Boat Loan Calculator
Calculate the monthly payment for a boat or watercraft loan. Boat loans typically have longer terms (up to 20 years) and slightly higher rates than auto loans.
How to use the Boat Loan Calculator
- Enter your inputs into the Boat Loan Calculator above.
- Results update instantly as you type — no submit button needed.
- Adjust any value to see how the result changes in real time.
The boat loan payment formula
M = P · r(1 + r)^n / ((1 + r)^n − 1)
Standard fixed-payment amortization. Marine financing is treated like a hybrid auto/personal loan — secured by the boat, with terms commonly 10–20 years for larger vessels.
Worked example
A $50,000 boat loan at 8% APR over 15 years: M ≈ $478/month. Total paid: $85,985. Interest: about $35,985 — much higher than a similarly-priced auto loan due to the longer term.
Frequently asked questions
Can I deduct boat loan interest?
If the boat has sleeping, cooking and toilet facilities, it may qualify as a "second home" and the interest may be deductible — same rules as a second mortgage. Check with a tax professional.
Why are boat loan terms so long?
To keep monthly payments manageable on what is typically a discretionary purchase. The trade-off is much more total interest and a high chance of being underwater on the loan for several years.
Should I finance a boat?
Boats depreciate rapidly and have substantial maintenance costs. Many advisors suggest paying cash or financing only a portion — being upside-down on a boat loan can trap you when you want to sell.