RV and trailer dealers gain full interest deduction in 2025

The One Big Beautiful Bill Act delivers a targeted but meaningful change for recreational vehicle and trailer dealers under Section 70303. The provision modifies Internal Revenue Code Section 163(j)(9)(C) to add recreational trailers and campers designed for temporary living to the definition of "motor vehicle" for purposes of the floor plan financing exception. The change applies to taxable years beginning after December 31, 2024, meaning RV and trailer dealers can already claim the expanded treatment on their 2025 tax filings.

For RV and trailer dealers, the change closes a structural inequity that had penalized one segment of the recreational vehicle industry. Self-propelled motorhomes (Class A, Class B, and Class C) were already covered as "motor vehicles" under the prior floor plan financing exception. Travel trailers, fifth wheels, and pop-up campers, despite serving the same recreational customer base and being sold through the same dealer networks, were not covered because they lack their own propulsion systems. Under Section 70303, the towable side of the recreational vehicle industry now receives the same favorable interest deduction treatment that the motorized side has received for years.

This article walks through what Section 70303 actually amended, why the floor plan financing exception matters for dealer profitability, dollar-level scenarios illustrating the impact on the interest deduction, and how the expansion interacts with broader business interest limitation rules under Section 163(j).

What Section 70303 changed about floor plan financing

The Section 163(j) business interest expense limitation generally caps a business's deductible interest expense at 30% of adjusted taxable income, with various adjustments for capital-intensive industries. The floor plan financing exception under Section 163(j)(9) creates a carve-out from this limitation for interest expense incurred to finance the acquisition of motor vehicles, boats, farm machinery, and similar inventory held for sale or lease.

Floor plan financing is the standard mechanism by which dealerships finance their inventory. A dealer borrows money from a floor plan lender to acquire vehicles from manufacturers, holds those vehicles in inventory for sale, and pays interest to the lender during the holding period. When a vehicle sells, the dealer pays down the loan principal associated with that vehicle. The interest paid during the holding period is a real and substantial cost of operating any vehicle dealership.

Before OBBBA, the floor plan exception's "motor vehicle" definition covered self-propelled vehicles: cars, trucks, motorcycles, recreational motorhomes, boats, farm equipment, and construction equipment. Towable vehicles without their own propulsion (travel trailers, fifth wheels, pop-up campers) were not included, even though they are sold by the same dealers, financed through the same lender networks, and serve the same recreational use cases.

Section 70303 amends Section 163(j)(9)(C) by expanding the "motor vehicle" definition to include "recreational trailers or campers designed for temporary living quarters which are designed to be towed by a motor vehicle." The change is narrowly targeted but operationally significant for the trailer side of the recreational vehicle industry.

The effective date is tax years beginning after December 31, 2024, which means calendar-year dealers can already claim the expanded floor plan treatment on their 2025 tax returns filed in 2026.

Why does the floor plan exception matter for dealers

The floor plan exception matters because dealer interest expense can be a very large component of total operating cost, and the Section 163(j) general limitation can otherwise prevent full deduction in years where adjusted taxable income is compressed.

A typical RV or trailer dealership carries inventory that turns over several times per year, with average inventory levels running into the millions of dollars for even a moderately sized operation. Floor plan interest at current rates (typically the lender's funding rate plus a spread, often 7% to 10% all-in for prime dealers in 2025) can run into the hundreds of thousands of dollars annually for a single dealership.

Without the floor plan exception, that interest would be subject to the general 30% limitation on adjusted taxable income. In a year of weak retail sales (lower adjusted taxable income), a dealer might face a meaningful disallowance of otherwise deductible interest, with the disallowed portion carrying forward indefinitely but generating no current-year tax benefit. The floor plan exception allows dealers to deduct the full interest expense in the year incurred, regardless of adjusted taxable income, thereby smoothing the tax effect across business cycles.

For dealers structured through S Corporations or Partnerships, the interest deduction flows through to the owners' individual returns. A dealer paying $300,000 in floor plan interest credits the owner pool with a $300,000 deduction. If the general 30% limitation otherwise capped the deduction at $200,000 in a weak year, the floor plan exception protects the additional $100,000 of immediate deduction value, which, at a 32% combined federal and state rate,e is $32,000 of cash tax saved.

For dealers structured through C Corporations, the same dynamic applies at the entity level: the floor plan exception preserves immediate deductibility of the full interest expense, supporting after-tax cash flow during cyclical downturns.

Which dealer types benefit from the expansion

The Section 70303 expansion specifically helps dealers whose inventory was previously outside the floor plan exception due to the towable-versus-self-propelled distinction.

Travel trailer dealers, including dealers of conventional travel trailers, expandable trailers, and lightweight teardrop trailers, are now covered. These dealers historically had to navigate Section 163(j) limitations on inventory financing in years of compressed earnings.

Fifth wheel dealers, who sell larger trailers designed to be towed by pickup trucks with specialized hitches, are now covered. Fifth wheel inventory tends to be higher-value per unit, meaning floor-plan interest exposure per dealer is often substantial.

Pop-up camper and small camper trailer dealers fall within the expansion. These dealers tend to have higher unit volumes at lower per-unit values, but the cumulative floor plan interest expense across inventory still runs into meaningful annual amounts.

Mixed-inventory RV dealers selling both motorhomes and towable products previously had to track floor plan interest separately for the two categories: motorhome interest qualified for the exception, towable interest did not. Under Section 70303, this tracking simplification means the entire floor plan interest expense across all RV product types qualifies under a single framework.

Specialty trailer dealers serving the toy-hauler segment (trailers with rear garage space for ATVs, motorcycles, or other recreational equipment) are covered to the extent that their trailers are designed for temporary living quarters. Trailers designed solely for cargo without living accommodations may fall outside the new definition, requiring careful classification of mixed-purpose units.

For dealer owners considering Late S Corporation elections or Late C Corporation elections for entity restructuring, the floor plan financing benefit applies regardless of entity choice. Still, the flow-through versus C corporation treatment of the underlying interest deduction may affect the optimal structure decision.

How much does the expansion save dealers in real dollars

The dollar-level value of the expanded floor plan exception depends on the dealership's inventory size, average holding period, and floor plan interest rate. Three illustrative scenarios show the scale.

Scenario one. A travel trailer dealership operates with an average inventory of $4 million, holding inventory for an average of 90 days before sale. At an 8% all-in floor plan rate, annual floor plan interest expense is approximately $320,000. In a weak year where adjusted taxable income is compressed, the general 30% Section 163(j) limit might cap deductible interest at $250,000, disallowing $70,000 as an indefinite carryforward. Under Section 70303, the full $320,000 is deductible in the year incurred. At a 32% combined effective rate, the additional $70,000 of immediate deduction saves approximately $22,400 in cash taxes that year.

Scenario two. A fifth-wheel dealership with an average inventory of $6 million and similar holding periods incurs approximately $480,000 in annual floor-plan interest. In a year where the general 30% limit would have allowed only $360,000 of deduction, the floor plan exception protects the additional $120,000 of deductibility. At a 30% combined rate, the dealer captures approximately $36,000 in additional immediate cash tax savings.

Scenario three. A mixed-inventory RV dealer that carries both motorhomes and towable trailers has historically deducted motorhome floor-plan interest under the exception and has been treated under Section 163(j) for trailer interest. Total floor plan interest of $750,000, split roughly 60% motorhome ($450,000) and 40% trailer ($300,000) under prior rules. Trailer interest occasionally faced a disallowance of $50,000 to $100,000 in weak years. Under Section 70303, the full $750,000 falls within the floor plan exception and is fully immediately deductible regardless of the business cycle position.

For dealers using Depreciation and amortization on dealership real estate, signage, computer systems, and demo units, those depreciation deductions operate independently of the floor plan exception and continue under their own framework.

How does Section 70303 fit broader Section 163(j) rules

Section 163(j) is a broader business interest expense limitation framework that affects many businesses with substantial debt-funded operations. The floor plan exception is one of several carve-outs from that general limitation. Understanding how Section 70303 fits within the broader framework helps dealers and their advisors model the full picture of interest expense.

The general Section 163(j) limitation applies to most business interest expenses, capping the deduction at 30% of adjusted taxable income. The limit was designed to prevent excessive interest deductions that disconnect from real economic activity. Several exceptions exist for industries where heavy debt-funded inventory or assets are inherent to the business model.

The floor plan financing exception is one such carve-out, designed specifically for dealer-style businesses that finance inventory through specialized lender arrangements. Real estate businesses can elect out of Section 163(j) under separate provisions. Small businesses with average annual gross receipts below approximately $30 million (indexed) are exempt from the limitation entirely.

Section 70303's expansion of the floor plan definition keeps dealer inventory financing fully deductible without affecting the broader Section 163(j) framework. Dealers continue to track non-floor-plan interest (such as interest on real estate loans, working capital credit lines, or owner financing) under the general rules.

For dealer owners using Home office deductions for home-based operational support, Travel expenses for industry events and supplier visits, or Vehicle expenses on dealer-owned vehicles, those deductions operate independently of the floor plan exception.

How should dealers update their tax filing approach

For RV and trailer dealers preparing their first tax filings under Section 70303 (covering tax years beginning after December 31, 2024), several practical updates make sense.

Reclassify trailer inventory floor plan interest from general business interest to floor plan financing interest. The interest needs to be tracked separately on the books to support the characterization of the deduction on the tax return.

Refresh dealer floor plan agreements to confirm the underlying loan structure meets the floor plan financing definition. The exception requires that the inventory specifically secure the financing and that it be paid off as the inventory sells. Most existing floor plan arrangements with established RV industry lenders already meet this standard, but new entrants and refinanced arrangements should be reviewed.

Coordinate with floor plan lenders on year-end interest reporting to ensure the lender's reporting categorizes trailer interest correctly under the new framework.

For dealers employing children in family business operations, Hiring kids strategies operate on a separate track from the floor plan financing question. Both can apply simultaneously to the same dealership.

Dealers offering Employee achievement awards programs to sales staff continue to deduct those awards under the standard fringe benefit rules, independent of the inventory financing treatment.

What documentation supports the floor plan deduction

Documentation requirements for the floor plan financing exception under Section 70303 follow the existing framework for self-propelled vehicle floor plan interest. The expansion does not change the documentation type, just the inventory categories that qualify.

Required documentation includes:

• Floor plan loan agreements with the lender, specifying the inventory-secured nature of the loan and the payoff mechanism upon vehicle sale
• Year-end interest statements from the floor plan lender showing total interest paid, ideally categorized by inventory type to support the tax position.
• Inventory tracking records linking specific units to specific loan principal amounts, supporting the interest allocation if the dealer's accounting requires it
• Sales records connecting inventory dispositions to corresponding loan payoffs demonstrate that the floor plan structure operates as intended.

For dealer owners structuring family business succession through wage and ownership planning, integrating floor plan financing benefits with other strategic tools like Tax loss harvesting on personal investment portfolios creates a coordinated approach to managing both business and personal tax positions.

How Instead supports RV and trailer dealers in 2026

Section 70303 takes effect for tax years beginning after December 31, 2024, which means RV and trailer dealers should already be claiming the expanded floor plan treatment on their 2025 tax returns. For the 2026 tax year and beyond, the change is permanent and locks in equal floor-plan treatment across the entire recreational vehicle industry.

Visit Instead's comprehensive tax platform to track floor plan interest expense, confirm proper categorization under the expanded definition, and integrate the deduction with broader dealer-level tax planning. Review pricing plans to find the support tier that matches your dealership's complexity.

Frequently asked questions

Q: When does Section 70303 take effect?

A: Section 70303 applies to tax years beginning after December 31, 2024, which means calendar-year dealers can claim the expanded floor plan treatment starting with their 2025 tax returns filed in 2026. The expansion is permanent and applies to all subsequent tax years.

Q: Which trailers qualify under the new definition?

A: Recreational trailers and campers designed for temporary living quarters that are designed to be towed by a motor vehicle qualify. This includes travel trailers, fifth wheels, pop-up campers, and similar towable recreational units with living accommodations. Trailers designed solely for cargo without living facilities generally fall outside the definition.

Q: How is "designed for temporary living quarters" determined?

A: The trailer must include features supporting temporary residential use, such as sleeping accommodations, cooking facilities, and similar living amenities. Manufacturers' specifications and intended use designations typically support the classification. Pure cargo trailers and equipment-only trailers without living quarters do not qualify.

Q: Does the expansion change what counts as floor plan financing?

A: No. The underlying floor plan financing requirements remain the same. The financing must be secured by the inventory, structured for payoff upon the sale of specific units, and obtained from a lender that provides specialized inventory financing. Section 70303 simply expands the inventory categories that qualify, not the financing structure itself.

Q: Can dealers retroactively apply the change to earlier tax years?

A: No. The effective date is tax years beginning after December 31, 2024. Tax years that began before that date remain subject to the prior rules. Calendar-year dealers begin claiming the expanded treatment for the 2025 tax year.

Q: How does Section 70303 interact with the small business exemption from Section 163(j)?

A: Small businesses with average annual gross receipts under approximately $30 million (indexed) are exempt from the entire Section 163(j) limitation and do not need the floor plan exception to deduct their full interest expense. Section 70303's benefit accrues primarily to mid-size and larger dealerships that exceed the small business gross receipts threshold and would otherwise face Section 163(j) limits in compressed earnings years.