Most service business owners overpay their taxes. Not because the rules are stacked against them, but because they're too busy running the business to track expenses well. The same lawn care operator who knows the exact RPM their commercial mower runs at can't tell you what they spent on fuel last month — and the IRS doesn't refund what you don't claim.
This is a plain-English guide to the biggest tax write-offs available to self-employed home service business owners. What you can deduct, what you can't, and the categories owners most often miss.
This is general information, not legal or tax advice. Tax rules vary by entity type, state, and situation. Talk to a CPA before filing.
The IRS test: "ordinary and necessary"
The general rule for any business deduction is the IRS "ordinary and necessary" standard. Ordinary means common in your trade. Necessary means helpful and appropriate. A pressure washer is ordinary and necessary for a pressure washing business. A jet ski is not, no matter how badly you want one for "team morale."
The expense also has to be reasonable, not lavish, and supported by a paper trail — a receipt, a bank statement, or a mileage log.
The big categories of write-offs
1. Vehicle expenses
For most service business owners, this is the single largest deduction. You have two methods, and you generally have to pick one in the first year you use the vehicle for business.
Standard mileage rate. For 2026, the IRS business standard mileage rate is 72.5 cents per mile (IRS Notice 2026-10). Drive 15,000 business miles in a year and that's $10,875 in deductions without tracking gas, maintenance, or insurance separately.
Actual expenses. Track every business-related cost — fuel, oil, tires, repairs, insurance, registration, depreciation — and deduct the business-use percentage. More complex, but often bigger if you drive a heavy work truck or rack up serious annual maintenance.
Either way, you need a mileage log with the date, miles, destination, and business purpose for every trip. A free app like MileIQ or the tracker built into your accounting software handles this without you thinking about it.
A note on commuting: the trip from home to your first regular business location generally isn't deductible — unless your home qualifies as your principal place of business under the home office rules, in which case the trip from your home office to the first job site is deductible.
2. Home office
If you use a portion of your home regularly and exclusively for business — admin, scheduling, estimates, bookkeeping — you can deduct it. Two methods.
Simplified method. $5 per square foot, up to 300 square feet, for a maximum of $1,500. No receipts, no allocation. Just measure the space.
Actual expense (regular) method. Calculate the percentage of your home used for business, then deduct that percentage of utilities, mortgage interest or rent, property taxes, insurance, and depreciation. More paperwork, often a bigger deduction if your housing costs are high.
The rules are strict. The space has to be used regularly and exclusively for business — the kitchen table you eat dinner at every night doesn't count. See IRS Publication 587 for the full set of rules.
3. Equipment, tools, and supplies
This is where Section 179 changes the game. Normally, equipment bought for a business has to be depreciated over its useful life — 5 to 7 years for most tools and trucks. Section 179 lets you deduct the full cost in the year you buy it, up to a limit far higher than any solo operator will ever hit (over $2.5 million for 2026).
What qualifies:
- 01Mowers, pressure washers, ladders, vacuums, power tools
- 02Computers, tablets, phones used for business
- 03Off-the-shelf software
- 04Vehicles over 6,000 lbs GVWR (with separate caps and rules)
Important: the equipment has to be in service before the end of your tax year to count. Buy on December 28 and use it on a job — you're in. Buy on December 28 and leave it in the box until January — you're out.
Smaller supplies — cleaning chemicals, fuel, sandpaper, dump fees, mulch, gloves — are deducted in full as supplies in the year you buy them. No depreciation needed.
4. Insurance
Several types are deductible:
- 01General liability insurance
- 02Commercial auto insurance (or the business-use percentage of personal auto if you use actual expenses)
- 03Workers' compensation insurance
- 04Bonding fees
- 05Professional liability / errors and omissions
Health insurance premiums for the self-employed are deductible above the line, meaning you don't have to itemize to claim them. This is a big one new owners miss. If you pay your own health insurance and your business has net profit, you can usually deduct 100% of the premiums (limited to your business income).
5. Software, phone, and internet
The business-use percentage of these is deductible:
- 01Field service / scheduling / invoicing software (100% if used only for business)
- 02QuickBooks or other accounting software
- 03Cell phone (most CPAs accept 70–90% business use for solo operators)
- 04Internet (business-use percentage)
- 05Domain, website hosting, business email
- 06Cloud storage and backup
6. Marketing and advertising
100% deductible:
- 01Google Local Services Ads, Google Ads, Facebook Ads
- 02Yard signs, magnets, branded polos, business cards
- 03Website design and maintenance
- 04Door hangers, flyers, direct mail
- 05Sponsorship of a local Little League team
Branded clothing with your logo (uniforms) is deductible. Plain clothes you'd wear anywhere else aren't, even if you only wear them to work.
7. Professional services
- 01Accountant and bookkeeper fees
- 02Tax preparation fees
- 03Attorney fees for business matters (entity formation, contract review)
- 04Business consultants and coaches
- 05Trade association dues
8. Education and training
Deductible if it maintains or improves skills required in your current trade. A pesticide license recertification for a pest control business — yes. A real estate licensing course because you're considering a career change — no.
9. Subcontractors and helpers
Cash you pay to a subcontractor is deductible. If you pay any individual subcontractor $600 or more in a calendar year, you generally have to issue a 1099-NEC. The 1099 requirement isn't optional — failing to file can cost you the deduction in an audit.
W-2 employee wages are deductible too, plus your share of payroll taxes and any benefits.
10. Travel and meals
Travel away from your tax home for business — a trade show, a training, an out-of-town job — is generally fully deductible: airfare, hotel, rental car, baggage fees.
Meals during business travel or with a client are 50% deductible. The food has to be reasonable. You can't write off your kid's birthday dinner because you "talked about work."
Entertainment — sporting events, concerts — is generally 0% deductible under current rules. Don't try.
11. Bank fees and payment processing
The fees Square, Stripe, or your merchant processor takes out of every payment are 100% deductible. So are business bank account fees, wire fees, and the annual fee on a card used for the business.
These add up faster than people expect. A typical 2.9% + 30¢ payment processor on $80,000 in card revenue is about $2,300 a year in deductions.
12. Retirement contributions
A SEP-IRA or Solo 401(k) lets a self-employed owner contribute well beyond a regular IRA limit. Contributions reduce taxable business income now while building a retirement balance. Annual limits change — ask a CPA which structure fits your situation.
Two big "above the line" deductions
These aren't business expenses on Schedule C, exactly, but they directly reduce taxable income for self-employed people.
- 01Half of your self-employment tax. SE tax is 15.3% of net earnings — you can deduct half of what you paid as an adjustment to income.
- 02Self-employed health insurance premiums (as covered above).
Things owners commonly miss
- 01Bank fees and payment processor fees (2–3% of revenue is a lot of money)
- 02Subscriptions you forgot about — cloud storage, route software, mileage apps
- 03Mileage between job sites (deductible even when the commute isn't)
- 04Tools you bought out of pocket without a receipt — start photographing them
- 05Continuing education and license renewal fees
- 06Half of self-employment tax
- 07Self-employed health insurance premiums
Things people think they can write off but can't
- 01The full cost of a personal vehicle used 50% for business (only the business-use portion)
- 02Plain clothes worn to work
- 03Personal grooming, gym memberships, haircuts
- 04Lunch you eat alone at home
- 05The commute from home to a single regular work location (without a qualifying home office)
- 06Speeding tickets and parking fines
Recordkeeping that holds up in an audit
The deduction is only as good as your paper trail. The minimum:
- 01A separate business bank account (not legally required for sole props, but the line every CPA draws first)
- 02A separate business credit card
- 03A mileage app running in the background
- 04Photos of every paper receipt within 24 hours
- 05A 30-minute review of categorized expenses each quarter
- 06A year-end backup of everything
If you get audited 18 months from now, you don't want to be reconstructing 2025 from memory. See [paying quarterly taxes] for the cadence that catches problems early.
Frequently asked questions
What's the biggest tax deduction for a service business owner?+
Can I write off my truck if I bought it for my service business?+
Can I write off business meals?+
Do I need an LLC to take business deductions?+
How much can I deduct for a home office?+
Can I deduct startup costs from before I had any revenue?+
What happens if I don't keep good records?+
Stop losing deductions to bad bookkeeping
The biggest reason service business owners overpay tax isn't the rules — it's that receipts get lost and miles never get logged. Homespace tracks your invoices, payments, and customer history in one place and gives your accountant clean data to work with at year-end, so you stop leaving deductions on the table. Start your free trial and head into next April with your records ready.