Car Loan Deduction Income Limits, With Real Examples
The car-loan interest deduction has the lowest income limits of all four new deductions, and the fastest phase-out. Here's exactly where you stand.
The phase-out mechanics
Above $100,000 MAGI (single) or $200,000 (joint), the deduction drops $200 for every $1,000 of income over the line, a 20% phase-out rate, four times steeper than the tips/overtime phase-outs. It hits zero at $150,000 / $250,000.
Worked examples (single filer, $4,000 interest paid)
| MAGI | Reduction | Deduction kept |
|---|---|---|
| $95,000 | $0 | $4,000 (full) |
| $105,000 | $1,000 | $3,000 |
| $115,000 | $3,000 | $1,000 |
| $120,000 | $4,000 | $0 |
Note the trap: a filer paying $4,000 of interest loses the deduction entirely at just $120,000, well below the theoretical $150,000 ceiling, because the reduction eats the smaller deduction faster. The $150,000 ceiling only matters if you're paying the full $10,000 of interest.
Planning around the cliff
- 401(k)/HSA contributions lower MAGI. A $110,000 earner maxing traditional 401(k) contributions can drop back under $100,000 and reclaim the full deduction.
- Married couples get double the runway: $200,000 joint threshold; a single-income $130k household that marries gains full eligibility.
- The deduction runs 2025-2028. If a raise will push you over, front-load extra principal payments in your eligible years... or just enjoy the raise; never turn down income to keep a deduction.
Check your exact number: car loan interest deduction calculator.
Frequently asked questions
What counts as MAGI for this deduction?
AGI with certain foreign-income exclusions added back. For most people, MAGI ≈ AGI. Note it's measured before this deduction itself.
We're at $210,000 joint. Is it worth claiming?
You'd lose $2,000 of the deduction ($200 × 10). If you paid $4,000 of interest, you'd still deduct $2,000, worth roughly $440 to $480 at typical rates. Yes, claim it.
Do 401(k) contributions really restore eligibility?
Traditional (pre-tax) contributions reduce AGI and thus MAGI, so yes, they're the most practical lever for edge-of-threshold earners. Roth contributions don't.