Is Vehicle Property Tax Deductible? What It Is Worth in California and Washington

By Kevin Luu, Co-Founder and Chief Learning Officer. Reviewed on 2026-09-30.

Yes, vehicle property tax is deductible on your federal return, but only the part of the bill that is based on the car’s value, only if it is charged every year, and only if you itemize. It counts toward the state and local tax (SALT) deduction, and for 2026 a married couple with modified adjusted gross income above about $606,333 has a SALT cap of $10,000. At $750,000 or more, California income tax or Washington property tax on your home usually fills that cap already, so the car tax often adds nothing federally.

The useful question for a high-income family in California or Washington is not “is it deductible” but “is it worth anything to us.” Below is how the rule works, what qualifies in each state, and two worked examples at real income levels.

The IRS test for a deductible car tax

The IRS lets you deduct personal property taxes on Schedule A, line 5c, only if the tax is “based on value alone” and “imposed on a yearly basis”. If a registration bill mixes a value-based charge with flat fees or weight fees, only the value-based part counts. The Schedule A instructions give exactly that example: a yearly car registration fee partly based on value and partly on weight, where only the value part is deductible. Topic 503 adds that the tax must be charged on a yearly basis, even if it is collected more or less often than once a year.

Three conditions follow from that:

• You must itemize. For 2026 the standard deduction for married filing jointly is $32,200. Most families at this income itemize because of mortgage interest and charitable gifts, so this is usually met.
• The tax goes into the SALT bucket. It sits alongside state income tax (or sales tax, if you elect it) and real estate tax, and the whole bucket is capped.
• Only the value-based line counts. Registration fees, county fees, CHP fees and similar flat charges are not deductible.

Why the SALT cap decides the answer at $750,000+

For 2026 the federal SALT cap is $40,400 for joint filers, but it shrinks by 30% of modified adjusted gross income (MAGI) above $505,000 and never falls below $10,000 (P.L. 119-21, §70120). The math puts a joint return at the $10,000 floor once MAGI reaches about $606,333. A household earning $750,000 to $3 million in W-2 pay and RSU income is almost always there.

So the federal question becomes simple: are your other state and local taxes already above $10,000? If yes, an extra dollar of vehicle tax changes nothing on your federal return. If you are unsure what your MAGI is, our guide on which line is MAGI on Form 1040 walks through it.

What counts in California: the Vehicle License Fee

In California the deductible piece is the Vehicle License Fee (VLF). The DMV sets it at 0.65% of the purchase price or value of the vehicle, and it declines over the car’s first 11 renewal years. The FTB’s Form 540 booklet says you may deduct the VLF on federal Schedule A, while “the other fees listed on your billing notice such as registration fee, weight fee, and county fees are not deductible” (2025 Form 540 booklet). Your DMV renewal notice lists the VLF separately, and the DMV has a VLF calculator if you lost the notice.

California’s own return is where the VLF still earns something. California does not follow the federal SALT cap (2025 Schedule CA instructions, line 5e), and it does not let you deduct state income tax, SDI or sales tax on the state return at all. Property taxes, including the VLF, stay deductible on Schedule CA without a cap.

California does reduce itemized deductions for high earners. For 2025, joint filers with federal AGI above $504,411 lose the smaller of 6% of the excess or 80% of most of their itemized deductions (medical expenses, investment interest and casualty and gambling losses are left out of the 80% figure). Because the 6% reduction is driven by income, not by the size of your deductions, an extra dollar of VLF usually still lowers California taxable income by a full dollar.

What counts in Washington: the RTA excise tax

Washington’s registration bill includes a value-based tax only if you live inside the Sound Transit district in King, Pierce or Snohomish County. That Regional Transit Authority (RTA) motor vehicle excise tax is 1.1% of the vehicle’s depreciated value, based on MSRP and a depreciation schedule. Sound Transit’s own FAQ says it meets the IRS test because it is based on value, imposed annually and imposed on personal property (Sound Transit MVET FAQ). The flat tab fees on the same bill do not qualify.

Washington has no wage income tax for 2026, so there is no state return where the RTA tax helps. Washington families usually elect the sales tax deduction instead of income tax inside the SALT bucket. That is a choice, not a second bucket: it shares the same $10,000 cap.

Worked example 1: a $900,000 household in San Mateo

Assumptions (illustrative): married filing jointly, $900,000 of W-2 and RSU income, two cars bought in 2026, an $85,000 SUV and a $50,000 sedan, so the VLF is figured on the full purchase price (it declines in later renewal years). California taxable income of about $840,000.

The honest answer for this family: yes, it is deductible, and it is worth about $90 a year, all of it on the California return. Your preparer should still enter it, but it does not justify any decision about which car to buy or whether to lease.

Worked example 2: a $1.2 million household in Redmond

Assumptions (illustrative): married filing jointly, $1.2 million of W-2 and RSU income, living inside the Sound Transit district, one car with a depreciated value of $60,000.

• RTA tax: $60,000 × 1.1% = $660.
• Federal SALT cap for 2026: $10,000.
• If they own their home: property tax on an Eastside house commonly fills the $10,000 cap on its own. The $660 adds nothing federally, and Washington has no income tax return to use it on.
• If they rent and still itemize (for example because of large gifts to a donor-advised fund): their SALT bucket is only sales tax plus the RTA tax, which may stay under $10,000. Then the $660 is deductible against income taxed at 37% (the 2026 bracket starts at $768,700 of taxable income). From 2026, though, itemized deductions for 37%-bracket filers are reduced by 2/37 (P.L. 119-21, §70111), so each deductible dollar typically saves about 35 cents. The $660 is worth about $231.

From 2028 Washington adds a 9.9% income tax on AGI over $1,000,000 (WA DOR). For a family like this one, that new tax would sit in the same SALT bucket, which makes it even less likely that the RTA tax adds federal value after 2028.

The parental leave year: when the cap opens up

The one time the SALT cap moves for a family at this level is a lower-income year: a spouse on unpaid leave after a new baby, a sabbatical, or a gap between jobs. If MAGI drops to $560,000 in 2026, the cap becomes $40,400 minus 30% of $55,000, or $23,900. In California, state income tax at that income is typically enough to fill even the higher cap, so the VLF still rarely matters. In Washington, a homeowner’s property tax plus the RTA tax may now fit under it. It is worth asking your preparer to rerun the SALT worksheet in any year your income drops.

Common mistakes we see

• Deducting the whole registration bill. Only the VLF (California) or RTA tax (Washington) qualifies.
• Assuming the old $10,000 cap rose for everyone. The $40,400 cap for 2026 phases back down to $10,000 for most families at this income.
• Forgetting the California return. The VLF can be worth nothing federally and still reduce California tax.
• Counting on the new car loan interest deduction. It allows up to $10,000 a year for 2025 through 2028, but it is reduced by $200 for each $1,000 of MAGI above $200,000 on a joint return, so it is gone at $250,000 (IRS; P.L. 119-21, §70203).

What to write down for your kids

A $90 deduction is not the lesson. The lesson is how you decided which car to buy, how long you keep cars, and why you paid cash, financed or leased. A one-page Decision Memo on your next car purchase gives your children a real example of trade-offs they will face themselves at 25. Conversations fade. Documentation compounds.

Questions families ask

Is the California registration fee deductible?

Only the Vehicle License Fee portion is, at 0.65% of the car’s purchase price or value. The FTB states the registration fee, weight fee and county fees on the same DMV notice are not deductible. On the federal return it falls under the SALT cap; on the California return it is deductible without a cap, subject to the high-income limit on itemized deductions.

Can I deduct the sales tax I paid on a new car?

Federally, only if you itemize and elect sales tax instead of state income tax, and the amount still falls inside the SALT cap. In California, state income tax is almost always larger, so the election rarely helps, and California’s own return does not allow a sales tax deduction. Washington families more often use the sales tax election, but the cap still applies.

Is Washington’s car tab fee deductible?

Only the RTA motor vehicle excise tax, which applies inside the Sound Transit district at 1.1% of depreciated value. Flat tab and filing fees are not. Whether it saves money depends on whether your other state and local taxes, mainly home property tax, already reach the $10,000 federal cap for 2026.

Next step

Pull last year’s DMV or DOL renewal notice and check that your preparer entered only the value-based line, on both the federal and California returns. If you want to see how itemized deductions, the SALT cap and RSU income fit together for your family, our tax management page explains how Age Five Family Office™ handles it, and our guide on reducing modified adjusted gross income covers the levers that move MAGI. For how deductions interact with MAGI, see does the standard deduction reduce MAGI. Families who want the car decision written down for their kids can start with our family governance work. This is general education, and the right move depends on your family’s full picture.

Written by

Kevin Luu

Co-Founder and Chief Learning Officer, Bright Advisers

Kevin has advised high-income W-2 tech and biotech families since 2015, and leads the education-first Age Five Family Office from Brea, California.

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