🚤 Powerboat & Motorboat Registration Guide

The Universal Rule: All Motorized Vessels Must Register

Every state in the U.S. requires registration for motorized vessels used on public waters — no exceptions. The specifics (fees, titling thresholds, where to go) vary, but the registration requirement does not. This includes boats used only occasionally, boats under 10 feet, and boats with small trolling motors.

Titling Thresholds by State

Registration and titling are separate requirements. Most states title larger vessels; smaller vessels may register but not be titled.

Hull Identification Number (HIN) Requirements

Every boat manufactured after November 1, 1972 must have a permanent 12-character HIN assigned by the manufacturer. The HIN is:

• Located on the starboard (right) side of the transom (rear), above the waterline
• 12 characters: manufacturer code (3) + serial number (5) + model year and production period (4)
• Also found on a secondary location: typically under a seat cushion, inside a hatch, or under a gunwale
• Must match the HIN on the title exactly — even a single character discrepancy requires a formal correction

Registration Number Display Requirements

All registered motorized vessels must display their registration number correctly:

• Location: Forward half of the hull (bow area), on both port and starboard sides
• Size: Characters at least 3 inches tall
• Style: Block (non-script, non-cursive) letters and numbers
• Color: Must contrast with the hull color (e.g., black on a white hull)
• Format: State prefix + numbers + letters, separated by hyphens or spaces (e.g., FL 1234 AB or FL-1234-AB)
• Decal: Current registration decal displayed within 6 inches of the registration number, on the port side in most states

What to Do When You Buy a Used Powerboat

1. Verify the HIN before purchase. Check the HIN on the transom against the HIN on the title. Run a USCG documented vessel check at uscg.mil if the boat is 26 feet or larger.
2. Check for liens. Look at the face of the title — is a lienholder listed? If so, get a lien release letter before completing the purchase.
3. Get the title properly signed. Seller must sign the assignment section on the back. Do not accept a photocopy.
4. Write a bill of sale. Include HIN, year, make, model, length, engine details, price, date, and both signatures.
5. Go to your state agency within 30 days. Transfer the title and register in your name. Operating without registration is a violation even during the transfer period in most states.

Federal Documentation vs. State Registration

Powerboats 26 feet and longer are eligible for USCG Federal Documentation — an alternative to state registration that provides additional legal protections, is required for commercial vessels, and is preferred for vessels used in international waters or as loan collateral.

Key differences:

• Federally documented vessels display their vessel name and hailing port on the stern — not state registration numbers on the bow
• Federal documentation does NOT replace state registration in most states — you may need both
• Annual renewal fee: $26 through USCG National Vessel Documentation Center
• Federally documented vessels still need to display a current state registration decal in many states

See our first boat guide for more on when federal documentation makes sense.