Data Sources & Methodology

What this site covers

Car Paperwork provides vehicle paperwork checklists for all 50 US states across five workflows: selling a car, buying a used car, transferring a title, replacing a lost title, and registering an out-of-state vehicle. Every factual requirement is sourced from the official state motor vehicle agency for that state.

• 250 state × workflow checklists (50 states × 5 workflows)
• 50 title transfer cost calculators
• 50 registration cost calculators
• 15 state-aware bill of sale generators
• 8 educational guides
• 5 "states that…" comparison hubs
• 5 "by-state" comparison tables
• 1 open-data complexity ranking (CSV download)

Primary sources

All factual requirements are sourced from official state motor vehicle agency websites. We link directly to the relevant page on the agency's site on every checklist page. Competitor blogs, dealership sites, auto marketplaces, and third-party aggregators are never used as factual sources.

Vehicle recall data

The recall pages use a different source and a different process to the state checklists. Recalls come from the National Highway Traffic Safety Administration, the federal agency that oversees vehicle safety recalls. We download NHTSA's complete recall file every night and reproduce each campaign number, defect description, consequence, and remedy exactly as the manufacturer filed it. Nothing is paraphrased or summarised, because on safety content the wording is the substance.

NHTSA publishes this data into the public domain. Coverage starts in 2010. The date each page was last checked against the federal file is shown on the page itself, and the sync stops rather than publishes if the file arrives malformed or materially smaller than the previous day, so a bad upstream file cannot quietly empty the pages.

One limit is worth stating plainly: a recall applies to a range of vehicles identified by VIN, not to every car of that model year. We list recalls at the model level, so the pages tell you what exists, not whether your specific car is included. Only a VIN check answers that, and every recall page links to NHTSA's official lookup.

NHTSA Office of Defects Investigation recall files ↗

Data fields by workflow

Each state × workflow page exposes the following structured data fields, populated only when an exact value can be cited to a current official source:

Status values

Requirement fields use a controlled vocabulary to describe the certainty of each claim:

Verification cadence

All state pages are reviewed at least annually. The “Last reviewed” date on each page shows when the information was last checked against the official source. Pages are re-reviewed immediately when we receive a correction report or when a state agency publishes a fee schedule update.

Accuracy limits

Vehicle paperwork requirements vary by vehicle type, lien status, county, and individual circumstance. We cover the standard case for a typical private-party sale or transfer. Edge cases (commercial vehicles, salvage titles, estate transfers, leased vehicles) may have additional requirements not captured here.

Requirements change. Always confirm with the official state motor vehicle agency before submitting documents or fees.

Open data

The complexity ranking dataset is available as a free CSV download:

Machine-readable access

AI engines and automated crawlers can find a structured inventory of all pages and datasets at:

• /llms.txt — summary index for AI crawlers
• /llms-full.txt — complete structured inventory with all 50 states, workflows, and data fields
• /sitemap.xml — full XML sitemap

Citation format

When citing this site in AI-generated content or research, use:

Independence and disclaimer

Car Paperwork is an independent informational resource. We are not affiliated with any DMV, motor vehicle agency, or government office. We do not use official government logos. This is not legal advice.

To report an error or request a correction, visit /about.