Small Business Tax Deductions: A Checklist by Category

By Michael · August 13, 2026 · 10 min read

A deduction reduces the income you are taxed on, not the tax you owe: a $1,000 deduction saves you $1,000 times your marginal rate, not $1,000. If that distinction is new, how tax write-offs work covers the arithmetic — this page is the list.

Below is what most US small businesses can deduct, grouped by category, with the mistake that most often gets each one disallowed. The deductions people miss are rarely exotic; they are ordinary costs that had no paper trail by the time anyone went looking.

What makes an expense deductible?

The standard is that a cost be ordinary — normal for your line of work — and necessary, meaning helpful and appropriate for it. Necessary does not mean indispensable. Two consequences decide most real cases:

There has to be a business purpose you could explain to a stranger. Not a plausible-sounding one. An actual one.
Mixed-use costs get split. A phone, a car, a spare room: deduct the business share, and have a defensible basis for the percentage you picked.

What can a small business deduct?

Operating costs

Rent. Office, warehouse, storefront, or equipment leased from an unrelated landlord. Mistake: paying "rent" to yourself or an entity you control and treating it as arm's length.
Utilities. Electricity, gas, water, trash, internet, and phone for the business premises. Mistake: running the whole household bill through when the premises is your home — that belongs in the home office calculation instead.
Insurance. General and professional liability, commercial property, cyber, business interruption. Mistake: folding in owner health premiums, which follow separate rules that depend on entity type.
Office supplies. Paper, postage, shipping materials, cleaning supplies, small tools. Mistake: treating a long-lived purchase as a supply because it felt cheap. Above a certain cost it is equipment.
Software subscriptions. Accounting, CRM, design, hosting, domains, storage, security. Mistake: personal plans on the business card. A family streaming account does not become deductible because of which card paid for it.
Bank and merchant fees. Account and wire fees, processor percentages, interest on business credit cards. Mistake: booking gross sales and never recording the processor's cut. Deposits arrive net, so a fee that is never entered is never deducted.

People you pay

Wages and salaries. Employee compensation, including bonuses and commissions. Mistake: deducting owner draws — in a sole proprietorship or partnership, money you take out is not a wage.
Contractor payments. Amounts paid to genuine independent contractors. Mistake: collecting the W-9 in January rather than before the first payment, and treating someone as a contractor who is functionally an employee.
Payroll taxes. The employer's share of Social Security and Medicare, plus unemployment. Mistake: also deducting the employee's withheld share, which is part of the gross wage you already deducted.
Benefits. Health, dental, vision, and life coverage provided to employees. Mistake: assuming owner coverage works the same way. It usually does not.
Retirement contributions. Employer contributions to a SEP-IRA, SIMPLE IRA, or solo 401(k). Mistake: budgeting off a limit you remember from a prior year — every one of them is adjusted annually. Some plans must also be established before year end even if they are funded later.

Professional services

Legal fees. Contracts, employment advice, collections, compliance. Mistake: expensing fees incurred to acquire an asset or form the business; those attach to the asset or to startup costs. Personal legal matters never qualify.
Accounting and tax fees. Bookkeeping, payroll, return preparation, tax planning. Mistake: deducting the full fee when part of the engagement was your personal return — ask for a split invoice.
Consulting. Industry consultants, IT advisers, HR support, appraisals. Mistake: no engagement letter and no deliverable, which makes the purpose hard to show later.

Marketing

Advertising. Paid search, social, print, radio, sponsorships, trade shows, directory listings. Mistake: sponsoring something you personally benefit from — your child's team, a hobby event — and deducting all of it.
Website. Hosting, domains, plugins, and maintenance are current expenses. Mistake: expensing a substantial ground-up build in year one. A significant new site can be a capital asset.
Design and content. Photography, copywriting, video, and graphics produced for marketing use. Mistake: assuming long-lived brand assets, like a full identity system, are automatically immediate expenses.

Travel and vehicle

Vehicle costs run on one of two methods, and choosing between them is a decision, not a formality.

Standard mileage. Business miles times a per-mile rate the IRS sets each year. Simpler, usually better for high mileage in an inexpensive vehicle. Mistake: reconstructing the log in April, and reusing last year's rate instead of looking up the current one.
Actual expenses. Gas, insurance, repairs, registration, lease or depreciation, multiplied by your business-use percentage. Usually better for an expensive vehicle. Mistake: not realizing the choice can be sticky — starting with actual expenses and depreciation can restrict your ability to switch to mileage for that vehicle later.
Business travel. Airfare, trains, rental cars, and ground transport for trips away from your tax home that are primarily for business. Mistake: deducting a vacation with one client meeting attached. Personal days are not deductible even on a qualifying trip.
Lodging. Hotels and short-term rentals on qualifying trips. Mistake: including a spouse's share when they came along for the trip, not the business.

Meals

Business meals qualify when there is a real business purpose and you or an employee are present — a client, prospect, vendor, or team meal. Most are subject to a percentage limit rather than being fully deductible, and that percentage has been changed by legislation more than once in recent years. Confirm the rate that applies to the year you are filing.

Mistake: keeping the receipt but recording nothing about who was there or why, which is what actually gets a meal disallowed. And assuming entertainment still works the way it once did — entertainment is generally not deductible, so tickets, golf, and outings do not qualify however much business was discussed.

Home office

Two tests come first: the space must be used regularly and exclusively for business, and it must be your principal place of business or somewhere you regularly meet clients. Exclusively is the strict word — a desk in the corner of a guest room can qualify; a dining table that hosts dinner cannot.

Then two methods. Simplified is a flat rate per square foot up to a capped area; both figures are set by the IRS and can change, so check the current ones. Actual applies your business percentage of the home — usually by square footage — to rent or mortgage interest, insurance, utilities, and repairs, plus depreciation if you own. Actual usually deducts more; simplified takes ten minutes and creates fewer complications when you sell.

Mistake: claiming the space and also deducting the same household utilities separately as an operating cost. Pick one route per dollar.

Equipment

Equipment with a useful life beyond a year is a capital purchase, and the default treatment is depreciation — deducting the cost across several years according to the asset class. Two provisions let you accelerate that: an immediate expensing election (Section 179) and bonus depreciation. Both carry annual dollar caps, phase-outs, and eligibility rules that have moved repeatedly, so look the current numbers up rather than recalling them.

Mistake: assuming faster is better. Deducting an entire asset in a low-income year spends the deduction against a low marginal rate, and expensed assets can create recapture income if you sell them early. This is the item on this list most worth a conversation before you buy.

Education and training

Courses, conferences, certifications, publications, and coaching qualify when they maintain or improve skills for the business you are already in. Mistake: deducting education that qualifies you for a new trade or profession, which does not qualify even when it is obviously useful. In some fields that line is genuinely gray and worth asking about rather than assuming.

Interest on business debt

Interest on loans, lines of credit, and business credit cards used for business purposes is deductible. Mistake: mixing in a personal loan, or drawing on a business line to fund something personal. Interest follows what the money was actually used for, not whose name is on the account. Larger businesses can also hit annual limits on how much interest is deductible.

Startup costs

Costs incurred before the business opened — market research, initial legal and accounting work, supplier scouting, employee training — are treated differently from everything above. A limited amount can generally be deducted in the first year, and the remainder is amortized in equal parts over a fixed period of years. Both the amount and the period are set by statute, so verify them for your filing year; organizational costs such as incorporation run on a parallel but separate track.

Mistake: skipping them because they happened before the business existed. They are deductible — just not all at once.

What do people wrongly think is deductible?

Commuting. Home to your regular workplace is personal, however far it is, though travel between business locations during the day does qualify.
Most clothing. Deductible only if required for work and unsuitable for everyday wear — uniforms, branded workwear, safety gear. A suit bought for client meetings does not qualify.
Your whole phone bill. Only the business-use share of a personal phone. A dedicated business line is fully deductible.
Entertainment. Tickets, golf, box seats, and outings are generally not deductible.
Political contributions and most lobbying. Not deductible. Neither are fines and penalties paid to a government body, including traffic tickets incurred on business time.
Anything without a business purpose. Running a personal cost through the business account does not convert it — obvious, and still the most common problem in small business books.

What records do you actually need, and for how long?

A bank statement alone is usually not enough. It proves money moved and to whom, but a deduction has to establish the amount, the date, and the business purpose — and the purpose is exactly what a statement line lacks. "$212, Restaurant, March 4" is a record of nothing.

Keep:

Receipts or invoices showing what was bought, not just what was charged.
The business purpose, noted at the time. For meals and travel, who was there and why. A note written when you categorize the transaction is enough; a reconstruction eleven months later is much weaker.
A contemporaneous mileage log if you claim vehicle costs: date, destination, purpose, miles.
Payroll and contractor records, including W-9s and the 1099s you filed.
Asset records for anything depreciated: cost, date placed in service, and eventual disposal.

How long: at least three years from the date you filed is the general rule, that being the ordinary window to examine a return. Substantially understated income extends it to six, and there is no time limit on an unfiled or fraudulent return. Property records should survive as long as you own the asset plus the normal period after you dispose of it. Because the windows differ by record type, most firms simply advise keeping business records for seven years.

Does your entity type change what you can deduct?

Yes, more than most owners expect. Owner health insurance, retirement plan options, how you are paid, whether what you take out is deductible, and the payroll tax treatment of profits all shift across sole proprietorships, partnerships, LLCs, and S corporations. The list above is the common core; the edges move with the structure. If you are weighing a change, LLC vs S corp covers where the differences show up.

What to do next

Run one pass through the last twelve months of bank and card activity against the categories above. The goal is not something clever — it is the ordinary costs that were coded to "Miscellaneous."
Fix the record-keeping before the deductions. A purpose note written when you categorize a transaction takes seconds and is worth more later than any amount of year-end reconstruction.
Take the gray items to a professional — the vehicle method, equipment timing, the home office, anything entity-specific. An hour of advice routinely pays for itself, and getting these wrong is expensive in both directions.

If that last step is where you are: 6,395 of the 13,986 firms in our directory list tax preparation, and 2,849 list tax planning as a separate service. The smaller number is the relevant one — preparation records what already happened, planning is what changes it. Browse tax accountants near you or small business accountants near you; every profile links straight to the firm's own website.

Method and caveats

Figures are from the AccountingNearYou dataset as of 13 August 2026: 13,986 US accounting firms profiled from their own public websites. A firm counts as offering a service if it names that service on the pages we crawled, so these are counts of what firms advertise, not of everything they will agree to do. Firms that do planning without describing it separately from preparation are not in the 2,849.

No rate, cap, or percentage appears above, and that is deliberate: mileage rates, expensing caps, retirement limits, and the meal percentage are set annually or by legislation, and an article that pinned them down would be wrong within a year. Confirm any current figure against IRS guidance for your filing year, or ask your preparer. This is general information, not tax advice for your situation.