Why "Bust Out Another Thousand"
The purchase price is only the entry fee. A boat sits in water or weather, it has an engine that needs service, and it needs a place to live when you are not using it. Each creates a bill that comes back every year, whether you go out fifty times or twice.
The good news: the bills are predictable. The six categories below cover almost every owner.
The Six Yearly Cost Categories
Insurance
Liability cover protects you if you damage another boat, a dock or a person. Hull cover pays for damage to your own boat. Ask whether a policy pays an agreed value or the actual cash value, because the second one subtracts depreciation after a total loss.
Slip or storage
A wet slip at a marina is usually priced per foot of boat length, per season or per year, so the fee depends on size and location, not on what the boat cost. Dry stack storage, a storage yard, or a trailer in your own driveway all cost less, but each adds launch time or launch fees.
Maintenance and repairs
Engine service, impellers, zincs, bottom paint for boats kept in the water, canvas and batteries. Older boats need more of it.
Fuel
Fuel depends on engine type, hull, speed and hours run. Planing powerboats burn far more per hour than sailboats or displacement hulls.
Registration and documentation
Each state sets its own registration fee, often by boat length. Vessels of at least five net tons that are wholly owned by U.S. citizens can instead be federally documented with the U.S. Coast Guard. The National Vessel Documentation Center charges $133 for an initial Certificate of Documentation, and a recreational renewal costs $26 per year for a term of one to five years (fee table in 46 CFR 67.550). Some states still charge documented boats a fee.
Winterizing and spring commissioning
In cold climates, the engine, water system and plumbing must be protected from freezing, and the boat is often hauled out and shrink-wrapped. In spring, the work reverses.
The 10% Rule of Thumb
A figure you will hear from boat owners, brokers and boating writers is to budget about 10% of the purchase price every year for ownership costs. Treat it as a rule of thumb, not a statistic. No government agency or industry body measures it, and people disagree on whether it covers only maintenance or every cost including the slip.
The rule is a fair first guess for boats in the tens of thousands of dollars. It breaks down at the edges. A $10,000 used boat in a busy marina can easily cost more than its whole value in slip fees over a few years, because the slip is priced by length. A new boat under warranty often costs less than 10% in its first years. The chart shows what the rule predicts; the calculator shows what your quotes add up to.
Annual Boat Ownership Cost Calculator
Enter the boat's price or current value and your yearly cost for each item. Use real quotes where you have them. The starting numbers are a made-up example, not averages. Everything is calculated in your browser.
Method: yearly total = the sum of the seven cost items. Monthly = yearly total / 12. Per outing = yearly total / outings. Percentage = yearly total / boat value x 100, compared with the 10% rule of thumb. Fixed costs such as the slip do not shrink in a year with few outings. Educational tool, not financial advice.
Ways to Lower the Bill
Match the storage to the use
If the boat fits on a trailer and you have space, home storage removes the largest fixed cost for many owners. Weigh it against launch fees.
Get several insurance quotes
Compare the same cover: the same hull value, agreed or actual cash value, deductible and cruising area.
Do the routine work yourself
Oil changes, filters, zincs and cleaning are within reach of most owners with the engine manual.
Count your real outings
A high cost per outing can mean a smaller boat, a shared boat or rentals would serve you better.
You Are Not Alone
States registered 11,674,073 recreational vessels in 2024, according to the U.S. Coast Guard's 2024 Recreational Boating Statistics report. Every one of those owners pays some mix of the six costs above.
Boat Cost FAQ
What does B.O.A.T. stand for?
It is an old boating joke: Bust Out Another Thousand. It refers to the steady stream of bills that follow the purchase of a boat.
Is the 10% rule accurate?
It is a rule of thumb, not a measured average, and no official body publishes it. It works best for boats in the tens of thousands of dollars. A cheap boat in an expensive marina can cost far more than 10% a year, and a new boat under warranty can cost less.
What is the biggest yearly cost of owning a boat?
For many owners it is the slip or storage, because those fees depend on boat length and location, not on what the boat cost. For a trailered boat kept at home, maintenance and fuel usually lead instead.