The short version
Driving a private-sale car home is legal exactly when three things are true at once: the car is insured in your name, it carries a tag or permit the state issued for it, and the glovebox holds the paper that proves you bought it today. Settle all three before you pay, not after — the tag office's hours do not care that the seller wants the car gone by five. When one of the three cannot be made true today, the flatbed is the right answer, and a far smaller bill than the one a traffic stop writes.
The deal is done. The title is signed, the money has moved, the keys are in your hand — and the car is parked on the seller's street wearing the seller's plates, or none at all, and you have not worked out how it gets to your driveway. Dealers hide this problem: they print a temporary tag, bind the insurance, and hand you the car. In a private sale the buyer is the dealer, and the drive home is the first thing you own.
The rules for plates, temporary tags, and transit permits are set state by state and they change, so this guide quotes no fees, validity periods, or form numbers — your state DMV's website has those. What follows is the shape of the problem anywhere in the US: what stays with the seller, where a buyer's tag comes from, what has to be true before the key turns, and when a tow is the cheaper answer.
Whose plates stay with the car
In most states the license plates belong to the seller, not the vehicle. They come off at the sale, and the seller moves them to their next car or turns them in. In a minority of states the plates stay with the car. Which rule applies is a question for the state the car is titled in — not the state it happens to be parked in, and not the seller's opinion.
Driving off on the seller's plates in a plates-follow-the-seller state means driving an unregistered car wearing someone else's registration. Every toll and camera ticket on the way home lands on the seller, and if you are stopped, the plate returns a name that is not yours on a car the title says you bought today. A seller who offers to "lend" the plates is being generous with something they cannot lend. A seller who keeps them has done it right — and now the tag is your job.
- Ask early which state the car is titled in, and read that state's rule on whether plates stay with the seller or the car
- If the plates come off, watch them come off — a plate left on by accident is still the seller's registration
- If the plates stay with the car, get that in writing on the bill of sale
- Never accept a plate from another car, a friend of the seller, or a "dealer connection" — that is not a temporary tag, it is a crime with your name on it
Temporary tags and transit permits: where they come from
A temporary tag is short-term registration issued to a buyer so a just-bought car can be driven legally before its permanent plates exist. Many states issue one to a private buyer directly — at a DMV or county tag office counter, online with a printout, or through a licensed agent. Others call it a transit or trip permit and limit it to a drive from the point of sale to your home, an inspection station, or the DMV itself. And some states issue nothing to a private buyer, which means the car is towed, trailered, or registered before it moves.
What the office wants is the same almost everywhere: the signed title or a bill of sale showing the sale date, proof of insurance on the car, your license, and a fee. The catch is timing. An online tag can be printed before you hand over a dollar; a counter-only tag office is closed on the Saturday afternoon you planned to buy. The tag question belongs in the planning, not the parking lot.
One thing a temporary tag is not: a piece of paper you buy from a stranger. Paper tags printed through dealer systems have been forged and resold, and a private seller whose "buddy at a dealership" can print you one is describing a fraudulent tag — and often themselves, since a seller with dealer plumbing and no dealer license is usually a curbstoner. A tag comes from the state or a state-authorized agent, tied to your name and this VIN, or it is not a tag.
- Find out whether your state — or the seller's — issues a buyer's temporary tag, and whether it is a counter, online, or agent transaction
- Learn what it permits: unrestricted driving until the plates arrive, or a single trip to a named destination
- Have the documents it requires ready before the sale: title or bill of sale, insurance card, license
- Confirm the VIN printed on the tag matches the dash and the door jamb before it goes in the window
- Buying across a state line, settle which state's tag you can actually obtain — the out-of-state buyer's guide covers the rest of that trip
Insurance before the key turns
Insurance comes before the tag, because the tag office asks for it, and before the drive, because every state expects a car on a public road to be covered. Many auto policies extend some coverage to a newly acquired vehicle for a short window, but the window, what it covers, and whether it applies to you vary by policy. "Many policies" is not "yours." Treat the grace period as a backstop, not a plan.
The clean move is to call your insurer the morning of the sale with the VIN from the ad and have the car added before you leave the house; most do it by phone or in the app in minutes and send a digital ID card. If this is your first car and you carry no policy, bind one first — nothing else here works without it. Keep the proof on your phone and printed in the glovebox, because a phone that dies on the shoulder is not proof of anything.
The glovebox packet and what a traffic stop wants to see
Assume you will be stopped: a car with no plates, or a fresh paper tag, is what patrol officers look at twice. The stop goes quickly if you can show who you are, that the car is insured, and that you bought it today. The bill of sale answers the last question — it carries the sale date and the VIN — which is why the title transfer checklist tells you to write two signed copies. One goes in your glovebox before the engine starts.
The signed title travels home with you too, but not loose on the seat: it is the one document that proves ownership. Photograph every page before you drive, and take it into the house — not the car — when you arrive.
- Your driver's license
- Proof of insurance for this car, digital and printed
- The bill of sale, signed by both parties, dated today, with the VIN, price, and mileage
- The signed title, or a copy if the tag office kept the original
- The temporary tag or transit permit, displayed where your state says — rear window, plate bracket, or dash
- Phone photos of all of the above, taken before you left the seller's driveway
Tow or drive: the decision
The drive home puts the first miles on a car you have owned for an hour, with nothing behind the wheel but a test drive. That is fine when everything above is in place and the car checked out. If the pre-purchase inspection flagged brakes, cooling, a tire near its cords, or anything that made the shop hesitate, the drive home is where that becomes a roadside problem — on a car with no plates and a paper tag, which turns an ordinary breakdown into a question about the registration.
A flatbed tow or a rented trailer is not a defeat. Set against a ticket for driving unregistered, an impound, or a breakdown a hundred miles from home, it is usually the cheaper afternoon. Take the tow when any of these is true:
- Your state issues no temporary tag to a private buyer, and the car cannot be registered before it moves
- The tag office is closed and the car has to leave the seller's property today
- Insurance is not bound — the policy starts Monday, or the app says "pending"
- The car has sat for months: old fuel, a suspect battery, cracked or flat-spotted tires, no recent drive of any length
- The inspection or test drive turned up anything safety-critical — brakes, steering, cooling, a warning light the seller "was going to look at"
- Your state requires a safety or emissions inspection before registration and the car is likely to fail — tow it to the shop, not to the test