Small business tax deductions 2026 can help eligible owners reduce taxable income by claiming qualifying business expenses. Every dollar your business spends to earn revenue has the potential to lower your tax bill. Yet each year, thousands of small business owners overpay the IRS simply because they don’t know which expenses qualify, or because their records are too messy to back up a claim.

2026 is a particularly good year to get this right. The One Big Beautiful Bill Act (OBBBA), signed into law in July 2025, made several of the most valuable small business tax breaks permanent and expanded others. Equipment write-offs are bigger, the pass-through deduction is no longer scheduled to expire, and retirement contribution limits have risen again.

This guide to small business tax deductions 2026 walks through the deductions that matter most for sole proprietors, freelancers, LLC owners, partnerships, and S corporations in the United States, with updated 2026 figures and practical tips for claiming each one.

Note: This article is general information, not tax advice. Tax rules depend on your entity type, state, and circumstances. Confirm figures with a CPA or enrolled agent before filing.

The Golden Rule: “Ordinary and Necessary”

Before diving into specific deductions, understand the test the IRS applies to every business expense. Under Section 162 of the Internal Revenue Code, an expense is deductible if it is both:

Ordinary – common and accepted in your industry, and
Necessary – helpful and appropriate for your business (it doesn’t have to be indispensable).

A graphic designer buying a high-end monitor passes the test easily. The same designer buying a jet ski generally does not. Keep this rule in mind, and you’ll be able to judge most expenses that aren’t specifically listed below.

1. The Qualified Business Income (QBI) Deduction

If you run a pass-through business — a sole proprietorship, partnership, LLC, or S corporation — the QBI deduction under Section 199A may be the single largest tax break available to you. It lets eligible owners deduct up to 20% of their qualified business income.

This deduction was originally set to expire after 2025. The OBBBA made it permanent and added two important improvements starting in 2026:

Wider phase-in ranges. For 2026, the income range over which limits phase in is roughly $201,750 to $276,750 for single filers, and double that for married couples filing jointly. More owners — especially those in service businesses like consulting, law, and healthcare — will now qualify for at least a partial deduction.
A $400 minimum deduction for taxpayers with at least $1,000 of QBI from an active business in which they materially participate.

Tip: If your taxable income is close to the threshold, increasing retirement contributions (see below) can push you under it and preserve your full QBI deduction.

2. Section 179 Expensing and 100% Bonus Depreciation

Normally, when you buy equipment, you deduct its cost gradually over several years through depreciation. Two provisions let you skip the wait and write off the full cost in the year you put the asset into service.

Section 179

For 2026, the Section 179 deduction limit is $2,560,000, with the phase-out beginning once total qualifying purchases exceed $4,090,000. That’s more than double the limits from just a few years ago. Qualifying property includes:

Machinery and manufacturing equipment
Computers, servers, and off-the-shelf software
Office furniture and fixtures
Business vehicles (with special limits — heavy SUVs are capped at $32,000 under Section 179)
Certain improvements to nonresidential buildings, such as roofs, HVAC systems, and security systems

One catch: Section 179 can’t create a loss. Your deduction is limited to your business’s taxable income for the year.

Bonus Depreciation

The OBBBA permanently restored 100% bonus depreciation for qualifying property acquired after January 19, 2025. Unlike Section 179, bonus depreciation has no dollar cap and can create a net operating loss, which you may be able to carry forward.

Many businesses use both together: apply Section 179 first, up to their income limit, and let bonus depreciation absorb the rest.

Tip: Equipment purchased and placed in service in the last quarter of the year still qualifies for a full-year write-off. If you were planning to buy a new laptop, truck, or machine early next year, buying it before December 31 could pull the deduction into 2026.

Watch out: Not every state follows federal bonus depreciation rules. You may need to add some of the deduction back on your state return.

3. Retirement Plan Contributions

Contributing to a retirement plan is one of the few deductions that reduces your taxes and builds your personal wealth at the same time. 2026 limits are higher across the board:

Plan 2026 Contribution Limit
SEP IRA Up to $72,000 (or 25% of compensation, whichever is less)
Solo 401(k) – employee deferral $24,500
Solo 401(k) – total (employee + employer) $72,000
Solo 401(k) catch-up (age 50+) Additional $8,000
Solo 401(k) enhanced catch-up (age 60–63) Additional $11,250
Traditional IRA $7,500

SEP IRAs are simple to set up and you can contribute until your tax filing deadline, including extensions. Solo 401(k)s usually allow larger contributions at lower income levels because you can contribute as both “employee” and “employer,” but the plan generally needs to be established by December 31.

If you have employees, contributions you make on their behalf to a qualified plan are deductible too — and you may also qualify for tax credits for starting a new plan.

4. Vehicle Expenses

If you use a car, van, or truck for business, you can deduct the business portion of its cost using one of two methods.

Standard Mileage Rate

The IRS set the 2026 business rate at 72.5 cents per mile from January 1, then raised it mid-year to 76 cents per mile for driving on or after July 1, 2026. Simply multiply your business miles by the applicable rate. Parking fees and tolls are deductible on top of that.

Actual Expense Method

Alternatively, you can track real costs — fuel, insurance, repairs, registration, lease payments, and depreciation — and deduct the business-use percentage. This often works better for expensive vehicles or those driven primarily for work.

Important rules:

To use the standard mileage rate on a car you own, you must choose it in the first year the car is used for business.
For a leased car, if you choose the standard rate you must use it for the entire lease.
Commuting from home to a regular workplace is never deductible.

Tip: A mileage-tracking app that logs the date, distance, and purpose of each trip is the easiest way to survive an audit. Reconstructing a year of mileage from memory rarely holds up.

5. Home Office Deduction

If you regularly and exclusively use part of your home for business, you can deduct a portion of your housing costs. The space must be your principal place of business, or a place where you regularly meet clients. A spare bedroom used only as an office qualifies; a kitchen table you also eat at does not.

You have two calculation options:

Simplified method: $5 per square foot, up to 300 square feet (a maximum deduction of $1,500). No depreciation tracking, minimal paperwork.
Regular method: Deduct the office’s percentage of actual home expenses — mortgage interest or rent, utilities, insurance, repairs, and depreciation. More work, but often a larger deduction.

Note that W-2 employees working from home cannot claim this deduction under current federal law. It’s available to the self-employed and business owners.

6. Health Insurance Premiums

Self-employed individuals can generally deduct 100% of health, dental, and long-term care insurance premiums paid for themselves, their spouse, and dependents. This is an “above-the-line” deduction, meaning you get it even if you don’t itemize.

Two conditions apply: you must have net self-employment profit, and you can’t be eligible for an employer-subsidized plan (including through a spouse’s job) for the months you claim.

S corporation owners holding more than 2% of shares can also take this deduction, but the premiums must be reported on their W-2 first.

If you’re enrolled in a high-deductible health plan, contributions to a Health Savings Account are deductible as well — up to $4,400 for individual coverage and $8,750 for family coverage in 2026.

7. Business Meals

Meals with clients, customers, or business associates are 50% deductible, as long as:

The meal isn’t lavish or extravagant,
You (or an employee) are present, and
There’s a genuine business purpose.

Meals while traveling overnight for business also qualify at 50%. Some meals are 100% deductible, such as food provided at a company-wide holiday party or picnic open to all employees.

Entertainment — concert tickets, sporting events, golf outings — is not deductible, even with a client present. If you buy food at an entertainment event, it can be deductible only if it’s billed separately.

Tip: Write the name of the person you met and the business topic on each receipt. Without that context, a restaurant receipt proves nothing.

8. Business Travel

When you travel away from your tax home overnight primarily for business, a wide range of costs become deductible:

Airfare, train, and bus tickets
Hotels and short-term rentals
Rental cars, rideshares, and taxis
Baggage fees, laundry, and business calls
Meals (at 50%)

If you combine business with a vacation, only the business days and costs related to them count. For international trips, special allocation rules apply when the trip runs longer than a week.

9. Employee Wages and Benefits

Salaries, wages, bonuses, and commissions paid to employees are fully deductible, along with the employer’s share of payroll taxes. So are many benefits, including:

Group health insurance
Retirement plan matches
Education assistance (up to $5,250 per employee per year tax-free)
Workers’ compensation insurance

Hiring family: Paying your children for legitimate work in your business can shift income to a lower tax bracket. If you’re a sole proprietor, wages paid to your children under 18 are also generally exempt from Social Security and Medicare taxes. The work must be real and the pay reasonable for the job.

Payments to independent contractors are deductible too — just be sure to issue the required 1099 forms.

10. Startup and Organizational Costs

Expenses incurred before your business officially opens — market research, advertising for the launch, training, and legal fees to form an LLC or corporation — aren’t ordinary business expenses because there wasn’t a business yet. But they’re not lost.

You can deduct up to $5,000 in startup costs and $5,000 in organizational costs in your first year of operation. Each $5,000 allowance phases out dollar-for-dollar once those costs exceed $50,000. Any remaining amount is amortized over 15 years.

11. Everyday Operating Expenses

These smaller deductions are easy to overlook, but together they add up quickly:

Rent for office, retail, or warehouse space
Utilities, internet, and the business share of your phone bill
Software and subscriptions — accounting, CRM, design tools, cloud storage
Advertising and marketing — online ads, website hosting, business cards, sponsorships
Professional fees — accountants, attorneys, bookkeepers, consultants
Business insurance — general liability, professional liability, property, cyber
Office supplies — paper, printer ink, postage, shipping
Bank and payment processing fees, including card processing charges
Interest on business loans and credit cards, subject to limits for larger businesses
Education and training that maintains or improves skills in your current business
Professional memberships and trade association dues
Bad debts — for accrual-basis businesses, invoices that become uncollectible

12. Self-Employment Tax Deduction

Self-employed people pay both halves of Social Security and Medicare taxes — 15.3% on most net earnings. To ease that burden, you can deduct half of your self-employment tax as an adjustment to income. It doesn’t reduce the self-employment tax itself, but it lowers your income tax. Tax software usually calculates this automatically, but it’s worth confirming it appears on your return.

13. Research and Development Costs

For years, businesses had to spread domestic research and experimental costs over five years. The OBBBA restored immediate expensing of domestic R&D costs beginning in 2025. If your business develops software, improves products, or tests new processes, those costs may now be deducted in the year you incur them. Smaller businesses may also be eligible for the separate R&D tax credit, which reduces tax dollar-for-dollar.

How to Make Sure You Keep These Deductions

A deduction is only as good as the records that support it. Follow these habits throughout the year:

Separate business and personal finances. Use a dedicated business bank account and credit card.
Keep receipts digitally. Snap a photo of each receipt and store it in your accounting software.
Record the business purpose. Note who, what, and why for meals, travel, and vehicle use.
Reconcile monthly. Catching a missing receipt in February is far easier than in March of the following year.
Keep records for at least three years after filing, and longer for asset purchases.
Plan before year-end. October through December is the time to time equipment purchases, set up a Solo 401(k), and review whether you’re near the QBI threshold.
Final Thoughts

The 2026 tax landscape is unusually favorable for small business owners. With permanent 100% bonus depreciation, a Section 179 limit above $2.5 million, a permanent and more accessible QBI deduction, and higher retirement contribution limits, there’s real money on the table for owners who plan ahead.