Boat Registration and Paperwork: What You Need to Know

Boat paperwork is the least exciting part of buying a boat — and one of the most important. A boat with missing or fraudulent documentation can be impossible to register, insure, or sell. This guide covers the documents you need, the registration process, and how it differs between Spain, the UK, and the United States.

The essential documents

Regardless of where you buy a boat, certain documents must exist and must be correct. If the seller can't produce any of these, walk away.

• Proof of ownership — a title, registration certificate, or bill of sale that proves the seller actually owns the boat. Check that the name matches the seller's ID.
• Hull Identification Number (HIN) — the boat's serial number, usually on the starboard transom. Verify it matches the paperwork. A missing or altered HIN is a major red flag.
• Registration or flag certificate — the current registration showing the boat is legally registered in a jurisdiction.
• Engine documentation — engine serial numbers, hour logs, and service records. These prove the engines match what's advertised.
• Insurance records — claims history tells you if the boat had major damage. A boat with repeated claims may have ongoing issues.
• Clearance on finance and liens — if the boat was financed, get proof the loan is settled. Outstanding liens transfer with the boat in many jurisdictions.
• Survey report — if the boat was previously surveyed, ask for the report. It contains valuable information about the boat's condition and any known issues.

Boat registration in Spain

Spain has one of the more structured boat registration systems in Europe. All boats over 2.5 meters or with engines over 10 kW must be registered.

The Spanish system

• Lista (registration list) — Spanish boats are registered in one of seven lists (Listas). Recreational boats go on Lista 6ª (Lista Sexta). Commercial boats go on Lista 4ª. The list determines what the boat can be used for.
• Registro de Matrícula — the registration certificate issued by the maritime authority (Capitanía Marítima). This is your proof of legal registration.
• Hoja de asiento — the boat's "ledger page" that records all transactions, liens, and ownership changes. Always request this to check for outstanding debts.
• ITB (Inspección Técnica de Buques) — the technical inspection, similar to a car's ITV. Required periodically depending on boat age and size. A current ITB is mandatory for registration.
• Seguro (insurance) — mandatory. At minimum, civil liability coverage is required. Most marinas require comprehensive coverage.
• Impuesto de Matriculación — the registration tax. For new boats, this is 12% of the value. For used boats being re-registered, it may apply depending on circumstances.

Buying a Spanish-registered boat

1. Verify the seller's ID matches the Hoja de Asiento.
2. Request a nota simple from the Registro de Matrícula to check for liens.
3. Ensure the ITB is current.
4. Sign a contrato de compraventa (purchase contract) before a notary.
5. Transfer the registration at the Capitanía Marítima.
6. Arrange insurance before taking possession.

Boat registration in the UK

The UK has two parallel registration systems, and the one you need depends on where you plan to use the boat.

The UK systems

• Part 1 Registration (SSR — Small Ships Register) — for UK-owned vessels. Part 1 is the more formal option, providing title evidence. The SSR (Small Ships Register) is simpler and cheaper, suitable for boats under 24 meters that don't need Part 1.
• Part 3 Registration — for vessels on the inland waterways. If you're buying a narrowboat or river cruiser, this is the system.
• CE marking — all boats sold in the UK and EU must have CE marking (Recreational Craft Directive). Check that the boat has a Builder's Plate with the CE mark and design category.

Buying a UK-registered boat

1. Check the Part 1 registry for outstanding mortgages or liens.
2. Verify the HIN matches the registration.
3. Get a Bill of Sale using the RYA template (widely accepted).
4. Transfer the registration with the Maritime and Coastguard Agency (MCA).
5. Arrange insurance — most UK marinas require minimum £3M third-party liability.

If you're buying a boat in the UK and taking it to Spain or another EU country, check the import tax implications. Post-Brexit, moving a UK-registered boat to the EU may trigger VAT and import duty.

Boat registration in the United States

The US system is state-based for smaller boats and federal for larger ones. It's more flexible than the European systems but requires attention to state-specific rules.

The US systems

• State registration — most boats under 16 feet are registered at the state level, similar to a car. You get state numbers and decals that must be displayed on the bow.
• USCG Documentation — federal registration with the United States Coast Guard. Available for vessels 5 net tons or larger (typically 25+ feet). Documentation provides a federal title and is required for certain commercial uses. Many lenders require documentation for financed boats.
• State title — many states also issue a title (similar to a car title) for boats above a certain size. Check your state's requirements.
• Hull Identification Number (HIN) — required on all boats manufactured after 1972. Verify it matches the title and registration.

Buying a US-registered boat

1. Check the state title or USCG documentation for liens.
2. Run a HIN check through the state DMV or USCG database.
3. Get a Bill of Sale and title transfer form.
4. Register the boat in your state or document it with the USCG.
5. Pay state sales tax or use tax (varies by state, 0–10%).
6. Arrange insurance — most marinas require liability coverage.

Insurance

Boat insurance is not legally required in all jurisdictions, but most marinas, mooring facilities, and lenders require it. Even if no one requires it, you should have it.

What to cover

• Third-party liability — covers damage you cause to other boats, people, or property. This is the minimum most marinas require.
• Hull and machinery — covers physical damage to your boat, engine, and equipment. Usually priced as a percentage of the boat's value (1.5–4% annually).
• Uninsured boater — protects you if an uninsured boater damages your boat.
• Salvage and wreck removal — covers the cost of salvage if your boat sinks or is abandoned. This can be extremely expensive without insurance.

Insurance costs depend on boat type, value, cruising area, and your experience. A €100,000 motor boat in the Mediterranean might cost €2,000–€4,000 per year. A €50,000 sailboat in Northern Europe might cost €800–€1,500.

Taxes and duties

Taxes vary by country and can be significant. Budget for these before you buy:

If you're buying a boat in one country and registering it in another, consult a maritime lawyer or tax advisor. Cross-border transactions can trigger unexpected tax liabilities, especially post-Brexit between the UK and EU.

Cross-border purchases

Buying a boat in a different country from where you'll keep it adds complexity:

• VAT status — if buying in the EU, confirm the boat has VAT paid status. A boat without proof of VAT paid may be liable for VAT when moved to another EU country.
• De-registration — the seller must de-register the boat in the original country before you can register it in yours. Get the de-registration certificate.
• Transport — budget for transport costs (€3,000–€15,000 for overland, more for sea delivery).
• Customs — if moving between customs territories (e.g., UK to EU), you may need customs clearance and pay import duty.

Paperwork checklist

• Proof of ownership (title or registration) — verified
• HIN matches the paperwork — verified
• No outstanding finance or liens — verified
• Service records and engine documentation — reviewed
• Insurance records and claims history — reviewed
• Previous survey report (if available) — reviewed
• Bill of Sale — signed by both parties
• Registration transfer — filed with the appropriate authority
• Insurance — arranged before taking possession
• Taxes — budgeted and paid as required

Related reading

• How to Inspect a Used Boat Before Buying — the physical inspection checklist
• How to Price Your Used Boat: Complete Guide — the 7 factors that determine value
• How to Buy a Used Boat: Complete Guide — the full buying process

This guide provides general information about boat registration and paperwork. Requirements vary by jurisdiction and change over time. Always consult the relevant maritime authority or a qualified maritime lawyer for your specific situation.