The California dealer REG 51 Report of Sale is more than a temporary operating document—it’s a controlled DMV form that drives your registration clock, supports your liability protection, and is a common focus area during DMV audits. This guide (based on Dealer Educator training and the DMV Vehicle Industry Registration Procedures Manual) explains when a sale is “consummated,” the five-calendar-day deadline to send the dealer notice to DMV headquarters, and simple internal controls that help prevent Administrative Service Fees (ASF) and cleanup work.

What is the REG 51 (Report of Sale—Used Vehicle)?

California licensed dealers must report the retail sale of used vehicles on the Report of Sale—Used Vehicle (REG 51). The DMV describes REG 51 as a controlled form that dealers obtain through DMV Occupational Licensing (not a standard over-the-counter form). The REG 51 is used for retail used vehicle sales (not wholesale dealer-to-dealer sales, and not vessel sales). DMV—Report of Sale (Used Vehicles): General Information

When is a sale “consummated” for REG 51 timing?

For REG 51 purposes, the “date sold” is tied to consummation. DMV guidance ties the date sold to when the buyer:

• Paid the purchase price,
• Signed a purchase contract or security agreement, and
• Took possession or delivery of the vehicle.

This definition matters because it starts the clock for your dealer notice mailing requirement. DMV—REG 51 General Information

The 5-calendar-day REG 51 deadline (dealer notice portion)

Dealers and lessor-retailers must give written notice of the transfer by sending the dealer notice portion (the stub/carbon copy notice of sale) to DMV headquarters in Sacramento no later than the end of the fifth calendar day, not counting the date of sale. DMV also notes the dealer notice is mailed to the address shown on the REG 51 and is not submitted to a field office. DMV—REG 51 General Information

Practical tip: treat REG 51 like a daily “mail-out” control

In Dealer Educator compliance training, a best practice is to run REG 51 dealer notices like bank deposits: built into a daily process with a cut-off time, a log, and a second-person check. The goal is to avoid “we’ll mail it later” drift—because the deadline is calendar-based, weekends and holidays still count.

Complete REG 51 clearly—and use it in numerical sequence

DMV expects the vehicle description and purchaser information to be clearly and accurately shown on all parts of the REG 51. The REG 51 must be used in numerical sequence, and information may be typed, computer-generated, or hand printed (DMV expresses a preference for block upper-case letters when hand printed). DMV—REG 51 General Information

Why numerical sequence matters in an audit

Using REG 51s in order creates an easy reconciliation trail. Gaps (missing numbers), duplicates, or out-of-order use can raise questions such as:

• Was a sale reported late or not reported?
• Was a form voided properly?
• Did a vehicle leave inventory without proper paperwork control?

Administrative Service Fees (ASF): what triggers them?

ASF is a DMV penalty imposed on dealers or lessor-retailers for violations tied to California Vehicle Code requirements. The DMV’s industry procedures manual summarizes common ASF triggers and timeframes, including:

• $5 for failing to submit the dealer notice portion to DMV headquarters within five calendar days after (but not including) the date of sale.
• $5 for failing to submit the application and fees due within 20 days (new vehicles) or within 30 days (used vehicles) of the sale date.
• $25 for failing to clear an application within required timeframes (new: 40 days from sale or 20 days after DMV first returned the application; used: 50 days from sale or 30 days after DMV first returned the application—whichever is later).

DMV—Vehicle Industry Registration Procedures Manual (REG 51 / reporting rules)

Returned applications: the hidden ASF risk

Many “late” problems start as correctable errors (VIN mismatches, missing signatures, incomplete supporting forms). Once DMV returns an application, the clock to resubmit and clear is shorter—and that’s where strong internal checklists and a “returned work” queue help prevent repeat returns and ASF exposure. (See the DMV manual’s ASF timeframes above.)

Internal controls that prevent missed REG 51 deadlines

Dealer Educator teaches that the most reliable compliance programs are simple, repeatable, and auditable. Here are controls that work well for REG 51 management.

1) Lock down the REG 51 book like a controlled asset

• Assign a single custodian (office manager, titling clerk, or compliance lead).
• Store unused REG 51s in a secured location.
• Restrict who can write on or issue a REG 51.

2) Maintain a REG 51 control log

Create a simple log (spreadsheet or DMS report) that ties each REG 51 number to:

• Stock number and VIN
• Buyer name
• Date sold (consummation date)
• Date dealer notice was mailed
• Status (submitted/returned/cleared/void/in-lieu)

Reconcile the log against the physical book weekly. If a number is missing, find it immediately—don’t wait for an audit to find it for you.

3) Build a “5-day notice” workflow

• Same-day handoff from sales/F&I to titling/registration.
• Daily review of consummated deals awaiting dealer notice mailing.
• Mail proof method (for example, documented mail pickup or internal outgoing mail log).

4) Standardize corrections, voids, and “in-lieu of” procedures

DMV provides specific guidance for exceptions such as:

• Corrections: Corrections are acceptable on REG 51, but the dealer or authorized representative who signed the dealer certification must OK/initial the correction. Odometer disclosure errors may require using REG 262 plus a Statement of Facts (REG 256). DMV—Corrections on REG 51
• Void REG 51: If completed in error and the sale was not consummated, mark all parts “void” and support with a Statement of Facts (REG 256). DMV—Void Report of Sale
• In-lieu-of REG 51: If a completed REG 51 is lost before submission, DMV outlines an “in-lieu of” replacement process (including referencing the original number and using REG 256 to explain). DMV—Report of Sale (Used Vehicles) chapter

Mail order sales: a REG 51 detail dealers miss

DMV allows a dealer to mail the application copy of the REG 51 to a mail-order buyer, provided the delivery of the vehicle is not made at the place of business of the mail order firm. If you do mail-order deals, make sure your paperwork checklist still protects the 5-day dealer notice deadline and confirms when delivery/possession occurs for “date sold” purposes. DMV—Mail Order Sales

Quick reference table: REG 51 deadlines and common ASF amounts

REG 51 audit prep checklist (dealer-friendly)

1. All REG 51s accounted for in numerical order (no unexplained gaps).
2. Dealer notice mail-out process documented and followed daily.
3. Deal jackets match REG 51 buyer/vehicle info and consummation date.
4. Voids supported with REG 256 and “sale not consummated” facts.
5. Corrections are OK’d/initialed by the authorized signer; odometer issues handled per DMV procedures.
6. Returned applications tracked to completion with resubmission deadlines monitored.

Bottom line

When you control REG 51 like a numbered financial document—and treat the five-calendar-day dealer notice as a non-negotiable daily workflow—you reduce ASF risk, reduce returned application churn, and make audits far less stressful. If you want a deeper walkthrough of dealership paperwork controls and registration compliance, Dealer Educator’s California dealer courses break these requirements down into step-by-step processes you can implement immediately.

Sources

• California DMV — Vehicle Industry Registration Procedures Manual: Report of Sale (Used Vehicles) General Information
• California DMV — Vehicle Industry Registration Procedures Manual: Mail Order Sales
• California DMV — Corrections on the Report of Sale–Used Vehicle (REG 51)
• California DMV — Void Report of Sale