A marine mortgage works like a home mortgage in structure but runs on federal maritime law: you borrow money to buy a boat, the lender takes a lien on the vessel as collateral, and the loan is recorded with the U.S. Coast Guard rather than a county recorder. When properly filed, the lien becomes a “preferred mortgage” that follows the boat through any change of ownership and gives the lender strong rights to seize and sell it in federal court if you stop paying.1Office of the Law Revision Counsel. 46 USC 31322 – Preferred Mortgages The rest of how it works — eligibility, paperwork, priority, and enforcement — diverges sharply from residential lending.
What Makes a Marine Mortgage “Preferred”
The word “preferred” is doing real work. A marine mortgage becomes a preferred mortgage only when it is recorded with the National Vessel Documentation Center (NVDC), covers the entire vessel including engines, masts, and permanently attached equipment, and meets the statutory requirements in 46 USC 31322.1Office of the Law Revision Counsel. 46 USC 31322 – Preferred Mortgages Preferred status is what gives the lender priority over most competing claims and the ability to enforce the lien against the boat itself, not just against you personally. A mortgage on a partial interest, or one that never gets properly recorded, doesn’t qualify.
Which Boats Qualify
Not every boat can carry a marine mortgage. The vessel must measure at least five net tons — roughly 25 feet or longer — and must be federally documented through the Coast Guard rather than titled with a state.2Office of the Law Revision Counsel. 46 USC 12103 – General Eligibility Requirements Documentation places the boat on a national registry and assigns it a unique official number that stays with the hull for life, regardless of name changes or resales. Lenders use that number to trace ownership and check for existing liens.
Ownership has to meet citizenship rules as well. Individual owners must be U.S. citizens, and corporations, partnerships, and trusts each have their own citizenship requirements to keep the vessel eligible for documentation.2Office of the Law Revision Counsel. 46 USC 12103 – General Eligibility Requirements If a vessel loses its documentation eligibility, the preferred status of the mortgage can be jeopardized.
One boundary worth noting: small recreational boats registered only with a state cannot serve as collateral for a preferred marine mortgage. You may still be able to borrow against them, but the loan won’t have the federal protections described here.
Typical Terms and Upfront Costs
Marine mortgages usually carry higher interest rates and shorter terms than home loans. Lenders typically ask for 10 to 20 percent down, with terms running 10 to 20 years depending on the vessel’s age and value. Borrowers with excellent credit may see rates starting around 6 to 7 percent; weaker credit pushes rates higher. Rates and terms move with the market, so shopping several lenders matters more here than in residential lending, where rates tend to cluster.
Expect several upfront costs beyond the down payment:
- A professional marine survey of the hull, engines, electrical systems, and safety equipment, usually required before funding. Costs range from several hundred to a few thousand dollars depending on vessel size.
- An Abstract of Title from the NVDC, showing ownership history and recorded liens. The fee is $25.3National Vessel Documentation Center. Fee Schedule 09-2025
- A recording fee of $4 per page to file the mortgage with the NVDC.3National Vessel Documentation Center. Fee Schedule 09-2025
- A documentation application fee if the vessel isn’t already federally documented.
What Goes Into the Mortgage Document
A marine mortgage instrument has to include information you wouldn’t see on a home loan: the vessel’s name, Coast Guard official number, and hull identification number, plus the full legal names and addresses of borrower and lender. The document must state that it covers the whole vessel, and it must declare the maximum dollar amount it secures.1Office of the Law Revision Counsel. 46 USC 31322 – Preferred Mortgages That maximum figure ends up in the public record so anyone considering a claim against the boat can see how much is secured.
Every instrument filed with the NVDC must be acknowledged, which in practice means notarized. Federal rules accept any acknowledgment that substantially complies with the Uniform Acknowledgments Act, the Uniform Recognition of Acknowledgments Act, or the notarial laws of the state where the signing occurs; a Hague Apostille works for international transactions.4eCFR. 46 CFR 67.3 – Definitions Botched notarization is a common reason filings bounce back.
Attaching Form CG-5542, the Optional Application for Filing, functions as a cover sheet with the key indexing details. When it’s complete, the NVDC records the mortgage without further review of the underlying instrument.5eCFR. 46 CFR Part 67 – Documentation of Vessels Skipping it means a filing officer has to pull the details out of the full document, which slows processing and raises the chance of rejection.
Recording With the NVDC
Once the paperwork is ready, the mortgage, Form CG-5542, and the recording fee go to the NVDC by mail, courier, or electronic submission. Filings are processed in the order received, and backlogs can be significant. As of January 2026, the NVDC was working on filings from early December 2025, roughly a seven-week lag.6GovDelivery. National Vessel Documentation Center as of January 23, 2026
After acceptance, the NVDC indexes the mortgage against the vessel’s record and issues a Certificate of Ownership (Form CG-1330) listing active encumbrances. Until indexing is complete, the mortgage exists but does not yet have preferred status, so the processing gap is a real exposure period for the lender. That’s part of why closing timelines on boat purchases often build in a cushion.
Ongoing Obligations While the Loan Is Outstanding
Marine mortgage agreements almost always require hull insurance at least equal to the loan balance, with the lender named as loss payee. Insurance proceeds go to the lender first if the boat is damaged or destroyed. Letting coverage lapse is typically an event of default even if payments are current, and cancellation notice periods are short: often 30 days for voluntary cancellation and 10 days for nonpayment of premium.
Maintenance covenants are more aggressive than what you’d see on a house because saltwater eats collateral. Many commercial marine loans include a loan-to-value covenant requiring the vessel’s market value to stay above a specified percentage of the loan balance, commonly between 110 and 150 percent. If the appraised value slips below that threshold, the lender can demand a partial prepayment or additional collateral even if no payment has been missed. The cure period is often around 30 days.
The lender also holds a practical veto over administrative changes. Certain changes to the vessel’s documentation — including ownership, name, or hailing port — require the mortgagee’s written consent before the NVDC will process them. Cruising to foreign ports on a recreational vessel usually doesn’t trigger these restrictions, but the mortgage may contain its own contractual navigation limits, so read the agreement.
Where a Marine Mortgage Sits in Line
A preferred mortgage ranks high in a foreclosure sale but not at the top. When a court orders a vessel sold to satisfy claims, the proceeds are distributed in a fixed order: court expenses and fees, court costs, and preferred maritime liens all come ahead of the mortgage.7Office of the Law Revision Counsel. 46 USC 31326 – Court Sales to Enforce Preferred Mortgage Liens and Maritime Liens and Priority of Claims
“Preferred maritime lien” is defined by statute to include six categories: any maritime lien that arose before the mortgage was filed, damage from a collision or other maritime tort, wages of stevedores employed by certain vessel operators, crew wages, general average contributions, and salvage claims, including contract salvage.8Office of the Law Revision Counsel. 46 USC 31301 – Definitions All six outrank the mortgage. That hierarchy is the trade-off in maritime lending: a lender’s security interest is strong, but it yields to the traditional protections for the people who crew, rescue, and are injured by vessels.
What Happens If You Default
Federal statute gives the lender three enforcement paths, and more than one can be pursued at once.9Office of the Law Revision Counsel. 46 USC 31325 – Preferred Mortgage Liens and Enforcement
- An action in rem is a civil suit against the vessel itself in federal court. A U.S. marshal can seize the boat even if someone else claims a possessory lien, and the court orders it sold at auction. The sale extinguishes all claims, with proceeds distributed by priority.
- An action in personam is a suit against you, and any co-makers or guarantors, for the full outstanding balance. This matters most when the boat is worth less than the loan.
- The statute also permits any extrajudicial remedy allowed under applicable law, provided it doesn’t violate federal restrictions on vessel transfers.
The deficiency risk is what most borrowers overlook. Federal maritime enforcement explicitly allows the lender to pursue any shortfall from your other assets if the auction proceeds don’t cover the debt.9Office of the Law Revision Counsel. 46 USC 31325 – Preferred Mortgage Liens and Enforcement Boats depreciate faster than houses, so being underwater on the loan, especially in the early years, isn’t unusual.
Interest Deduction if the Boat Qualifies as a Home
If the boat has sleeping quarters, a cooking area, and a toilet, the IRS treats it as a home for purposes of the mortgage interest deduction, either as your primary or second home.10IRS. Publication 530 (2025) – Tax Information for Homeowners The same limits that apply to conventional home mortgages apply here: for loans taken out after December 15, 2017, interest is deductible on up to $750,000 in total mortgage debt ($375,000 if married filing separately). All three facilities have to actually exist; a fishing boat with an ice chest doesn’t qualify. Confirm with a tax advisor before closing if this is part of your reason for buying.
Discharging the Mortgage
Paying off the loan doesn’t clear the record automatically. The lender has to execute a satisfaction instrument, properly signed, dated, and notarized like the original, and file it with the NVDC.11eCFR. 46 CFR Part 67, Subpart O – Filing and Recording of Instruments, General Provisions The filing fee is $4 per page, the same rate as the original recording.3National Vessel Documentation Center. Fee Schedule 09-2025 Until the NVDC processes the satisfaction, the lien remains visible on any Abstract of Title, which can hold up a resale or a refinance. If your lender is slow to file, push. An unreleased mortgage is one of the most common and avoidable snags in vessel transactions.