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Home business owners routinely leave real money on the table simply because nobody walked them through what actually qualifies. Here’s the honest rundown, with the actual current numbers instead of vague descriptions. Once you’ve got these organized, E-file.com walks through claiming each one correctly on Schedule C.
The Home Office Deduction
If you use part of your home regularly and exclusively for business, that space — and a proportional share of rent or mortgage interest, utilities, and insurance — is deductible. “Exclusively” is the word that trips people up: a desk in the corner of a room you also use for other things doesn’t qualify the way a dedicated office does.
Equipment and Software
Computers, software subscriptions, office furniture, even a portion of your phone and internet bill if you can reasonably justify the business-use percentage. Keep the receipts and the reasoning, not just the total.
Mileage and Travel: The Actual Rate
Business-related driving is deductible at the IRS’s current standard mileage rate, which the IRS adjusts most years, or you can track actual vehicle expenses instead — whichever nets out higher for your situation, calculated once and then use consistently. Even a modest 5,000 business miles a year adds up to real money at the standard rate, which is exactly the kind of deduction that gets missed when the guidance stays vague instead of pointing you to the actual current number.
Retirement Contributions: The Deduction Most Home Business Owners Skip Entirely
A Solo 401(k) is available to anyone self-employed with no full-time employees other than a spouse, and it allows contributions as both “employee” and “employer” — up to the current IRS annual limit, higher still if you’re 50 or older using catch-up contribution rules. This is dramatically higher than a standard IRA’s limit, and every dollar contributed reduces taxable income for the year it’s contributed. For a profitable home business, this is routinely the single largest deduction available and the one most commonly left unclaimed simply because nobody set the account up.
Health Insurance Premiums: 100% Deductible Above-the-Line
Self-employed health insurance premiums — for yourself, your spouse, and dependents — are 100% deductible above-the-line, meaning they reduce your adjusted gross income directly rather than requiring you to itemize. This applies whether you’re buying a marketplace plan or COBRA coverage, as long as you’re not eligible for an employer-subsidized plan through a spouse’s job. It’s a deduction with real dollar impact that gets missed constantly, mostly because people assume health premiums only matter if they itemize — they don’t need to.
Half of Your Self-Employment Tax Is Deductible
Self-employment tax (Social Security and Medicare, paid by both the “employer” and “employee” side since you’re both when you’re self-employed) is a real cost most new home business owners underestimate. What often goes unmentioned: half of what you pay in self-employment tax is itself deductible from your adjusted gross income. It doesn’t offset the self-employment tax directly, but it does reduce your income tax liability, which is a meaningful partial offset that’s easy to miss if you’re not specifically looking for it.
Filing It All Correctly
This is the part that gets people in trouble — not the deductions themselves, but claiming them incorrectly. E-file.com walks through self-employment filing specifically, rather than treating a home business return like a standard W-2 filing with a few extra boxes checked. Their Deluxe tier (which covers most Schedule C self-employment situations) runs well under $30, and Premium around $42-50 — consistently priced below what the big-name software charges for the equivalent tier.
Start your filing with E-file.com once you’ve got your deductions organized.
Worth adding a word of caution here: the home office deduction specifically draws more scrutiny than most others precisely because it’s so commonly misclaimed. Keep photos of the space and a clear record of its exclusive business use, not just the square footage calculation, in case you’re ever asked to substantiate it.
The Home Office Deduction, Calculated Two Ways
There are two accepted methods for calculating the home office deduction, and picking the wrong one for your situation leaves real money unclaimed. The simplified method uses a flat rate per square foot of qualifying office space, capped at a maximum footage — fast to calculate, but often a smaller deduction for anyone with a larger dedicated space or higher home costs. The regular method calculates the actual percentage of your home’s square footage used for business and applies that percentage to your real housing costs — more paperwork, but often a meaningfully larger deduction if your home office is a significant share of your home or your housing costs are high. Running the numbers both ways in your first year is worth the extra time; most people default to the simplified method purely because it’s less paperwork, not because they checked which one actually saves more.
Vehicle and Mileage Deductions in More Detail
Similarly, there are two methods for vehicle expenses: the current IRS standard mileage rate or actual expenses (gas, maintenance, insurance, depreciation, calculated as a business-use percentage of total vehicle costs). The standard rate is simpler and often favors lower-mileage, newer vehicles; actual expenses often favor higher-mileage driving or an older vehicle with real, documented running costs. Whichever you choose in year one for a given vehicle generally has to be maintained for that vehicle going forward, so this is worth deciding deliberately rather than defaulting to whichever seems easier to calculate initially.
Record-Keeping That Actually Survives an Audit
A receipt alone often isn’t sufficient documentation on its own — what actually matters is being able to show the business purpose alongside the expense. For a piece of equipment, that means keeping a brief note on what it’s used for in the business, not just the purchase receipt. For mileage, a contemporaneous log (recorded at the time, not reconstructed months later from memory) is far more defensible than an estimate produced after the fact. None of this needs to be elaborate — a simple spreadsheet or a phone app used consistently beats a sophisticated system used inconsistently. With good records in hand, E-file.com makes actually claiming these deductions the easy part of the process.
Frequently Asked Questions
Can I deduct my home internet bill if I only use it partly for business?
Yes, proportionally — estimate the business-use percentage reasonably and apply that to the total bill. Keep the reasoning documented, not just the final number.
Do I need receipts for every single deduction?
For anything above a small threshold, yes — and even below it, keeping records makes an eventual audit far less stressful. A simple habit of photographing receipts as you go beats trying to reconstruct a year of expenses later.
What’s the biggest mistake home business owners make with deductions?
Being too conservative and missing legitimate deductions out of fear, or too aggressive and claiming things that don’t actually qualify — both come from not understanding the actual rules, which is exactly why proper filing software or guidance matters.
Does filing software actually handle self-employment deductions well, or do I need an accountant?
Good self-employment-focused software (like E-file.com’s Deluxe/Premium tiers) walks through Schedule C deductions specifically, which covers most straightforward home business situations well below the cost of hiring an accountant.
Is a Solo 401(k) worth setting up if my business only makes modest profit?
The contribution limit scales with your actual income and contributions, so a modest business won’t hit anywhere near the annual cap — but even a smaller contribution reduces taxable income directly, and the account is worth having set up before you need it, since opening one takes real lead time before certain contribution deadlines.