through to personal tax returns.
Moving Expenses for Business
If you relocated your business, the moving costs for equipment and inventory are deductible.
The QBI Deduction: Don't Forget Your 20%
The Qualified Business Income deduction is one of the most valuable tax benefits for pass-through businesses (sole proprietors, partnerships, S-corporations, and certain trusts). Pub. 334 states that P.L. 119-21 (OBBBA) §70105 made the 20% QBI deduction permanent (checked 2026-09-15).
How to Calculate It
The basic calculation: Take the lesser of 20% of your qualified business income OR your taxable income minus net capital gains and dividends. For 2026, Rev. Proc. 2025-32 sets the §199A threshold at $201,750 (single) / $403,500 (joint) before the expanded phase-in range applies.
Who Qualifies
- Sole proprietors
- Partners in partnerships
- S-corporation shareholders
- Certain trust and estate beneficiaries
C-corporations and employees do not qualify.
How to Claim It
Use Form 8995 (simplified version) or Form 8995-A (for higher incomes and more complex situations). The deduction is available whether you itemize or take the standard deduction.
Best Practices for Maximizing Deductions
Keep Meticulous Records
Without documentation, you can't claim deductions—even for legitimate business expenses. Maintain:
- Receipts for all expenses
- Mileage logs for vehicle use
- Records of business purposes for meals and travel
- Contracts and invoices for professional services
Separate Business and Personal Finances
Use dedicated business bank accounts and credit cards. This simplifies recordkeeping and helps substantiate deductions in case of an audit.
Track Throughout the Year
Don't wait until tax time to organize expenses. Regular bookkeeping ensures you capture every deduction and have documentation ready when needed.
Review Expenses Quarterly
Schedule quarterly reviews of your expenses to identify deductions you might be missing and to ensure proper categorization.
Consult a Tax Professional
Tax law is complex, and the OBBBA changes for 2026 add new considerations. A qualified tax professional can help you maximize deductions while staying compliant.
Simplify Your Financial Management
Tracking every deductible expense across multiple categories can be overwhelming—especially when you're also running a business. Having a clear, organized system for your financial records makes tax time less stressful and ensures you never miss a legitimate deduction.
Beancount.io provides plain-text accounting that gives you complete transparency and control over your financial data. With version-controlled records and AI-ready data formats, you can easily track expenses by category, generate reports for your tax preparer, and maintain the documentation the IRS requires—without being locked into proprietary software. Get started for free and take control of your business finances.
