The New Car Loan Interest Deduction: Up to $10,000 Off Your Taxes (But Read the Fine Print)

Starting in 2025, you can deduct up to $10,000 in car loan interest on your federal return — but only if the vehicle was new, assembled in the United States, purchased (not leased), and used for personal purposes. This is one of the most misunderstood provisions in the One Big Beautiful Bill Act, and I have already seen clients assume it applies to vehicles that do not qualify. This guide covers every requirement, every limitation, and the NJ angle that most articles skip entirely.

I wrote this because the headlines are misleading. "Deduct your car loan interest!" sounds like every car payment just became tax-deductible. It did not. The provision is narrower than the Child Tax Credit expansion, more restrictive than the overtime deduction, and completely invisible to NJ state returns. If you are a New Jersey resident, this deduction saves you federal dollars only — your NJ-1040 does not change by a penny.

Every IRC citation, threshold, and phaseout number in this guide is current as of March 2026. If Congress or the IRS changes anything, I update the guide.

In this guide:

1. What IRC Section 163(h)(4)(E) Actually Says
2. Which Vehicles Qualify (and Which Do Not)
3. How to Verify US Assembly: Window Stickers and VIN Decoders
4. The $10,000 Cap and How It Works
5. Income Phaseouts: The Math That Reduces Your Deduction
6. Lease vs. Purchase: Why Leases Do Not Qualify
7. Refinancing Rules
8. Business vs. Personal Use Allocation
9. Where to Claim It: Schedule 1-A, Part IV
10. NJ Non-Conformity: Why This Deduction Does Not Exist on Your State Return
11. Worked Examples at Different Income Levels
12. FAQ

What IRC Section 163(h)(4)(E) Actually Says

Section 163(h)(4)(E) of the Internal Revenue Code was added by the One Big Beautiful Bill Act (OBBBA, Public Law 119-21), signed July 4, 2025. It creates an above-the-line deduction for qualified motor vehicle loan interest. Above-the-line means it reduces your adjusted gross income (AGI) directly — you do not need to itemize to claim it. The deduction is reported on the new Schedule 1-A, Part IV.

The provision is temporary. It applies to tax years 2025 through 2028 only. Unless Congress extends it, the deduction disappears after December 31, 2028. Four tax years. That is the window.

Key statutory requirements:

• The interest must be on a loan used to purchase a qualified motor vehicle
• The vehicle must be new (not used, not certified pre-owned)
• The vehicle must be assembled in the United States (final assembly, not just parts sourced domestically)
• The vehicle must be for personal use (not business use claimed on Schedule C or Form 4562)
• Maximum deduction: $10,000 per year
• Filing status requirement: if married, you must file jointly (MFS is not allowed for this deduction)
• Subject to income-based phaseouts

Which Vehicles Qualify (and Which Do Not)

The statute uses the term "qualified motor vehicle," which is defined specifically. This is not the same as the definition used for the clean vehicle credit under Section 30D or the definition used for Section 179 vehicle deductions. Each tax provision defines vehicles differently, and assuming one definition applies to another is a common mistake.

Vehicles that qualify:

• New cars, trucks, SUVs, and vans with final assembly in the United States
• Both traditional internal combustion engine (ICE) vehicles and electric vehicles (EVs), as long as they meet the assembly requirement
• Motorcycles do NOT qualify — the statute references vehicles with four or more wheels

Vehicles that do NOT qualify:

• Used vehicles — regardless of age, mileage, or condition. A one-year-old certified pre-owned vehicle with 3,000 miles does not qualify
• Leased vehicles — even if the lease is on a brand-new US-assembled vehicle
• Vehicles assembled outside the United States — a Toyota Camry assembled in Georgetown, Kentucky qualifies; a Toyota Corolla assembled in Guanajuato, Mexico does not
• Vehicles used for business — if you claim the vehicle as a business deduction (Section 179, MACRS depreciation, or actual expense method on Schedule C), the personal interest deduction under Section 163(h)(4)(E) does not apply to that vehicle
• Recreational vehicles, boats, aircraft — not qualified motor vehicles under this section

The "Assembled in the United States" Requirement

This is the requirement that will trip up the most people. "Assembled in the United States" means final assembly occurred at a plant located in the United States. It does not mean every part was made in America. It does not mean the brand is American. It means the vehicle was put together — final assembly — on US soil.

Examples that surprise people:

• BMW X5 (assembled in Spartanburg, SC) — qualifies
• Volkswagen Atlas (assembled in Chattanooga, TN) — qualifies
• Honda Accord (assembled in Marysville, OH) — qualifies
• Chevrolet Equinox EV (assembled in Ramos Arizpe, Mexico) — does NOT qualify
• Ford Maverick (assembled in Hermosillo, Mexico) — does NOT qualify

The brand on the badge is irrelevant. The assembly location is everything.

How to Verify US Assembly: Window Stickers and VIN Decoders

Before you rely on this deduction, verify the assembly location. There are two reliable methods:

Method 1: The Monroney Sticker (Window Sticker)

Every new vehicle sold in the United States is required by federal law (49 USC Section 32908) to display a window sticker showing the final assembly point. The label reads "Final Assembly Point" followed by a city and state (if US) or country. If your vehicle has already been purchased, your dealer can provide a copy, or you can request one from the manufacturer.

Method 2: VIN Decoder

The Vehicle Identification Number (VIN) encodes the country of manufacture in the first character. For US assembly, the VIN starts with 1, 4, or 5. Canadian assembly starts with 2. Mexican assembly starts with 3. German assembly starts with W. Japanese assembly starts with J. You can use the NHTSA VIN Decoder to confirm the plant location. Enter your full 17-digit VIN and look for "Plant Information" in the results.

Important: Some manufacturers assemble the same model at multiple plants in different countries. The 2026 Toyota RAV4, for example, is assembled in both Georgetown, Kentucky and Woodstock, Ontario, Canada. Two identical-looking RAV4s sitting next to each other on a dealer lot might have different qualification status. Always check the specific VIN, not just the model name.

The $10,000 Cap and How It Works

The maximum deduction is $10,000 per tax return per year. This is not per vehicle — it is per return. If you finance two qualifying vehicles, your combined interest deduction is still capped at $10,000.

What counts as interest:

• Interest paid on the auto loan during the tax year
• Only interest — not principal, not fees, not gap insurance, not extended warranties
• The lender will report interest paid on Form 1098 or a year-end statement

What does not count:

• Dealer documentation fees
• Title and registration fees
• Sales tax on the vehicle purchase
• Late payment fees or penalties
• Capitalized interest (interest added to the loan balance rather than paid)

At current auto loan rates (averaging 6.5-8.5% for new vehicles in early 2026), a $50,000 loan at 7.5% generates approximately $3,750 in first-year interest. You would need a loan balance well above $100,000 to approach the $10,000 cap in a single year. Most taxpayers will deduct significantly less than the maximum.

Income Phaseouts: The Math That Reduces Your Deduction

The deduction phases out at higher income levels. The phaseout is based on modified adjusted gross income (MAGI).

Phaseout thresholds:

How the phaseout works:

For every $1,000 (or fraction thereof) that your MAGI exceeds the phaseout threshold, your maximum deduction is reduced by $200. The math is straightforward:

• At $100,000 MAGI (single): full $10,000 deduction available
• At $110,000 MAGI (single): deduction reduced by $2,000 → max $8,000
• At $125,000 MAGI (single): deduction reduced by $5,000 → max $5,000
• At $150,000 MAGI (single): deduction reduced by $10,000 → max $0 (fully phased out)

For MFJ filers, the same $200-per-$1,000 reduction applies starting at $200,000 MAGI:

• At $200,000 MAGI (MFJ): full $10,000 deduction available
• At $220,000 MAGI (MFJ): deduction reduced by $4,000 → max $6,000
• At $250,000 MAGI (MFJ): deduction reduced by $10,000 → max $0 (fully phased out)

The MFS trap: If you are married, you must file jointly to claim this deduction. Married filing separately is explicitly excluded. This is one of several OBBBA deductions that require joint filing, which creates a planning consideration for couples who file separately for student loan repayment or other reasons.

Lease vs. Purchase: Why Leases Do Not Qualify

Section 163(h)(4)(E) applies to "interest on any loan" used to purchase a qualified motor vehicle. A lease is not a loan. When you lease a vehicle, you do not own it — the leasing company does. The monthly payment includes a depreciation component and a money factor (the lease equivalent of interest), but the money factor is not deductible interest under Section 163(h)(4)(E).

This distinction matters because approximately 20-25% of new vehicle transactions are leases. If you leased a new US-assembled vehicle in 2025 or 2026, the interest-equivalent portion of your lease payment does not qualify. There is no workaround, no election, and no alternative calculation.

What about a lease buyout? If you exercise your purchase option at the end of a lease and finance the buyout with a loan, the vehicle is no longer "new" at that point. It is a used vehicle — you have been driving it for two or three years. Used vehicles do not qualify. The buyout loan interest is not deductible under Section 163(h)(4)(E).

Refinancing Rules

If you refinance your original auto loan, the interest on the refinanced loan generally continues to qualify — as long as the refinanced amount does not exceed the remaining balance of the original qualifying loan. If you do a cash-out refinance (borrowing more than the remaining balance), only the interest attributable to the original loan balance qualifies. The interest on the excess cash-out portion does not.

Example: You purchased a qualifying vehicle with a $45,000 loan. After 18 months, the balance is $38,000. You refinance for $38,000 at a lower rate. All interest on the refinanced loan qualifies. If you instead refinanced for $45,000 (taking $7,000 cash out), only the interest attributable to $38,000 qualifies. You would need to allocate interest proportionally: ($38,000 / $45,000) x total interest paid = qualifying interest.

Business vs. Personal Use Allocation

Section 163(h)(4)(E) is a personal interest deduction. If you use the vehicle partly for business and partly for personal purposes, you need to allocate.

If you claim the vehicle on Schedule C (business use):

• Business-use interest is deductible as a business expense under Section 163 (separate from Section 163(h)(4)(E))
• Personal-use interest is potentially deductible under Section 163(h)(4)(E)
• You must maintain a mileage log or other records to support the allocation

Example: Your qualifying vehicle is used 70% for personal and 30% for business. Total loan interest for the year is $4,000. Business portion ($1,200) is deducted on Schedule C. Personal portion ($2,800) is deductible on Schedule 1-A under Section 163(h)(4)(E), subject to the $10,000 cap and income phaseouts.

The catch: If you claim the vehicle 100% for business using Section 179 or MACRS depreciation, none of the interest qualifies under Section 163(h)(4)(E). The entire interest amount is a business expense on Schedule C (or Form 4562 for depreciation). Section 163(h)(4)(E) only covers the personal-use portion.

For a deeper dive on business vehicle deductions, see my Section 179 and Bonus Depreciation in NJ guide.

Where to Claim It: Schedule 1-A, Part IV

The car loan interest deduction is claimed on Schedule 1-A (Form 1040), Part IV. Schedule 1-A is the new schedule created by the OBBBA to house all of the Act's above-the-line deductions. It is separate from Schedule 1 (Additional Income and Adjustments to Income), which continues to exist for pre-OBBBA deductions.

For the full walkthrough of Schedule 1-A and all four parts, see my Schedule 1-A Guide.

What you need to file:

• Form 1098 or year-end interest statement from your lender showing interest paid
• Documentation of the vehicle's final assembly location (window sticker, VIN decode printout)
• Purchase agreement showing the vehicle was new
• Mileage log if you split business/personal use

The deduction flows from Schedule 1-A to Form 1040, reducing your AGI before you calculate taxable income. Because it reduces AGI, it can also improve your eligibility for other AGI-based tax benefits (education credits, IRA deduction limits, etc.).

NJ Non-Conformity: Why This Deduction Does Not Exist on Your State Return

New Jersey does not conform to IRC Section 163(h)(4)(E). This is the single most important fact for NJ residents reading this guide, and it is the fact that every national article about the car loan interest deduction omits.

New Jersey has never allowed a deduction for personal consumer interest. Before the Tax Reform Act of 1986, federal law allowed personal interest deductions (mortgage, car loans, credit cards). The 1986 act repealed most personal interest deductions federally. New Jersey went further — the state has never recognized personal interest as deductible for NJ Gross Income Tax purposes, and NJ did not adopt the OBBBA's revival of a limited personal interest deduction.

What this means in practice:

• Your federal return shows the Section 163(h)(4)(E) deduction on Schedule 1-A
• Your NJ-1040 does not recognize this deduction
• Your NJ taxable income is higher than your federal AGI by the amount of the Section 163(h)(4)(E) deduction
• At NJ's marginal tax rates (5.525% to 10.75% for high earners), this creates real dollar differences

For a complete analysis of which OBBBA deductions NJ does and does not follow, see my NJ OBBBA Conformity Guide.

Worked example (NJ resident):

Sarah, a single filer in Livingston, NJ, earns $90,000 and pays $3,200 in interest on her qualifying new Honda CR-V (assembled in East Liberty, OH). She claims the full $3,200 on her federal Schedule 1-A. Her federal AGI drops from $90,000 to $86,800. At the 22% federal bracket, she saves approximately $704 in federal tax. On her NJ-1040, the $3,200 deduction does not exist. Her NJ taxable income remains based on the higher amount. At NJ's 5.525% rate for her bracket, she pays approximately $177 more in NJ tax than she would if NJ conformed. Net benefit: approximately $527.

Worked Examples at Different Income Levels

Example 1: Single Filer, $75,000 MAGI

• Vehicle: 2026 Toyota Camry (assembled in Georgetown, KY)
• Loan: $35,000 at 7.0%, first full year of payments
• Interest paid: approximately $2,450
• Phaseout: none (below $100,000 threshold)
• Federal deduction: $2,450
• Federal tax savings at 22%: approximately $539
• NJ tax savings: $0 (NJ does not conform)

Example 2: Married Filing Jointly, $180,000 MAGI

• Vehicle: 2026 Hyundai Palisade (assembled in Ulsan, South Korea)
• This vehicle does NOT qualify — assembled outside the US
• Federal deduction: $0
• Lesson: always check the VIN before relying on this deduction

Example 3: Married Filing Jointly, $225,000 MAGI

• Vehicle: 2026 Ford F-150 (assembled in Dearborn, MI)
• Loan: $55,000 at 6.5%, first full year of payments
• Interest paid: approximately $3,575
• Phaseout calculation: MAGI exceeds $200,000 by $25,000 → reduction of $5,000
• Maximum deduction after phaseout: $10,000 - $5,000 = $5,000
• Actual interest ($3,575) is below the phased-out cap ($5,000)
• Federal deduction: $3,575
• Federal tax savings at 24%: approximately $858
• NJ tax savings: $0

Example 4: Single Filer, $145,000 MAGI

• Vehicle: 2026 Tesla Model Y (assembled in Austin, TX)
• Loan: $48,000 at 6.0%
• Interest paid: approximately $2,880
• Phaseout calculation: MAGI exceeds $100,000 by $45,000 → reduction of $9,000
• Maximum deduction after phaseout: $10,000 - $9,000 = $1,000
• Actual interest ($2,880) exceeds phased-out cap ($1,000)
• Federal deduction: $1,000
• Federal tax savings at 24%: approximately $240
• NJ tax savings: $0
• Note: at $150,000 MAGI, the deduction would be fully phased out ($0)

Example 5: Single Filer, $95,000 MAGI, Two Vehicles

• Vehicle 1: 2026 Chevrolet Silverado (assembled in Fort Wayne, IN) — $2,100 interest
• Vehicle 2: 2026 Subaru Outback (assembled in Lafayette, IN) — $1,800 interest
• Combined interest: $3,900
• Cap: $10,000 (not exceeded)
• Federal deduction: $3,900
• Federal tax savings at 22%: approximately $858

Frequently Asked Questions