Methodology & data sources

Anyone can run a depreciation formula. The harder, more valuable part is the state-specific legal facts: the vehicle sales-tax rate, the annual registration fee schedule, whether the state levies a personal property tax on vehicles, and inspection requirements. Those come from statutes and official agency schedules, not guesses, so we treat them with care and show our work.

Where each figure comes from

• Vehicle sales-tax rates: each state's Department of Revenue or taxation authority and the underlying statute.
• Annual registration fees: each state's DMV or Department of Motor Vehicles published fee schedule.
• Vehicle personal property tax: state revenue department rules governing which counties or municipalities levy the tax and the applicable rate method.
• Vehicle inspection requirements: each state's DMV or equivalent safety and emissions authority.
• Title fees: state DMV published schedule.
• Calculator starting figures: editable examples, not sourced industry averages or model-specific quotes. The single-car examples include $1,800/year insurance, $900/year maintenance (with $500 and $1,500 alternatives), 20% first-year depreciation and 15%/year thereafter. Sample vehicle prices, efficiency, energy prices and financing terms are also illustrative. Replace them with your own assumptions; no dataset or source date is claimed for these examples.

How calculator assumptions work

The calculator uses your entered values. Selecting a state adds location context; it does not import the state-page fee schedule. Blank tax or fee inputs remain unknown and are excluded from an incomplete subtotal. Entering zero is an explicit assumption, not verification that a fee does not apply.

Comparisons share annual mileage, financing and tax/fee assumptions. Each car can use its own five-year resale estimate, from zero to its purchase price. Otherwise, the default curve reduces the remaining vehicle value each year. A resale override replaces that curve, and the total value lost is spread evenly over five years for the annual breakdown. Those intermediate values are an allocation, not yearly market forecasts. Changing resale changes economic cost and ending equity, but does not change loan payments or cash paid.

Actual registration, property tax and other charges can differ by vehicle. Check the shared assumptions against each car's written quotes and local requirements before relying on the comparison. Source records and review dates on data pages apply to those records, not to your calculator scenario.

The data gate: verified vs. estimated

Every state record carries a verified flag and the date we last checked it against the official source. This drives a hard rule built into the build itself:

• Source-verified records show a badge with the citation, the official source link, and the date we confirmed it. These pages are indexable.
• Estimated records show an amber "not yet source-verified" badge. Those pages are noindexed and excluded from our sitemap, so an unconfirmed figure can never rank in search as authoritative.

As of June 2026, all 51 state records are source-verified against official motor-vehicle or revenue sources.

How often we review

States adjust DMV fees and tax rates, usually around their legislative cycles. We re-review the dataset at least annually and monitor known changes in between. Even so, fees can change between our review date and when you're reading this, which is why every page says to confirm the current amount with your state DMV or a licensed professional before purchase.

What we don't do

We don't rely on Wikipedia, unsourced blogs, or AI-generated numbers for any verified figure. We don't scrape or copy competitor data. And we don't claim expertise we don't have: CarOutlay publishes estimates and general information, not financial or legal advice for your specific situation.

Partner relationships

When we link to a partner (for example, to compare insurance quotes or refinance rates), it's a clearly-labeled outbound link to the partner's own site, and we may earn a flat referral fee if you use it. A partner relationship never changes a data figure, a ranking, or what we estimate. See how we make money for the full disclosure.