Free Idaho Trailer Bill of Sale
Idaho's trailer paperwork starts at 2,000 pounds unladen: utility trailers under that weight are exempt from titling entirely, while everything heavier — which includes most livestock, equipment, and enclosed trailers — titles and registers at the county assessor's motor vehicle counter within 30 days. The tax stays simple either way: a flat 6% with no local additions anywhere in Idaho. For a sub-2,000-pound trailer, the bill of sale becomes the whole ownership story, and commercial operators can put qualifying trailers on Idaho's permanent plate to skip renewals.
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Idaho Trailer Bill of Sale — What You Need to Know
Sales Tax Details
Same flat 6% sales tax on trailers.
Idaho Trailer Sale — Step-by-Step Checklist
- Weigh the question: under 2,000 lbs unladen = no title exists, transfer on registration/bill of sale; over = title and registration at the county assessor.
- Verify the VIN or serial plate on the tongue against the title (heavier trailers).
- Complete form ITD 3738 (Idaho's bill of sale) with VIN/serial, type, unladen weight, sale price, date, and both signatures.
- Seller signs the title over on 2,000-plus-pound trailers.
- Buyer files at the county assessor's motor vehicle office — not a central ITD building — within 30 days.
- Buyer pays the flat 6% Idaho sales tax plus fees.
- Commercial trailer fleet? Ask about Idaho's permanent plate option to end annual renewals.
Common Pitfalls
- Expecting a title on a light utility trailer — under 2,000 pounds unladen Idaho never issued one; the bill of sale is the record.
- Underestimating a livestock or equipment trailer — most full-size units clear 2,000 pounds empty and need the full title process.
- Driving to an ITD office — the county assessor's counter handles trailer titles and registration.
- Missing the 30-day window on a titled trailer.
Pro Tip
Idaho trailers: the 2,000-pound unladen line splits bill-of-sale-only from full title-and-registration — either way it's the county assessor's counter and a flat 6%.