Private sale, trade-in or instant offer: picking a route in San Francisco

The three routes for a San Francisco seller

Each route trades your time against the price and the paperwork left to you. None of them removes your own duty to report the sale to the DMV, and the DMV's smog page puts the smog certificate on the person selling the car.

• Private sale. You set the price, write the listing, answer messages, meet people for test drives, collect payment and sign over the title. Your name stays on the DMV record until the buyer files the transfer. Safety steps are on selling privately.
• Dealer trade-in. One visit, folded into the purchase of your next car. The dealer sets the allowance, and in California that allowance brings you no sales tax saving on the purchase.
• Instant offer from the partner buyer. You describe the car online and get an offer that is free and carries no obligation. The buyer's driver inspects the car at pickup and hands you a check. The full process is on how the offer works.

One rule follows from the tax law below. If anyone outside the dealership offers more than the trade-in allowance, the difference is yours to keep, because selling the old car on its own adds no sales tax to the new one.

Source: CDTFA: Tax Guide for Motor Vehicle Dealers, industry topics; California DMV: Notice of Transfer and Release of Liability; California DMV: smog inspections; The buyer: selling and free pickup.

Why a trade-in cuts no sales tax in California

A trade-in does not shrink the taxed price of the next car in California. The CDTFA's guide for motor vehicle dealers puts it plainly: "If you accept a trade-in on the sale of a vehicle, you must still report the total selling price of the vehicle in your gross receipts. You cannot deduct the allowance for the trade-in."

The agency's own example is a $20,000 car sold with a $4,000 trade-in credit, taxed on the full $20,000. At the San Francisco rate that is 8.625% of $20,000, or $1,725, the same figure the sale would carry with no trade-in at all. The guide adds that a dealer who allows more than fair market value for a trade-in cannot treat the excess as a discount.

The San Francisco rate is 8.625% as of the CDTFA table effective October 1, 2026, which lists 8.625% for both the City and the County of San Francisco. The statewide base is 7.25%, and district taxes add the rest. Rates change, so check the table on the day you buy.

Set the allowance beside any written offer for the same car. The larger figure wins, and the tax on your next car does not move either way.

Source: CDTFA: Tax Guide for Motor Vehicle Dealers, industry topics; CDTFA: city and county sales and use tax rates (effective October 1, 2026); CDTFA: California sales and use tax rate information.

The private buyer pays use tax at the DMV

Sell to a private party and no sales tax lands on you. The buyer owes use tax instead. The CDTFA's guide for vehicle purchasers says use tax applies to cars bought from non-dealers, and on timing: "Generally, you will pay the use tax when you register your vehicle with the Department of Motor Vehicles (DMV)."

The use tax rate equals the sales tax rate and follows the address where the buyer registers the car, not where you live. A buyer registering in San Francisco pays 8.625%. One registering in Daly City or South San Francisco pays 9.875%, and one in Oakland pays 10.750%, per the same October 1, 2026 table. The CDTFA counts the whole purchase price, including any loan the buyer takes over.

One point for you as the seller. Write the true price on the bill of sale, since the buyer's tax is figured from the purchase price. The CDTFA tells a buyer who reported a lower price to the DMV than was paid to make an additional use tax payment.

Source: CDTFA: Tax Guide for Purchasers of Vehicles, vehicles; CDTFA: Tax Guide for Purchasers of Vehicles, Vessels, and Aircraft; CDTFA: city and county sales and use tax rates (effective October 1, 2026).

The dealer's document fee and its California cap

When you trade in, you are also buying, and the dealer may add a document processing charge to the purchase. The DMV's Vehicle Industry Registration Procedures Manual, section 3.030, sets the ceiling. For a dealer with a private industry partner agreement with the DMV, "the document processing charge shall not exceed eighty-five dollars ($85)". A dealer without that agreement may charge no more than $70. Both caps are as of that manual page, read in October 2026.

The same section says the dealer may not present the charge as a government fee. The CDTFA's dealer guide adds that charges for preparing sale documents are taxable, so sales tax is added to the fee as well. Ask the dealer which cap applies to it and read that line of the contract before you sign.

Source: California DMV: VIRP Manual 3.030, dealer document fee; CDTFA: Tax Guide for Motor Vehicle Dealers, industry topics.

What stays with you as the seller

Whichever route you take, California leaves two duties with you, and a private sale adds a risk to the third point. First, the smog certificate, which is due from you when the car changes hands unless the car or the transfer is exempt. Exceptions and San Francisco test stations are on the smog check page.

Second, the release of liability. The DMV requires notice within 5 calendar days from the date you sell or transfer the car and hand it over. The online and paper routes are on release of liability.

Third, the record itself. The DMV says the notice does not remove your name from the vehicle record; only the buyer's transfer application, made with the title you endorsed, does that. A private buyer who never visits the DMV leaves your name on the car. Your filed notice is what makes the buyer responsible for parking and traffic violations after the date of sale, so send it as soon as you hand the car over.

Source: California DMV: smog inspections; California DMV: Notice of Transfer and Release of Liability.

How the instant offer route plays out

Per the partner buyer's own pages, the offer is free and you are under no obligation to take it. The offer stays open for a week, long enough to accept and book the pickup. Pickup and towing cost you nothing and happen at a time that suits you. The driver compares the car with your description at pickup, does the buyer's title-transfer paperwork, and pays you by check. The buyer states that the online offer is the amount paid at pickup, which holds when the car matches what you described. From offer to payment, the buyer says, the process usually runs a few days.

This route fits a car that does not run or is missing parts, which the buyer says can still receive an offer, and a car with a salvage or missing title, which the buyer says may still be eligible in many states; see title problems and salvage titles. Your notice of transfer to the DMV is still yours to file.

Source: The buyer: selling and free pickup; The buyer: how it works.

Repair first or sell as it is: the arithmetic

A repair pays only when it lifts the sale price by more than it costs. Write it as a formula and fill in your own figures.

Gain from repairing = (B. A). R. E

Worked example, with placeholders you replace; there are no real prices here:

• A is a written offer for the car as it sits today.
• B is a written offer or quote for the same car once it is fixed.
• R is the shop's written repair estimate.
• E is everything else the repair route adds: towing to the shop, and parking or storage while the car waits.

Repair when the gain is above zero by a margin you are comfortable with. At zero or below, sell the car as it is. When you weigh a trade-in allowance against an outside offer, leave tax out of the sum, because California taxes the next car on its full price either way.

Source: CDTFA: Tax Guide for Motor Vehicle Dealers, industry topics.

Pick your route, then line up the paperwork

If you choose a private sale, read the seller paperwork before you list the car. If you want the partner buyer's instant offer, use the offer button on this page, or call (628) 333-6040 with a question about your route.