Self-Employed Tax Deductions Guide (2026)

You made money on your own this year. Now you need to figure out what you can write off before you file your Schedule C. The single biggest lever you have for lowering your tax bill? Tracking your business expenses and actually claiming them.

Most people either miss deductions they're entitled to or avoid claiming things because they're scared of the IRS. Both mistakes cost real money. This guide walks through the self-employed tax deductions that matter, how to categorize them, and what records you actually need to keep.

What Counts as a Business Expense

The IRS test is two words: “ordinary and necessary.” “Ordinary” means common in your line of work. “Necessary” means helpful and appropriate, not that your business literally can't survive without it.

Some quick examples:

• •Hair color, shears, and salon rent for a hairstylist
• •Adobe Creative Cloud and a portfolio website for a freelance designer
• •Gas, car washes, and a phone mount for a rideshare driver
• •Lumber, tools, and work boots for a contractor

The gut check: “Would someone else in my line of work buy this to do their job?” If yes, it's probably deductible.

Schedule C Categories in Plain English

Schedule C (Form 1040) breaks self-employed tax deductions into categories. For a detailed walkthrough of every line, see our Schedule C expense categories guide. You don't need to memorize these. Just know that most of what you spend on work fits somewhere.

The “Keep It Simple” Principle

Most accountants will tell you something that surprises people: a reasonable, consistent estimate is perfectly fine. You don't need to track every receipt to the penny. You don't need to agonize over whether your phone is 72% or 78% business use.

What the IRS cares about is that your deductions are reasonable and documented. Claiming 70% phone use every month because that honestly reflects your usage? Solid. Guessing a different number each month with no logic behind it? That's where problems start.

Pick a percentage. Be consistent. Write it down. Done.

Commonly Missed Deductions by Profession

These are the commonly missed tax deductions that leave money on the table year after year. What can you deduct as a freelancer, driver, stylist, or tradesperson that you might not realize?

Partial Deductions: Internet, Phone, and Home Office

You probably use your personal phone, home internet, and a room in your house for work. You can deduct the business portion of all three. The split doesn't need to be exact. It needs to be honest and consistent.

The Costco Problem: One Trip, Mixed Purchases

We've all done this. You walk into Costco for printer paper and cleaning supplies for the salon. You walk out with those, plus a case of La Croix, a rotisserie chicken, and somehow a patio umbrella. One receipt. One bank statement line. Business and personal, totally tangled up.

You've got three ways to handle it:

Split the receipt. If you still have it, add up the business items and deduct that amount. Cleanest option.

Estimate reasonably. Lost the receipt but know roughly half the cart was work stuff? Deduct 50%. That's fine as long as you're consistent and not padding it.

Let it go. If the business portion was tiny (like a $4 pack of pens buried in a $300 grocery run) it's not going to move the needle. Don't sweat it.

The only wrong answer is doing nothing because it feels complicated. A rough estimate beats zero.

Record-Keeping: What the IRS Actually Expects

People picture a shoebox of receipts organized by date and cross-referenced in a ledger. The real bar is lower than that, but you do need something.

For each expense, the IRS wants four things:

• •Amount: how much you spent
• •Date: when you paid it
• •Description: what it was
• •Business purpose: why you needed it

Your bank statement already covers the first three. The missing piece is business purpose, which is exactly what happens when you categorize each transaction into a Schedule C category.

How long to keep records: At least 3 years from when you filed. If you want to play it safe, 7 years. Digital copies are accepted. You don't need paper.

Common Mistakes That Cost You Money (or Trigger Audits)