Idaho Vehicle Bill of Sale — What It Needs & Check First
Everything you need to complete a bill of sale in Idaho: what information goes on it, which transfer documents change hands, and how it all flows to the Idaho Transportation Department. Before you sign, run the 17-character VIN — it confirms the title is clean and the odometer reading checks out. It's free.
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Idaho Vehicle Sale Data at a Glance
- Idaho registered vehicles
- 1.8M
- Idaho population
- 2.0M
- Idaho titling authority
- ID
- VIN check before signing
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Idaho Bill of Sale Rules
The specifics for Idaho, taken from the Idaho Transportation Department and Idaho law. Every source is linked at the bottom of this page.
ITD 3738
Idaho publishes its own vehicle bill of sale, Bill of Sale (ITD 3738). Using the state's form is the safest option — it already contains every field the Idaho Transportation Department looks for.
Sometimes
A bill of sale is not on ITD's required-document list for an ordinary private-party sale - the existing title signed over by the previous owner is what the county DMV needs - but ITD says a Bill of Sale may be used 'in the event that a properly released title cannot be obtained', in which case it must be paired with the Conditional Title Statement of Facts (ITD 3405).
Not required
The state's own Bill of Sale form ITD 3738 (Rev. 10/23) contains no notary block or acknowledgment - only seller and buyer signature lines - and neither the ITD Vehicle Titles page nor the Conditional Title instructions ask for the bill of sale to be notarized (the separate Duplicate Idaho Title Application ITD 3369 does have to be notarized, but that is a title document, not the bill of sale).
30 days
The buyer must file the title application with a county assessor's motor vehicle office within 30 days of transfer or pay a $20 late-filing penalty; ITD 3738 states this obligation applies 'whether the vehicle is registered or not'. Do not confuse it with the SELLER's separate duty to file a release of liability statement within 5 days of delivering the vehicle.
Bill of Sale (ITD 3738)
This is the form Idaho issues for a vehicle bill of sale. It already contains every field the Idaho Transportation Department looks for, which is why it is worth using instead of a generic template.
Get ITD 3738 from itd.idaho.govWhere Idaho Sits Among the 50 States
Every figure below is counted from the same state-by-state research that produced the Idaho answers above. It is here because "not required" reads very differently once you know how many other states say the same thing.
The official form
Idaho is one of 25 states that publish a vehicle bill-of-sale form of their own. Another 15 publish none at all and leave the wording entirely to the parties. Having a state form matters more than it sounds: it is the document the counter clerk has seen ten thousand times, so nothing on it has to be argued about.
Whether the document is required
8 states demand a bill of sale always, 11 never, and 23 — Idaho included — somewhere in between. The in-between group is where most of the confusion in this subject lives, because both of the confident answers you will hear are correct about somewhere else.
Notarization
Notarization is required in 2 states and conditionally required in 10. Idaho is in neither group, so the buyer and seller signing is the complete requirement. Sign the same document at the same time, and keep a copy each — an unsigned counterpart is the far commoner problem.
The buyer's deadline to apply for title
30 days is the commonest deadline in the country: of the 34 states with a calendar-day deadline, 10 give buyers less time, 6 give more, and 17 run exactly the same clock as Idaho. The range across the country is 10 to 60 days.
What Goes on an Idaho Bill of Sale
Idaho issues ITD 3738, so start there — but whichever form you use, a complete bill of sale always captures these four things:
Buyer & seller details
Full legal names and addresses of both parties, so the Idaho Transportation Department can tie the sale to real people.
Odometer reading
The exact mileage at the moment of sale — a legal disclosure that protects against rollback fraud.
Vehicle description & VIN
Year, make, model, body style, and the full 17-character VIN that ties everything to the car.
Price, date & signatures
The agreed price, the date of sale, and both signatures — notarized if Idaho requires it.
How a Private Sale Transfer Works in Idaho
Titling in Idaho is handled by the Idaho Transportation Department. Fees depend on the vehicle, but the paperwork flow in a private sale is always the same — here is how the bill of sale and the title move together.
- 1Complete the bill of saleFill in the buyer and seller details, sale price, date, odometer reading, and the full VIN. Use Idaho's own form, ITD 3738 — it already has every field the Idaho Transportation Department checks. Both parties sign.
- 2Sign over the titleThe seller signs the existing Idaho title over to the buyer in the assignment section, recording the same sale price, date, and odometer reading shown on the bill of sale.
- 3File with the DMVThe buyer brings the bill of sale, signed title, odometer disclosure, and proof of identity to the Idaho Transportation Department to transfer the title, pay any tax due, and register the vehicle. In Idaho the buyer has 30 days from the date of sale to do this.
Idaho Vehicle Transfer Documents
The bill of sale is one of several papers that change hands when a car is sold in Idaho. These are the documents a private transfer usually involves:
Bill of sale
Proof of purchase the Idaho Transportation Department uses to calculate sales tax: who, what, when, how much, and the VIN.
Signed-over title
The primary ownership document. The seller assigns the Idaho title to the buyer in its assignment section.
Odometer disclosure
A required mileage statement, often built into the title or bill of sale, guarding against rollback fraud.
Lien release
If the car had a loan, the lender's release proving the lien is paid so a clean title can transfer.
Idaho titling authority
Vehicle titles and transfers in Idaho are handled by the Idaho Transportation Department. About 1.8M vehicles are registered across the state, and every transfer is recorded against the VIN — so the documents you sign should always match the VIN on the car. See the Idaho vehicle title guide for the title side of the transfer.
Why Check the VIN Before You Sign in Idaho
The bill of sale records what the seller claims. A free VIN check shows what actually happened to the car — before you put it in writing.
Confirm the odometer reading. The mileage you write on the Idaho bill of sale is a legal disclosure. An odometer rollback means the figure the seller gave you is wrong — and the car is worth less.
Make sure the title is clean. A bill of sale can't undo a salvage brand. Check that the title has no hidden brand before you agree on a price.
Rule out an open lien. If a previous owner's loan was never paid off, the title can't pass to you cleanly. A Idaho lien check surfaces it before money changes hands.
Check before you sign
Enter the 17-character VIN to confirm the title is clean, lien-free, and the mileage checks out — everything you want verified before the Idaho bill of sale is signed.
Mistakes Worth Avoiding on an Idaho Bill of Sale
Almost none of these are legal problems. They are clerical ones — and they cost the same afternoon at the Idaho Transportation Department either way, usually after the seller has already gone home and stopped answering the phone.
- 1
The odometer box is empty
The mileage is a legal disclosure, not a courtesy, and "as is" or a dash in that box is the commonest reason a bill of sale gets handed back. Write the exact number showing on the dashboard, not a rounded one, and write the same number on the title assignment. If the two documents disagree the transfer stalls, and the version the Idaho Transportation Department believes is the one that makes the buyer's car worth less.
- 2
Something has been crossed out
Alterations are read as tampering, especially on the title. A struck-through VIN, a corrected mileage figure or a whited-out name is usually enough for a clerk to reject the document outright, and on an Idaho title it can mean applying for a duplicate before the transfer can go ahead at all. Start a fresh sheet instead. A bill of sale costs nothing to reprint and a duplicate title costs a fee and a wait.
- 3
The VIN was copied from the advert
A VIN is 17 characters and there is no way to tell a correct one from a wrong one by looking at it — which is exactly why transcription errors survive all the way to the Idaho Transportation Department. Read it off the car, not off the listing: the plate at the base of the windscreen on the driver's side, and again on the sticker in the driver's door jamb. If those two disagree with each other, stop. That is not a typing mistake, and no bill of sale can fix it.
- 4
The price is a placeholder
Writing "$1" or "gift" on a sale that was neither is a bad idea in every state. The price on the bill of sale is what a tax assessment is calculated from, so an understated figure is not a clever saving — it is a document that contradicts the money that actually moved, signed by both of you. If the car genuinely was a gift, record it as one; that is a different transaction with its own paperwork, and the Idaho Transportation Department handles it as such.
- 5
Only one copy exists
Both parties need one, and the seller needs theirs more. The buyer has the car; the seller has nothing but a document proving when they stopped being responsible for it — which is what answers a parking ticket, a toll bill, or a police enquiry six months later. Make two copies, sign both, and keep yours somewhere you will still be able to find it. Photographing it on the spot takes five seconds and has saved a great many arguments.
- 6
The two signatures were made at different times
A bill of sale is a record of a moment, and both parties are meant to be at it. Idaho does not require a notary, but the same logic applies — a document one party signed and posted is far weaker evidence than one both parties signed together. Sign the same piece of paper, at the same time, and make the second copy before you part.
After the Idaho Bill of Sale: What Happens Next
Signing is the middle of the process, not the end of it. Each step below is a separate Idaho record with its own rules, and a problem in any of them surfaces after the money has moved unless you look first.
The title is the transfer; the bill of sale only records it. This is the single most expensive misunderstanding in a private sale — a signed receipt and a set of keys do not make you the owner in Idaho, and a buyer who never completes the assignment finds out when they try to sell the car on. What the seller has to sign, where the odometer statement goes, and what to do when the title is lost are all covered in the Idaho vehicle title guide.
Nothing moves while a lien is open. If the seller still owes money on the car, the lender holds the security interest and the Idaho Transportation Departmentwill not print a clean title in your name until it is released. That release usually comes by post from the lender, which is why the buyer's deadline is rarely the real constraint. Establish whether a lender is on the record with an Idaho lien check before you hand over cash, not after.
The mileage you write down is a legal statement. The odometer figure on the bill of sale and the one on the title have to agree, and both have to be true — a reading that is lower than a previously reported one is the signature of a rollback, and it is the buyer who carries the loss. Compare every reading ever filed against the VIN in the Idaho odometer check.
A brand travels with the car, not with the seller. If the vehicle was written off at any point in its life, the brand is attached to the VIN and it follows the car into Idaho whichever state applied it. No bill of sale can remove it, and no verbal assurance survives contact with the title. The Idaho salvage title check shows what is recorded against it.
Then the plates. Titling and registering are two different transactions, and the second one is what puts the car legally on the road — with its own proofs, its own fees and, in some counties, its own inspection. The requirements are set out in the Idaho vehicle registration guide.
Or do all of it at once. Title brands, reported mileage, theft records and open liens are all keyed to the same 17 characters, so there is no reason to check them one at a time. The Idaho VIN check runs them together, before the bill of sale is signed rather than after.
Check an Idaho Car Before You Sign
Confirm the title is clean, lien-free, and the mileage matches before money changes hands. Free, in seconds.
Bill of Sale in Other States
Titling and transfer rules are run state by state, with different agencies and forms. Compare Idaho with these guides, or run any VIN nationwide.
Vérifiez toujours le VIN avant d’acheter
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Idaho Bill of Sale FAQ
The questions Idaho buyers and sellers ask most about the bill of sale and the documents a private car sale needs.
What goes on a bill of sale in Idaho?+
An Idaho bill of sale records the full names and addresses of the buyer and seller, the sale date, the purchase price, the vehicle's year, make, model, and body style, the exact odometer reading, and the 17-character VIN. Both parties sign it. Idaho publishes an official form, Bill of Sale (ITD 3738); using it is the safest option because it already has every field the Idaho Transportation Department checks. Confirm the VIN on the bill of sale matches the title and the dashboard before signing — and run a free VIN check first to verify the title is clean and lien-free.
Do I need a bill of sale to transfer a car in Idaho?+
In some transfers, yes. A bill of sale is not on ITD's required-document list for an ordinary private-party sale - the existing title signed over by the previous owner is what the county DMV needs - but ITD says a Bill of Sale may be used 'in the event that a properly released title cannot be obtained', in which case it must be paired with the Conditional Title Statement of Facts (ITD 3405). The signed-over title remains the primary ownership document; the bill of sale is the dated proof of purchase the Idaho Transportation Department uses to confirm the sale and calculate any tax due.
Does an Idaho bill of sale need to be notarized?+
No. The state's own Bill of Sale form ITD 3738 (Rev. 10/23) contains no notary block or acknowledgment - only seller and buyer signature lines - and neither the ITD Vehicle Titles page nor the Conditional Title instructions ask for the bill of sale to be notarized (the separate Duplicate Idaho Title Application ITD 3369 does have to be notarized, but that is a title document, not the bill of sale).
How long do I have to transfer a title in Idaho?+
30 days from the date of sale. The buyer must file the title application with a county assessor's motor vehicle office within 30 days of transfer or pay a $20 late-filing penalty; ITD 3738 states this obligation applies 'whether the vehicle is registered or not'. Do not confuse it with the SELLER's separate duty to file a release of liability statement within 5 days of delivering the vehicle. This is the buyer's deadline to apply for title — a seller's duty to report the sale, where one exists, runs on a separate clock.
Is Idaho unusual about bills of sale?+
Idaho publishes its own form, which 25 states do and 15 do not. On whether the document is required at all, the country splits 8 always, 23 sometimes and 11 never, out of the 42 states publishing a rule. Notarization is the real outlier: 23 states say it is not needed, 10 require it in certain transfers, and 2 require it every time (Louisiana and West Virginia).
Does a car bill of sale have to be notarized?+
Not in most of the country. Of the 35 states where the rule is published, 23 do not require notarization, 10 require it for particular transfers, and 2 require it on every one — Louisiana and West Virginia. Idaho is in the majority: signatures from buyer and seller are enough. The advice that "a bill of sale must always be notarized" is a rule from somewhere else, repeated without its state attached.
Is 30 days a long time to transfer a title?+
It is the commonest deadline in the country. Across the 34 states that publish a calendar-day deadline for the buyer, the figure runs from 10 days to 60, and 30 days is the commonest single answer — 18 states use it. 10 states give buyers less time than Idaho does and 6 give more. The clock starts on the date written on the bill of sale, so do not backdate it to cover a delay: that shortens your own deadline. Where the car had a loan, the real constraint is usually how long the lender takes to send a lien release, not the Idaho Transportation Department's deadline.
Can I use an out-of-state bill of sale in Idaho?+
Usually yes for the document itself — a bill of sale is a record of a transaction, and Idaho does not reject one because it was typed on another state's template. What does not travel is the procedure around it: 2 states require notarization and the rest largely do not, deadlines to apply for title range from 10 to 60 days, and 25 states publish a form with fields the other 25 never ask for. If you are buying across a state line, the rules that bind you are the ones where the car will be titled, not the ones where it was sold. Run the VIN before you cross the line either way — a brand applied in one state follows the car into the next.
What documents do I need to buy a used car in Idaho?+
Besides the bill of sale, you'll typically need the Idaho title signed over by the seller, an odometer disclosure (often part of the title or bill of sale), a lien release if the car had a loan, and your own proof of identity and insurance to register it with the Idaho Transportation Department. A free VIN history check isn't legally required, but it's the smartest document to add — it confirms the title is clean before money changes hands.
Why check the VIN before signing a bill of sale in Idaho?+
The bill of sale records what the seller claims; a VIN check shows what actually happened to the car. Running the 17-character VIN before you sign confirms the title is clean, the odometer reading is consistent with the car's history, and there's no open lien that would block the transfer at the Idaho Transportation Department. It's free and takes seconds.
Are there any specific titling rules in Idaho?+
Idaho requires VIN inspection by an authorized agency for any out-of-state vehicle being titled.
Sources for the Idaho Rules on This Page
The Idaho-specific rules above come from the following official government pages. Last checked 2026-08-22. Rules change — if you are relying on one for a sale, confirm it at the source before you sign.
Buying or Selling a Car in Idaho? Check the VIN First.
Enter a 17-character VIN to confirm a clean, lien-free title and an honest odometer reading before you complete the Idaho bill of sale.
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