A tax deduction is a business expense you subtract from your income before tax is calculated, so every real, documented deduction lowers what you owe. The two things that trip people up aren’t the exotic write-offs; they’re knowing which ordinary costs qualify and keeping records solid enough to prove them. This is the working list of deductions most small businesses actually use, plus the recordkeeping habit that turns them from “I think I can claim that” into a number your CPA signs off on.
This is educational, not tax advice. Deduction rules, percentages, and limits change, and your specific situation may differ, so confirm current figures at irs.gov and let your CPA make the call. Good books don’t replace your accountant; they hand your accountant clean numbers to work from.
The rule under every deduction: “ordinary and necessary”
The IRS standard is short: an expense is deductible if it’s ordinary (common in your line of work) and necessary (helpful and appropriate for the business). That’s the test to apply before anything else. A graphic designer’s software subscription is ordinary and necessary; a designer’s boat generally is not. The expense also has to be a business expense, not a personal one dressed up as one, which is why keeping business and personal money apart (here’s how) matters so much.
The major deduction categories
Home office
If part of your home is used regularly and exclusively for business, you can deduct a share of rent, utilities, and upkeep. There’s a simplified per-square-foot method and a detailed one. The “exclusively” word is strict, so the kitchen table doesn’t count, but a dedicated room can.
Vehicle: mileage vs actual
For business driving you pick one of two methods. The standard mileage rate multiplies your business miles by a per-mile figure the IRS sets each year. The actual expense method deducts the business-use share of gas, insurance, repairs, and depreciation. Mileage is simpler and often wins for lighter drivers; actual can win for expensive vehicles. Either way, you need a mileage log; how to track mileage and vehicle expenses walks through keeping one that survives an audit.
Software and subscriptions
The tools you run the business on: accounting software, design apps, hosting, project management, professional memberships. These add up quietly, which is exactly why you should track your subscriptions so none slip through uncounted.
Meals (generally 50%)
Business meals are usually deductible at 50%: a lunch with a client, meals while traveling for work. Keep the receipt and a note of the business purpose and who was there. Entertainment, by contrast, is generally not deductible anymore.
Travel
Airfare, lodging, and ground transportation for business trips are fully deductible when the trip is primarily for business. The line between a business trip and a vacation with a meeting attached is where records save you.
Contractor payments
What you pay freelancers and contractors is deductible, and it doubles as your 1099 data. Track who you paid and how much all year; our 1099 preparation guide shows the tagging system that makes January painless.
Education, insurance, and retirement
- Education: courses and training that maintain or improve skills for your current business (not qualifying you for a new career) are generally deductible.
- Insurance: business liability and similar coverage. Self-employed health insurance has its own special treatment, so ask your CPA where it goes.
- Retirement contributions: self-employed plans like a SEP-IRA or solo 401(k) can shelter a meaningful chunk of income. This is one of the biggest levers and worth a conversation with your accountant.
Records are the deduction
Here’s the part people skip: a deduction you can’t document is a deduction you don’t really have. If you’re ever audited, the deduction that survives is the one with a receipt, a date, an amount, and a business purpose attached. The goal isn’t to hoard paper, it’s to attach proof to each transaction as it happens so the record assembles itself.
That’s why the receipt should live on the transaction, not in a drawer. Snap it, attach it, categorize the expense, move on. A year later the audit trail is already built. Drowning in paper already? How to organize business receipts shows the system that lands each one on its transaction.
From category to deduction to Schedule C line
Deductions and bookkeeping are the same job seen from two angles. When you categorize an expense correctly, you’re also deciding which deduction and which tax line it belongs to. Do that all year and tax time is a report, not a reconstruction.
LedgerMCP is built for this loop: you (or an AI assistant you connect) categorize each transaction, tag it by vendor or project, and attach the receipt right to it. At tax time the Schedule C report regroups your categorized year onto the numbered tax lines and suggests a mapping for anything unmapped, so your deductions land where they belong with the proof stapled on.
"Categorize this and attach the receipt." → $240.00 Adobe Creative Cloud → Software & subscriptions → Maps to Schedule C line 27a (Other expenses) → Receipt attached · tagged: software
Quick answers
Are business meals deductible?
Generally at 50%, when there’s a clear business purpose. Keep the receipt and jot down who you met and why. Entertainment (concert tickets, a round of golf) generally is not deductible.
Mileage or actual expenses, which should I use?
Whichever gives the bigger deduction for your situation, but you need records either way: a mileage log for the standard method, or receipts for the actual method. Many light drivers find mileage simpler and larger.
Can I deduct my phone and internet?
You can deduct the business-use portion. If your phone is 60% business, roughly 60% of the bill is deductible. A dedicated business line is cleaner because it’s 100% deductible and easy to prove.
What records do I actually need to keep?
For each expense: the amount, the date, the vendor, and the business purpose, plus the receipt for larger items. Keeping them attached to the transaction in your books, rather than loose, is what makes them hold up.