Small Business Tax Deductions Checklist for 2026

A business tax deduction is any expense you subtract from revenue before you calculate the tax you owe. The rule behind almost all of them is short: to be deductible, an expense must be "ordinary and necessary" for your trade or business (Internal Revenue Code Section 162). Ordinary means common and accepted in your line of work. Necessary means helpful and appropriate, not that you literally could not operate without it. An expense can also be only partly deductible when it has a personal side, which is why meals, a home office, and a personal vehicle used for work each get their own rules below.

Two practical points before the list. First, most items here are business expenses that reduce the profit on your Schedule C, partnership return, or S corporation return. A few, like the self-employed health insurance deduction and half of self-employment tax, are "above-the-line" adjustments you take on your personal Form 1040 even if you never itemize. Second, a deduction is only as good as your records. The IRS can disallow any expense you cannot substantiate, so keep receipts, invoices, mileage logs, and bank and card statements, and keep business and personal accounts separate. Software that pulls your bank feed and categorizes transactions as they post, BooksGPT included, exists mainly to make that substantiation automatic.

In this article

Your workspace
Your vehicle and travel
The people you pay
Equipment, supplies, and technology
Financial and professional services
Insurance, retirement, and owner-level deductions
Marketing and advertising
Keeping records that survive an audit

Your workspace

Home office (simplified or regular method). If you use part of your home regularly and exclusively for business, you can deduct it. The simplified method is $5 per square foot up to 300 square feet, a maximum of $1,500 per year, with no depreciation to track. The regular method deducts the business-use percentage of actual costs (rent or mortgage interest, utilities, insurance, repairs) and can be larger for a bigger space. Common mistake: the "exclusive use" test is strict. A desk in the corner of a room you also use personally does not qualify, and neither does the kitchen table.

Rent and utilities. Rent on an office, studio, storefront, or warehouse is fully deductible, along with the utilities that keep it running. If you work from home, you do not deduct rent twice: those costs flow through the home office calculation instead.

Phone and internet. The business-use share of your cell phone and internet is deductible. If a line serves both business and personal use, deduct only the business percentage and be ready to explain how you arrived at it. A dedicated business line is 100% deductible and far easier to defend.

Your vehicle and travel

Mileage or actual expenses. For a car or truck used in your business you pick one of two methods. The standard mileage rate for 2026 is 72.5 cents per mile for business driving, up from 70 cents in 2025. The actual-expense method instead deducts the business-use percentage of gas, insurance, repairs, and depreciation. Commuting from home to your regular workplace never counts. Common mistake: switching methods carelessly. If you want the option to use standard mileage on a vehicle, you generally must use it in the first year the car is placed in service.

Business travel. Airfare, lodging, rental cars, baggage fees, and other costs of traveling away from your tax home for business are fully deductible. The trip must be primarily for business.

Business meals. You can deduct 50% of a business meal when you or an employee is present and the meal is not lavish. Client meals and meals while traveling generally qualify at that 50% level. Entertainment such as sports tickets, golf, and concerts is not deductible at all, even with a clear business purpose. New for 2026: two categories that used to be 50% deductible are now fully nondeductible, the meals you provide employees for your own convenience on the business premises, and food from an employer-operated cafeteria or eating facility. Common mistake: still claiming 100% of restaurant meals, which was a temporary 2021 to 2022 rule that has expired.

Parking and tolls. Business parking and tolls are deductible on top of mileage. Parking tickets and other fines are not.

The people you pay

Employee wages and payroll taxes. Salaries, hourly wages, bonuses, and commissions you pay employees are deductible, as is the employer share of Social Security and Medicare tax, federal and state unemployment tax, and most taxable benefits. Owner "draws" from a sole proprietorship or partnership are not wages and are not deductible.

Independent contractors. Payments to freelancers and contractors are deductible. If you pay a contractor $600 or more in a year, you generally must issue Form 1099-NEC. Common mistake: no W-9 on file. Collect it before you pay, or you can face backup withholding and penalties.

Employee benefits. Health coverage, education assistance, and employer contributions to employee retirement plans are generally deductible business expenses. Retirement plans for you as the owner are treated differently and appear in the retirement section below.

Equipment, supplies, and technology

Section 179 expensing. Instead of depreciating equipment over several years, Section 179 lets you deduct the full cost of qualifying property in the year you place it in service. For 2026 the maximum is $2,560,000, and it phases out dollar for dollar once total qualifying purchases exceed $4,090,000 (Revenue Procedure 2025-32). Heavy SUVs carry a separate $32,000 cap.

Bonus depreciation. The 2025 tax law restored 100% bonus depreciation permanently for qualifying new or used property acquired after January 19, 2025, so many purchases can be written off entirely in year one. Section 179 is generally applied first, then bonus depreciation on the remainder. Common mistake: expensing something that should be capitalized, or the reverse. Big-ticket assets and business vehicles have their own rules, so confirm before you file.

Office supplies and small equipment. Paper, postage, pens, and low-cost tools are deductible in the year you buy them.

Software and subscriptions. Accounting, design, and other business software subscriptions are deductible, along with domain and hosting fees. This is one of the most commonly under-claimed categories, because the charges are small and scattered across the year.

Financial and professional services

Bank, merchant, and interest costs. Business bank fees, payment-processor fees (Stripe, Square, PayPal), and credit card fees are deductible. Interest on a business loan or business credit card is deductible; interest on personal debt is not, one more reason to keep the accounts separate.

Legal, accounting, and bookkeeping fees. Fees paid to attorneys, accountants, bookkeepers, and tax preparers for business work are fully deductible. The cost of the software or service that keeps your books is deductible too.

Startup and organizational costs. You can deduct up to $5,000 of startup costs and up to $5,000 of organizational costs in your first year of business, with each $5,000 amount reduced dollar for dollar once that category exceeds $50,000. Anything above the first-year deduction is amortized over 180 months (15 years). Common mistake: these are pre-opening costs such as market research, training, and legal setup, and they belong to the year the business actually begins operating.

Education and professional development. Courses, certifications, books, and conferences that maintain or improve skills for your current business are deductible. Education that qualifies you for a new trade is not.

Insurance, retirement, and owner-level deductions

Business insurance. Premiums for general liability, professional liability, commercial property, cyber, and workers' compensation are deductible business expenses.

Self-employed health insurance. If you are self-employed and not eligible for coverage through an employer or a spouse's employer, you can deduct 100% of the premiums you pay for medical, dental, and qualifying long-term care coverage for yourself, your spouse, and your dependents. It is an above-the-line deduction on Schedule 1, capped at your net self-employment income, and it lowers income tax but not self-employment tax (Form 7206).

Half of self-employment tax. Self-employed people pay both halves of Social Security and Medicare, a 15.3% self-employment tax on 92.35% of net earnings. You deduct half of that tax as an above-the-line adjustment, which offsets the burden of covering the employer side yourself.

Owner retirement plans. Contributions to a SEP IRA or solo 401(k) are deductible and are one of the largest levers a profitable owner has. For 2026 a SEP IRA allows up to $72,000, and a solo 401(k) allows a $24,500 employee deferral (plus an $8,000 catch-up at age 50 and over, or $11,250 at ages 60 to 63) on top of the employer share, within the same $72,000 total-additions limit (IRS Notice 2025-67). Common mistake: waiting too long, since some plans must be established before year end.

Qualified business income (QBI) deduction. Owners of pass-through businesses (sole proprietorships, partnerships, S corporations, most LLCs) can deduct up to 20% of qualified business income. The 2025 tax law made this deduction permanent at 20%. Higher-income owners face phase-outs and extra limits, especially for certain service businesses, so it is worth modeling before you count on the full amount.

Marketing and advertising

Advertising and promotion. Online ads, print ads, sponsorships, printed materials, and promotional giveaways are fully deductible, as is the cost of designing and running them.

Website and content. Domain registration, hosting, website design, email marketing tools, and content or SEO services are deductible ordinary business expenses.

Branding. Logo design, business cards, signage, and business photography are deductible. Common mistake: treating a large website or branding build as a simple one-time expense when a substantial project may need to be capitalized. Ask about the scale before you book it.

Keeping records that survive an audit

Every deduction on this list depends on proof. For each expense, keep the receipt or invoice, the amount, the date, the vendor, and the business purpose, and hold them for at least three years after you file (longer for property you depreciate). A contemporaneous mileage log beats a reconstruction. A dedicated business bank account and card do most of the categorization work for you. The goal is simple: if the IRS ever asks, you can show that each expense was ordinary, necessary, and actually paid.

Reconcile your books monthly instead of scrambling in April. It is the single habit that turns this checklist from a list of things you might have missed into a return you can defend.

This article is general information, not tax advice. Rules and dollar limits change and depend on your situation. Confirm specifics with a qualified tax professional or the IRS before filing.

The complete small business tax deductions checklist for 2026.