Boat Loan Calculator
The monthly boat payment from price, rate, and term — plus what the whole loan costs by the last payment.
Boat loans are often 10–20 years. Include tax, registration, and gear in the amount if you are financing them.
This boat loan calculator returns the monthly payment, total interest, and total cost from the price financed, the rate, and the term. It is the same amortization as any fixed-rate loan — what differs is the term, which runs 10 to 20 years on boats where a car loan stops at 7.
Boat payment, boat loan, and boat finance are the same calculation, so all three queries land here. Below: what each term costs on a $40,000 boat, what the payment does not include, and why marine lending looks more like a mortgage than a car loan.
How to calculate a boat loan
- Enter the amount financed — price plus tax, registration, trailer, and gear if you are rolling them in.
- Enter the APR from the marine lender.
- Set the term. 10 to 15 years is typical above $25,000.
- $40,000 at 7.5% over 12 years: r = 0.00625 and n = 144, so the payment is $422.09.
- Total = 422.09 x 144 = $60,781, which means $20,781 of interest — 52% of the price.
- Put 20% down and finance $32,000 instead: same terms, $337.67 a month and $16,625 of interest.
Example
$40,000 at 7.5% for 12 years is $422.09 a month and $20,781 of interest. Shorten to 5 years and it becomes $801.52 with $8,091 of interest — $12,690 saved for $379 more a month. Drop the rate to 6.5% on the same 12-year term and the payment falls to $400.77, about $3,070 less interest over the life of the loan.
Boat loan payment formula
M = P x r(1+r)^n / ((1+r)^n - 1), with r = APR / 12 and n = years x 12. Total interest = M x n - P.
How to use this calculator
- Enter the boat price or the amount you are financing.
- Enter the APR from the marine lender — used boats usually price 1-2 points above new.
- Set the term. Years, not months.
- Read the payment, then check the total interest against the price. On long terms it is often half the boat.
- Re-run with a larger down payment to see what it saves.
What each term costs on $40,000 at 7.5%
The 20-year payment is 60% lower than the 5-year, and the interest is 4.6 times higher. Boats depreciate faster than the long terms amortize, which is exactly how owners end up owing more than the boat is worth.
| Term | Monthly payment | Total interest | Total repaid |
|---|---|---|---|
| 5 years | $801.52 | $8,091 | $48,091 |
| 10 years | $474.81 | $16,977 | $56,977 |
| 12 years | $422.09 | $20,781 | $60,781 |
| 15 years | $370.80 | $26,745 | $66,745 |
| 20 years | $322.24 | $37,337 | $77,337 |
The payment is not the cost of ownership
For most owners the loan payment is the smallest recurring cost.
Insurance runs about 1-2% of hull value a year, higher in hurricane zones. Storage is $100-600 a month wet or $50-150 dry. Maintenance runs 5-10% of the boat's value a year — engines, bottom paint, canvas, electronics. Fuel surprises first-time owners most, particularly on planing hulls.
A $422 payment on a boat that costs $600 a month to keep is a $1,000 a month hobby. The lender will not mention it, because it is not their loan.
Why boat loans are not car loans
- Term length — cars stop at 7 years, boats run 10-20 because the collateral is expected to hold value longer relative to price.
- Age limits — many lenders shorten the term as the model year ages, and some will not lend on a 20-year-old hull at all.
- Down payments — 10-20% is normal, more for older boats and first-time buyers.
- Surveys — above a certain size or age, lenders require a marine survey, typically $500-1,500, before funding.
Is the interest tax deductible?
Sometimes. If the boat has a galley, a berth, and a head, it can qualify as a second home, which makes the interest deductible like mortgage interest — subject to the same limits on acquisition debt. A small open boat does not qualify. Confirm with a tax adviser before counting on it.
How much should you put down?
Three reasons a larger down payment pays: it removes the negative-equity window, since boats lose 15-20% in year one and 10% down puts you underwater almost immediately; it changes the rate, because marine lenders price loan-to-value and below 80% usually earns the best tier; and it shortens the term you need at the same monthly payment.
On the $40,000 example, 20% down drops the 12-year payment to $337.67 and total interest to $16,625 — $4,156 less than financing the whole price.
Common mistakes
- Budgeting for the payment and not the slip, insurance, and maintenance.
- Taking a 20-year term on a boat that will be worth less than the balance by year four.
- Financing the trailer and electronics over 15 years — they wear out long before the loan is repaid.
- Skipping a $1,000 survey on a $40,000 purchase to save time.
FAQ
How much is a boat payment on $40,000?
At 7.5% for 12 years, $422 a month. Over 5 years it is $802; over 20 years, $322. A used boat usually prices 1-2 points higher.
What credit score do I need for a boat loan?
Most marine lenders want 680 or better, and the best rates go to 740+. Below 620, expect a personal loan or a much larger down payment.
How long can you finance a boat?
Up to 20 years on larger new boats, 10-15 on used, and shorter as the model year ages. Many lenders cap the term by boat age.
Is boat loan interest tax deductible?
Possibly. With a galley, berth, and head the boat can count as a second home, making the interest deductible like mortgage interest. Confirm with a tax adviser.
Boat loan or personal loan?
A boat loan is secured by the boat, so the rate is lower and the term longer. A personal loan is unsecured and usually capped at 7 years and smaller amounts.
How much should I put down on a boat?
10-20% is typical. 20% keeps you ahead of first-year depreciation and usually earns the best rate tier.
Do I need a survey for a boat loan?
Usually yes for used boats above a certain size or age. Budget $500-1,500 for it.
Can I refinance a boat loan?
Yes. It usually pays when the new rate is at least 1-1.5 points lower and more than five years remain on the loan.
Does a boat loan include tax and registration?
Only if you add them to the amount financed. Most lenders will include them up to the loan-to-value limit.