Boat Loan Payment Calculator
Estimate a boat loan payment with down payment, trade-in, sales tax and fees, or work out how much boat a monthly budget buys, with a full amortization schedule and term comparison.
How it works
Amount financed = price − rebate − down payment − (trade-in − amount owed) + financed tax and fees · Sales tax = tax rate × (price − trade-in) · Payment = P·r ÷ (1 − (1+r)^−n), r = APR ÷ 12, n = months · Total interest = payment × n − amount financed
A boat loan is a standard fixed-rate amortized loan: each level payment covers that month’s interest first, and the rest reduces the balance. The amount you borrow is the boat price minus your down payment, any rebate and any trade-in equity. If you owe more on the trade-in than it is worth, that gap is added to the loan. Sales tax is charged on the price, usually after subtracting the trade-in, and you can pay the tax and the title, registration and dealer fees upfront or add them to the loan. Switch to “Affordable price” to run the formula backwards: the calculator turns a monthly budget into the loan it supports and then into the boat price that loan covers after your down payment, tax and fees. Because boats lose value quickly and marine loans often stretch to 15 or 20 years, a long term keeps the payment low but adds a lot of interest; the term comparison table shows that trade-off side by side, and extra monthly payments show how much sooner you could be debt-free.
Worked example
On a $45,000 boat with $6,750 down (15%), you finance $38,250. At 8.5% over 15 years (180 payments), r = 0.085 ÷ 12 = 0.007083 and the payment is $376.66, so you repay $67,799.32 in total — $29,549.32 of it interest. Add 6% sales tax ($2,700) and $1,200 of fees to the loan and the amount financed becomes $42,150, raising the payment to $415.07. Paying $100 extra a month on the original loan clears it in exactly 10 years (120 payments instead of 180) and saves $11,054.62 of interest. Working backwards, a $400 monthly budget at 8.5% over 15 years supports a $40,620 loan, which with the same $6,750 down buys a boat of about $47,370.
Frequently asked questions
How much should I put down on a boat?
Marine lenders typically want 10% to 20% down. Enter it as a dollar amount or a percent of the price. A bigger down payment lowers the monthly payment, reduces total interest, and helps you avoid owing more than the boat is worth as it depreciates.
Should I roll the sales tax and fees into the loan?
Financing them saves cash today, but you pay interest on them for the whole term. Turn the two finance switches on and off to see the difference in the payment and total interest; the upfront payment shows how much cash you need at signing either way.
How does a trade-in change the loan?
Your trade-in value minus what you still owe on it is your equity, and it reduces the amount you borrow. In most states it also lowers the taxable price. If you owe more than the trade-in is worth, the shortfall is added to the new loan, and the calculator warns you.
How much boat can I afford for a given monthly payment?
Choose “Affordable price” and enter the payment you are comfortable with. The calculator works out the loan that payment repays at your rate and term, then adds back your down payment and trade-in and allows for tax and fees to give the highest boat price that fits.
Why are boat loans so long, and is a shorter term better?
Large boats are financed like homes, with terms of 15 to 20 years to keep payments affordable. The term comparison table shows the payment, total interest and total cost for 5, 10, 12, 15 and 20 years at your rate, so you can see how much a shorter term saves.
Does this include insurance and storage?
No. It covers the price, sales tax, the fees you enter and interest. Budget separately for marine insurance, slip or storage fees, winterization, fuel and maintenance, which together can rival the loan payment.
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Educational estimate, not financial advice. Actual loan terms, fees and taxes vary by lender.