Small Business Tax Deductions: What Expenses Are Write‑Offable in 2025

Learn which costs a small business can claim as tax deductions in 2025, how to document them, avoid common traps, and maximize your write‑offs.
Read MoreRunning a one‑person business feels like juggling a hundred tasks at once. Among those tasks, filing taxes with the IRS often tops the list of worries. The good news? If you’re a sole proprietor, the form you need is Schedule C, and you don’t have to be a tax wizard to get it right.
Schedule C (Profit or Loss from Business) is the worksheet attached to your personal 1040 that tells the IRS how much money your business made or lost. You’ll need it if you earn income from self‑employment, freelancing, consulting, or any side hustle that isn’t covered by a W‑2. Even if you make just a few hundred dollars a year, the IRS expects you to report it, so it’s better to file early and avoid penalties.
The form is split into sections: revenue, expenses, cost of goods sold, and a final profit line. The profit (or loss) you calculate here flows straight into your 1040, affecting your overall tax bill and eligibility for certain deductions.
1. Keep good records all year long. Use a spreadsheet, accounting app, or simple notebook to track every sale, receipt, and invoice. When you have the numbers at hand, the form stops feeling like a mystery.
2. Know which expenses are deductible. Common deductions include home‑office costs, internet, phone bills, travel, supplies, and vehicle mileage. Make sure each expense is “ordinary and necessary” for your business – that’s the IRS rule.
3. Separate personal and business money. A dedicated bank account and credit card make it easy to spot business expenses. Mixing the two can trigger an audit and slow down your filing.
4. Don’t forget depreciation. If you bought equipment, a computer, or a vehicle, you can spread the cost over several years. Using the IRS’s straight‑line or Section 179 methods can lower this year’s profit.
5. Review the cost of goods sold (COGS). If you sell physical products, COGS includes the cost of inventory, shipping, and packaging. Subtracting COGS from revenue gives you a more accurate profit figure.
6. Double‑check math and totals. A tiny mistake in totals can throw off the whole return. Use the IRS’s online calculator or a tax software tool that auto‑fills Schedule C fields.
7. File on time. The deadline for Schedule C is the same as your personal tax return – usually April 15. If you can’t meet it, file for an extension (Form 4868) but remember you still owe any taxes due.
Many small‑business owners think they have to hire an accountant to tackle Schedule C. While professional help can be valuable, the form is straightforward enough that you can handle it yourself with a bit of organization and the right resources.
Bottom line: treat Schedule C like any other business tool – keep it clean, update it regularly, and use every legitimate deduction to keep more of what you earn. By following these steps, you’ll file confidently, avoid costly errors, and stay on the right side of the IRS.
Learn which costs a small business can claim as tax deductions in 2025, how to document them, avoid common traps, and maximize your write‑offs.
Read More