For an Idaho private sale the seller signs the title over to you (and a bill of sale with the true price), keeps the plates, and should file a Release of Liability. You take the assigned title to a county assessor's motor vehicle office within 30 days, pay Idaho sales or use tax on the purchase price (generally 6 percent, no private-sale trade-in credit), and pay the title fee ($14 state plus a county admin fee that varies by county). Miss the 30-day window and you owe a $20 late-filing penalty.
I worked through the Idaho Transportation Department vehicle-titles page, the State Tax Commission's private-and-nondealer sales guidance, Tax Commission publication EPB00060 (dated June 11, 2025), and ITD's "Top 10 Title and Registration Tips" PDF on October 16, 2026. County counters do the actual work; ITD writes the rules.
What has to land at the county counter
ITD's vehicle titles page says a private-party buyer with no lienholder must file at a county assessor's motor vehicle office within 30 days of transfer. Bring the existing title with proper signatures releasing the prior owner or lienholder. Vehicles newer than model year 2010 and under 16,000 pounds also need an odometer disclosure. If a lender is involved, that institution may prepare and file the title application for you; if it does not, you still own the 30-day clock.
A bill of sale is not optional paperwork. The Tax Commission private-sale page wants both parties to sign one that shows the total sales price, and the county will collect tax from that figure. Publication EPB00060 says a cancelled check is not enough. ITD's tip sheet adds that listing a false selling price is a felony. If you somehow lack a bill of sale, the county can tax NADA average trade-in instead, which rarely helps you.
Sales tax at the assessor, not at the curb
Buy from an individual and you owe sales or use tax when you apply for the Idaho title. The seller does not collect it at the handshake. Idaho's general rate is 6 percent of the gross sales price, and the Tax Commission is clear that trade-in allowances do not apply on private-party deals. Family exemptions and other narrow outs exist; read the Tax Commission pages before you assume you qualify. Compare the math with neighbors in our used car sales tax guide.
Title fees stack. The state piece is $14. County admin fees sit on top, so the total title charge runs from $14 in some counties up into the low thirties in others (Ada lists $21 total; Blaine lists $32.75 on the ITD county table). Rush processing is an optional extra $26. Budget the tax first; it usually dwarfs the title fee.
Plates stay with the seller, and the 72-hour window
ITD's tip sheet says keep your plates when you sell. The seller pulls them, can move them to another registered vehicle, and may get credit for unused registration time. Restricted black-and-white plates are the exception. That leaves the buyer without plates at delivery. Idaho Code treats a properly assigned title or the seller's bill of sale as a 72-hour temporary permit so you can get to the county office, not so you can commute for a month.
Sellers should file a Release of Liability (the tear-off on the title, or online) within five days of delivery. The filing fee is $3.50. Without it, the seller stays the owner of record if you never title the car, which is how parking tickets and worse end up on the wrong doorstep.
Out-of-state titles and the VIN inspection
Any vehicle coming in on an out-of-state title, or never titled in Idaho before, needs a VIN inspection. Authorized inspectors include peace officers, DMV employees, military police and Idaho licensed dealers. The inspection exists so the new Idaho title matches the metal on the car. Our VIN verification guide covers what gets compared. Salvage or rebuilt brands change the path; start with our Idaho salvage and rebuilt title rules.
History check before money changes hands
Idaho will title what the paperwork supports. It will not warn you about a flood brand that washed through another state. Pull NMVTIS and a full history report yourself. Our CARFAX for private-party deals post shows which lines to read twice. CarVins is a licensed CARFAX and AutoCheck reseller and is not part of CARFAX, AutoCheck or Experian. Mid October 2026 pricing on our side is typically about $5.50 a report for guests, $4.50 for members, or roughly $6.75 when you grab both, against retail figures near $39.99 to $44.99; the number on the checkout screen is the one that counts. See CARFAX's report overview.
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