Small Business Tax Deductions: The Complete Checklist (2026)

Every dollar you legitimately deduct is a dollar of profit you don’t pay tax on. Yet most small business owners leave money on the table every year — not through anything shady, but simply because they don’t know what qualifies or their records are too messy to prove it.

This is a complete, plain-English checklist of the tax deductions US small businesses most commonly qualify for. Use it as a year-round reference so nothing slips through the cracks at tax time.

The golden rule of business deductions

To be deductible, the IRS requires an expense to be “ordinary and necessary” for your business — ordinary meaning common in your industry, necessary meaning helpful and appropriate. If an expense is part personal, part business (like your phone), you can only deduct the business-use percentage. And you need a record to back it up. That’s it — that’s the whole framework.

The complete small business deduction checklist

Home & workspace

• Home office — if you use part of your home regularly and exclusively for business. You can use the simplified method (a set rate per square foot) or the actual-expense method.
• Rent on office, studio, or retail space.
• Utilities — electricity, water, gas (business portion or business location).
• Phone & internet — the business-use percentage.

Vehicle & travel

• Business mileage — deduct using the IRS standard mileage rate (set annually) or actual vehicle costs. Track your miles.
• Business travel — flights, hotels, rental cars, and transportation for overnight business trips.
• Business meals — generally 50% deductible when there’s a business purpose. (Note: most entertainment is no longer deductible.)

People you pay

• Employee wages & salaries, plus the employer share of payroll taxes.
• Contractor payments — amounts paid to freelancers and 1099 contractors.
• Employee benefits — health insurance, retirement contributions, and more.

Running the business

• Software & subscriptions — QuickBooks/Xero, your CRM, design tools, hosting, SaaS apps.
• Office supplies & small equipment.
• Advertising & marketing — ads, website, branding, content, email tools.
• Professional services — legal, accounting, and bookkeeping fees.
• Business insurance — liability, professional, property, etc.
• Bank & merchant fees — Stripe/PayPal fees, monthly bank charges, interest on business loans and credit cards.
• Dues, licenses & permits — professional memberships, business licenses, and regulatory fees.
• Education & training — courses, books, and conferences that maintain or improve your business skills.

Bigger-ticket items

• Equipment & depreciation — computers, machinery, furniture. Under current rules you can often expense these immediately via Section 179 or bonus depreciation rather than depreciating over years. (See what changed in our 2026 small business tax changes guide.)
• Startup costs — many expenses from before you opened can be deducted or amortized.
• Retirement contributions — a SEP-IRA or Solo 401(k) can be a major deduction for owners.
• Self-employed health insurance — often deductible for owners who qualify.

Commonly missed deductions

These are the ones owners forget most often:

• Merchant processing and payment-app fees (they add up fast).
• A portion of your cell phone and home internet.
• Business use of your personal vehicle for errands, client visits, and bank runs.
• Bookkeeping, tax prep, and software subscriptions.
• Bank interest and loan interest.
• Continuing education and industry memberships.

What you usually can’t deduct

• Purely personal expenses.
• Your daily commute to a regular workplace.
• Everyday clothing (unless it’s a required uniform or protective gear).
• Fines and penalties.
• Most client entertainment.

The part that actually protects your deductions

Here’s the uncomfortable truth: a deduction you can’t prove is a deduction you can lose in an audit. The IRS doesn’t accept “I’m pretty sure I spent that.” You need clean, categorized records and receipts.

That’s exactly why consistent bookkeeping pays for itself — it turns “I think I can deduct that” into a documented, defensible number. When your books are clean, tax time is just a report, not a shoebox scramble. (Curious what that costs? Here’s how much a bookkeeper costs.)

Frequently asked questions

Can I deduct expenses if my business isn’t profitable yet?

Often yes — legitimate business expenses are still deductible, and startup costs may be deductible or amortized once you’re up and running.

Do I need receipts for everything?

Keep documentation for your expenses, especially larger ones. Bank and card statements plus digital receipts, organized in your books, are your best defense.

Is a home office deduction an audit risk?

Not if you qualify (regular and exclusive business use) and keep records. It’s a legitimate, common deduction — just don’t stretch the “exclusive” part.

This article is general information for US small business owners, not tax advice. Deduction rules and limits change and depend on your situation — please confirm with a qualified tax professional (or ask us) before filing.