Boat Loan Calculator
Estimate the monthly payment, total interest and true cost of a secured fixed-rate boat loan. Adjust the boat price, down payment, interest rate and term to compare offers.
Monthly payment
£370.80
- Loan amount
- £40,000.00
- Down payment
- £10,000.00
- Down payment %
- 20%
- Total interest
- £26,744.89
- Total of payments
- £66,744.89
- Total cost (boat + interest)
- £76,744.89
A boat loan is a secured fixed-rate instalment loan repaid in equal monthly payments. The lender finances the boat price minus your down payment; the bigger the down payment, the less you borrow and the less interest you pay over the life of the loan. Terms are typically 5 to 20 years — longer terms shrink the monthly payment but can more than double the total interest cost.
How to use this calculator
Enter the boat price, the cash down payment you plan to put down, the annual interest rate quoted by the lender, and the term in months. The calculator works out the financed amount (price minus down payment), the fixed monthly payment, the total interest paid over the life of the loan, and the all-in cost once the boat itself is included.
How the calculation works
A boat loan is a secured fixed-rate amortising loan, so the monthly payment uses the same formula as a car loan or mortgage: P = L × r / (1 − (1+r)^−n), where L is the financed amount, r is the monthly rate (annual rate ÷ 12) and n is the number of months. Each payment is the same dollar amount; early payments are mostly interest and later payments are mostly principal. A larger down payment shrinks L and therefore both the monthly payment and the total interest. A longer term reduces the monthly payment but increases total interest, often dramatically.
Worked example
A 50,000 boat with a 10,000 down payment (20%) financed at 7.5% over 15 years (180 months) gives a loan amount of 40,000 and a monthly payment of about 370.80. Over the full term you pay back 66,744.89, of which 26,744.89 is interest. Total cost of ownership including the down payment is 76,744.89.
Frequently asked questions
How is a boat loan payment calculated?
A boat loan is a standard amortising loan, so the payment is calculated with the same formula as a car loan or mortgage: P = L × r / (1 − (1+r)^−n). L is the financed amount (boat price − down payment), r is the monthly interest rate (annual rate ÷ 12), and n is the total number of monthly payments. Every payment is the same size; early payments lean heavily on interest, later payments retire principal.
How much should I put down on a boat?
Most lenders ask for 10% to 20% down on a new boat and 15% to 25% on a used boat, though some marine lenders will go as low as 10% on well-qualified borrowers. A bigger down payment lowers your monthly payment, reduces total interest, and helps you avoid going underwater on the loan as the boat depreciates — boats lose value faster than cars in the first few years, so a thin down payment plus a long term is a common way to end up owing more than the boat is worth.
What is a typical boat loan term?
Boat loan terms typically run from 5 to 20 years, with 10 to 15 years being the most common for new boats over 25,000. Smaller used boats are usually financed over 3 to 7 years. Lenders set maximum terms based on the loan amount: roughly speaking, every 25,000 of financed amount earns you another 5 years of available term, capped at 20.
What interest rates are normal on a boat loan?
Boat loan rates are usually a couple of percentage points above auto loan rates because boats depreciate faster and the loans are longer. Well-qualified borrowers might see rates in the 6% to 8% range, with average credit landing 9% to 12% and subprime higher still. Marine-specialist lenders, credit unions and the dealer finance desk all price differently — get at least three quotes before signing.
Is a boat loan tax-deductible?
In the US, interest on a boat loan can be deductible as mortgage interest if the boat qualifies as a second home — meaning it has a sleeping berth, a galley and a head. The deduction is subject to the usual IRS rules on home mortgage interest and the per-taxpayer cap. This calculator does not model tax — speak to a tax professional for your specific situation.
Should I get pre-approved before shopping for a boat?
Yes. A pre-approval from a bank, credit union or marine lender tells you exactly how much you can borrow and at what rate, which lets you negotiate with the dealer from a position of strength. It also separates the financing decision from the boat decision so you do not get talked into a more expensive boat by an attractive monthly payment that hides a long term or high rate.