Motor Home Tax Deductions: Interest, SALT Cap, and Business Use

Motor home tax deductions are available when the IRS treats your RV as a home, meaning it has sleeping, cooking, and toilet facilities. Once it clears that bar, you can deduct loan interest on up to $750,000 in acquisition debt, value-based property tax within the SALT cap, and business expenses if the RV genuinely does business work. All of these require itemizing on Schedule A, and for 2026 the standard deduction is $16,100 for single filers and $32,200 for joint filers¹ — a threshold many RV owners never clear.

Does Your Motor Home Qualify as a Residence

IRS Publication 936 defines a home as “a house, condominium, cooperative, mobile home, house trailer, boat, or similar property that has sleeping, cooking, and toilet facilities.”² A Class A, B, or C motor home with a bed, a stove or microwave, and a bathroom hits all three. A cargo van or a truck with just a camper shell doesn’t.

The tax code lets you designate one main home and one other residence as qualified.³ Most owners already have a conventional house, so the RV falls into the second-home slot.

If you never rent the motor home out, it qualifies as a second home with no minimum personal-use requirement. Rent it out and different rules apply: you also have to use it personally for more than 14 days or more than 10 percent of the days it was rented, whichever is longer.⁴ Miss that mark and the IRS reclassifies the RV as rental property, which is a different set of rules entirely.

Deducting Interest on the RV Loan

Loan interest is usually the biggest deduction on the table. Two things have to be true: the loan proceeds were used to buy, build, or substantially improve the motor home, and the loan is secured by the RV itself.⁵ Standard dealer or bank RV financing checks both boxes without extra effort. An unsecured personal loan to buy the same motor home would not.

The deductible interest applies to a combined $750,000 in acquisition debt across your primary home and the motor home. If you already owe $600,000 on your house, only $150,000 of the RV loan fits inside the deductible window. Interest on the balance above the cap produces nothing.⁵ Married filing separately, the cap is $375,000 each.

If you financed the motor home on or before December 15, 2017, the older $1,000,000 limit still applies, as long as the original loan is in place or has been refinanced for no more than the outstanding balance.⁶

One trap. If you take out a home equity loan secured by the motor home and spend the money on something else, say paying off credit cards, that interest is not deductible. Home equity interest only qualifies when the proceeds go toward buying, building, or substantially improving the residence that secures the debt.⁷

Property Tax, Sales Tax, and the SALT Cap

Personal property tax on the motor home is deductible as part of the state and local tax deduction, but only when the tax is based on the RV’s value (an ad valorem tax) and charged annually. Flat registration or weight-based fees don’t count.⁸

The overall SALT deduction is capped at $40,000 for single filers and joint filers, or $20,000 for married filing separately. That ceiling covers every state and local tax you pay combined, income or sales tax plus property tax on every property you own.⁸ If your state income tax and house property tax already max out the cap, the motor home’s property tax adds nothing on top. Taxpayers with modified AGI above $500,000 see the $40,000 cap phased down, though it never drops below $10,000.

The Sales Tax Election in a Purchase Year

Instead of deducting state and local income taxes, you can elect to deduct state and local general sales taxes. You pick one, not both.⁸ This election tends to pay off in the year you buy the RV, or if you live in a state with no income tax. The sales tax on a $200,000 motor home is real money. The IRS Sales Tax Deduction Calculator estimates whether the election beats deducting your income taxes.⁹ Either choice still lives under the same SALT cap.

Deductions When the RV Does Business Work

If the motor home genuinely serves a business purpose, a mobile office, a traveling vendor rig, a work-travel vehicle, a separate set of deductions opens up. Fuel, maintenance, insurance, and depreciation come off on Schedule C, but only the business-use share. Use the RV 60 percent for business and 40 percent for personal trips and you deduct 60 percent of each qualifying expense.

The 50 Percent Rule and Recapture

If business use falls to 50 percent or below in any year, the IRS confines you to the slower alternative depreciation system instead of the standard accelerated method.¹⁰ If you already claimed accelerated depreciation in earlier years above the 50 percent line and personal use later creeps past it, you have to recapture the excess and add it back to income. That surprise tax bill catches people off guard.

Section 179 and 100 Percent Bonus Depreciation

Business-use motor homes qualify for the fastest write-offs the code offers. Most full-size RVs weigh well over 14,000 pounds, which puts them above the vehicle weight limits that squeeze Section 179 for cars and lighter SUVs. For 2025, the general Section 179 limit was $2,500,000, and vehicles over 14,000 pounds were not subject to the SUV cap of $31,300. The 2026 limits have not yet been officially published but are expected to rise slightly with inflation.

The One Big Beautiful Bill Act permanently reinstated 100 percent bonus depreciation for eligible business property placed in service after January 19, 2025. A qualifying motor home used primarily for business could potentially be written off in full in the year it’s placed in service. Business use still has to exceed 50 percent, and only that percentage of the cost qualifies.

Documentation is where these claims live or die. The IRS expects contemporaneous mileage logs with date, destination, business purpose, and miles for each trip. A log reconstructed after the fact will not hold up under audit.

Whether Itemizing Is Actually Worth It

Every deduction here requires itemizing on Schedule A, so your mortgage interest, property taxes, and other itemized amounts have to add up to more than $16,100 single or $32,200 joint before itemizing beats the standard deduction.¹

The math falls apart for a lot of RV owners here. If your house is paid off and your only itemizable items are a modest RV loan and some state taxes, you likely won’t clear the standard deduction. The deduction pays off best for owners still carrying a house mortgage who add a financed motor home on top. Interest and taxes combined push the itemized total past the bar.

What Happens When You Sell

If the motor home was your primary residence, you may be able to exclude some or all of the gain on sale. Section 121 shelters up to $250,000 in gain for single filers and $500,000 for joint filers.¹¹ You must have owned and used the RV as your principal residence for at least two of the five years before the sale. The two years don’t have to run consecutively.

Full-time RVers who live in the motor home year-round are the ones most likely to qualify. Part-timers with a separate main house don’t, because the RV was their second home, not their principal residence. Any stretch when the motor home wasn’t your principal residence counts as nonqualified use, and gain tied to that time isn’t eligible.¹¹

You can only use the Section 121 exclusion once every two years. Claim it on another home within the past two years and the motor home sale is fully taxable regardless of how long you lived in it.

Records to Keep

The original loan agreement showing the motor home as collateral and the proceeds used to buy it.
Form 1098 from your lender reporting the mortgage interest paid. If a smaller lender doesn’t issue one, keep your own payment records showing the interest portion.¹²
Official property tax bills showing the tax was calculated on the RV’s assessed value, not a flat fee.
Purchase receipts showing sales tax paid, if you plan to elect the sales tax deduction in the purchase year.
A contemporaneous mileage log with dates, destinations, miles, and business purpose for every trip, with the business-use percentage totaled at year-end.

If the IRS questions whether the motor home even qualifies as a residence, interior photos, the manufacturer’s specification sheet, or the RV’s title classification will usually settle it. Factory-built RVs rarely draw that question. Custom conversions where the facilities aren’t obvious from the vehicle type do.

1
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
2
Internal Revenue Service. Publication 936 – Home Mortgage Interest Deduction
3
Legal Information Institute. 26 USC 163(h)(4) – Qualified Residence
4
Office of the Law Revision Counsel. 26 USC 280A – Disallowance of Certain Expenses in Connection With Business Use of Home
5
Office of the Law Revision Counsel. 26 USC 163 – Interest
6
Internal Revenue Service. Real Estate Taxes Mortgage Interest Points Other Property Expenses
7
Internal Revenue Service. Real Estate Taxes Mortgage Interest Points Other Property Expenses
8
Internal Revenue Service. Topic No. 503, Deductible Taxes
9
Internal Revenue Service. Use the Sales Tax Deduction Calculator
10
Office of the Law Revision Counsel. 26 USC 280F – Limitation on Depreciation for Luxury Automobiles
11
Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence
12
Internal Revenue Service. About Form 1098, Mortgage Interest Statement