Written by Maryam Ajorloo, CPA · Reviewed by Behdad Karimi Dermeni, CPA
Nobody started a business because they love tracking expenses. You started it to do the thing you're actually good at, and somewhere along the way a shoebox (or a shoebox-shaped folder on your desktop) quietly filled up with receipts and good intentions. The good news: a lot of what's in there can lower your tax bill. The slightly less good news is that "a lot" is doing some heavy lifting in that sentence, so let's sort out exactly what counts.
This guide covers the small business tax deductions that apply to almost every owner, the one rule that decides whether an expense qualifies, and how to make sure none of them slip through the cracks before tax season.
What is a small business tax deduction? A small business tax deduction, also called a write-off, is a business expense the IRS lets you subtract from your revenue before your income is taxed. Every legitimate write-off lowers your taxable income, which lowers what you owe. It is not free money, but it is money you keep instead of hand over.
Keeping good books all year is what makes these deductions easy to claim instead of a March scramble. If your records are a mess, ReInvestWealth's AI Bookkeeper categorizes your transactions for you, so the write-offs are already sorted when you need them.
The one rule behind every write-off
Before the list, here is the rule that explains all of it. The IRS lets you deduct expenses that are **ordinary and necessary** for running your business (this is Internal Revenue Code Section 162, for the curious). Ordinary means common and accepted in your line of work. Necessary means helpful and appropriate for your business.
That is the whole test. If an expense is ordinary and necessary for earning your business income, you can generally write it off. A laptop for a graphic designer? Ordinary and necessary. A jet ski "for client meetings"? The IRS has seen that one before, and it will not go well.
When an expense is partly business and partly personal (your phone, your car, your home internet), you only write off the business-use portion. That is it. Keep that rule in your head and most write-off questions answer themselves.
The most common small business tax deductions
These are the write-offs almost every business owner can use. Each one still has to pass the ordinary-and-necessary test, and each one needs a record to back it up.
Home office. If you use part of your home regularly and exclusively for business, you can deduct it. The simplified method is the easy path: $5 per square foot, up to 300 square feet, for a maximum write-off of $1,500. "Exclusively" is the catch, so the kitchen table where your family also eats dinner does not count.
Vehicle and mileage. Drive for work? You can deduct your business miles using the IRS standard mileage rate, which for 2026 is 72.5 cents per mile for the first half of the year and 76 cents per mile for the second half. Drive 5,000 business miles and that is roughly $3,700 off your taxable income. Commuting from home to a regular workplace does not count, but trips to clients, suppliers, and job sites do.
Business meals. Meals with clients, or while traveling for business, are 50% deductible. An $80 lunch to talk through a project becomes a $40 write-off. Note the merchant, the date, who you met, and why, because "I definitely bought lunch that day" is not a record.
Software and subscriptions. The tools you run your business on (accounting software, design tools, your scheduling app, cloud storage, project management) are fully deductible. If you are a service business, this is often one of your biggest and most-forgotten categories.
Advertising and marketing. Your website, ads, branding, business cards, and the fee you pay a freelancer to run your social accounts are all deductible. Money spent getting customers is about as ordinary and necessary as it gets.
Professional services. Fees you pay to accountants, bookkeepers, lawyers, and consultants for your business are deductible. Yes, that includes what you pay to keep your books clean, which is the rare expense that pays for itself twice.
Business insurance. General liability, professional liability, and other business coverage are deductible. Self-employed owners may also be able to deduct health insurance premiums, which is worth a conversation with your accountant.
Office supplies and small equipment. The everyday stuff (paper, printer ink, a monitor, a desk) is deductible in the year you buy it. Bigger equipment purchases have their own, more generous rules, covered in the next section.
Business travel. Flights, hotels, rental cars, and baggage fees for genuine business trips are deductible. The trip has to be primarily for business, so a conference in Miami is fine; three vacation days tacked onto the end are not.
Education and training. Courses, certifications, books, and industry conferences that maintain or improve the skills your business needs are deductible. Learning something entirely new for a different career is not.
Business interest and bank fees. Interest on a business loan or business credit card, plus monthly account and processing fees, are deductible. If you use Stripe or a similar processor, those per-transaction fees add up to a real deduction over a year.
Contract labor. Payments to freelancers and independent contractors are deductible. If you pay any one contractor $600 or more in a year, you will generally need to file a Form 1099-NEC, so keep their details on hand.
The bigger write-offs: equipment, QBI, and startup costs
A few deductions are large enough (and changed enough for 2026) to deserve their own spotlight.
Equipment purchases (Section 179 and bonus depreciation). When you buy something substantial that lasts more than a year, like a computer, camera gear, or machinery, you would normally deduct it slowly over several years. Two rules let you deduct the full cost right away instead. Section 179 lets you expense qualifying equipment up to $2.56 million in 2026, and 100% bonus depreciation (made permanent under the 2025 tax law for property placed in service after January 19, 2025) lets you write off the full cost of most qualifying purchases the year you start using them.
The Qualified Business Income (QBI) deduction. This is one of the biggest breaks for pass-through owners (sole proprietors, partnerships, and S corporations). For 2026 it lets eligible owners deduct up to 23% of their qualified business income, up from 20% in prior years. It phases out at higher income levels and has some fine print, so this is a great one to confirm with your accountant, but for many owners it is the single largest deduction on the return.
Startup costs. If 2026 is your first year, you can deduct up to $5,000 of the costs you racked up getting the business off the ground (market research, legal setup, early advertising) even though you spent some of it before you technically opened. Keep those early receipts.
What you can't write off
Knowing the limits keeps your books clean and your return defensible. These are the ones owners get wrong most often:
Personal expenses. Your weekend groceries, your regular gym membership, your family vacation. If it was not ordinary and necessary for the business, it stays off the books. The IRS is genuinely not interested in your weekend.
Your commute. Driving from home to a regular place of work is personal, not a business trip, no matter how much you would like it to be otherwise.
Clothing you can wear anywhere. A branded uniform or safety gear is deductible; the nice outfit you bought for client meetings but also wear on weekends is not.
The personal slice of mixed expenses. For your phone, internet, or a car used for both, only the business-use percentage is deductible. Estimate it honestly and keep something to back it up.
Where you actually claim these deductions
Where your write-offs land depends on how your business is set up:
Sole proprietors and single-member LLCs report income and deductions on Schedule C, filed with your personal Form 1040.
Partnerships and multi-member LLCs file Form 1065, and each owner gets a Schedule K-1.
S corporations file Form 1120-S; C corporations file Form 1120.
The write-offs themselves are largely the same across structures. What changes is the form they flow through. If you are unsure which applies to you, that is exactly the kind of question your accountant answers in five minutes.
How to capture every write-off (without the shoebox)
Here is the part most guides skip. Knowing the deductions is easy. The money is lost in the gap between spending and record-keeping, when a receipt fades, a transaction goes uncategorized, or you simply forget that Tuesday lunch was a client meeting. A few habits close that gap:
Keep business and personal separate. Run business spending through a dedicated business account and card. This one habit does more for clean books than anything else, because every transaction in that account is already a business transaction. One thing we hear often from owners: they paid for something with a personal card and assumed it was lost. It is not. A business expense paid personally is still deductible; you just need to record it properly so it lands on the books.
Capture receipts as you go. The IRS generally expects you to keep records for at least 3 years (longer in some cases). Snap or forward receipts the moment you get them instead of hunting for them in April. ReInvestWealth's Smart Shoebox (your receipt inbox) reads each receipt and matches it to the right transaction automatically, so your write-offs come with proof attached.
Let the categorizing happen automatically. This is exactly what ReInvestWealth's AI Bookkeeper handles. Connect your bank, and the AI sorts your transactions into the right categories as they come in, so nothing sits uncategorized and no deduction gets missed. (Heads up: a bank connection usually pulls only the last couple of months of history, so if you are starting mid-year you can upload past statements to backfill the rest. Here is how to catch up on your books if you are behind.)
More than 3,000 entrepreneurs run their books on ReInvestWealth, and it holds a 4.8-star rating on Capterra. What that means for you at tax time: instead of reconstructing a year of spending from memory, you hand your accountant clean, categorized, receipt-backed books, and every deduction you earned is already there.
Frequently asked questions
What can I write off as a small business owner?
Any expense that is ordinary and necessary for running your business, meaning common in your field and helpful to earning income. That covers home office, mileage, software, advertising, professional fees, business meals (at 50%), insurance, equipment, travel, and more. Personal expenses and your commute do not qualify.
Do I need receipts for every deduction?
You need records to support your deductions, and the IRS generally expects you to keep them for at least 3 years. For most expenses that means a receipt or invoice plus a bank or card record. Digital copies are fine, which is why capturing receipts as you go beats digging for them later.
Is a tax deduction the same as a tax credit?
No. A deduction lowers the income you are taxed on. A credit lowers your actual tax bill dollar for dollar. Both help, but a credit is generally worth more per dollar. This guide covers deductions (write-offs).
Can I deduct expenses I paid with my personal card?
Yes. A business expense is deductible based on what it was for, not which card paid for it. You just need to record it properly so it appears on your business books. Keeping a dedicated business account makes this far cleaner going forward.
How much can I write off in my first year?
Beyond your regular operating expenses, you can deduct up to $5,000 of startup costs in your first year, plus qualifying equipment through Section 179 and bonus depreciation. The rest of your ordinary and necessary expenses are deductible as usual.
Start tax season with the write-offs already sorted
Every deduction on this list is only useful if it actually makes it onto your books. Connect your bank, let the AI categorize your transactions, and forward your receipts as they come in. Clean, audit-ready books, and the write-offs are captured before you ever think about your return. Start free for 30 days.
A note from our CPAs: This guide is educational and covers the general federal rules for US small business owners. Tax situations vary, and some deductions have income limits and fine print, so for advice on your specific circumstances, talk to your accountant. (If they use ReInvestWealth, they will already have clean books to work from.)
Written by Maryam Ajorloo, CPA
Maryam Ajorloo is the co-founder of ReInvestWealth and a CPA who specializes in small business tax and everyday bookkeeping. She helps entrepreneurs keep clean, audit-ready books and make sense of write-offs, filing deadlines, and the numbers behind their business. Read more · Connect on LinkedIn
Reviewed by Behdad Karimi Dermeni, CPA
Co-founder of ReInvestWealth and a founding community builder at Stripe. Behdad built ReInvestWealth to give smart, busy entrepreneurs CPA-level accounting without the CPA-level price tag. Read more · Connect on LinkedIn
