EV Loan Interest Deduction Calculator (OBBBA)

How this calculator works

OBBBA EV Loan Interest Deduction — rules implemented

Under the One Big Beautiful Bill Act (OBBBA), signed July 4, 2025, buyers of qualifying new vehicles can deduct up to $10,000 per year in loan interest. Key rules:

• Vehicle requirements: New (not used or leased) personal-use vehicle under 14,000 lbs gross vehicle weight with final assembly in the United States.
• Deduction mechanism: Above-the-line deduction — available whether or not you itemize.
• Availability window: Purchases from January 1, 2025 through December 31, 2028.
• VIN reporting: You must report the vehicle identification number on your tax return.
• MAGI phase-out:
  • Single filers: full deduction up to $100,000 MAGI; reduces by $200 for every $1,000 over; fully phased out at $150,000.
  • Married filing jointly: full deduction up to $200,000 MAGI; reduces by $200 for every $1,000 over; fully phased out at $250,000.

Calculation

1. Eligibility check — vehicle must be new, U.S. assembled, under weight limit, personal use, purchased within eligibility window.
2. Phase-out — phaseOutReduction = max(0, (MAGI − phaseOutStart) ÷ 1000 × 200). The maximum deduction is reduced by the phase-out amount. If MAGI ≥ phase-out ceiling, deduction = $0.
3. Annual interest estimate — uses the standard loan amortization to estimate interest paid in each year of the loan.
4. Annual deduction — for each year, deduction = min(annual interest paid, max annual deduction after phase-out, $10,000).
5. Tax savings — approximate federal tax savings = deduction × your marginal federal tax bracket (you provide your bracket; this is not tax calculation, just a rough estimate of value).

Locked-in old credit mode

If you signed a binding written purchase contract and made a qualifying payment on or before September 30, 2025, you may still claim the old Clean Vehicle Credit (up to $7,500 new or $4,000 used) even if you took delivery later. This mode checks whether your situation qualifies for the exception — it does not replace professional tax advice.

What this calculator does not do

• Calculate your full federal tax liability
• Account for state-level EV incentives (see our State EV Incentive Lookup)
• Verify the VIN-level assembly location of a specific vehicle
• Validate eligibility for the Section 30C home charger credit (use our separate Home EV Charger Credit Calculator)

The 2026 federal EV tax landscape in plain English

The federal incentives for buying an electric vehicle changed fundamentally in 2025. If you are shopping for an EV in 2026 and you remember the old $7,500 tax credit, here is what actually applies now.

What changed

The Inflation Reduction Act's $7,500 new EV credit (IRC Section 30D) and $4,000 used EV credit (IRC Section 25E) both expired on September 30, 2025. They were replaced by a new benefit under the One Big Beautiful Bill Act (OBBBA), signed into law on July 4, 2025.

The replacement is structured completely differently from the credit it replaced. The old credit was a one-time point-of-sale discount or tax credit. The new benefit is an annual deduction on the interest you pay on your car loan — it repeats every year you are paying down the loan, through 2028.

Who qualifies for the OBBBA deduction

• Buyers with modified adjusted gross income (MAGI) under $100,000 (single) or $200,000 (married filing jointly) qualify for the full deduction. The benefit phases out between those thresholds and $150,000 / $250,000 respectively.
• Vehicles must be new (not used, not leased), have final assembly in the United States, be under 14,000 pounds gross vehicle weight, and be used for personal purposes.
• Purchase date must fall between January 1, 2025 and December 31, 2028.

How to verify U.S. final assembly

The most reliable check is the Monroney sticker on the vehicle's window. Look for the "Parts Content Information" section — it will list "Final Assembly Point" with a city and state. For OBBBA eligibility, this must be a U.S. location. You can also decode the VIN: the first character indicates the country of final assembly (1, 4, and 5 are United States).

How the phase-out works

If your MAGI exceeds the threshold, your maximum deduction reduces by $200 for every $1,000 you are over. For example, a single filer with $125,000 MAGI is $25,000 over the $100,000 threshold, so their deduction cap drops by $5,000 — to a maximum of $5,000 per year. At $150,000 and above, single filers receive no deduction.

The lock-in exception for the old credit

If you signed a binding written purchase contract and made a qualifying payment on or before September 30, 2025, you can still claim the old $7,500 new EV credit or $4,000 used EV credit, even if you took delivery of the vehicle after that date. To claim it you will need: (1) the binding contract dated on or before September 30, 2025, (2) proof of payment from that date, and (3) a time-of-sale report from the dealer. File with IRS Form 8936.

If you did not lock in a contract by that date, the old credits are no longer available regardless of when you take delivery.

Stacking with state and utility incentives

The OBBBA deduction stacks with state tax credits, state rebates, and utility rebates. In states like California, Colorado, and New York, combining federal and state-level benefits can still produce meaningful purchase-time savings. Check our State EV Incentive Lookup for what applies where you live.

Important caveat

Tax rules change and interpretations evolve. This calculator reflects federal law as of April 16, 2026. Consult a qualified tax professional before making purchase decisions based on expected tax benefits. The IRS has not yet issued all the procedural guidance around the new deduction, so specifics may shift.