Home Office Deduction for Mobile Field Techs: The Mileage Angle

If you run calls out of your truck all day, you probably assume the home office deduction is for people who sit at a desk. It isn’t just for them. For a mobile field tech, the real value of a qualifying home office has almost nothing to do with the square-footage write-off — and almost everything to do with what it does to your mileage.

Here’s the short version: if your home qualifies as your principal place of business, the drive from your house to your first job and home from your last job stops being non-deductible commuting and becomes deductible business mileage. For someone putting 25,000+ miles a year on a service van, that reclassification is usually worth far more than the office deduction itself.

The commuting trap most techs fall into

The IRS treats the trip between your home and a regular work location as personal commuting — it’s never deductible. For a W-2 employee that’s the end of the story. But a 1099 field tech doesn’t have one “regular work location.” You go wherever the work orders send you.

The problem is the first and last trip of the day. Without a qualifying home office, the drive from your driveway to the first site is commuting, and the drive from the last site back home is commuting too. Only the miles between job sites count. On a typical multi-stop day, that can quietly strip 20–40 deductible miles off your log.

When your home is your principal place of business, that changes. Trips from your home office to a work site — including the first and last of the day — are business miles.

What makes a home office “qualify”

Two tests have to be met, and for mobile techs the second one is the whole game:

1. Regular and exclusive use. You need a space used regularly and exclusively for your business. It doesn’t have to be a whole room, but the area you claim can’t double as the family guest room or the kids’ homework table. A dedicated corner where you handle scheduling, invoicing, parts ordering, and job documentation can work — but “exclusive” means exclusive.

2. Principal place of business. This is the one that unlocks the mileage benefit. Your home counts as your principal place of business if you use it regularly and exclusively for the administrative or management activities of your business, and you have no other fixed location where you conduct substantial administrative work.

That second test fits a lot of field techs perfectly. You don’t have a shop or an office somewhere else. You do your billing, scheduling, part sourcing, and record-keeping at home. The actual service work happens at customer sites — but the IRS specifically allows the “administrative or management activities” standard precisely because so many trades do their hands-on work off-site.

If you meet both tests, your home is your principal place of business, and those first-and-last-trip miles come back onto your mileage log.

Claiming the office itself: simplified vs. regular method

Once you qualify, you can also deduct the office space. You have two options.

Simplified method. Deduct $5 per square foot, up to a maximum of 300 square feet — a cap of $1,500. No depreciation, no receipts for utilities, no recapture headaches when you sell the house. For most techs with a modest home-office corner, this is the clean choice.

Regular method. Deduct the business-use percentage of your actual home costs — mortgage interest or rent, utilities, insurance, repairs, and depreciation. More paperwork, but if you have a large dedicated space and high home costs, it can beat the $1,500 cap.

You can switch methods year to year, so it’s worth estimating both. But remember the home-office deduction is usually the smaller prize here; the mileage reclassification is the big one.

How this stacks with your mileage deduction

The two deductions work together, not against each other. Qualifying for a home office doesn’t change how you deduct mileage — you still use the standard mileage rate (or actual expenses, if you track those). It changes which miles count.

And 2026 has a wrinkle worth knowing when you tally those newly-deductible miles: the business standard mileage rate is not flat this year. It’s 72.5 cents per mile for January 1 through June 30, 2026, then 76 cents per mile from July 1 onward, per IRS Announcement 2026-11. So the extra first-and-last-trip miles you pick up are worth slightly more in the back half of the year. Keep your log dated so the right rate applies to the right miles.

For the full breakdown of the rate split and how to keep a log that survives scrutiny, see our mileage deduction guide.

A quick example

Say you run six-day weeks, and on a typical day your home-to-first-site and last-site-to-home trips add up to 30 miles that used to be commuting. Over roughly 300 working days, that’s about 9,000 miles a year you were leaving on the table.

At 2026’s rates — a blend of 72.5 cents and 76 cents depending on when you drove — that’s roughly $6,500 in additional deductible mileage you can now legitimately claim, purely from qualifying your home as your principal place of business. The $5/sq-ft office deduction on top is a bonus, not the headline.

That example is illustrative, not a promise — your numbers depend on your actual miles and when you drove them. But it shows why this is the single most overlooked move for mobile techs.

What to keep on file

• A simple floor-plan note or photo showing the dedicated, exclusive-use space and its square footage.
• A dated mileage log (odometer or app) that distinguishes business trips — now including first-and-last-site trips — from personal driving.
• Notes showing you do your admin work (scheduling, invoicing, parts, records) at home and have no other fixed office.

This ties into the broader picture of running the books as a sole proprietor — see our overview of 1099 field tech taxes for how the home office, mileage, and your quarterly estimated payments fit together across the year.

Run the numbers before you file

The home office deduction and the mileage it unlocks are classic examples of money that’s easy to miss if you’re not modeling your year before April. TechLedger is a free, browser-based estimator that helps 1099 field techs project their federal self-employment and income tax, including the mileage deduction, so you can see the impact of decisions like this while there’s still time to act.

It gives you planning estimates, not tax advice, and it’s federal-only — your state and local situation should be checked separately, and nothing here replaces a tax professional. Everything you enter stays in your browser; nothing is sent to a server.