Free California Car Bill of Sale
Selling a car privately in California is the most document-heavy private vehicle sale in the United States. You have 10 days to complete the title transfer, the seller must provide a smog certificate on most vehicles, and you need to file Release of Liability (REG 138) within 5 days of sale to protect yourself from post-sale tickets, tolls, and liability claims.
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California Car Bill of Sale — What You Need to Know
Sales Tax Details
Base state use tax is 7.25%. District taxes add 0.10%–3.00%, so effective rates range 7.25% in rural counties to 10.75% in parts of Alameda. Tax is assessed on sale price or DMV market value, whichever is higher.
Inspection Requirements
Smog certificate required for most cars older than 4 model years. Seller pays (~$40–$80). Exempt: vehicles 4 model years old or newer, EVs, pre-1976 gasoline cars, and some diesels. Certificate must be <90 days old at transfer.
California Car Sale — Step-by-Step Checklist
- Seller obtains a valid smog certificate (<90 days old) unless exempt — required for most vehicles over 4 model years old.
- Both parties complete REG 135 (Bill of Sale) with VIN, odometer, sale price, and signatures.
- Seller completes odometer disclosure on the title (federally required for vehicles under 20 years old).
- Seller signs title over to buyer and hands over any lien-release documents.
- Seller files REG 138 (Notice of Transfer and Release of Liability) online at dmv.ca.gov within 5 days — this releases the seller from civil/vehicular liability.
- Buyer completes title transfer at any CA DMV office or AAA branch within 10 days, paying 7.25%+ use tax on sale price.
- Buyer provides proof of CA liability insurance (15/30/5 minimums) at the DMV.
Common Pitfalls
- Skipping REG 138: sellers have been successfully sued for accidents and tickets racked up by buyers who delayed title transfer.
- Expired smog certificate: certificates older than 90 days at transfer are rejected — get it right before listing.
- Underreporting sale price: the DMV uses market value when the stated price looks artificially low, and misrepresentation is tax fraud.
- Missing REG 262 for damaged titles: if the title has errors or insufficient space, REG 262 (notarized, DMV-issued only) is required.
Pro Tip
For a smooth California car sale: smog certified before you list, REG 138 filed within 5 days of sale, and the buyer handed a complete document package (title + bill of sale + smog certificate + release copy). Doing all three eliminates 95% of post-sale headaches.