10th Digit VIN Number Chart: What It Means and How to Read It

Every Vehicle Identification Number (VIN) tells a story — and the 10th digit tells you exactly when that story began. If you've ever needed to confirm a vehicle's model year for registration, insurance, parts ordering, or a title transfer, knowing how to read the 10th digit is one of the most practical skills you can have.

What Is a VIN and Where Do You Find It?

A VIN (Vehicle Identification Number) is a 17-character code assigned to every motor vehicle manufactured for sale. It's unique to each vehicle — no two vehicles share the same VIN within a 30-year span.

You'll find the VIN in several places:

• Dashboard, visible through the windshield on the driver's side
• Driver's side door jamb (on a sticker)
• Vehicle title and registration documents
• Insurance cards and policy documents
• Engine block (on older vehicles)

Each of the 17 characters has a specific meaning, and the 10th digit is the model year code.

The 10th Digit VIN Model Year Chart 📋

The Society of Automotive Engineers (SAE) and the National Highway Traffic Safety Administration (NHTSA) established a standardized VIN system in 1981. The model year code cycles through a defined set of letters and numbers — skipping certain characters to avoid confusion.

Letters and numbers not used: I, O, Q (too easily confused with 1, 0, and 0), U, and Z.

The sequence repeats every 30 years, which is why the same letter can represent two different model years (for example, B = both 1981 and 2011). For any vehicle built after 1981, context and the vehicle's general age will make the correct year clear.

Model Year vs. Calendar Year: An Important Distinction

The model year encoded in the VIN is not always the same as the calendar year the vehicle was built or sold. Manufacturers typically begin producing the next model year's vehicles mid-way through the prior calendar year — often as early as January or February.

This matters for a few reasons:

• Registration and taxes: Some states base annual registration fees or personal property taxes on model year. A vehicle purchased in late one calendar year may carry the following model year designation, affecting what you owe.
• Parts compatibility: When ordering replacement parts, the model year from the VIN — not the purchase date — is what parts suppliers and mechanics use.
• Insurance: Insurers use the model year to assess vehicle value and set premiums. A 2025-model-year vehicle bought in late 2024 is rated as a 2025.
• Recall and TSB lookups: NHTSA's recall database and manufacturer technical service bulletins (TSBs) are indexed by model year. Using the VIN's 10th digit ensures you're looking at the right records.

What the Other VIN Digits Tell You

While the 10th digit is the model year, the rest of the VIN carries its own meaning:

| VIN Position | What It Encodes | |:-:|:-| | 1–3 | World Manufacturer Identifier (WMI) — country and manufacturer | | 4–8 | Vehicle Descriptor Section — body style, engine, series | | 9 | Check digit — used to verify VIN authenticity | | 10 | Model year | | 11 | Plant where the vehicle was assembled | | 12–17 | Production sequence number (unique per vehicle) |

The 9th digit (check digit) is particularly useful when verifying a VIN's legitimacy — a common step in used vehicle purchases and title transfers.

Why This Matters for DMV and Registration Processes 🚗

State DMVs rely on the VIN — including the 10th digit — to verify vehicle information during:

• Title transfers between buyers and sellers
• Registration renewals, especially when fees are tied to vehicle age
• Smog and emissions testing, which often has different thresholds by model year
• Salvage and rebuilt title inspections
• Out-of-state vehicle registrations, where the DMV may run an independent VIN verification

Requirements, fees, and processes vary significantly by state. How a specific model year affects your registration cost, emissions requirements, or inspection obligations depends entirely on where you're registering the vehicle and what type of vehicle it is.

When the 10th Digit Doesn't Tell the Whole Story

For pre-1981 vehicles, no standardized 17-digit VIN system existed. Older vehicles used manufacturer-specific numbering systems that varied in length and format — meaning the 10th-digit rule simply doesn't apply to classic cars and antiques built before the standardized system took effect.

For those vehicles, confirming the model year typically requires manufacturer-specific decoding resources, documentation from the original title, or in some cases, a certified vehicle inspection.

Your vehicle's VIN, its state of registration, its specific use type, and the year it was manufactured are the factors that determine what the 10th digit ultimately means for your paperwork, your taxes, and your ownership costs.