Car Loan Interest Deduction Rules Took Effect Nov. 9, Capped at $10,000

• Final Treasury and IRS regulations for the car loan interest deduction took effect on Nov. 9, 2026, and cover loans taken out after Dec. 31, 2024 for tax years beginning before Jan. 1, 2029.
• The deduction tops out at $10,000 a year per return and shrinks by $200 for every $1,000 of modified adjusted gross income above $100,000 ($200,000 on a joint return).
• Used cars, vehicles with foreign final assembly, leases and the negative equity rolled over from a trade-in all fall outside the deduction.

Which New-Car Loan Interest Comes Off Your Taxable Income

Treasury and the IRS published the final regulations in the Federal Register on Sept. 8, 2026, and they became effective on Nov. 9. A buyer who financed a new vehicle with U.S. final assembly after Dec. 31, 2024 can deduct up to $10,000 of the interest on that loan each year, whether or not the buyer itemizes. The deduction applies to tax years beginning after Dec. 31, 2024 and before Jan. 1, 2029, which means 2025 through 2028 returns for calendar-year filers.

Congress created the deduction in section 70203 of the One, Big, Beautiful Bill Act (Public Law 119-21), signed July 4, 2025. The agencies drafted the regulations after 63 public comments and a Feb. 24, 2026 hearing at which three speakers testified, and they turned down requests to widen the deduction. Loans signed in late 2024 stay out, and so do used and nearly new cars. Negative equity stays out as well. Head of household filers keep the $100,000 threshold.

The rules also settle the awkward cases: trade-ins with debt, several loans, a refinance, a lease buyout. Each case below carries the dollar figures from the regulations.

How the $200 Phase-Out Cuts the Deduction

Two limits apply, and they apply in a set order. The $10,000 cap comes first. Then the income test takes a bite out of whatever remains deductible. For every $1,000 (or part of $1,000) that modified adjusted gross income, or MAGI, runs over $100,000, the deduction falls by $200. On a joint return the reduction starts above $200,000. Head of household filers use the $100,000 line, the same as single filers. The regulations state that filing status has no bearing on eligibility, only on that threshold.

One $10,000 limit applies to each return, whatever the filing status, so a married couple on a joint return shares a single limit. A household with several qualifying loans adds the interest from all of them first and applies the cap to the total.

These illustrations are computed from the rule, not taken from IRS tables. A single filer with MAGI of $120,000 and at least $10,000 of qualifying interest loses 20 steps of $200, or $4,000, and deducts $6,000. At MAGI of $120,500 the extra $500 counts as a full step, so 21 steps remove $4,200 and the deduction is $5,800. A joint filer with MAGI of $230,000 loses 30 steps, or $6,000, and keeps $4,000. A $10,000 deduction disappears entirely at $150,000 of MAGI for a single filer and $250,000 for a joint return. A smaller deduction vanishes sooner: a filer with $6,000 of qualifying interest reaches zero at $130,000, and at $120,000 that filer deducts $2,000.

A deduction lowers taxable income, so the tax it saves on a $6,000 deduction depends on the filer’s bracket. Buyers who want a sense of the size of the interest involved can start with the typical interest on a new-vehicle loan and then apply the cap and the phase-out above.

Which Vehicles and Loans Count

The vehicle must be a car, minivan, van, SUV, pickup truck or motorcycle with a GVWR (the maker’s gross vehicle rating) under 14,000 pounds. It must be new, which the regulations define as original use beginning with the buyer, and the loan paperwork must treat it as new. Treasury clarified that the lender’s own label for the car in its financing programs settles the question. A car built in a prior model year and sold later still qualifies, so a 2025 model bought in 2026 is eligible. A dealer demonstrator held mainly for sale generally still qualifies, while a dealer loaner used for the dealer’s own operations generally does not.

The loan needs an origination date after Dec. 31, 2024, a first lien on the vehicle as collateral and a personal purpose. Treasury defines the first lien as the earliest security interest a borrower voluntarily placed on the car, whatever tax or repair liens land later. A lien that is still waiting on title processing, or one removed after a repossession or a total loss insurance payout while the borrower still owes the debt, does not disqualify the loan. A credit card purchase does not qualify, and card debt is generally unsecured. Personal use is judged when the loan starts: the buyer needs to expect that the buyer, a spouse or a relative will use it for personal purposes more than half the time. A later change in how the car is used does not undo the deduction.

U.S. final assembly is the test that catches the most buyers. Treasury rejected requests to decide it by make and model, and it rejected an exemption for large U.S. manufacturers, as the same model can come from plants in different countries and a U.S. brand can build some cars abroad. Each vehicle gets checked on its own. Three proofs are available: the information label on the vehicle at the dealership (the window sticker), the plant of manufacture shown in the VIN, and the NHTSA VIN Decoder at nhtsa.gov/vin-decoder. The window sticker works if the website is down.

Leases never qualify, and neither does a lease buyout. The regulations walk through a customer who leases a car from a leasing company and buys it at the end of the term: original use began with the leasing company, so the buyer’s loan interest is not deductible.

Negative Equity, Add-Ons and Refinancing Eat Into the Interest

Negative equity is debt left on a trade-in that is larger than the trade-in is worth. Many commenters asked Treasury to let that debt count when it rolls into the new loan. Treasury refused: the debt belongs to the previous vehicle, and the interest attached to it is not deductible.

The regulations work the arithmetic in an example. A buyer purchases a $40,000 vehicle, trades in a car with $6,000 of negative equity and puts $4,000 down, which produces a $42,000 loan. The down payment is applied against the negative equity first, so $40,000 of the loan is a qualifying vehicle loan and $2,000 is not. Under the pro rata method in the rules, the qualifying share of every interest payment in that case is 40,000 divided by 42,000, or 95.2 percent. That percentage is an illustration computed from the two examples. In the second example in the rules, a $40,000 loan with $36,000 qualifying and $4,000 not allows 90 percent of each interest payment.

Add-ons stay in, which helps buyers. The final regulations expanded the list of items customarily financed with a vehicle purchase that count as part of the qualifying loan: service plans, extended warranties, sales taxes, vehicle fees, GAP insurance, tire, wheel, paint and interior protection products, replacement key fobs, and title and registration charges. Accessories that are components of the vehicle count too. Collision and liability insurance that is not credit insurance does not count, and neither does a trailer or boat rolled into the same deal.

A refinance keeps the deduction only up to the old balance. One example in the rules has a $38,000 refinance of a loan with a $30,000 balance, with $8,000 paid to the borrower in cash: only $30,000 is a qualifying loan, and none of the interest on the $8,000 is deductible. Extras added at the refinance, such as GAP insurance the buyer did not buy at the dealership, also fall outside. Adding a new borrower leaves the loan qualifying for the original borrower only. Accrued but unpaid interest that is rolled into the new loan can qualify.

Interest itself is defined broadly. It includes points and deferred or capitalized interest. Origination charges, prepayment penalties and late payment charges count when they are treated as interest for tax purposes and appear in the interest total on the lender’s statement.

What Lenders Report and What to Do Before You File

Section 6050AA of the tax code now requires any business that receives $600 or more of interest in a year on a qualifying vehicle loan to file an information return on Form 1098-VLI, Vehicle Loan Interest Statement. The $600 threshold is counted loan by loan. Lenders must give the borrower a written statement by Jan. 31 of the following year, so statements for interest paid in 2026 are due by Jan. 31, 2027. The statement lists the interest received, the principal outstanding at the start of the year, the origination date and the year, make, model and VIN of the vehicle, and it carries a legend that the borrower might be unable to deduct the full amount shown. For 2025 interest, the IRS accepted a statement of the total interest received under Notice 2025-57. Treasury declined to add more transition time and said lenders had roughly 18 months from the law’s enactment to prepare.

The general recordkeeping rules apply to borrowers, and Treasury added no special retention period. Five steps cover the preparation:

Start with the vehicle. Save the window sticker and run the VIN through the NHTSA decoder to confirm the assembly plant, and check that the GVWR is under 14,000 pounds. The VIN must appear on the return for every year the deduction is claimed.

Pull the loan contract next. Confirm the origination date is after Dec. 31, 2024, that the paperwork treats the vehicle as new, that the lender holds a first lien and that the purchase was for personal use.

Separate any negative equity from the amount financed, and ask the finance office which add-ons sit inside the loan. Use the pro rata rule to find the qualifying share of each interest payment.

Collect the lender’s interest statement, then estimate MAGI to see where the phase-out lands. The IRS points buyers to Publication 6126, Purchased a new vehicle?, for more detail. Buyers who want the filing mechanics can also read the earlier guide on claiming the car loan interest deduction.

Finally, think twice before refinancing for cash. Any amount borrowed above the old balance loses the deduction, and so does any add-on bought at the refinance. The deduction runs out with tax years beginning after Dec. 31, 2028, so the final year to claim it is 2028.

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Sources

• Internal Revenue Service: Purchasing a new vehicle? Car loan interest could be eligible for a tax deduction (IRS Tax Tip 2026-79)
• Federal Register: Car Loan Interest Deduction, final regulations (2026-18219)

Reviewed by Preetam Gadekar