What makes a business expense tax deductible?

An expense is deductible if it is "ordinary and necessary" for your business, ordinary meaning common in your industry, and necessary meaning helpful and appropriate. It also has to be a genuine business cost (not personal) and you must be able to document it with a receipt or record.

Can I deduct my home office and cell phone?

Yes, the business-use portion. For a home office used regularly and exclusively for business, the simplified method allows $5 per square foot up to 300 square feet ($1,500/year). For a phone or internet used for both personal and business, you can only deduct the business-use percentage.

Are business meals fully deductible in 2026?

No. Business meals are generally 50% deductible, and you need a record of the business purpose and who attended. Entertainment expenses like concert or sporting event tickets are not deductible at all, even when clients are present.

Does a bookkeeper file my taxes or just track expenses?

A bookkeeper tracks and categorizes your expenses and keeps your books accurate and tax-ready, but does not file your return. Filing is handled by a CPA, enrolled agent, or tax preparer. Clean books from a bookkeeper like IBRA make that filing faster, cheaper, and far less likely to miss a deduction.

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Taxes

What Business Expenses Are Tax Deductible for a Small Business?

Almost any ordinary and necessary cost of running your business is deductible, from rent and software to mileage and a portion of your home office. Here is the full list, the 2026 limits, and the rules that decide what counts.

IBRA Bookkeepers · Updated June 2026

A business expense is tax deductible if it is ordinary and necessary for running your business, meaning it is common in your industry and helpful to your operations. That covers most of what you spend to earn revenue: rent, payroll, supplies, software, insurance, marketing, professional fees, business mileage, and a portion of your home office and phone if you use them for work. You subtract these costs from your revenue, so you only pay income tax on your actual profit.

The IRS standard, set out in Section 162 of the tax code, is the phrase "ordinary and necessary." Ordinary means the expense is normal for your line of work; necessary means it is appropriate and helpful, it does not have to be indispensable. If a cost passes both tests and is directly tied to your business (not personal), it is almost certainly deductible. The catch is in the details: some expenses are only partly deductible, some must be depreciated over years instead of deducted all at once, and personal costs never qualify.

Quick rule of thumb: if you spent the money to make money, and you can prove it with a receipt or record, it is probably deductible. If you would have spent it anyway as a private individual, it is probably not.

The most common deductible business expenses

Here are the categories most small businesses can deduct. This is not exhaustive, but it covers the overwhelming majority of what shows up on a typical Schedule C or business return.

Rent and lease payments for office, retail, or equipment space
Employee wages, contractor payments (1099s), and payroll taxes
Software subscriptions and SaaS tools (QuickBooks, design tools, CRMs, etc.)
Office supplies, postage, and small equipment
Business insurance (general liability, professional, commercial property)
Advertising and marketing (ads, website, branding, printing)
Professional and legal fees, including bookkeeping and tax prep
Bank fees, merchant processing fees, and business loan interest
Utilities and business phone or internet used for the business
Business travel, lodging, and 50% of business meals
Vehicle and mileage costs for business driving
Education and training that maintains or improves your work skills
Retirement plan contributions (SEP-IRA, Solo 401(k), SIMPLE IRA)
Health insurance premiums (for the self-employed, often deductible)

Expenses with special rules or limits

A handful of common deductions are not all-or-nothing. These are the ones small business owners most often get wrong, so they are worth understanding.

Expense	2026 rule	Notes
Business meals	50% deductible	Must have a business purpose and a record of who, what, and why. Most entertainment is not deductible.
Home office	$5 per sq ft, up to 300 sq ft	The simplified method caps at $1,500/year. The actual-expense method has no cap but requires more records. The space must be used regularly and exclusively for business.
Business mileage	IRS standard rate per mile	The rate is set annually (it was 70 cents/mile in 2025). Confirm the current 2026 rate, and keep a mileage log. Alternatively, deduct a business-use share of actual vehicle costs.
Equipment & assets	Section 179 / bonus depreciation	Big purchases (computers, machinery, vehicles) can often be written off in the first year under Section 179 instead of depreciated over time, subject to annual limits well into the millions.
Startup costs	Up to $5,000 in year one	The rest is amortized over 15 years. The $5,000 deduction phases out if total startup costs exceed $50,000.
Gifts	$25 per recipient per year	A hard cap, anything above $25 per person is not deductible.

Expenses that are NOT deductible

Some costs feel business-related but are specifically disallowed by the IRS. Deducting these is a common audit trigger.

Personal, living, or family expenses (groceries, personal clothing, your commute)
Entertainment, concert, sporting event, and golf tickets, even with clients
Federal income taxes and most penalties or fines
Political contributions and lobbying
Commuting from home to a regular workplace
The full cost of a personal vehicle or phone used partly for business, only the business-use portion qualifies
Capital expenses you expense all at once when they should be depreciated

Why good bookkeeping is what actually captures these deductions

Knowing what is deductible is only half the battle. The IRS rule is that you must be able to substantiate the expense, which means a clean record and, in most cases, a receipt. Deductions you cannot document are deductions you may lose in an audit. Every year, small business owners overpay tax simply because expenses were never categorized, receipts went missing, or business and personal spending got mixed together in one account.

This is exactly where ongoing bookkeeping pays for itself. When your transactions are categorized monthly and reconciled against the bank, every legitimate deduction lands in the right place automatically, and you arrive at tax season with a tidy profit-and-loss statement instead of a shoebox of receipts. Two simple habits make this work: keep a dedicated business bank account and card, and reconcile every month.

A bookkeeper does not file your taxes, that is a CPA or tax preparer's job. But clean books are what make every deduction defensible and your tax prep faster and cheaper.

How IBRA helps you keep more of what you earn

IBRA Bookkeepers is a solo, QuickBooks Certified bookkeeping practice based in Dumfries, VA, serving small businesses across the DMV, DC, Maryland, and Northern Virginia. Service is 100% remote: we connect to QuickBooks Online and your bank securely, categorize and reconcile your books every month, and hand your CPA a clean set of records at tax time. No office visits, no hourly surprises.

Pricing is flat-rate and transparent:

Monthly Bookkeeping, from $500/month
Catch-Up & Cleanup, from $750, with a flat quote after a free assessment
Full Service, $750 + $500/month (cleanup plus ongoing books)

If your books are behind or your business and personal spending are tangled together, a catch-up and cleanup gets you back to a tax-ready position so no deduction slips through the cracks. Book a free consultation to talk through your situation, there is no long-term contract and no obligation.

This article is general information, not tax advice. Tax rules and 2026 figures change, and your situation is unique, confirm specifics with a CPA or tax professional before filing.