What Can You Actually Write Off? Let's Bust Some Tax Myths Once and For All

Every tax season I hear the same things. "My friend said I can write off everything." "I heard if you use your car for work it's 100% deductible." "Someone told me all my meals are a business expense." And every single time I have to deliver the same news — that's not how that works.

Tax deductions are real, powerful, and absolutely worth tracking. But misinformation about what you can actually write off can get small business owners into serious trouble with the IRS. So let's clear this up once and for all — myth by myth, fact by fact.

Myth #1: "I Work From Home So My Entire Home Is a Write Off"

This is probably the most common one I hear. The truth? You can deduct your home office — but only the portion of your home used regularly and exclusively for business. That means your kitchen table where you also eat breakfast doesn't count. The corner of your bedroom where you occasionally answer emails doesn't count either.

The IRS is very specific about this. Your home office space must be used regularly and exclusively for business — nothing else. If you have a dedicated room or a clearly defined workspace that is used only for your business you can deduct a percentage of your rent or mortgage, utilities, and internet based on the square footage of that space relative to your entire home.

The two ways to calculate it are the simplified method — $5 per square foot up to 300 square feet — or the regular method which calculates the actual percentage of your home used for business. Both are legitimate but your tax preparer can help you figure out which one gives you the better deduction for your situation.

The bottom line: Home office deduction is real — but only for dedicated business space, not your whole house.

Myth #2: "My Entire Phone and Internet Bill Is Deductible"

Close — but not quite. If you use your cell phone and internet for both personal and business purposes you can only deduct the business use percentage. So if you use your phone about 70% for business and 30% personally — 70% of your bill is deductible.

Now if you have a phone that is used exclusively for business — a dedicated business line — that's 100% deductible. But most small business owners use one phone for everything and that means you need to estimate your business use percentage honestly and consistently.

The same rule applies to your internet bill. If you work from home and use the internet for both personal streaming and business operations you deduct the business portion only. Nobody is going to audit your Netflix habits but the IRS does expect your deductions to reflect actual business use.

The bottom line: Deduct your business use percentage — not the full bill unless it's 100% business.

Myth #3: "All My Meals Are a Business Expense"

This one gets people in trouble more than almost any other deduction. Here's the real rule — meals are only deductible when they have a clear and legitimate business purpose. That means you're meeting with a client, discussing business with a potential partner, or the meal is directly connected to a business activity.

Even then the IRS only allows you to deduct 50% of qualifying business meals — not 100%. And you need documentation. Who was there, what business was discussed, and what was the business purpose. A receipt alone is not enough.

Grabbing lunch by yourself while working? Not deductible. Taking your spouse out to dinner and calling it a business expense? Not deductible. Treating a client to lunch to discuss a project? 50% deductible — with documentation.

The bottom line: Business meals are 50% deductible with a clear business purpose and proper documentation. Your daily lunch is not a write off.

Myth #4: "I Use My Car for Work So It's Fully Deductible"

Vehicle deductions are real — but the keyword is business use. If you use your personal vehicle for both personal and business driving you can only deduct the business portion. There are two ways to do this.

The standard mileage rate — for 2026 the IRS standard mileage rate is 72.5 cents from Jan 1st to June 30th per mile and from July 1st to Dec 31st 76 cents per mile for business miles driven. You track every business mile and multiply by the rate. Simple but requires consistent tracking.

The actual expense method — you track all your vehicle expenses including gas, insurance, repairs, and depreciation and deduct the percentage that represents business use. This method requires more record keeping but can sometimes yield a larger deduction.

What counts as business mileage? Driving to client meetings, job sites, the bank for business purposes, supply runs, and networking events. What doesn't count? Commuting from your home to your regular office. The IRS has never considered commuting a business expense.

The bottom line: Track your business miles from day one. Every mile you don't track is a deduction you're leaving on the table — but your personal driving never counts.

The One Rule That Covers All of This

Here's the simplest way to think about business deductions. The IRS allows you to deduct expenses that are ordinary and necessary for your business. Ordinary means common and accepted in your industry. Necessary means helpful and appropriate for your business.

If you can answer yes to both of those — it's likely deductible. If you're stretching to explain why a personal expense is business related — it probably isn't and the documentation won't hold up if you're ever questioned.

The goal is never to write off everything. The goal is to capture every legitimate deduction you're actually entitled to — because there are plenty of them and most small business owners miss more than they claim.

Don't Leave Money on the Table — But Don't Fabricate It Either

Working with a knowledgeable tax preparer means you get every deduction you're entitled to without the risk of claiming things that could trigger an audit or create problems down the road. That's the sweet spot — maximum legitimate deductions, zero guesswork.

At First Fruit Financial Management we help small business owners in Texas understand exactly what they can deduct, how to document it properly, and how to build habits throughout the year that make tax time straightforward instead of stressful.

Book a Free Consultation and and let's make sure you're not leaving money on the table — or claiming things that could cost you later.