Schedule C for Mobile Mechanics: What You Can Actually Deduct

September 9, 2026 · 6 min read

The short version

Your van, your tools, the parts you buy, your phone, and your insurance are all deductible in some form. The two things that cost mechanics the most money are picking the wrong vehicle method in year one and mixing sales tax collected into gross receipts. Both are avoidable with decent records.

If you run mobile and you are not incorporated, your business lives on Schedule C — profit or loss from business, attached to your personal return. Income at the top, expenses in the middle, net profit at the bottom. That net profit is what you pay income tax and self-employment tax on, so every legitimate expense you fail to record is money you hand over for no reason.

Start with gross receipts, and keep sales tax out of it

Gross receipts is everything you collected for work performed. Cash, check, Venmo, Cash App, Zelle, card — all of it, whether or not anyone sent you a 1099.

What does not belong in gross receipts is sales tax you collected on parts. That money was never yours. You collected it on the state's behalf and you remit it later.

If you dump every dollar that hit your account into gross receipts, you inflate your income by the full amount of tax you collected all year — and you pay income tax and 15.3% self-employment tax on money you already sent to the state. On a mechanic doing $40,000 in taxable parts sales at 7%, that is $2,800 of phantom income.

The fix is bookkeeping, not cleverness: track sales tax collected as its own number from the first invoice, and never let it into your revenue column.

Your vehicle: mileage or actual expenses

This is the biggest single deduction most mobile mechanics have, and you get two ways to take it.

Standard mileage. Multiply your business miles by the IRS rate for the year. Simple, and it requires only a mileage log. You cannot also deduct gas, oil, repairs, tires, or insurance on top of it — the rate already covers those. Parking and tolls stay deductible separately.

Actual expenses. Add up what the vehicle really cost — fuel, oil, tires, repairs, insurance, registration, depreciation, lease payments — and deduct the business-use percentage of the total.

For a working mobile mechanic, actual expenses often wins, because a service van is expensive to buy, expensive to insure, terrible on fuel, and it carries a thousand pounds of tools. The mileage rate is calibrated to an average passenger car, not a loaded Transit.

Two things to know before you choose:

The first year matters. The method you elect in the first year you use the vehicle for business limits what you can switch to later. Start with actual expenses on a vehicle you own and you generally cannot move to standard mileage on it afterward. The exception is narrow: if you used actual expenses with straight-line depreciation and no Section 179 or bonus depreciation, you can still switch later. Any accelerated depreciation locks that vehicle into actual expenses. Start with mileage and you keep more flexibility.
Business-use percentage is not a guess. If the van is 90% work and 10% grocery runs, you deduct 90%. Keep the log that proves it. A vehicle used 100% for business with no other car in the household draws attention, so if that is genuinely your situation, your records need to be genuinely good.

Either method requires the same underlying record: date, miles, where you went, and the business purpose, recorded as you drive rather than reconstructed in April.

Tools and equipment

Tools are deductible. How they get deducted depends on cost and life.

Small consumable stuff — sockets, a torque wrench, drill bits, sealant, gloves, shop rags — comes off as a regular expense in the year you buy it.

Big-ticket items with a useful life over a year — a scan tool, a scope, a floor jack, a generator, a compressor, the van itself — are capital purchases. They can be depreciated over several years, or often expensed immediately under Section 179 or bonus depreciation. Immediate expensing usually feels better, but not always: in a year where your income is low, spreading the deduction across future higher-income years can be worth more. That is a conversation for whoever prepares your return.

Keep the receipts either way. Tool truck financing counts too — the payments include interest, and business interest is deductible.

Parts and supplies

Parts you buy and resell to customers generally run through cost of goods sold, not the expense section. Same money, different line, and it matters because COGS reduces gross profit directly.

If you hold inventory — a stock of filters, fluids, common brake components — you count what is on the shelf at the start and end of the year. Most mobile guys buy per job and carry very little, which keeps this simple.

Shop supplies that are not billed to a specific customer — brake clean, penetrating oil, zip ties, wire, connectors — are ordinary expenses.

Not sure what to charge in the first place? The free mobile mechanic quote calculator shows what a job leaves you after parts and sales tax.

Phone, insurance, and the rest

Phone. Deduct the business-use percentage of your plan. If your phone is your dispatch, your invoicing, your parts ordering, and your camera, that percentage is high — but "high" is not "100%" unless you carry a second personal phone. Pick a defensible number and stay consistent.

Insurance. General liability, garage keepers, and commercial auto are all deductible business expenses. Health insurance premiums for a self-employed person are usually handled as an adjustment on your personal return rather than on Schedule C — different line, still a deduction.

Everything else that keeps the business running: ASE certification and testing fees, training, subscription repair databases, invoicing and business software, business bank and merchant processing fees, advertising, uniforms with your business name on them, licenses and permits, and a home office if you have a space used regularly and exclusively for the business.

Records are the whole game

None of this works without documentation. The deduction you cannot support is the deduction you lose, plus interest.

At minimum, keep through the year: gross receipts by job, sales tax collected as a separate figure, parts cost, expenses sorted by category, and a mileage log. That is five numbers. If you invoice from your phone as you work, WrenchStrike keeps those totals running so tax time is a matter of reading them off rather than rebuilding a year from a glovebox full of receipts.

Set aside money as you go, too. Self-employment tax runs 15.3% on top of income tax, and nobody is withholding it for you.