About the Boat Loan Calculator
This boat loan calculator estimates the monthly payment on a marine loan for a new or used boat, personal watercraft, pontoon or sailboat. Enter the purchase price, your down payment and any trade-in, the sales tax rate and dealer or registration fees, then the rate and term. It works out how much you will finance, the monthly payment, the total interest and the full cost of ownership of the loan.
Boat loans often run longer than car loans — terms of 10 to 20 years are common for larger boats — and lenders typically ask for 10% to 20% down. A longer term lowers the payment but can leave you owing more than the boat is worth as it depreciates, so the calculator shows how much interest each extra year costs.
Sales tax is applied to the price minus the trade-in, which is how many US states tax vehicle and vessel purchases; if your state taxes the full price, set the trade-in to zero and add its value to the down payment instead. Fees and tax are rolled into the loan, as is common at dealerships.
With the default inputs, the monthly payment is $516.00. Change any value above to recalculate instantly.
How to use the boat loan calculator
- 1Enter the boat’s price, your down payment and any trade-in.
- 2Enter your state sales tax rate and the dealer, title and registration fees.
- 3Enter the interest rate from your lender or dealer.
- 4Pick a loan term from 5 to 20 years.
- 5Review the monthly payment and total interest, then try a shorter term or bigger down payment.
Formula and method
Sales tax is calculated as (price − trade-in) × tax rate. The amount financed F adds tax and fees to the price and subtracts your down payment and trade-in. The monthly payment then uses the standard amortization formula with the monthly rate r (annual rate ÷ 12) and n = years × 12 payments.
Total cost is everything you pay for the boat through the loan: down payment, trade-in value and all monthly payments. It excludes insurance, storage, fuel and maintenance, which add significantly to the cost of owning a boat.
- F
- Amount financed
- M
- Monthly payment
- r
- Monthly interest rate (annual rate ÷ 12)
- n
- Number of monthly payments
Worked examples
$60,000 boat, $12,000 down, 8.5% for 15 years
Tax of $3,600 and $800 in fees are added to the $60,000 price and $12,000 is subtracted, so you finance $52,400. At 8.5% over 180 months the payment is about $516 and total interest is about $40,480.
$25,000 used boat with a trade-in, 7 years
Tax applies to $25,000 − $5,000 = $20,000, giving $1,400. Financing $18,800 at 9.5% for 84 months costs about $307 a month.
$150,000 cruiser over 20 years
With 20% down, no sales tax and $1,500 in fees, $121,500 is financed. A 20-year loan at 7.75% costs about $997 a month, and interest adds up to nearly the amount borrowed.
Frequently asked questions
How long can you finance a boat?+
Terms depend on the loan amount and the boat’s age. Smaller loans are often limited to 5–10 years, while loans of $50,000 or more on newer boats are commonly offered for 15 and sometimes 20 years.
How much down payment do I need for a boat?+
Most marine lenders look for 10% to 20% down. A larger down payment lowers the payment, may qualify you for a better rate and reduces the risk of owing more than the boat is worth.
Are boat loan rates higher than car loan rates?+
Often slightly, because boats are recreational purchases and depreciate. Rates vary with credit score, loan size, term and the boat’s age; larger loans on newer boats usually get the best rates.
Is boat loan interest tax deductible?+
In the US, interest on a boat loan may be deductible as mortgage interest if the loan is secured by the boat, the boat has sleeping, cooking and toilet facilities so it qualifies as your main or second home, and you itemize deductions. Check IRS Publication 936 or a tax professional.
What else should I budget for besides the loan?+
Insurance, storage or slip fees, winterization, maintenance, fuel, registration renewals and trailering costs. A common rule of thumb is to budget around 10% of the boat’s value per year for upkeep.
Results are estimates for educational purposes and are not financial advice. Rates, fees and terms vary — confirm with your lender or a licensed advisor before making decisions.