If you've got an IRS letter on your desk right now, you have a decision to make, and the clock matters. I'm Darrin Mish. I've spent 32 years helping people with exactly this kind of situation. Here's what you should do.
The Jacksons Had a Real Business. They Still Lost Every Deduction.
The Tax Court actually said the Jacksons had genuine, substantial business purposes for their RV. The judge wrote it in the opinion. They lost anyway. The Ninth Circuit affirmed.
That should worry anyone with a motor home and a business. It should also tell you something important: the Jacksons didn’t lose because the deduction was invalid. They lost because nobody put the right argument in front of the court.
That’s a positioning problem, not a substantive one. And positioning problems are fixable.
Why the Jacksons Got Wiped Out
The IRS argued that Section 280A – the vacation home rules – disallowed everything. Section 280A limits deductions on a dwelling unit when personal use exceeds 14 days. The Jacksons exceeded 14 days. Game over, as far as the IRS was concerned.
The Jacksons’ counsel made one argument: Section 280A doesn’t apply to motor homes at all. The court rejected that, applied the 14-day rule, and disallowed everything.
Here’s what was missing from the courtroom: Section 280A(f)(4). The Jacksons’ lawyers never argued it. The IRS never had to defeat it. Neither court mentioned it. It’s the most important provision in this entire fight, and nobody put it in play.
Section 280A(f)(4): The Provision That Should Have Won the Case
Here is the actual statutory language:
“Nothing in this section shall be construed to disallow any deduction allowable under section 162(a)(2) or any deduction which meets the tests of section 162(a)(2) but is allowable under another provision of this title by reason of the taxpayer’s being away from home in the pursuit of a trade or business…”
Read that twice. “Nothing in this section.” Not “nothing in subsection (c).” Not “nothing in the residence rules.” Nothing in the entire section.
Once an expense qualifies as business travel under Section 162(a)(2), the away-from-home rule, then Section 280A cannot be used to disallow it. The 14-day rule doesn’t apply. The dwelling-unit rules don’t apply. None of it applies. Section 280A(f)(4) shuts the door on that whole line of attack.
The legislative history backs this up cleanly. The Senate Finance Committee said the amendment was meant to clarify that the personal use rules will not deny otherwise allowable business travel deductions. Senator Dole said on the floor that businessmen away from home should be able to deduct the business portion of out-of-town lodging, depreciation, utilities, and similar costs with appropriate personal-use allocation.
This is the argument the Jacksons never made.
Transportation, Lodging, or Both
When you park a motor home and sleep in it, what is it? A vehicle or a place to stay? The courts have wrestled with this for decades. The Shirley case essentially shrugged and said the deduction worked either way.
The practical answer is that your motor home can be:
- A business transportation vehicle (track mileage)
- A business lodging facility (track nights)
- Both at the same time (track both)
You don’t have to pick. You do have to document. And you have to assert the right code section when the IRS comes knocking.
How the Numbers Actually Work
Say you buy a $300,000 motor home in 2026 and use it 80 percent for business. Most Class A, B, and C motor homes clear the 6,000-pound GVWR threshold by a wide margin, which means the luxury-auto depreciation caps don’t squeeze you the way they squeeze cars and light SUVs. That changes everything.
You have three legitimate paths forward.
Option 1: 100 Percent Bonus Depreciation
Bonus depreciation is back at 100 percent for property placed in service in 2026. For your $300,000 motor home with 80 percent business use, that’s a $240,000 first-year deduction. Done.
The reason this is the strongest tool: it isn’t limited by your business income. If you have a slow year and want to generate or deepen a net loss, bonus depreciation lets you. Section 179 doesn’t.
Option 2: Section 179 Expensing
Section 179 can also get you to $240,000 on the same purchase. But it comes with two strings attached. Your total deduction can’t exceed your business taxable income (unused amounts carry forward), and for vehicles in the 6,001 to 14,000 pound SUV band, a special cap kicks in.
Larger motor homes often exceed 14,000 pounds GVWR or otherwise fall outside the SUV cap entirely. When yours does, full Section 179 is back on the table. The ceiling is generally the same as bonus depreciation. The constraints are different.
If you have the income to absorb it, either tool works. If you don’t, bonus depreciation wins.
Option 3: MACRS Five-Year Depreciation
Not every business owner wants a $240,000 deduction on the first page of the return. Sometimes the optics matter. Sometimes the income isn’t there. Sometimes you just don’t need it.
Straight MACRS five-year depreciation gives you:
- Year 1: $48,000 (20 percent of $300,000 x 80 percent)
- Year 2: $76,800 (32 percent)
- Year 3: $46,080 (19.2 percent)
That’s 71.2 percent of the total depreciation in three years. No income limitation. No SUV cap. Less likely to draw a second look at the return.
The Documentation That Wins the Audit
After 32 years of fighting the IRS, I can tell you exactly what kills a motor home deduction: weak records. Not aggressive numbers. Not big deductions. Weak records.
A motor home is “listed property” under Section 280F(d)(4). That means you don’t get the deduction just because you bought the vehicle. You have to substantiate every business use with a contemporaneous log, broken down by:
- Business use
- Investment use
- Personal use
- Commuting use
For the lodging side, you also need a nights-sleeping log. Every night the motor home is occupied gets classified the same way: business, investment, or personal. Note the business reason for each business night.
No log, no deduction. The court will not be sympathetic.
The Hoye Precedent You Want in Your Back Pocket
Dr. Robert Hoye was a thoracic surgeon who had to be available 24 hours a day for up to five days after certain surgeries. The local motel sometimes had no vacancy. Renting an apartment didn’t make sense. He bought a $192,215 motor home, rented a pad three blocks from the hospital, and stayed there when he was on call.
The IRS hit him with everything. Not ordinary and necessary. Too lavish. Not deductible. The Tax Court disagreed on every point. The court granted Dr. Hoye his depreciation deduction for the business-use portion of the motor home and made clear that the lavish and extravagant rule does not apply to depreciation.
The full Tax Court later applied the same reasoning in Noyce, where an Intel officer deducted his personal airplane. Same result. Same logic.
When the IRS tries to tell you your motor home is too expensive to deduct, Hoye and Noyce are the answer.
The 50 Percent Rule You Cannot Forget
Here’s the trap that catches people three years into the deduction: if your business use drops to 50 percent or less at any point in the first six years, you have to recapture some of your earlier deductions and pay tax on them at ordinary income rates.
The big first-year deduction feels great. The recapture bill three years later does not. Plan the business use you can actually sustain.
The Bottom Line
The motor home deduction is real. The Jacksons proved that you can have a real business, real expenses, and a real legal theory and still lose every dollar if your lawyer doesn’t put the right argument in front of the court.
Get the GVWR over 6,000 pounds. Keep business use above 50 percent. Document mileage and nights. And when the IRS challenges the deduction, lead with Section 280A(f)(4). That’s the difference between Jackson and a win.
Get the Strategy Right Before You Need It
If you own a motor home, are thinking about buying one, or are already taking the deduction and want to make sure your position survives an audit, let’s talk. The Law Offices of Darrin T. Mish, P.A. handles tax planning and IRS controversy for business owners. Call (813) 229-7100 for a consultation.
